On qcom SD host controllers voltage switching be done after the HW
is ready for it. The HW informs its readiness through power irq.
The voltage switching should happen only then.
So added support to register voltage regulators from the msm driver
and use them.
This patchset was posted long back but not actively pursued
https://lore.kernel.org/linux-arm-msm/[email protected]/
So posting it as fresh patchset.
Veerabhadrarao Badiganti (1):
dt-bindings: mmc: Supply max load for mmc supplies
Vijay Viswanath (2):
mmc: sdhci-msm: Use internal voltage control
mmc: sdhci: Allow platform controlled voltage switching
.../devicetree/bindings/mmc/mmc-controller.yaml | 16 ++
drivers/mmc/host/sdhci-msm.c | 215 ++++++++++++++++++++-
drivers/mmc/host/sdhci.c | 32 +--
drivers/mmc/host/sdhci.h | 1 +
4 files changed, 243 insertions(+), 21 deletions(-)
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
From: Vijay Viswanath <[email protected]>
On qcom SD host controllers voltage switching be done after the HW
is ready for it. The HW informs its readiness through power irq.
The voltage switching should happen only then.
Use the internal voltage switching and then control the voltage
switching using power irq.
Set the regulator load as well so that regulator can be configured
in LPM mode when in is not being used.
Signed-off-by: Asutosh Das <[email protected]>
Signed-off-by: Vijay Viswanath <[email protected]>
Signed-off-by: Veerabhadrarao Badiganti <[email protected]>
---
drivers/mmc/host/sdhci-msm.c | 215 +++++++++++++++++++++++++++++++++++++++++--
1 file changed, 207 insertions(+), 8 deletions(-)
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 97758fa..a10e955 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -36,7 +36,9 @@
#define CORE_PWRCTL_IO_LOW BIT(2)
#define CORE_PWRCTL_IO_HIGH BIT(3)
#define CORE_PWRCTL_BUS_SUCCESS BIT(0)
+#define CORE_PWRCTL_BUS_FAIL BIT(1)
#define CORE_PWRCTL_IO_SUCCESS BIT(2)
+#define CORE_PWRCTL_IO_FAIL BIT(3)
#define REQ_BUS_OFF BIT(0)
#define REQ_BUS_ON BIT(1)
#define REQ_IO_LOW BIT(2)
@@ -263,6 +265,9 @@ struct sdhci_msm_host {
bool use_cdr;
u32 transfer_mode;
bool updated_ddr_cfg;
+ u32 vmmc_load;
+ u32 vqmmc_load;
+ bool vqmmc_enabled;
};
static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host)
@@ -1298,6 +1303,78 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
sdhci_msm_hs400(host, &mmc->ios);
}
+static int sdhci_msm_set_vmmc(struct sdhci_msm_host *msm_host,
+ struct mmc_host *mmc, int level)
+{
+ int load, ret;
+
+ if (IS_ERR(mmc->supply.vmmc))
+ return 0;
+
+ if (msm_host->vmmc_load) {
+ load = level ? msm_host->vmmc_load : 0;
+ ret = regulator_set_load(mmc->supply.vmmc, load);
+ if (ret)
+ goto out;
+ }
+
+ ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, mmc->ios.vdd);
+out:
+ if (ret)
+ pr_err("%s: vmmc set load/ocr failed: %d\n",
+ mmc_hostname(mmc), ret);
+
+ return ret;
+}
+
+static int sdhci_msm_set_vqmmc(struct sdhci_msm_host *msm_host,
+ struct mmc_host *mmc, int level)
+{
+ int load, ret;
+ struct mmc_ios ios;
+
+ if (IS_ERR(mmc->supply.vqmmc) ||
+ (mmc->ios.power_mode == MMC_POWER_UNDEFINED) ||
+ (msm_host->vqmmc_enabled == level))
+ return 0;
+
+ if (msm_host->vqmmc_load) {
+ load = level ? msm_host->vqmmc_load : 0;
+ ret = regulator_set_load(mmc->supply.vqmmc, load);
+ if (ret)
+ goto out;
+ }
+
+ /*
+ * The IO voltage regulator may not always support a voltage close to
+ * vdd. Set IO voltage based on capability of the regulator.
+ */
+ if (level) {
+ if (msm_host->caps_0 & CORE_3_0V_SUPPORT)
+ ios.signal_voltage = MMC_SIGNAL_VOLTAGE_330;
+ else if (msm_host->caps_0 & CORE_1_8V_SUPPORT)
+ ios.signal_voltage = MMC_SIGNAL_VOLTAGE_180;
+ if (msm_host->caps_0 & CORE_VOLT_SUPPORT) {
+ pr_debug("%s: %s: setting signal voltage: %d\n",
+ mmc_hostname(mmc), __func__,
+ ios.signal_voltage);
+ ret = mmc_regulator_set_vqmmc(mmc, &ios);
+ if (ret < 0)
+ goto out;
+ }
+ ret = regulator_enable(mmc->supply.vqmmc);
+ } else {
+ ret = regulator_disable(mmc->supply.vqmmc);
+ }
+out:
+ if (ret)
+ pr_err("%s: vqmmc failed: %d\n", mmc_hostname(mmc), ret);
+ else
+ msm_host->vqmmc_enabled = level;
+
+ return ret;
+}
+
static inline void sdhci_msm_init_pwr_irq_wait(struct sdhci_msm_host *msm_host)
{
init_waitqueue_head(&msm_host->pwr_irq_wait);
@@ -1401,8 +1478,9 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+ struct mmc_host *mmc = host->mmc;
u32 irq_status, irq_ack = 0;
- int retry = 10;
+ int retry = 10, ret = 0;
u32 pwr_state = 0, io_level = 0;
u32 config;
const struct sdhci_msm_offset *msm_offset = msm_host->offset;
@@ -1438,14 +1516,35 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
/* Handle BUS ON/OFF*/
if (irq_status & CORE_PWRCTL_BUS_ON) {
- pwr_state = REQ_BUS_ON;
- io_level = REQ_IO_HIGH;
- irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
+ ret = sdhci_msm_set_vmmc(msm_host, mmc, 1);
+ if (!ret)
+ ret = sdhci_msm_set_vqmmc(msm_host, mmc, 1);
+
+ if (!ret) {
+ pwr_state = REQ_BUS_ON;
+ io_level = REQ_IO_HIGH;
+ irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
+ } else {
+ pr_err("%s: BUS_ON req failed(%d). irq_status: 0x%08x\n",
+ mmc_hostname(mmc), ret, irq_status);
+ irq_ack |= CORE_PWRCTL_BUS_FAIL;
+ sdhci_msm_set_vmmc(msm_host, mmc, 0);
+ }
}
if (irq_status & CORE_PWRCTL_BUS_OFF) {
- pwr_state = REQ_BUS_OFF;
- io_level = REQ_IO_LOW;
- irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
+ ret = sdhci_msm_set_vmmc(msm_host, mmc, 0);
+ if (!ret)
+ ret = sdhci_msm_set_vqmmc(msm_host, mmc, 0);
+
+ if (!ret) {
+ pwr_state = REQ_BUS_OFF;
+ io_level = REQ_IO_LOW;
+ irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
+ } else {
+ pr_err("%s: BUS_ON req failed(%d). irq_status: 0x%08x\n",
+ mmc_hostname(mmc), ret, irq_status);
+ irq_ack |= CORE_PWRCTL_BUS_FAIL;
+ }
}
/* Handle IO LOW/HIGH */
if (irq_status & CORE_PWRCTL_IO_LOW) {
@@ -1457,6 +1556,15 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
irq_ack |= CORE_PWRCTL_IO_SUCCESS;
}
+ if (io_level && !IS_ERR(mmc->supply.vqmmc) && !pwr_state) {
+ ret = mmc_regulator_set_vqmmc(mmc, &mmc->ios);
+ if (ret < 0)
+ pr_err("%s: IO_level setting failed(%d). signal_voltage: %d, vdd: %d irq_status: 0x%08x\n",
+ mmc_hostname(mmc), ret,
+ mmc->ios.signal_voltage, mmc->ios.vdd,
+ irq_status);
+ }
+
/*
* The driver has to acknowledge the interrupt, switch voltages and
* report back if it succeded or not to this register. The voltage
@@ -1833,6 +1941,91 @@ static void sdhci_msm_reset(struct sdhci_host *host, u8 mask)
sdhci_reset(host, mask);
}
+static int sdhci_msm_register_vreg(struct sdhci_msm_host *msm_host)
+{
+ int ret = 0;
+ struct mmc_host *mmc = msm_host->mmc;
+
+ ret = mmc_regulator_get_supply(msm_host->mmc);
+ if (ret)
+ return ret;
+ device_property_read_u32(&msm_host->pdev->dev,
+ "vmmc-max-load-microamp",
+ &msm_host->vmmc_load);
+ device_property_read_u32(&msm_host->pdev->dev,
+ "vqmmc-max-load-microamp",
+ &msm_host->vqmmc_load);
+
+ sdhci_msm_set_regulator_caps(msm_host);
+ mmc->ios.power_mode = MMC_POWER_UNDEFINED;
+
+ return 0;
+
+}
+
+static int sdhci_msm_start_signal_voltage_switch(struct mmc_host *mmc,
+ struct mmc_ios *ios)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+ u16 ctrl;
+
+ /*
+ * Signal Voltage Switching is only applicable for Host Controllers
+ * v3.00 and above.
+ */
+ if (host->version < SDHCI_SPEC_300)
+ return 0;
+
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+
+ switch (ios->signal_voltage) {
+ case MMC_SIGNAL_VOLTAGE_330:
+ if (!(host->flags & SDHCI_SIGNALING_330))
+ return -EINVAL;
+ /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
+ ctrl &= ~SDHCI_CTRL_VDD_180;
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+
+ /* 3.3V regulator output should be stable within 5 ms */
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ if (!(ctrl & SDHCI_CTRL_VDD_180))
+ return 0;
+
+ pr_warn("%s: 3.3V regulator output did not became stable\n",
+ mmc_hostname(mmc));
+
+ return -EAGAIN;
+ case MMC_SIGNAL_VOLTAGE_180:
+ if (!(host->flags & SDHCI_SIGNALING_180))
+ return -EINVAL;
+
+ /*
+ * Enable 1.8V Signal Enable in the Host Control2
+ * register
+ */
+ ctrl |= SDHCI_CTRL_VDD_180;
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+
+ /* 1.8V regulator output should be stable within 5 ms */
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ if (ctrl & SDHCI_CTRL_VDD_180)
+ return 0;
+
+ pr_warn("%s: 1.8V regulator output did not became stable\n",
+ mmc_hostname(mmc));
+
+ return -EAGAIN;
+ case MMC_SIGNAL_VOLTAGE_120:
+ if (!(host->flags & SDHCI_SIGNALING_120))
+ return -EINVAL;
+ return 0;
+ default:
+ /* No signal voltage switch required */
+ return 0;
+ }
+
+}
+
static const struct sdhci_msm_variant_ops mci_var_ops = {
.msm_readl_relaxed = sdhci_msm_mci_variant_readl_relaxed,
.msm_writel_relaxed = sdhci_msm_mci_variant_writel_relaxed,
@@ -1880,6 +2073,7 @@ static void sdhci_msm_reset(struct sdhci_host *host, u8 mask)
.write_w = sdhci_msm_writew,
.write_b = sdhci_msm_writeb,
.irq = sdhci_msm_cqe_irq,
+ .set_power = sdhci_set_power_noreg,
};
static const struct sdhci_pltfm_data sdhci_msm_pdata = {
@@ -2072,6 +2266,10 @@ static int sdhci_msm_probe(struct platform_device *pdev)
if (core_major == 1 && core_minor >= 0x49)
msm_host->updated_ddr_cfg = true;
+ ret = sdhci_msm_register_vreg(msm_host);
+ if (ret)
+ goto clk_disable;
+
/*
* Power on reset state may trigger power irq if previous status of
* PWRCTL was either BUS_ON or IO_HIGH_V. So before enabling pwr irq
@@ -2116,6 +2314,8 @@ static int sdhci_msm_probe(struct platform_device *pdev)
MSM_MMC_AUTOSUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(&pdev->dev);
+ host->mmc_host_ops.start_signal_voltage_switch =
+ sdhci_msm_start_signal_voltage_switch;
host->mmc_host_ops.execute_tuning = sdhci_msm_execute_tuning;
if (of_property_read_bool(node, "supports-cqe"))
ret = sdhci_msm_cqe_add_host(host, pdev);
@@ -2123,7 +2323,6 @@ static int sdhci_msm_probe(struct platform_device *pdev)
ret = sdhci_add_host(host);
if (ret)
goto pm_runtime_disable;
- sdhci_msm_set_regulator_caps(msm_host);
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
From: Vijay Viswanath <[email protected]>
If vendor platform drivers are controlling whole logic of voltage
switching, then sdhci driver no need control vqmmc regulator.
So skip enabling/disable vqmmc from SDHC driver.
Signed-off-by: Vijay Viswanath <[email protected]>
Signed-off-by: Veerabhadrarao Badiganti <[email protected]>
---
drivers/mmc/host/sdhci.c | 32 +++++++++++++++++++-------------
drivers/mmc/host/sdhci.h | 1 +
2 files changed, 20 insertions(+), 13 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 1bb6b67..c010823 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -4098,6 +4098,7 @@ int sdhci_setup_host(struct sdhci_host *host)
unsigned int override_timeout_clk;
u32 max_clk;
int ret;
+ bool enable_vqmmc = false;
WARN_ON(host == NULL);
if (host == NULL)
@@ -4111,9 +4112,12 @@ int sdhci_setup_host(struct sdhci_host *host)
* the host can take the appropriate action if regulators are not
* available.
*/
- ret = mmc_regulator_get_supply(mmc);
- if (ret)
- return ret;
+ if (!mmc->supply.vqmmc) {
+ ret = mmc_regulator_get_supply(mmc);
+ if (ret)
+ return ret;
+ enable_vqmmc = true;
+ }
DBG("Version: 0x%08x | Present: 0x%08x\n",
sdhci_readw(host, SDHCI_HOST_VERSION),
@@ -4373,7 +4377,15 @@ int sdhci_setup_host(struct sdhci_host *host)
mmc->caps |= MMC_CAP_NEEDS_POLL;
if (!IS_ERR(mmc->supply.vqmmc)) {
- ret = regulator_enable(mmc->supply.vqmmc);
+ if (enable_vqmmc) {
+ ret = regulator_enable(mmc->supply.vqmmc);
+ if (ret) {
+ pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
+ mmc_hostname(mmc), ret);
+ mmc->supply.vqmmc = ERR_PTR(-EINVAL);
+ }
+ host->vqmmc_enabled = !ret;
+ }
/* If vqmmc provides no 1.8V signalling, then there's no UHS */
if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
@@ -4386,12 +4398,6 @@ int sdhci_setup_host(struct sdhci_host *host)
if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000,
3600000))
host->flags &= ~SDHCI_SIGNALING_330;
-
- if (ret) {
- pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
- mmc_hostname(mmc), ret);
- mmc->supply.vqmmc = ERR_PTR(-EINVAL);
- }
}
if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
@@ -4625,7 +4631,7 @@ int sdhci_setup_host(struct sdhci_host *host)
return 0;
unreg:
- if (!IS_ERR(mmc->supply.vqmmc))
+ if (host->vqmmc_enabled)
regulator_disable(mmc->supply.vqmmc);
undma:
if (host->align_buffer)
@@ -4643,7 +4649,7 @@ void sdhci_cleanup_host(struct sdhci_host *host)
{
struct mmc_host *mmc = host->mmc;
- if (!IS_ERR(mmc->supply.vqmmc))
+ if (host->vqmmc_enabled)
regulator_disable(mmc->supply.vqmmc);
if (host->align_buffer)
@@ -4780,7 +4786,7 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
destroy_workqueue(host->complete_wq);
- if (!IS_ERR(mmc->supply.vqmmc))
+ if (host->vqmmc_enabled)
regulator_disable(mmc->supply.vqmmc);
if (host->align_buffer)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 8d2a096..24d27e1 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -570,6 +570,7 @@ struct sdhci_host {
u32 caps1; /* CAPABILITY_1 */
bool read_caps; /* Capability flags have been read */
+ bool vqmmc_enabled; /* Vqmmc is enabled */
unsigned int ocr_avail_sdio; /* OCR bit masks */
unsigned int ocr_avail_sd;
unsigned int ocr_avail_mmc;
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
Supply the max load needed for driving the mmc supplies.
Signed-off-by: Veerabhadrarao Badiganti <[email protected]>
---
.../devicetree/bindings/mmc/mmc-controller.yaml | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
index acc9f10..9058b82 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
+++ b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
@@ -290,6 +290,22 @@ properties:
description:
Supply for the bus IO line power
+ vmmc-max-load-microamp:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ - maximum: 1000000
+ description:
+ Maximum load for the card power.
+
+ vqmmc-max-load-microamp:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ - maximum: 1000000
+ description:
+ Maximum load for the bus IO line power.
+
mmc-pwrseq:
$ref: /schemas/types.yaml#/definitions/phandle
description:
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
On Fri 15 May 04:18 PDT 2020, Veerabhadrarao Badiganti wrote:
> From: Vijay Viswanath <[email protected]>
>
> On qcom SD host controllers voltage switching be done after the HW
> is ready for it. The HW informs its readiness through power irq.
> The voltage switching should happen only then.
>
> Use the internal voltage switching and then control the voltage
> switching using power irq.
>
> Set the regulator load as well so that regulator can be configured
> in LPM mode when in is not being used.
>
> Signed-off-by: Asutosh Das <[email protected]>
> Signed-off-by: Vijay Viswanath <[email protected]>
> Signed-off-by: Veerabhadrarao Badiganti <[email protected]>
Please note that per Documentation/process/submitting-patches.rst
section 11) this states:
1) You wrote the patch (From:) without stating that its Certificate of
origin.
2) Then Asutosh took your patch (in full or part) and guarantees that
he's allowed to contribute it to the project.
3) Then you took his patch (in full or part) and guarantee that you're
allowed to contribute it to the project.
4) Then Veerabhadrarao took your patch (in full or part) and guarantees
that he's allowed to contribute it to the project
5) Then somehow it came out of your inbox - even if Veerabhadrarao was
the one who handled it last.
As author you should be the first one to certify, and as poster to LKML
you should be the last one.
If you worked together on this, then list Asutosh and Veerabhadrarao as
Co-developed-by.
> ---
> drivers/mmc/host/sdhci-msm.c | 215 +++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 207 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 97758fa..a10e955 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -36,7 +36,9 @@
> #define CORE_PWRCTL_IO_LOW BIT(2)
> #define CORE_PWRCTL_IO_HIGH BIT(3)
> #define CORE_PWRCTL_BUS_SUCCESS BIT(0)
> +#define CORE_PWRCTL_BUS_FAIL BIT(1)
> #define CORE_PWRCTL_IO_SUCCESS BIT(2)
> +#define CORE_PWRCTL_IO_FAIL BIT(3)
> #define REQ_BUS_OFF BIT(0)
> #define REQ_BUS_ON BIT(1)
> #define REQ_IO_LOW BIT(2)
> @@ -263,6 +265,9 @@ struct sdhci_msm_host {
> bool use_cdr;
> u32 transfer_mode;
> bool updated_ddr_cfg;
> + u32 vmmc_load;
> + u32 vqmmc_load;
> + bool vqmmc_enabled;
> };
>
> static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host)
> @@ -1298,6 +1303,78 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
> sdhci_msm_hs400(host, &mmc->ios);
> }
>
> +static int sdhci_msm_set_vmmc(struct sdhci_msm_host *msm_host,
> + struct mmc_host *mmc, int level)
> +{
> + int load, ret;
> +
> + if (IS_ERR(mmc->supply.vmmc))
> + return 0;
> +
> + if (msm_host->vmmc_load) {
> + load = level ? msm_host->vmmc_load : 0;
> + ret = regulator_set_load(mmc->supply.vmmc, load);
I started on the comment about regulator_set_load() that you can find
below...
> + if (ret)
> + goto out;
> + }
> +
> + ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, mmc->ios.vdd);
...but I don't see that mmc->ios.vdd necessarily is in sync with
"level". Or do you here simply set the load based on what the hardware
tell you and then orthogonally to that let the core enable/disable the
regulator?
Perhaps I'm just missing something obvious, but if not I believe this
warrants a comment describing that you're lowering the power level
regardless of the actual power being disabled.
> +out:
> + if (ret)
> + pr_err("%s: vmmc set load/ocr failed: %d\n",
> + mmc_hostname(mmc), ret);
Please use:
dev_err(mmc_dev(mmc), ...);
> +
> + return ret;
> +}
> +
> +static int sdhci_msm_set_vqmmc(struct sdhci_msm_host *msm_host,
> + struct mmc_host *mmc, int level)
vqmmc_enabled is a bool and "level" sounds like an int with several
possible values. So please make level bool here as well, to make it
easer to read..
> +{
> + int load, ret;
> + struct mmc_ios ios;
> +
> + if (IS_ERR(mmc->supply.vqmmc) ||
> + (mmc->ios.power_mode == MMC_POWER_UNDEFINED) ||
> + (msm_host->vqmmc_enabled == level))
> + return 0;
> +
> + if (msm_host->vqmmc_load) {
> + load = level ? msm_host->vqmmc_load : 0;
> + ret = regulator_set_load(mmc->supply.vqmmc, load);
Since v5.0 the "load" of a regulator consumer is only taken into
consideration if the consumer is enabled. So given that you're toggling
the regulator below there's no need to change this here.
Just specify the "active load" at probe time.
> + if (ret)
> + goto out;
> + }
> +
> + /*
> + * The IO voltage regulator may not always support a voltage close to
> + * vdd. Set IO voltage based on capability of the regulator.
> + */
Is this comment related to the if/else-if inside the conditional? If so
please move it one line down.
> + if (level) {
> + if (msm_host->caps_0 & CORE_3_0V_SUPPORT)
> + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_330;
> + else if (msm_host->caps_0 & CORE_1_8V_SUPPORT)
> + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_180;
Please add a space here, to indicate that the if statement on the next
line is unrelated to the if/elseif above.
> + if (msm_host->caps_0 & CORE_VOLT_SUPPORT) {
> + pr_debug("%s: %s: setting signal voltage: %d\n",
> + mmc_hostname(mmc), __func__,
> + ios.signal_voltage);
I strongly believe you should replace these debug prints with
tracepoints, throughout the driver.
> + ret = mmc_regulator_set_vqmmc(mmc, &ios);
> + if (ret < 0)
> + goto out;
> + }
> + ret = regulator_enable(mmc->supply.vqmmc);
> + } else {
> + ret = regulator_disable(mmc->supply.vqmmc);
> + }
Given that you don't need to regulator_set_load() this function is now
just one large if/else condition on a constant passed as an argument.
Please split it into sdhci_msm_enable_vqmmc() and
sdhci_msm_disable_vqmmc().
> +out:
> + if (ret)
> + pr_err("%s: vqmmc failed: %d\n", mmc_hostname(mmc), ret);
I think it would be useful to know if this error came from
mmc_regulator_set_vqmmc() or regulator_enable() - or
regulator_disable().
So please move this up and add some context in the error message, and
please use dev_err().
> + else
> + msm_host->vqmmc_enabled = level;
> +
> + return ret;
> +}
> +
> static inline void sdhci_msm_init_pwr_irq_wait(struct sdhci_msm_host *msm_host)
> {
> init_waitqueue_head(&msm_host->pwr_irq_wait);
> @@ -1401,8 +1478,9 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
> {
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> + struct mmc_host *mmc = host->mmc;
> u32 irq_status, irq_ack = 0;
> - int retry = 10;
> + int retry = 10, ret = 0;
There's no need to initialize ret, in all occasions it's assigned before
being read.
> u32 pwr_state = 0, io_level = 0;
> u32 config;
> const struct sdhci_msm_offset *msm_offset = msm_host->offset;
> @@ -1438,14 +1516,35 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
>
> /* Handle BUS ON/OFF*/
> if (irq_status & CORE_PWRCTL_BUS_ON) {
> - pwr_state = REQ_BUS_ON;
> - io_level = REQ_IO_HIGH;
> - irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> + ret = sdhci_msm_set_vmmc(msm_host, mmc, 1);
> + if (!ret)
> + ret = sdhci_msm_set_vqmmc(msm_host, mmc, 1);
I find this quite complex to follow. Wouldn't it be cleaner to retain
the 4 checks on irq_status as they are and then before the writel of
irq_ack check pwr_state and io_level and call sdhci_msm_set_{vmmc,vqmmc}
accordingly?
> +
> + if (!ret) {
> + pwr_state = REQ_BUS_ON;
> + io_level = REQ_IO_HIGH;
> + irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> + } else {
> + pr_err("%s: BUS_ON req failed(%d). irq_status: 0x%08x\n",
> + mmc_hostname(mmc), ret, irq_status);
You already printed that this failed in sdhci_msm_set_{vmmc,vqmmc}, no
need to print again.
> + irq_ack |= CORE_PWRCTL_BUS_FAIL;
> + sdhci_msm_set_vmmc(msm_host, mmc, 0);
> + }
> }
> if (irq_status & CORE_PWRCTL_BUS_OFF) {
> - pwr_state = REQ_BUS_OFF;
> - io_level = REQ_IO_LOW;
> - irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> + ret = sdhci_msm_set_vmmc(msm_host, mmc, 0);
> + if (!ret)
> + ret = sdhci_msm_set_vqmmc(msm_host, mmc, 0);
> +
> + if (!ret) {
> + pwr_state = REQ_BUS_OFF;
> + io_level = REQ_IO_LOW;
> + irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> + } else {
> + pr_err("%s: BUS_ON req failed(%d). irq_status: 0x%08x\n",
> + mmc_hostname(mmc), ret, irq_status);
> + irq_ack |= CORE_PWRCTL_BUS_FAIL;
> + }
> }
> /* Handle IO LOW/HIGH */
> if (irq_status & CORE_PWRCTL_IO_LOW) {
> @@ -1457,6 +1556,15 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
> irq_ack |= CORE_PWRCTL_IO_SUCCESS;
> }
>
> + if (io_level && !IS_ERR(mmc->supply.vqmmc) && !pwr_state) {
> + ret = mmc_regulator_set_vqmmc(mmc, &mmc->ios);
Didn't you already call this through sdhci_msm_set_vqmmc()?
> + if (ret < 0)
> + pr_err("%s: IO_level setting failed(%d). signal_voltage: %d, vdd: %d irq_status: 0x%08x\n",
> + mmc_hostname(mmc), ret,
> + mmc->ios.signal_voltage, mmc->ios.vdd,
> + irq_status);
> + }
> +
> /*
> * The driver has to acknowledge the interrupt, switch voltages and
> * report back if it succeded or not to this register. The voltage
> @@ -1833,6 +1941,91 @@ static void sdhci_msm_reset(struct sdhci_host *host, u8 mask)
> sdhci_reset(host, mask);
> }
>
> +static int sdhci_msm_register_vreg(struct sdhci_msm_host *msm_host)
> +{
> + int ret = 0;
No need to initialize ret, first use is an assignment.
> + struct mmc_host *mmc = msm_host->mmc;
> +
> + ret = mmc_regulator_get_supply(msm_host->mmc);
> + if (ret)
> + return ret;
> + device_property_read_u32(&msm_host->pdev->dev,
> + "vmmc-max-load-microamp",
> + &msm_host->vmmc_load);
> + device_property_read_u32(&msm_host->pdev->dev,
> + "vqmmc-max-load-microamp",
> + &msm_host->vqmmc_load);
These properties are not documented. Do they vary enough to mandate
being read from DT or could they simply be approximated by a define
instead?
> +
> + sdhci_msm_set_regulator_caps(msm_host);
> + mmc->ios.power_mode = MMC_POWER_UNDEFINED;
> +
> + return 0;
> +
> +}
> +
> +static int sdhci_msm_start_signal_voltage_switch(struct mmc_host *mmc,
> + struct mmc_ios *ios)
> +{
> + struct sdhci_host *host = mmc_priv(mmc);
> + u16 ctrl;
> +
> + /*
> + * Signal Voltage Switching is only applicable for Host Controllers
> + * v3.00 and above.
> + */
> + if (host->version < SDHCI_SPEC_300)
> + return 0;
> +
> + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> +
> + switch (ios->signal_voltage) {
> + case MMC_SIGNAL_VOLTAGE_330:
> + if (!(host->flags & SDHCI_SIGNALING_330))
> + return -EINVAL;
> + /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
> + ctrl &= ~SDHCI_CTRL_VDD_180;
> + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
> +
> + /* 3.3V regulator output should be stable within 5 ms */
What mechanism ensures that the readw won't return withing 5ms from the
writew above?
> + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> + if (!(ctrl & SDHCI_CTRL_VDD_180))
> + return 0;
> +
> + pr_warn("%s: 3.3V regulator output did not became stable\n",
> + mmc_hostname(mmc));
> +
> + return -EAGAIN;
The body of the 330 and 180 cases are quite similar, can you perhaps
deal with those after the switch, once?
> + case MMC_SIGNAL_VOLTAGE_180:
> + if (!(host->flags & SDHCI_SIGNALING_180))
> + return -EINVAL;
> +
> + /*
> + * Enable 1.8V Signal Enable in the Host Control2
> + * register
> + */
> + ctrl |= SDHCI_CTRL_VDD_180;
> + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
> +
> + /* 1.8V regulator output should be stable within 5 ms */
> + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> + if (ctrl & SDHCI_CTRL_VDD_180)
> + return 0;
> +
> + pr_warn("%s: 1.8V regulator output did not became stable\n",
> + mmc_hostname(mmc));
> +
> + return -EAGAIN;
> + case MMC_SIGNAL_VOLTAGE_120:
> + if (!(host->flags & SDHCI_SIGNALING_120))
> + return -EINVAL;
> + return 0;
> + default:
> + /* No signal voltage switch required */
> + return 0;
> + }
> +
Empty line.
Regards,
Bjorn
> +}
> +
> static const struct sdhci_msm_variant_ops mci_var_ops = {
> .msm_readl_relaxed = sdhci_msm_mci_variant_readl_relaxed,
> .msm_writel_relaxed = sdhci_msm_mci_variant_writel_relaxed,
> @@ -1880,6 +2073,7 @@ static void sdhci_msm_reset(struct sdhci_host *host, u8 mask)
> .write_w = sdhci_msm_writew,
> .write_b = sdhci_msm_writeb,
> .irq = sdhci_msm_cqe_irq,
> + .set_power = sdhci_set_power_noreg,
> };
>
> static const struct sdhci_pltfm_data sdhci_msm_pdata = {
> @@ -2072,6 +2266,10 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> if (core_major == 1 && core_minor >= 0x49)
> msm_host->updated_ddr_cfg = true;
>
> + ret = sdhci_msm_register_vreg(msm_host);
> + if (ret)
> + goto clk_disable;
> +
> /*
> * Power on reset state may trigger power irq if previous status of
> * PWRCTL was either BUS_ON or IO_HIGH_V. So before enabling pwr irq
> @@ -2116,6 +2314,8 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> MSM_MMC_AUTOSUSPEND_DELAY_MS);
> pm_runtime_use_autosuspend(&pdev->dev);
>
> + host->mmc_host_ops.start_signal_voltage_switch =
> + sdhci_msm_start_signal_voltage_switch;
> host->mmc_host_ops.execute_tuning = sdhci_msm_execute_tuning;
> if (of_property_read_bool(node, "supports-cqe"))
> ret = sdhci_msm_cqe_add_host(host, pdev);
> @@ -2123,7 +2323,6 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> ret = sdhci_add_host(host);
> if (ret)
> goto pm_runtime_disable;
> - sdhci_msm_set_regulator_caps(msm_host);
>
> pm_runtime_mark_last_busy(&pdev->dev);
> pm_runtime_put_autosuspend(&pdev->dev);
> --
> Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
>
On Mon 18 May 12:57 PDT 2020, Bjorn Andersson wrote:
> On Fri 15 May 04:18 PDT 2020, Veerabhadrarao Badiganti wrote:
> > diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
[..]
> > +static int sdhci_msm_register_vreg(struct sdhci_msm_host *msm_host)
> > +{
> > + int ret = 0;
>
> No need to initialize ret, first use is an assignment.
>
> > + struct mmc_host *mmc = msm_host->mmc;
> > +
> > + ret = mmc_regulator_get_supply(msm_host->mmc);
> > + if (ret)
> > + return ret;
> > + device_property_read_u32(&msm_host->pdev->dev,
> > + "vmmc-max-load-microamp",
> > + &msm_host->vmmc_load);
> > + device_property_read_u32(&msm_host->pdev->dev,
> > + "vqmmc-max-load-microamp",
> > + &msm_host->vqmmc_load);
>
> These properties are not documented. Do they vary enough to mandate
> being read from DT or could they simply be approximated by a define
> instead?
>
Disregard my comment about them not being documented, I wasn't Cc'ed on
the binding patch and missed it.
My question about just defining them statically still stands.
Thanks,
Bjorn
On 15/05/20 2:18 pm, Veerabhadrarao Badiganti wrote:
> From: Vijay Viswanath <[email protected]>
>
> If vendor platform drivers are controlling whole logic of voltage
> switching, then sdhci driver no need control vqmmc regulator.
> So skip enabling/disable vqmmc from SDHC driver.
>
> Signed-off-by: Vijay Viswanath <[email protected]>
> Signed-off-by: Veerabhadrarao Badiganti <[email protected]>
> ---
> drivers/mmc/host/sdhci.c | 32 +++++++++++++++++++-------------
> drivers/mmc/host/sdhci.h | 1 +
> 2 files changed, 20 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 1bb6b67..c010823 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -4098,6 +4098,7 @@ int sdhci_setup_host(struct sdhci_host *host)
> unsigned int override_timeout_clk;
> u32 max_clk;
> int ret;
> + bool enable_vqmmc = false;
>
> WARN_ON(host == NULL);
> if (host == NULL)
> @@ -4111,9 +4112,12 @@ int sdhci_setup_host(struct sdhci_host *host)
> * the host can take the appropriate action if regulators are not
> * available.
> */
> - ret = mmc_regulator_get_supply(mmc);
> - if (ret)
> - return ret;
> + if (!mmc->supply.vqmmc) {
> + ret = mmc_regulator_get_supply(mmc);
> + if (ret)
> + return ret;
> + enable_vqmmc = true;
> + }
>
> DBG("Version: 0x%08x | Present: 0x%08x\n",
> sdhci_readw(host, SDHCI_HOST_VERSION),
> @@ -4373,7 +4377,15 @@ int sdhci_setup_host(struct sdhci_host *host)
> mmc->caps |= MMC_CAP_NEEDS_POLL;
>
> if (!IS_ERR(mmc->supply.vqmmc)) {
> - ret = regulator_enable(mmc->supply.vqmmc);
> + if (enable_vqmmc) {
> + ret = regulator_enable(mmc->supply.vqmmc);
> + if (ret) {
> + pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
> + mmc_hostname(mmc), ret);
> + mmc->supply.vqmmc = ERR_PTR(-EINVAL);
> + }
> + host->vqmmc_enabled = !ret;
> + }
>
> /* If vqmmc provides no 1.8V signalling, then there's no UHS */
> if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
> @@ -4386,12 +4398,6 @@ int sdhci_setup_host(struct sdhci_host *host)
> if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000,
> 3600000))
> host->flags &= ~SDHCI_SIGNALING_330;
> -
> - if (ret) {
> - pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
> - mmc_hostname(mmc), ret);
> - mmc->supply.vqmmc = ERR_PTR(-EINVAL);
> - }
> }
>
> if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
> @@ -4625,7 +4631,7 @@ int sdhci_setup_host(struct sdhci_host *host)
> return 0;
>
> unreg:
> - if (!IS_ERR(mmc->supply.vqmmc))
> + if (host->vqmmc_enabled)
> regulator_disable(mmc->supply.vqmmc);
> undma:
> if (host->align_buffer)
> @@ -4643,7 +4649,7 @@ void sdhci_cleanup_host(struct sdhci_host *host)
> {
> struct mmc_host *mmc = host->mmc;
>
> - if (!IS_ERR(mmc->supply.vqmmc))
> + if (host->vqmmc_enabled)
> regulator_disable(mmc->supply.vqmmc);
>
> if (host->align_buffer)
> @@ -4780,7 +4786,7 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
>
> destroy_workqueue(host->complete_wq);
>
> - if (!IS_ERR(mmc->supply.vqmmc))
> + if (host->vqmmc_enabled)
> regulator_disable(mmc->supply.vqmmc);
>
> if (host->align_buffer)
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 8d2a096..24d27e1 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -570,6 +570,7 @@ struct sdhci_host {
> u32 caps1; /* CAPABILITY_1 */
> bool read_caps; /* Capability flags have been read */
>
> + bool vqmmc_enabled; /* Vqmmc is enabled */
Last time around there was dissatisfaction with this variable name. Perhaps
change it to sdhci_core_to_disable_vqmmc
> unsigned int ocr_avail_sdio; /* OCR bit masks */
> unsigned int ocr_avail_sd;
> unsigned int ocr_avail_mmc;
>
Thanks Bjorn for the review. For major comments I'm responding.
Other comments, i will take care of them in my next patch-set.
On 5/19/2020 1:27 AM, Bjorn Andersson wrote:
> On Fri 15 May 04:18 PDT 2020, Veerabhadrarao Badiganti wrote:
>
>> From: Vijay Viswanath <[email protected]>
>>
>> On qcom SD host controllers voltage switching be done after the HW
>> is ready for it. The HW informs its readiness through power irq.
>> The voltage switching should happen only then.
>>
>> Use the internal voltage switching and then control the voltage
>> switching using power irq.
>>
>> Set the regulator load as well so that regulator can be configured
>> in LPM mode when in is not being used.
>>
>> Signed-off-by: Asutosh Das <[email protected]>
>> Signed-off-by: Vijay Viswanath <[email protected]>
>> Signed-off-by: Veerabhadrarao Badiganti <[email protected]>
> Please note that per Documentation/process/submitting-patches.rst
> section 11) this states:
>
> 1) You wrote the patch (From:) without stating that its Certificate of
> origin.
>
> 2) Then Asutosh took your patch (in full or part) and guarantees that
> he's allowed to contribute it to the project.
>
> 3) Then you took his patch (in full or part) and guarantee that you're
> allowed to contribute it to the project.
>
> 4) Then Veerabhadrarao took your patch (in full or part) and guarantees
> that he's allowed to contribute it to the project
>
> 5) Then somehow it came out of your inbox - even if Veerabhadrarao was
> the one who handled it last.
>
>
> As author you should be the first one to certify, and as poster to LKML
> you should be the last one.
>
> If you worked together on this, then list Asutosh and Veerabhadrarao as
> Co-developed-by.
>
>> ---
>> drivers/mmc/host/sdhci-msm.c | 215 +++++++++++++++++++++++++++++++++++++++++--
>> 1 file changed, 207 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
>> index 97758fa..a10e955 100644
>> --- a/drivers/mmc/host/sdhci-msm.c
>> +++ b/drivers/mmc/host/sdhci-msm.c
>> @@ -36,7 +36,9 @@
>> #define CORE_PWRCTL_IO_LOW BIT(2)
>> #define CORE_PWRCTL_IO_HIGH BIT(3)
>> #define CORE_PWRCTL_BUS_SUCCESS BIT(0)
>> +#define CORE_PWRCTL_BUS_FAIL BIT(1)
>> #define CORE_PWRCTL_IO_SUCCESS BIT(2)
>> +#define CORE_PWRCTL_IO_FAIL BIT(3)
>> #define REQ_BUS_OFF BIT(0)
>> #define REQ_BUS_ON BIT(1)
>> #define REQ_IO_LOW BIT(2)
>> @@ -263,6 +265,9 @@ struct sdhci_msm_host {
>> bool use_cdr;
>> u32 transfer_mode;
>> bool updated_ddr_cfg;
>> + u32 vmmc_load;
>> + u32 vqmmc_load;
>> + bool vqmmc_enabled;
>> };
>>
>> static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host)
>> @@ -1298,6 +1303,78 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
>> sdhci_msm_hs400(host, &mmc->ios);
>> }
>>
>> +static int sdhci_msm_set_vmmc(struct sdhci_msm_host *msm_host,
>> + struct mmc_host *mmc, int level)
>> +{
>> + int load, ret;
>> +
>> + if (IS_ERR(mmc->supply.vmmc))
>> + return 0;
>> +
>> + if (msm_host->vmmc_load) {
>> + load = level ? msm_host->vmmc_load : 0;
>> + ret = regulator_set_load(mmc->supply.vmmc, load);
> I started on the comment about regulator_set_load() that you can find
> below...
>
>> + if (ret)
>> + goto out;
>> + }
>> +
>> + ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, mmc->ios.vdd);
> ...but I don't see that mmc->ios.vdd necessarily is in sync with
> "level". Or do you here simply set the load based on what the hardware
> tell you and then orthogonally to that let the core enable/disable the
> regulator?
>
> Perhaps I'm just missing something obvious, but if not I believe this
> warrants a comment describing that you're lowering the power level
> regardless of the actual power being disabled.
ios.vdd will be in sync with level. Vdd will be either 0 or a valid
voltage (3v).
This indirectly gets triggered/invoked through power-irq when driver
writes 0
or valid voltage to SDHCI_POWER_CONTROL register from
sdhci_set_power_noreg().
>> +out:
>> + if (ret)
>> + pr_err("%s: vmmc set load/ocr failed: %d\n",
>> + mmc_hostname(mmc), ret);
> Please use:
> dev_err(mmc_dev(mmc), ...);
>
>> +
>> + return ret;
>> +}
>> +
>> +static int sdhci_msm_set_vqmmc(struct sdhci_msm_host *msm_host,
>> + struct mmc_host *mmc, int level)
> vqmmc_enabled is a bool and "level" sounds like an int with several
> possible values. So please make level bool here as well, to make it
> easer to read..
>
>> +{
>> + int load, ret;
>> + struct mmc_ios ios;
>> +
>> + if (IS_ERR(mmc->supply.vqmmc) ||
>> + (mmc->ios.power_mode == MMC_POWER_UNDEFINED) ||
>> + (msm_host->vqmmc_enabled == level))
>> + return 0;
>> +
>> + if (msm_host->vqmmc_load) {
>> + load = level ? msm_host->vqmmc_load : 0;
>> + ret = regulator_set_load(mmc->supply.vqmmc, load);
> Since v5.0 the "load" of a regulator consumer is only taken into
> consideration if the consumer is enabled. So given that you're toggling
> the regulator below there's no need to change this here.
>
> Just specify the "active load" at probe time.
For eMMC case, we don't disable this Vccq2 regulator by having always-on
flag
in the regulator node. Only for SDcard Vccq2 will be disabled.
Sice driver is common for both eMMC and SDcard, I have to set 0 load to make
it generic and to ensure eMMC Vccq2 regulator will be in LPM mode.
>
>> + if (ret)
>> + goto out;
>> + }
>> +
>> + /*
>> + * The IO voltage regulator may not always support a voltage close to
>> + * vdd. Set IO voltage based on capability of the regulator.
>> + */
> Is this comment related to the if/else-if inside the conditional? If so
> please move it one line down.
>
>> + if (level) {
>> + if (msm_host->caps_0 & CORE_3_0V_SUPPORT)
>> + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_330;
>> + else if (msm_host->caps_0 & CORE_1_8V_SUPPORT)
>> + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_180;
> Please add a space here, to indicate that the if statement on the next
> line is unrelated to the if/elseif above.
>
>> + if (msm_host->caps_0 & CORE_VOLT_SUPPORT) {
>> + pr_debug("%s: %s: setting signal voltage: %d\n",
>> + mmc_hostname(mmc), __func__,
>> + ios.signal_voltage);
> I strongly believe you should replace these debug prints with
> tracepoints, throughout the driver.
>
>> + ret = mmc_regulator_set_vqmmc(mmc, &ios);
>> + if (ret < 0)
>> + goto out;
>> + }
>> + ret = regulator_enable(mmc->supply.vqmmc);
>> + } else {
>> + ret = regulator_disable(mmc->supply.vqmmc);
>> + }
> Given that you don't need to regulator_set_load() this function is now
> just one large if/else condition on a constant passed as an argument.
> Please split it into sdhci_msm_enable_vqmmc() and
> sdhci_msm_disable_vqmmc().
Same response as above
For eMMC case, we don't disable this Vccq2 regulator by having always-on
flag
in the regulator node. Only for SDcard Vccq2 will be disabled.
Sice driver is common for both eMMC and SDcard, I have to set 0 load to make
it generic and to ensure eMMC Vccq2 regulator will be in LPM mode.
>> +out:
>> + if (ret)
>> + pr_err("%s: vqmmc failed: %d\n", mmc_hostname(mmc), ret);
> I think it would be useful to know if this error came from
> mmc_regulator_set_vqmmc() or regulator_enable() - or
> regulator_disable().
>
> So please move this up and add some context in the error message, and
> please use dev_err().
>
>> + else
>> + msm_host->vqmmc_enabled = level;
>> +
>> + return ret;
>> +}
>> +
>> static inline void sdhci_msm_init_pwr_irq_wait(struct sdhci_msm_host *msm_host)
>> {
>> init_waitqueue_head(&msm_host->pwr_irq_wait);
>> @@ -1401,8 +1478,9 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
>> {
>> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
>> + struct mmc_host *mmc = host->mmc;
>> u32 irq_status, irq_ack = 0;
>> - int retry = 10;
>> + int retry = 10, ret = 0;
> There's no need to initialize ret, in all occasions it's assigned before
> being read.
>
>> u32 pwr_state = 0, io_level = 0;
>> u32 config;
>> const struct sdhci_msm_offset *msm_offset = msm_host->offset;
>> @@ -1438,14 +1516,35 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
>>
>> /* Handle BUS ON/OFF*/
>> if (irq_status & CORE_PWRCTL_BUS_ON) {
>> - pwr_state = REQ_BUS_ON;
>> - io_level = REQ_IO_HIGH;
>> - irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
>> + ret = sdhci_msm_set_vmmc(msm_host, mmc, 1);
>> + if (!ret)
>> + ret = sdhci_msm_set_vqmmc(msm_host, mmc, 1);
> I find this quite complex to follow. Wouldn't it be cleaner to retain
> the 4 checks on irq_status as they are and then before the writel of
> irq_ack check pwr_state and io_level and call sdhci_msm_set_{vmmc,vqmmc}
> accordingly?
I will see if i can update as you suggested.
>> +
>> + if (!ret) {
>> + pwr_state = REQ_BUS_ON;
>> + io_level = REQ_IO_HIGH;
>> + irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
>> + } else {
>> + pr_err("%s: BUS_ON req failed(%d). irq_status: 0x%08x\n",
>> + mmc_hostname(mmc), ret, irq_status);
> You already printed that this failed in sdhci_msm_set_{vmmc,vqmmc}, no
> need to print again.
>
>> + irq_ack |= CORE_PWRCTL_BUS_FAIL;
>> + sdhci_msm_set_vmmc(msm_host, mmc, 0);
>> + }
>> }
>> if (irq_status & CORE_PWRCTL_BUS_OFF) {
>> - pwr_state = REQ_BUS_OFF;
>> - io_level = REQ_IO_LOW;
>> - irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
>> + ret = sdhci_msm_set_vmmc(msm_host, mmc, 0);
>> + if (!ret)
>> + ret = sdhci_msm_set_vqmmc(msm_host, mmc, 0);
>> +
>> + if (!ret) {
>> + pwr_state = REQ_BUS_OFF;
>> + io_level = REQ_IO_LOW;
>> + irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
>> + } else {
>> + pr_err("%s: BUS_ON req failed(%d). irq_status: 0x%08x\n",
>> + mmc_hostname(mmc), ret, irq_status);
>> + irq_ack |= CORE_PWRCTL_BUS_FAIL;
>> + }
>> }
>> /* Handle IO LOW/HIGH */
>> if (irq_status & CORE_PWRCTL_IO_LOW) {
>> @@ -1457,6 +1556,15 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
>> irq_ack |= CORE_PWRCTL_IO_SUCCESS;
>> }
>>
>> + if (io_level && !IS_ERR(mmc->supply.vqmmc) && !pwr_state) {
>> + ret = mmc_regulator_set_vqmmc(mmc, &mmc->ios);
> Didn't you already call this through sdhci_msm_set_vqmmc()?
No.sdhci_msm_set_vqmmc handles only vqmmc ON/OFF. While turning it ON it
sets
Vqmmc to possbile default IO level (1.8v or 3.0v).
Where this is only to make IO lines high (3.0v) or Low (1.8v).
>> + if (ret < 0)
>> + pr_err("%s: IO_level setting failed(%d). signal_voltage: %d, vdd: %d irq_status: 0x%08x\n",
>> + mmc_hostname(mmc), ret,
>> + mmc->ios.signal_voltage, mmc->ios.vdd,
>> + irq_status);
>> + }
>> +
>> /*
>> * The driver has to acknowledge the interrupt, switch voltages and
>> * report back if it succeded or not to this register. The voltage
>> @@ -1833,6 +1941,91 @@ static void sdhci_msm_reset(struct sdhci_host *host, u8 mask)
>> sdhci_reset(host, mask);
>> }
>>
>> +static int sdhci_msm_register_vreg(struct sdhci_msm_host *msm_host)
>> +{
>> + int ret = 0;
> No need to initialize ret, first use is an assignment.
>
>> + struct mmc_host *mmc = msm_host->mmc;
>> +
>> + ret = mmc_regulator_get_supply(msm_host->mmc);
>> + if (ret)
>> + return ret;
>> + device_property_read_u32(&msm_host->pdev->dev,
>> + "vmmc-max-load-microamp",
>> + &msm_host->vmmc_load);
>> + device_property_read_u32(&msm_host->pdev->dev,
>> + "vqmmc-max-load-microamp",
>> + &msm_host->vqmmc_load);
> These properties are not documented. Do they vary enough to mandate
> being read from DT or could they simply be approximated by a define
> instead?
I can use defines. But since these values are different for eMMC and SDcard
I will have to maintain two sets and need to have logic during probe to
identify SDcard or eMMC and use the assign the set accordingly.
So we tought, getting from dt is simpler and clean.
In case Rob didn't agree with dt entries, I will go with this approach.
>> +
>> + sdhci_msm_set_regulator_caps(msm_host);
>> + mmc->ios.power_mode = MMC_POWER_UNDEFINED;
>> +
>> + return 0;
>> +
>> +}
>> +
>> +static int sdhci_msm_start_signal_voltage_switch(struct mmc_host *mmc,
>> + struct mmc_ios *ios)
>> +{
>> + struct sdhci_host *host = mmc_priv(mmc);
>> + u16 ctrl;
>> +
>> + /*
>> + * Signal Voltage Switching is only applicable for Host Controllers
>> + * v3.00 and above.
>> + */
>> + if (host->version < SDHCI_SPEC_300)
>> + return 0;
>> +
>> + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
>> +
>> + switch (ios->signal_voltage) {
>> + case MMC_SIGNAL_VOLTAGE_330:
>> + if (!(host->flags & SDHCI_SIGNALING_330))
>> + return -EINVAL;
>> + /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
>> + ctrl &= ~SDHCI_CTRL_VDD_180;
>> + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
>> +
>> + /* 3.3V regulator output should be stable within 5 ms */
> What mechanism ensures that the readw won't return withing 5ms from the
> writew above?
Thanks for pointing this. This delay got missed. I will add it in next
patchset.
>> + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
>> + if (!(ctrl & SDHCI_CTRL_VDD_180))
>> + return 0;
>> +
>> + pr_warn("%s: 3.3V regulator output did not became stable\n",
>> + mmc_hostname(mmc));
>> +
>> + return -EAGAIN;
> The body of the 330 and 180 cases are quite similar, can you perhaps
> deal with those after the switch, once?
Sure. Will check this.
>> + case MMC_SIGNAL_VOLTAGE_180:
>> + if (!(host->flags & SDHCI_SIGNALING_180))
>> + return -EINVAL;
>> +
>> + /*
>> + * Enable 1.8V Signal Enable in the Host Control2
>> + * register
>> + */
>> + ctrl |= SDHCI_CTRL_VDD_180;
>> + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
>> +
>> + /* 1.8V regulator output should be stable within 5 ms */
>> + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
>> + if (ctrl & SDHCI_CTRL_VDD_180)
>> + return 0;
>> +
>> + pr_warn("%s: 1.8V regulator output did not became stable\n",
>> + mmc_hostname(mmc));
>> +
>> + return -EAGAIN;
>> + case MMC_SIGNAL_VOLTAGE_120:
>> + if (!(host->flags & SDHCI_SIGNALING_120))
>> + return -EINVAL;
>> + return 0;
>> + default:
>> + /* No signal voltage switch required */
>> + return 0;
>> + }
>> +
> Empty line.
>
> Regards,
> Bjorn
>
>> +}
>> +
>> static const struct sdhci_msm_variant_ops mci_var_ops = {
>> .msm_readl_relaxed = sdhci_msm_mci_variant_readl_relaxed,
>> .msm_writel_relaxed = sdhci_msm_mci_variant_writel_relaxed,
>> @@ -1880,6 +2073,7 @@ static void sdhci_msm_reset(struct sdhci_host *host, u8 mask)
>> .write_w = sdhci_msm_writew,
>> .write_b = sdhci_msm_writeb,
>> .irq = sdhci_msm_cqe_irq,
>> + .set_power = sdhci_set_power_noreg,
>> };
>>
>> static const struct sdhci_pltfm_data sdhci_msm_pdata = {
>> @@ -2072,6 +2266,10 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>> if (core_major == 1 && core_minor >= 0x49)
>> msm_host->updated_ddr_cfg = true;
>>
>> + ret = sdhci_msm_register_vreg(msm_host);
>> + if (ret)
>> + goto clk_disable;
>> +
>> /*
>> * Power on reset state may trigger power irq if previous status of
>> * PWRCTL was either BUS_ON or IO_HIGH_V. So before enabling pwr irq
>> @@ -2116,6 +2314,8 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>> MSM_MMC_AUTOSUSPEND_DELAY_MS);
>> pm_runtime_use_autosuspend(&pdev->dev);
>>
>> + host->mmc_host_ops.start_signal_voltage_switch =
>> + sdhci_msm_start_signal_voltage_switch;
>> host->mmc_host_ops.execute_tuning = sdhci_msm_execute_tuning;
>> if (of_property_read_bool(node, "supports-cqe"))
>> ret = sdhci_msm_cqe_add_host(host, pdev);
>> @@ -2123,7 +2323,6 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>> ret = sdhci_add_host(host);
>> if (ret)
>> goto pm_runtime_disable;
>> - sdhci_msm_set_regulator_caps(msm_host);
>>
>> pm_runtime_mark_last_busy(&pdev->dev);
>> pm_runtime_put_autosuspend(&pdev->dev);
>> --
>> Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
>>
On 5/19/2020 11:36 AM, Adrian Hunter wrote:
> On 15/05/20 2:18 pm, Veerabhadrarao Badiganti wrote:
>> From: Vijay Viswanath <[email protected]>
>>
>> If vendor platform drivers are controlling whole logic of voltage
>> switching, then sdhci driver no need control vqmmc regulator.
>> So skip enabling/disable vqmmc from SDHC driver.
>>
>> Signed-off-by: Vijay Viswanath <[email protected]>
>> Signed-off-by: Veerabhadrarao Badiganti <[email protected]>
>> ---
>> drivers/mmc/host/sdhci.c | 32 +++++++++++++++++++-------------
>> drivers/mmc/host/sdhci.h | 1 +
>> 2 files changed, 20 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> index 1bb6b67..c010823 100644
>> --- a/drivers/mmc/host/sdhci.c
>> +++ b/drivers/mmc/host/sdhci.c
>> @@ -4098,6 +4098,7 @@ int sdhci_setup_host(struct sdhci_host *host)
>> unsigned int override_timeout_clk;
>> u32 max_clk;
>> int ret;
>> + bool enable_vqmmc = false;
>>
>> WARN_ON(host == NULL);
>> if (host == NULL)
>> @@ -4111,9 +4112,12 @@ int sdhci_setup_host(struct sdhci_host *host)
>> * the host can take the appropriate action if regulators are not
>> * available.
>> */
>> - ret = mmc_regulator_get_supply(mmc);
>> - if (ret)
>> - return ret;
>> + if (!mmc->supply.vqmmc) {
>> + ret = mmc_regulator_get_supply(mmc);
>> + if (ret)
>> + return ret;
>> + enable_vqmmc = true;
>> + }
>>
>> DBG("Version: 0x%08x | Present: 0x%08x\n",
>> sdhci_readw(host, SDHCI_HOST_VERSION),
>> @@ -4373,7 +4377,15 @@ int sdhci_setup_host(struct sdhci_host *host)
>> mmc->caps |= MMC_CAP_NEEDS_POLL;
>>
>> if (!IS_ERR(mmc->supply.vqmmc)) {
>> - ret = regulator_enable(mmc->supply.vqmmc);
>> + if (enable_vqmmc) {
>> + ret = regulator_enable(mmc->supply.vqmmc);
>> + if (ret) {
>> + pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
>> + mmc_hostname(mmc), ret);
>> + mmc->supply.vqmmc = ERR_PTR(-EINVAL);
>> + }
>> + host->vqmmc_enabled = !ret;
>> + }
>>
>> /* If vqmmc provides no 1.8V signalling, then there's no UHS */
>> if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
>> @@ -4386,12 +4398,6 @@ int sdhci_setup_host(struct sdhci_host *host)
>> if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000,
>> 3600000))
>> host->flags &= ~SDHCI_SIGNALING_330;
>> -
>> - if (ret) {
>> - pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
>> - mmc_hostname(mmc), ret);
>> - mmc->supply.vqmmc = ERR_PTR(-EINVAL);
>> - }
>> }
>>
>> if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
>> @@ -4625,7 +4631,7 @@ int sdhci_setup_host(struct sdhci_host *host)
>> return 0;
>>
>> unreg:
>> - if (!IS_ERR(mmc->supply.vqmmc))
>> + if (host->vqmmc_enabled)
>> regulator_disable(mmc->supply.vqmmc);
>> undma:
>> if (host->align_buffer)
>> @@ -4643,7 +4649,7 @@ void sdhci_cleanup_host(struct sdhci_host *host)
>> {
>> struct mmc_host *mmc = host->mmc;
>>
>> - if (!IS_ERR(mmc->supply.vqmmc))
>> + if (host->vqmmc_enabled)
>> regulator_disable(mmc->supply.vqmmc);
>>
>> if (host->align_buffer)
>> @@ -4780,7 +4786,7 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
>>
>> destroy_workqueue(host->complete_wq);
>>
>> - if (!IS_ERR(mmc->supply.vqmmc))
>> + if (host->vqmmc_enabled)
>> regulator_disable(mmc->supply.vqmmc);
>>
>> if (host->align_buffer)
>> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
>> index 8d2a096..24d27e1 100644
>> --- a/drivers/mmc/host/sdhci.h
>> +++ b/drivers/mmc/host/sdhci.h
>> @@ -570,6 +570,7 @@ struct sdhci_host {
>> u32 caps1; /* CAPABILITY_1 */
>> bool read_caps; /* Capability flags have been read */
>>
>> + bool vqmmc_enabled; /* Vqmmc is enabled */
> Last time around there was dissatisfaction with this variable name. Perhaps
> change it to sdhci_core_to_disable_vqmmc
Sure Adrian. Will update this variable name.
>
>> unsigned int ocr_avail_sdio; /* OCR bit masks */
>> unsigned int ocr_avail_sd;
>> unsigned int ocr_avail_mmc;
>>
On qcom SD host controllers voltage switching be done after the HW
is ready for it. The HW informs its readiness through power irq.
The voltage switching should happen only then.
So added support to register voltage regulators from the msm driver
and use them.
This patchset was posted long back but not actively pursued
https://lore.kernel.org/linux-arm-msm/[email protected]/
So posting it as fresh patchset.
Changes since V1:
- Removed setting load for Vmmc regulator while turning it on/off.
Instead setting the active load once during probe.
- Simplified handlng of supplies for BUS_ON/OFF cases in shci_msm_handle_pwr_irq().
- Moved common code out of switch case in sdhci_msm_start_signal_voltage_switch().
- Updated variable name to sdhci_core_to_disable_vqmmc.
- Updated pr_err logs to dev_err logs.
Veerabhadrarao Badiganti (1):
dt-bindings: mmc: Supply max load for mmc supplies
mmc: sdhci-msm: Use internal voltage control
Vijay Viswanath (1):
mmc: sdhci: Allow platform controlled voltage switching
.../devicetree/bindings/mmc/mmc-controller.yaml | 16 ++
drivers/mmc/host/sdhci-msm.c | 207 ++++++++++++++++++++-
drivers/mmc/host/sdhci.c | 32 ++--
drivers/mmc/host/sdhci.h | 1 +
4 files changed, 234 insertions(+), 22 deletions(-)
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
On Wed 20 May 04:16 PDT 2020, Veerabhadrarao Badiganti wrote:
>
> Thanks Bjorn for the review. For major comments I'm responding.
> Other comments, i will take care of them in my next patch-set.
>
> On 5/19/2020 1:27 AM, Bjorn Andersson wrote:
> > On Fri 15 May 04:18 PDT 2020, Veerabhadrarao Badiganti wrote:
[..]
> > > diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
[..]
> > > +static int sdhci_msm_set_vmmc(struct sdhci_msm_host *msm_host,
> > > + struct mmc_host *mmc, int level)
> > > +{
> > > + int load, ret;
> > > +
> > > + if (IS_ERR(mmc->supply.vmmc))
> > > + return 0;
> > > +
> > > + if (msm_host->vmmc_load) {
> > > + load = level ? msm_host->vmmc_load : 0;
> > > + ret = regulator_set_load(mmc->supply.vmmc, load);
> > I started on the comment about regulator_set_load() that you can find
> > below...
> >
> > > + if (ret)
> > > + goto out;
> > > + }
> > > +
> > > + ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, mmc->ios.vdd);
> > ...but I don't see that mmc->ios.vdd necessarily is in sync with
> > "level". Or do you here simply set the load based on what the hardware
> > tell you and then orthogonally to that let the core enable/disable the
> > regulator?
> >
> > Perhaps I'm just missing something obvious, but if not I believe this
> > warrants a comment describing that you're lowering the power level
> > regardless of the actual power being disabled.
>
> ios.vdd will be in sync with level. Vdd will be either 0 or a valid voltage
> (3v).
>
> This indirectly gets triggered/invoked through power-irq when driver writes
> 0
> or valid voltage to SDHCI_POWER_CONTROL register from
> sdhci_set_power_noreg().
Ok, thanks for explaining.
> > > +out:
> > > + if (ret)
> > > + pr_err("%s: vmmc set load/ocr failed: %d\n",
> > > + mmc_hostname(mmc), ret);
> > Please use:
> > dev_err(mmc_dev(mmc), ...);
> >
> > > +
> > > + return ret;
> > > +}
> > > +
> > > +static int sdhci_msm_set_vqmmc(struct sdhci_msm_host *msm_host,
> > > + struct mmc_host *mmc, int level)
> > vqmmc_enabled is a bool and "level" sounds like an int with several
> > possible values. So please make level bool here as well, to make it
> > easer to read..
> >
> > > +{
> > > + int load, ret;
> > > + struct mmc_ios ios;
> > > +
> > > + if (IS_ERR(mmc->supply.vqmmc) ||
> > > + (mmc->ios.power_mode == MMC_POWER_UNDEFINED) ||
> > > + (msm_host->vqmmc_enabled == level))
> > > + return 0;
> > > +
> > > + if (msm_host->vqmmc_load) {
> > > + load = level ? msm_host->vqmmc_load : 0;
> > > + ret = regulator_set_load(mmc->supply.vqmmc, load);
> > Since v5.0 the "load" of a regulator consumer is only taken into
> > consideration if the consumer is enabled. So given that you're toggling
> > the regulator below there's no need to change this here.
> >
> > Just specify the "active load" at probe time.
>
> For eMMC case, we don't disable this Vccq2 regulator by having always-on
> flag
> in the regulator node. Only for SDcard Vccq2 will be disabled.
> Sice driver is common for both eMMC and SDcard, I have to set 0 load to make
> it generic and to ensure eMMC Vccq2 regulator will be in LPM mode.
>
You should still call regulator_enable()/regulator_disable() on your
consumer regulator in this driver. When you do this the regulator core
will conclude that the regulator_dev (i.e. the part that represents the
hardware) is marked always_on and will not enable/disable the regulator.
But it will still invoke _regulator_handle_consumer_enable() and
_regulator_handle_consumer_disable(), which will aggregate the "load" of
all client regulators and update the regulator's load.
So this will apply the load as you expect regardless of it being
supplied by a regulator marked as always_on.
> >
> > > + if (ret)
> > > + goto out;
> > > + }
> > > +
> > > + /*
> > > + * The IO voltage regulator may not always support a voltage close to
> > > + * vdd. Set IO voltage based on capability of the regulator.
> > > + */
> > Is this comment related to the if/else-if inside the conditional? If so
> > please move it one line down.
> >
> > > + if (level) {
> > > + if (msm_host->caps_0 & CORE_3_0V_SUPPORT)
> > > + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_330;
> > > + else if (msm_host->caps_0 & CORE_1_8V_SUPPORT)
> > > + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_180;
> > Please add a space here, to indicate that the if statement on the next
> > line is unrelated to the if/elseif above.
> >
> > > + if (msm_host->caps_0 & CORE_VOLT_SUPPORT) {
> > > + pr_debug("%s: %s: setting signal voltage: %d\n",
> > > + mmc_hostname(mmc), __func__,
> > > + ios.signal_voltage);
> > I strongly believe you should replace these debug prints with
> > tracepoints, throughout the driver.
> >
> > > + ret = mmc_regulator_set_vqmmc(mmc, &ios);
> > > + if (ret < 0)
> > > + goto out;
> > > + }
> > > + ret = regulator_enable(mmc->supply.vqmmc);
> > > + } else {
> > > + ret = regulator_disable(mmc->supply.vqmmc);
> > > + }
> > Given that you don't need to regulator_set_load() this function is now
> > just one large if/else condition on a constant passed as an argument.
> > Please split it into sdhci_msm_enable_vqmmc() and
> > sdhci_msm_disable_vqmmc().
>
>
> Same response as above
> For eMMC case, we don't disable this Vccq2 regulator by having always-on
> flag
> in the regulator node. Only for SDcard Vccq2 will be disabled.
> Sice driver is common for both eMMC and SDcard, I have to set 0 load to make
> it generic and to ensure eMMC Vccq2 regulator will be in LPM mode.
>
> > > +out:
> > > + if (ret)
> > > + pr_err("%s: vqmmc failed: %d\n", mmc_hostname(mmc), ret);
> > I think it would be useful to know if this error came from
> > mmc_regulator_set_vqmmc() or regulator_enable() - or
> > regulator_disable().
> >
> > So please move this up and add some context in the error message, and
> > please use dev_err().
> >
> > > + else
> > > + msm_host->vqmmc_enabled = level;
> > > +
> > > + return ret;
> > > +}
> > > +
> > > static inline void sdhci_msm_init_pwr_irq_wait(struct sdhci_msm_host *msm_host)
> > > {
> > > init_waitqueue_head(&msm_host->pwr_irq_wait);
> > > @@ -1401,8 +1478,9 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
> > > {
> > > struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > > struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> > > + struct mmc_host *mmc = host->mmc;
> > > u32 irq_status, irq_ack = 0;
> > > - int retry = 10;
> > > + int retry = 10, ret = 0;
> > There's no need to initialize ret, in all occasions it's assigned before
> > being read.
> >
> > > u32 pwr_state = 0, io_level = 0;
> > > u32 config;
> > > const struct sdhci_msm_offset *msm_offset = msm_host->offset;
> > > @@ -1438,14 +1516,35 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
> > > /* Handle BUS ON/OFF*/
> > > if (irq_status & CORE_PWRCTL_BUS_ON) {
> > > - pwr_state = REQ_BUS_ON;
> > > - io_level = REQ_IO_HIGH;
> > > - irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> > > + ret = sdhci_msm_set_vmmc(msm_host, mmc, 1);
> > > + if (!ret)
> > > + ret = sdhci_msm_set_vqmmc(msm_host, mmc, 1);
> > I find this quite complex to follow. Wouldn't it be cleaner to retain
> > the 4 checks on irq_status as they are and then before the writel of
> > irq_ack check pwr_state and io_level and call sdhci_msm_set_{vmmc,vqmmc}
> > accordingly?
>
> I will see if i can update as you suggested.
>
> > > +
> > > + if (!ret) {
> > > + pwr_state = REQ_BUS_ON;
> > > + io_level = REQ_IO_HIGH;
> > > + irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> > > + } else {
> > > + pr_err("%s: BUS_ON req failed(%d). irq_status: 0x%08x\n",
> > > + mmc_hostname(mmc), ret, irq_status);
> > You already printed that this failed in sdhci_msm_set_{vmmc,vqmmc}, no
> > need to print again.
> >
> > > + irq_ack |= CORE_PWRCTL_BUS_FAIL;
> > > + sdhci_msm_set_vmmc(msm_host, mmc, 0);
> > > + }
> > > }
> > > if (irq_status & CORE_PWRCTL_BUS_OFF) {
> > > - pwr_state = REQ_BUS_OFF;
> > > - io_level = REQ_IO_LOW;
> > > - irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> > > + ret = sdhci_msm_set_vmmc(msm_host, mmc, 0);
> > > + if (!ret)
> > > + ret = sdhci_msm_set_vqmmc(msm_host, mmc, 0);
> > > +
> > > + if (!ret) {
> > > + pwr_state = REQ_BUS_OFF;
> > > + io_level = REQ_IO_LOW;
> > > + irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> > > + } else {
> > > + pr_err("%s: BUS_ON req failed(%d). irq_status: 0x%08x\n",
> > > + mmc_hostname(mmc), ret, irq_status);
> > > + irq_ack |= CORE_PWRCTL_BUS_FAIL;
> > > + }
> > > }
> > > /* Handle IO LOW/HIGH */
> > > if (irq_status & CORE_PWRCTL_IO_LOW) {
> > > @@ -1457,6 +1556,15 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
> > > irq_ack |= CORE_PWRCTL_IO_SUCCESS;
> > > }
> > > + if (io_level && !IS_ERR(mmc->supply.vqmmc) && !pwr_state) {
> > > + ret = mmc_regulator_set_vqmmc(mmc, &mmc->ios);
> > Didn't you already call this through sdhci_msm_set_vqmmc()?
>
> No.sdhci_msm_set_vqmmc handles only vqmmc ON/OFF. While turning it ON it
> sets
> Vqmmc to possbile default IO level (1.8v or 3.0v).
> Where this is only to make IO lines high (3.0v) or Low (1.8v).
If you move both the regulator operations here (below the point where
you figure out pwr_state and io_level), wouldn't it be possible to avoid
the additional, nested, vqmmc voltage request?
> > > + if (ret < 0)
> > > + pr_err("%s: IO_level setting failed(%d). signal_voltage: %d, vdd: %d irq_status: 0x%08x\n",
> > > + mmc_hostname(mmc), ret,
> > > + mmc->ios.signal_voltage, mmc->ios.vdd,
> > > + irq_status);
> > > + }
> > > +
> > > /*
> > > * The driver has to acknowledge the interrupt, switch voltages and
> > > * report back if it succeded or not to this register. The voltage
> > > @@ -1833,6 +1941,91 @@ static void sdhci_msm_reset(struct sdhci_host *host, u8 mask)
> > > sdhci_reset(host, mask);
> > > }
> > > +static int sdhci_msm_register_vreg(struct sdhci_msm_host *msm_host)
> > > +{
> > > + int ret = 0;
> > No need to initialize ret, first use is an assignment.
> >
> > > + struct mmc_host *mmc = msm_host->mmc;
> > > +
> > > + ret = mmc_regulator_get_supply(msm_host->mmc);
> > > + if (ret)
> > > + return ret;
> > > + device_property_read_u32(&msm_host->pdev->dev,
> > > + "vmmc-max-load-microamp",
> > > + &msm_host->vmmc_load);
> > > + device_property_read_u32(&msm_host->pdev->dev,
> > > + "vqmmc-max-load-microamp",
> > > + &msm_host->vqmmc_load);
> > These properties are not documented. Do they vary enough to mandate
> > being read from DT or could they simply be approximated by a define
> > instead?
>
> I can use defines. But since these values are different for eMMC and SDcard
> I will have to maintain two sets and need to have logic during probe to
> identify SDcard or eMMC and use the assign the set accordingly.
> So we tought, getting from dt is simpler and clean.
> In case Rob didn't agree with dt entries, I will go with this approach.
>
Sounds reasonable, let's see what Rob says.
> > > +
> > > + sdhci_msm_set_regulator_caps(msm_host);
> > > + mmc->ios.power_mode = MMC_POWER_UNDEFINED;
> > > +
> > > + return 0;
> > > +
> > > +}
> > > +
> > > +static int sdhci_msm_start_signal_voltage_switch(struct mmc_host *mmc,
> > > + struct mmc_ios *ios)
> > > +{
> > > + struct sdhci_host *host = mmc_priv(mmc);
> > > + u16 ctrl;
> > > +
> > > + /*
> > > + * Signal Voltage Switching is only applicable for Host Controllers
> > > + * v3.00 and above.
> > > + */
> > > + if (host->version < SDHCI_SPEC_300)
> > > + return 0;
> > > +
> > > + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> > > +
> > > + switch (ios->signal_voltage) {
> > > + case MMC_SIGNAL_VOLTAGE_330:
> > > + if (!(host->flags & SDHCI_SIGNALING_330))
> > > + return -EINVAL;
> > > + /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
> > > + ctrl &= ~SDHCI_CTRL_VDD_180;
> > > + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
> > > +
> > > + /* 3.3V regulator output should be stable within 5 ms */
> > What mechanism ensures that the readw won't return withing 5ms from the
> > writew above?
>
> Thanks for pointing this. This delay got missed. I will add it in next
> patchset.
Nice, thanks.
Regards,
Bjorn
On qcom SD host controllers voltage switching be done after the HW
is ready for it. The HW informs its readiness through power irq.
The voltage switching should happen only then.
So added support to register voltage regulators from the msm driver
and use them.
This patchset was posted long back but not actively pursued
https://lore.kernel.org/linux-arm-msm/[email protected]/
So posting it as fresh patchset.
Changes since V2:
- Removed redundant log from sdhci_msm_set_vmmc.
- Added the condition for skiping disabling of vqmmc for eMMC.
- Updated logic such that, setting load for vqmmc only if
it is kept ON.
- Retained ack by Adrian for second patch.
- Updated dt properties names as per Robs comments.
Changes since V1:
- Removed setting load for Vmmc regulator while turning it on/off.
Instead setting the active load once during probe.
- Simplified handlng of supplies for BUS_ON/OFF cases in shci_msm_handle_pwr_irq().
- Moved common code out of switch case in sdhci_msm_start_signal_voltage_switch().
- Updated variable name to sdhci_core_to_disable_vqmmc.
- Updated pr_err logs to dev_err logs.
Veerabhadrarao Badiganti (2):
dt-bindings: mmc: Supply max load for mmc supplies
mmc: sdhci-msm: Use internal voltage control
Vijay Viswanath (1):
mmc: sdhci: Allow platform controlled voltage switching
.../devicetree/bindings/mmc/mmc-controller.yaml | 6 +
drivers/mmc/host/sdhci-msm.c | 235 ++++++++++++++++++++-
drivers/mmc/host/sdhci.c | 32 +--
drivers/mmc/host/sdhci.h | 1 +
4 files changed, 252 insertions(+), 22 deletions(-)
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
On qcom SD host controllers voltage switching be done after the HW
is ready for it. The HW informs its readiness through power irq.
The voltage switching should happen only then.
Use the internal voltage switching and then control the voltage
switching using power irq.
Set the regulator load as well so that regulator can be configured
in LPM mode when in is not being used.
Co-developed-by: Asutosh Das <[email protected]>
Signed-off-by: Asutosh Das <[email protected]>
Co-developed-by: Vijay Viswanath <[email protected]>
Signed-off-by: Vijay Viswanath <[email protected]>
Co-developed-by: Veerabhadrarao Badiganti <[email protected]>
Signed-off-by: Veerabhadrarao Badiganti <[email protected]>
---
drivers/mmc/host/sdhci-msm.c | 235 +++++++++++++++++++++++++++++++++++++++++--
1 file changed, 226 insertions(+), 9 deletions(-)
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 95cd9735e9a3..20ef90fc7dd7 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -36,7 +36,9 @@
#define CORE_PWRCTL_IO_LOW BIT(2)
#define CORE_PWRCTL_IO_HIGH BIT(3)
#define CORE_PWRCTL_BUS_SUCCESS BIT(0)
+#define CORE_PWRCTL_BUS_FAIL BIT(1)
#define CORE_PWRCTL_IO_SUCCESS BIT(2)
+#define CORE_PWRCTL_IO_FAIL BIT(3)
#define REQ_BUS_OFF BIT(0)
#define REQ_BUS_ON BIT(1)
#define REQ_IO_LOW BIT(2)
@@ -277,6 +279,8 @@ struct sdhci_msm_host {
bool uses_tassadar_dll;
u32 dll_config;
u32 ddr_config;
+ u32 vqmmc_load;
+ bool vqmmc_enabled;
};
static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host)
@@ -1339,6 +1343,91 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
sdhci_msm_hs400(host, &mmc->ios);
}
+static int sdhci_msm_set_vmmc(struct mmc_host *mmc)
+{
+ if (IS_ERR(mmc->supply.vmmc))
+ return 0;
+
+ return mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, mmc->ios.vdd);
+}
+
+static int msm_toggle_vqmmc(struct sdhci_msm_host *msm_host,
+ struct mmc_host *mmc, bool level)
+{
+ int ret;
+ struct mmc_ios ios;
+
+ if (msm_host->vqmmc_enabled == level)
+ return 0;
+
+ if (level) {
+ /* Set the IO voltage regulator to default voltage level */
+ if (msm_host->caps_0 & CORE_3_0V_SUPPORT)
+ ios.signal_voltage = MMC_SIGNAL_VOLTAGE_330;
+ else if (msm_host->caps_0 & CORE_1_8V_SUPPORT)
+ ios.signal_voltage = MMC_SIGNAL_VOLTAGE_180;
+
+ if (msm_host->caps_0 & CORE_VOLT_SUPPORT) {
+ ret = mmc_regulator_set_vqmmc(mmc, &ios);
+ if (ret < 0) {
+ dev_err(mmc_dev(mmc), "%s: vqmmc set volgate failed: %d\n",
+ mmc_hostname(mmc), ret);
+ goto out;
+ }
+ }
+ ret = regulator_enable(mmc->supply.vqmmc);
+ } else {
+ ret = regulator_disable(mmc->supply.vqmmc);
+ }
+
+ if (ret)
+ dev_err(mmc_dev(mmc), "%s: vqmm %sable failed: %d\n",
+ mmc_hostname(mmc), level ? "en":"dis", ret);
+ else
+ msm_host->vqmmc_enabled = level;
+out:
+ return ret;
+}
+
+static int msm_config_vqmmc_mode(struct sdhci_msm_host *msm_host,
+ struct mmc_host *mmc, bool hpm)
+{
+ int load, ret;
+
+ if (!msm_host->vqmmc_load)
+ return 0;
+
+ load = hpm ? msm_host->vqmmc_load : 0;
+ ret = regulator_set_load(mmc->supply.vqmmc, load);
+ if (ret)
+ dev_err(mmc_dev(mmc), "%s: vqmmc set load failed: %d\n",
+ mmc_hostname(mmc), ret);
+ return ret;
+}
+
+static int sdhci_msm_set_vqmmc(struct sdhci_msm_host *msm_host,
+ struct mmc_host *mmc, bool level)
+{
+ int ret;
+ bool always_on;
+
+ if (IS_ERR(mmc->supply.vqmmc) ||
+ (mmc->ios.power_mode == MMC_POWER_UNDEFINED))
+ return 0;
+ /*
+ * For eMMC don't turn off Vqmmc, Instead just configure it in LPM
+ * and HPM modes by setting the right amonut of load.
+ */
+ always_on = mmc->card && mmc_card_mmc(mmc->card);
+
+ if (always_on)
+ ret = msm_config_vqmmc_mode(msm_host, mmc, level);
+ else
+ ret = msm_toggle_vqmmc(msm_host, mmc, level);
+
+ return ret;
+}
+
static inline void sdhci_msm_init_pwr_irq_wait(struct sdhci_msm_host *msm_host)
{
init_waitqueue_head(&msm_host->pwr_irq_wait);
@@ -1442,8 +1531,9 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+ struct mmc_host *mmc = host->mmc;
u32 irq_status, irq_ack = 0;
- int retry = 10;
+ int retry = 10, ret;
u32 pwr_state = 0, io_level = 0;
u32 config;
const struct sdhci_msm_offset *msm_offset = msm_host->offset;
@@ -1481,21 +1571,42 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
if (irq_status & CORE_PWRCTL_BUS_ON) {
pwr_state = REQ_BUS_ON;
io_level = REQ_IO_HIGH;
- irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
}
if (irq_status & CORE_PWRCTL_BUS_OFF) {
pwr_state = REQ_BUS_OFF;
io_level = REQ_IO_LOW;
- irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
}
+
+ if (pwr_state) {
+ ret = sdhci_msm_set_vmmc(mmc);
+ if (!ret)
+ ret = sdhci_msm_set_vqmmc(msm_host, mmc,
+ pwr_state & REQ_BUS_ON);
+ if (!ret)
+ irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
+ else
+ irq_ack |= CORE_PWRCTL_BUS_FAIL;
+ }
+
/* Handle IO LOW/HIGH */
- if (irq_status & CORE_PWRCTL_IO_LOW) {
+ if (irq_status & CORE_PWRCTL_IO_LOW)
io_level = REQ_IO_LOW;
- irq_ack |= CORE_PWRCTL_IO_SUCCESS;
- }
- if (irq_status & CORE_PWRCTL_IO_HIGH) {
+
+ if (irq_status & CORE_PWRCTL_IO_HIGH)
io_level = REQ_IO_HIGH;
+
+ if (io_level)
irq_ack |= CORE_PWRCTL_IO_SUCCESS;
+
+ if (io_level && !IS_ERR(mmc->supply.vqmmc) && !pwr_state) {
+ ret = mmc_regulator_set_vqmmc(mmc, &mmc->ios);
+ if (ret < 0) {
+ dev_err(mmc_dev(mmc), "%s: IO_level setting failed(%d). signal_voltage: %d, vdd: %d irq_status: 0x%08x\n",
+ mmc_hostname(mmc), ret,
+ mmc->ios.signal_voltage, mmc->ios.vdd,
+ irq_status);
+ irq_ack |= CORE_PWRCTL_IO_FAIL;
+ }
}
/*
@@ -1544,7 +1655,7 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
if (io_level)
msm_host->curr_io_level = io_level;
- pr_debug("%s: %s: Handled IRQ(%d), irq_status=0x%x, ack=0x%x\n",
+ dev_dbg(mmc_dev(mmc), "%s: %s: Handled IRQ(%d), irq_status=0x%x, ack=0x%x\n",
mmc_hostname(msm_host->mmc), __func__, irq, irq_status,
irq_ack);
}
@@ -1874,6 +1985,106 @@ static void sdhci_msm_reset(struct sdhci_host *host, u8 mask)
sdhci_reset(host, mask);
}
+static int sdhci_msm_register_vreg(struct sdhci_msm_host *msm_host)
+{
+ int ret;
+ u32 vmmc_load;
+ struct mmc_host *mmc = msm_host->mmc;
+
+ ret = mmc_regulator_get_supply(msm_host->mmc);
+ if (ret)
+ return ret;
+ device_property_read_u32(&msm_host->pdev->dev,
+ "vmmc-supply-max-microamp",
+ &vmmc_load);
+ device_property_read_u32(&msm_host->pdev->dev,
+ "vqmmc-supply-max-microamp",
+ &msm_host->vqmmc_load);
+
+ /* Set active load */
+ if (!IS_ERR(mmc->supply.vmmc) && vmmc_load) {
+ ret = regulator_set_load(mmc->supply.vmmc, vmmc_load);
+ if (ret) {
+ dev_err(mmc_dev(mmc), "%s: vmmc set active load failed: %d\n",
+ mmc_hostname(mmc), ret);
+ return ret;
+ }
+ }
+ if (!IS_ERR(mmc->supply.vqmmc) && msm_host->vqmmc_load) {
+ ret = regulator_set_load(mmc->supply.vmmc,
+ msm_host->vqmmc_load);
+ if (ret) {
+ dev_err(mmc_dev(mmc), "%s: vqmmc set active load failed: %d\n",
+ mmc_hostname(mmc), ret);
+ return ret;
+ }
+ }
+
+ sdhci_msm_set_regulator_caps(msm_host);
+ mmc->ios.power_mode = MMC_POWER_UNDEFINED;
+
+ return 0;
+}
+
+static int sdhci_msm_start_signal_voltage_switch(struct mmc_host *mmc,
+ struct mmc_ios *ios)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+ u16 ctrl, status;
+
+ /*
+ * Signal Voltage Switching is only applicable for Host Controllers
+ * v3.00 and above.
+ */
+ if (host->version < SDHCI_SPEC_300)
+ return 0;
+
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+
+ switch (ios->signal_voltage) {
+ case MMC_SIGNAL_VOLTAGE_330:
+ if (!(host->flags & SDHCI_SIGNALING_330))
+ return -EINVAL;
+
+ /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
+ ctrl &= ~SDHCI_CTRL_VDD_180;
+ break;
+ case MMC_SIGNAL_VOLTAGE_180:
+ if (!(host->flags & SDHCI_SIGNALING_180))
+ return -EINVAL;
+
+ /*
+ * Enable 1.8V Signal Enable in the Host Control2
+ * register
+ */
+ ctrl |= SDHCI_CTRL_VDD_180;
+ break;
+ case MMC_SIGNAL_VOLTAGE_120:
+ if (!(host->flags & SDHCI_SIGNALING_120))
+ return -EINVAL;
+ return 0;
+ default:
+ /* No signal voltage switch required */
+ return 0;
+ }
+
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+
+ /* Wait for 5ms */
+ usleep_range(5000, 5500);
+
+ /* regulator output should be stable within 5 ms */
+ status = ctrl & SDHCI_CTRL_VDD_180;
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ if ((ctrl & SDHCI_CTRL_VDD_180) == status)
+ return 0;
+
+ dev_warn(mmc_dev(mmc), "%s: Regulator output did not became stable\n",
+ mmc_hostname(mmc));
+
+ return -EAGAIN;
+}
+
#define DRIVER_NAME "sdhci_msm"
#define SDHCI_MSM_DUMP(f, x...) \
pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
@@ -1960,6 +2171,7 @@ void sdhci_msm_dump_vendor_regs(struct sdhci_host *host)
.write_b = sdhci_msm_writeb,
.irq = sdhci_msm_cqe_irq,
.dump_vendor_regs = sdhci_msm_dump_vendor_regs,
+ .set_power = sdhci_set_power_noreg,
};
static const struct sdhci_pltfm_data sdhci_msm_pdata = {
@@ -2169,6 +2381,10 @@ static int sdhci_msm_probe(struct platform_device *pdev)
if (core_major == 1 && core_minor >= 0x49)
msm_host->updated_ddr_cfg = true;
+ ret = sdhci_msm_register_vreg(msm_host);
+ if (ret)
+ goto clk_disable;
+
/*
* Power on reset state may trigger power irq if previous status of
* PWRCTL was either BUS_ON or IO_HIGH_V. So before enabling pwr irq
@@ -2213,6 +2429,8 @@ static int sdhci_msm_probe(struct platform_device *pdev)
MSM_MMC_AUTOSUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(&pdev->dev);
+ host->mmc_host_ops.start_signal_voltage_switch =
+ sdhci_msm_start_signal_voltage_switch;
host->mmc_host_ops.execute_tuning = sdhci_msm_execute_tuning;
if (of_property_read_bool(node, "supports-cqe"))
ret = sdhci_msm_cqe_add_host(host, pdev);
@@ -2220,7 +2438,6 @@ static int sdhci_msm_probe(struct platform_device *pdev)
ret = sdhci_add_host(host);
if (ret)
goto pm_runtime_disable;
- sdhci_msm_set_regulator_caps(msm_host);
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
Hi Bjorn,
Do you have any comments on V3 patchset?
Thanks
Veera
On 6/2/2020 4:17 PM, Veerabhadrarao Badiganti wrote:
> On qcom SD host controllers voltage switching be done after the HW
> is ready for it. The HW informs its readiness through power irq.
> The voltage switching should happen only then.
>
> Use the internal voltage switching and then control the voltage
> switching using power irq.
>
> Set the regulator load as well so that regulator can be configured
> in LPM mode when in is not being used.
>
> Co-developed-by: Asutosh Das <[email protected]>
> Signed-off-by: Asutosh Das <[email protected]>
> Co-developed-by: Vijay Viswanath <[email protected]>
> Signed-off-by: Vijay Viswanath <[email protected]>
> Co-developed-by: Veerabhadrarao Badiganti <[email protected]>
> Signed-off-by: Veerabhadrarao Badiganti <[email protected]>
> ---
> drivers/mmc/host/sdhci-msm.c | 235 +++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 226 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 95cd9735e9a3..20ef90fc7dd7 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -36,7 +36,9 @@
> #define CORE_PWRCTL_IO_LOW BIT(2)
> #define CORE_PWRCTL_IO_HIGH BIT(3)
> #define CORE_PWRCTL_BUS_SUCCESS BIT(0)
> +#define CORE_PWRCTL_BUS_FAIL BIT(1)
> #define CORE_PWRCTL_IO_SUCCESS BIT(2)
> +#define CORE_PWRCTL_IO_FAIL BIT(3)
> #define REQ_BUS_OFF BIT(0)
> #define REQ_BUS_ON BIT(1)
> #define REQ_IO_LOW BIT(2)
> @@ -277,6 +279,8 @@ struct sdhci_msm_host {
> bool uses_tassadar_dll;
> u32 dll_config;
> u32 ddr_config;
> + u32 vqmmc_load;
> + bool vqmmc_enabled;
> };
>
> static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host)
> @@ -1339,6 +1343,91 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
> sdhci_msm_hs400(host, &mmc->ios);
> }
>
> +static int sdhci_msm_set_vmmc(struct mmc_host *mmc)
> +{
> + if (IS_ERR(mmc->supply.vmmc))
> + return 0;
> +
> + return mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, mmc->ios.vdd);
> +}
> +
> +static int msm_toggle_vqmmc(struct sdhci_msm_host *msm_host,
> + struct mmc_host *mmc, bool level)
> +{
> + int ret;
> + struct mmc_ios ios;
> +
> + if (msm_host->vqmmc_enabled == level)
> + return 0;
> +
> + if (level) {
> + /* Set the IO voltage regulator to default voltage level */
> + if (msm_host->caps_0 & CORE_3_0V_SUPPORT)
> + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_330;
> + else if (msm_host->caps_0 & CORE_1_8V_SUPPORT)
> + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_180;
> +
> + if (msm_host->caps_0 & CORE_VOLT_SUPPORT) {
> + ret = mmc_regulator_set_vqmmc(mmc, &ios);
> + if (ret < 0) {
> + dev_err(mmc_dev(mmc), "%s: vqmmc set volgate failed: %d\n",
> + mmc_hostname(mmc), ret);
> + goto out;
> + }
> + }
> + ret = regulator_enable(mmc->supply.vqmmc);
> + } else {
> + ret = regulator_disable(mmc->supply.vqmmc);
> + }
> +
> + if (ret)
> + dev_err(mmc_dev(mmc), "%s: vqmm %sable failed: %d\n",
> + mmc_hostname(mmc), level ? "en":"dis", ret);
> + else
> + msm_host->vqmmc_enabled = level;
> +out:
> + return ret;
> +}
> +
> +static int msm_config_vqmmc_mode(struct sdhci_msm_host *msm_host,
> + struct mmc_host *mmc, bool hpm)
> +{
> + int load, ret;
> +
> + if (!msm_host->vqmmc_load)
> + return 0;
> +
> + load = hpm ? msm_host->vqmmc_load : 0;
> + ret = regulator_set_load(mmc->supply.vqmmc, load);
> + if (ret)
> + dev_err(mmc_dev(mmc), "%s: vqmmc set load failed: %d\n",
> + mmc_hostname(mmc), ret);
> + return ret;
> +}
> +
> +static int sdhci_msm_set_vqmmc(struct sdhci_msm_host *msm_host,
> + struct mmc_host *mmc, bool level)
> +{
> + int ret;
> + bool always_on;
> +
> + if (IS_ERR(mmc->supply.vqmmc) ||
> + (mmc->ios.power_mode == MMC_POWER_UNDEFINED))
> + return 0;
> + /*
> + * For eMMC don't turn off Vqmmc, Instead just configure it in LPM
> + * and HPM modes by setting the right amonut of load.
> + */
> + always_on = mmc->card && mmc_card_mmc(mmc->card);
> +
> + if (always_on)
> + ret = msm_config_vqmmc_mode(msm_host, mmc, level);
> + else
> + ret = msm_toggle_vqmmc(msm_host, mmc, level);
> +
> + return ret;
> +}
> +
> static inline void sdhci_msm_init_pwr_irq_wait(struct sdhci_msm_host *msm_host)
> {
> init_waitqueue_head(&msm_host->pwr_irq_wait);
> @@ -1442,8 +1531,9 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
> {
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> + struct mmc_host *mmc = host->mmc;
> u32 irq_status, irq_ack = 0;
> - int retry = 10;
> + int retry = 10, ret;
> u32 pwr_state = 0, io_level = 0;
> u32 config;
> const struct sdhci_msm_offset *msm_offset = msm_host->offset;
> @@ -1481,21 +1571,42 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
> if (irq_status & CORE_PWRCTL_BUS_ON) {
> pwr_state = REQ_BUS_ON;
> io_level = REQ_IO_HIGH;
> - irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> }
> if (irq_status & CORE_PWRCTL_BUS_OFF) {
> pwr_state = REQ_BUS_OFF;
> io_level = REQ_IO_LOW;
> - irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> }
> +
> + if (pwr_state) {
> + ret = sdhci_msm_set_vmmc(mmc);
> + if (!ret)
> + ret = sdhci_msm_set_vqmmc(msm_host, mmc,
> + pwr_state & REQ_BUS_ON);
> + if (!ret)
> + irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> + else
> + irq_ack |= CORE_PWRCTL_BUS_FAIL;
> + }
> +
> /* Handle IO LOW/HIGH */
> - if (irq_status & CORE_PWRCTL_IO_LOW) {
> + if (irq_status & CORE_PWRCTL_IO_LOW)
> io_level = REQ_IO_LOW;
> - irq_ack |= CORE_PWRCTL_IO_SUCCESS;
> - }
> - if (irq_status & CORE_PWRCTL_IO_HIGH) {
> +
> + if (irq_status & CORE_PWRCTL_IO_HIGH)
> io_level = REQ_IO_HIGH;
> +
> + if (io_level)
> irq_ack |= CORE_PWRCTL_IO_SUCCESS;
> +
> + if (io_level && !IS_ERR(mmc->supply.vqmmc) && !pwr_state) {
> + ret = mmc_regulator_set_vqmmc(mmc, &mmc->ios);
> + if (ret < 0) {
> + dev_err(mmc_dev(mmc), "%s: IO_level setting failed(%d). signal_voltage: %d, vdd: %d irq_status: 0x%08x\n",
> + mmc_hostname(mmc), ret,
> + mmc->ios.signal_voltage, mmc->ios.vdd,
> + irq_status);
> + irq_ack |= CORE_PWRCTL_IO_FAIL;
> + }
> }
>
> /*
> @@ -1544,7 +1655,7 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
> if (io_level)
> msm_host->curr_io_level = io_level;
>
> - pr_debug("%s: %s: Handled IRQ(%d), irq_status=0x%x, ack=0x%x\n",
> + dev_dbg(mmc_dev(mmc), "%s: %s: Handled IRQ(%d), irq_status=0x%x, ack=0x%x\n",
> mmc_hostname(msm_host->mmc), __func__, irq, irq_status,
> irq_ack);
> }
> @@ -1874,6 +1985,106 @@ static void sdhci_msm_reset(struct sdhci_host *host, u8 mask)
> sdhci_reset(host, mask);
> }
>
> +static int sdhci_msm_register_vreg(struct sdhci_msm_host *msm_host)
> +{
> + int ret;
> + u32 vmmc_load;
> + struct mmc_host *mmc = msm_host->mmc;
> +
> + ret = mmc_regulator_get_supply(msm_host->mmc);
> + if (ret)
> + return ret;
> + device_property_read_u32(&msm_host->pdev->dev,
> + "vmmc-supply-max-microamp",
> + &vmmc_load);
> + device_property_read_u32(&msm_host->pdev->dev,
> + "vqmmc-supply-max-microamp",
> + &msm_host->vqmmc_load);
> +
> + /* Set active load */
> + if (!IS_ERR(mmc->supply.vmmc) && vmmc_load) {
> + ret = regulator_set_load(mmc->supply.vmmc, vmmc_load);
> + if (ret) {
> + dev_err(mmc_dev(mmc), "%s: vmmc set active load failed: %d\n",
> + mmc_hostname(mmc), ret);
> + return ret;
> + }
> + }
> + if (!IS_ERR(mmc->supply.vqmmc) && msm_host->vqmmc_load) {
> + ret = regulator_set_load(mmc->supply.vmmc,
> + msm_host->vqmmc_load);
> + if (ret) {
> + dev_err(mmc_dev(mmc), "%s: vqmmc set active load failed: %d\n",
> + mmc_hostname(mmc), ret);
> + return ret;
> + }
> + }
> +
> + sdhci_msm_set_regulator_caps(msm_host);
> + mmc->ios.power_mode = MMC_POWER_UNDEFINED;
> +
> + return 0;
> +}
> +
> +static int sdhci_msm_start_signal_voltage_switch(struct mmc_host *mmc,
> + struct mmc_ios *ios)
> +{
> + struct sdhci_host *host = mmc_priv(mmc);
> + u16 ctrl, status;
> +
> + /*
> + * Signal Voltage Switching is only applicable for Host Controllers
> + * v3.00 and above.
> + */
> + if (host->version < SDHCI_SPEC_300)
> + return 0;
> +
> + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> +
> + switch (ios->signal_voltage) {
> + case MMC_SIGNAL_VOLTAGE_330:
> + if (!(host->flags & SDHCI_SIGNALING_330))
> + return -EINVAL;
> +
> + /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
> + ctrl &= ~SDHCI_CTRL_VDD_180;
> + break;
> + case MMC_SIGNAL_VOLTAGE_180:
> + if (!(host->flags & SDHCI_SIGNALING_180))
> + return -EINVAL;
> +
> + /*
> + * Enable 1.8V Signal Enable in the Host Control2
> + * register
> + */
> + ctrl |= SDHCI_CTRL_VDD_180;
> + break;
> + case MMC_SIGNAL_VOLTAGE_120:
> + if (!(host->flags & SDHCI_SIGNALING_120))
> + return -EINVAL;
> + return 0;
> + default:
> + /* No signal voltage switch required */
> + return 0;
> + }
> +
> + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
> +
> + /* Wait for 5ms */
> + usleep_range(5000, 5500);
> +
> + /* regulator output should be stable within 5 ms */
> + status = ctrl & SDHCI_CTRL_VDD_180;
> + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> + if ((ctrl & SDHCI_CTRL_VDD_180) == status)
> + return 0;
> +
> + dev_warn(mmc_dev(mmc), "%s: Regulator output did not became stable\n",
> + mmc_hostname(mmc));
> +
> + return -EAGAIN;
> +}
> +
> #define DRIVER_NAME "sdhci_msm"
> #define SDHCI_MSM_DUMP(f, x...) \
> pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
> @@ -1960,6 +2171,7 @@ void sdhci_msm_dump_vendor_regs(struct sdhci_host *host)
> .write_b = sdhci_msm_writeb,
> .irq = sdhci_msm_cqe_irq,
> .dump_vendor_regs = sdhci_msm_dump_vendor_regs,
> + .set_power = sdhci_set_power_noreg,
> };
>
> static const struct sdhci_pltfm_data sdhci_msm_pdata = {
> @@ -2169,6 +2381,10 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> if (core_major == 1 && core_minor >= 0x49)
> msm_host->updated_ddr_cfg = true;
>
> + ret = sdhci_msm_register_vreg(msm_host);
> + if (ret)
> + goto clk_disable;
> +
> /*
> * Power on reset state may trigger power irq if previous status of
> * PWRCTL was either BUS_ON or IO_HIGH_V. So before enabling pwr irq
> @@ -2213,6 +2429,8 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> MSM_MMC_AUTOSUSPEND_DELAY_MS);
> pm_runtime_use_autosuspend(&pdev->dev);
>
> + host->mmc_host_ops.start_signal_voltage_switch =
> + sdhci_msm_start_signal_voltage_switch;
> host->mmc_host_ops.execute_tuning = sdhci_msm_execute_tuning;
> if (of_property_read_bool(node, "supports-cqe"))
> ret = sdhci_msm_cqe_add_host(host, pdev);
> @@ -2220,7 +2438,6 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> ret = sdhci_add_host(host);
> if (ret)
> goto pm_runtime_disable;
> - sdhci_msm_set_regulator_caps(msm_host);
>
> pm_runtime_mark_last_busy(&pdev->dev);
> pm_runtime_put_autosuspend(&pdev->dev);
On qcom SD host controllers voltage switching be done after the HW
is ready for it. The HW informs its readiness through power irq.
The voltage switching should happen only then.
So added support to register voltage regulators from the msm driver
and use them.
This patchset was posted long back but not actively pursued
https://lore.kernel.org/linux-arm-msm/[email protected]/
So posting it as fresh patchset.
Changes since V3:
- Dropped reading of regulator load values from device tree.
- Dropped documentaiton chagne.
- Since only Vqmmc supply of eMMC would be kept On during suspend,
setting load only for this regulator so that it can go to LPM.
And since this Load reamins same, load value is hard-coded in the driver.
Changes since V2:
- Removed redundant log from sdhci_msm_set_vmmc.
- Added the condition for skiping disabling of vqmmc for eMMC.
- Updated logic such that, setting load for vqmmc only if
it is kept ON.
- Retained ack by Adrian for second patch.
- Updated dt properties names as per Robs comments.
Changes since V1:
- Removed setting load for Vmmc regulator while turning it on/off.
Instead setting the active load once during probe.
- Simplified handlng of supplies for BUS_ON/OFF cases in shci_msm_handle_pwr_irq().
- Moved common code out of switch case in sdhci_msm_start_signal_voltage_switch().
- Updated variable name to sdhci_core_to_disable_vqmmc.
- Updated pr_err logs to dev_err logs.
Veerabhadrarao Badiganti (2):
dt-bindings: mmc: Supply max load for mmc supplies
mmc: sdhci-msm: Use internal voltage control
Vijay Viswanath (1):
mmc: sdhci: Allow platform controlled voltage switching
drivers/mmc/host/sdhci-msm.c | 208 +++++++++++++++++++++++++++++++++++++++++--
drivers/mmc/host/sdhci.c | 32 ++++---
drivers/mmc/host/sdhci.h | 1 +
3 files changed, 219 insertions(+), 22 deletions(-)
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
On qcom SD host controllers voltage switching be done after the HW
is ready for it. The HW informs its readiness through power irq.
The voltage switching should happen only then.
So added support to register voltage regulators from the msm driver
and use them.
This patchset was posted long back but not actively pursued
https://lore.kernel.org/linux-arm-msm/[email protected]/
So posting it as fresh patchset.
Changes since V4:
- Added clear comments on condtion which allows either to
tunf off/on Vqmmc or to set load.
- Added mmc_card_removable() to the condtion whcih checks
if the card is eMMC or other card.
- Rerturning error for unsupported voltagtes in
sdhci_msm_start_signal_voltage_switch()
- Moved setting ios.power_mode to mmc_alloc_host().
Changes since V3:
- Dropped reading of regulator load values from device tree.
- Dropped documentaiton chagne.
- Since only Vqmmc supply of eMMC would be kept On during suspend,
setting load only for this regulator so that it can go to LPM.
And since this Load reamins same, load value is hard-coded in the driver.
Changes since V2:
- Removed redundant log from sdhci_msm_set_vmmc.
- Added the condition for skiping disabling of vqmmc for eMMC.
- Updated logic such that, setting load for vqmmc only if
it is kept ON.
- Retained ack by Adrian for second patch.
- Updated dt properties names as per Robs comments.
Changes since V1:
- Removed setting load for Vmmc regulator while turning it on/off.
Instead setting the active load once during probe.
- Simplified handlng of supplies for BUS_ON/OFF cases in shci_msm_handle_pwr_irq().
- Moved common code out of switch case in sdhci_msm_start_signal_voltage_switch().
- Updated variable name to sdhci_core_to_disable_vqmmc.
- Updated pr_err logs to dev_err logs.
Veerabhadrarao Badiganti (2):
mmc: core: Set default power mode in mmc_alloc_host
mmc: sdhci-msm: Use internal voltage control
Vijay Viswanath (1):
mmc: sdhci: Allow platform controlled voltage switching
drivers/mmc/core/host.c | 1 +
drivers/mmc/host/sdhci-msm.c | 206 +++++++++++++++++++++++++++++++++++++++++--
drivers/mmc/host/sdhci.c | 32 ++++---
drivers/mmc/host/sdhci.h | 1 +
4 files changed, 218 insertions(+), 22 deletions(-)
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
On qcom SD host controllers voltage switching be done after the HW
is ready for it. The HW informs its readiness through power irq.
The voltage switching should happen only then.
Use the internal voltage switching and then control the voltage
switching using power irq.
IO-bus supply of eMMC would be kept always-on. So set the load
for this supply to configure it in LPM when eMMC is suspend state
and in HPM when eMMC is active.
Co-developed-by: Asutosh Das <[email protected]>
Signed-off-by: Asutosh Das <[email protected]>
Co-developed-by: Vijay Viswanath <[email protected]>
Signed-off-by: Vijay Viswanath <[email protected]>
Co-developed-by: Veerabhadrarao Badiganti <[email protected]>
Signed-off-by: Veerabhadrarao Badiganti <[email protected]>
---
drivers/mmc/host/sdhci-msm.c | 206 +++++++++++++++++++++++++++++++++++++++++--
1 file changed, 197 insertions(+), 9 deletions(-)
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 15c42b059240..cbe15519e7b9 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -37,7 +37,9 @@
#define CORE_PWRCTL_IO_LOW BIT(2)
#define CORE_PWRCTL_IO_HIGH BIT(3)
#define CORE_PWRCTL_BUS_SUCCESS BIT(0)
+#define CORE_PWRCTL_BUS_FAIL BIT(1)
#define CORE_PWRCTL_IO_SUCCESS BIT(2)
+#define CORE_PWRCTL_IO_FAIL BIT(3)
#define REQ_BUS_OFF BIT(0)
#define REQ_BUS_ON BIT(1)
#define REQ_IO_LOW BIT(2)
@@ -127,6 +129,9 @@
/* Timeout value to avoid infinite waiting for pwr_irq */
#define MSM_PWR_IRQ_TIMEOUT_MS 5000
+/* Max load for eMMC Vdd-io supply */
+#define MMC_VQMMC_MAX_LOAD_UA 325000
+
#define msm_host_readl(msm_host, host, offset) \
msm_host->var_ops->msm_readl_relaxed(host, offset)
@@ -278,6 +283,7 @@ struct sdhci_msm_host {
bool uses_tassadar_dll;
u32 dll_config;
u32 ddr_config;
+ bool vqmmc_enabled;
};
static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host)
@@ -1346,6 +1352,95 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
sdhci_msm_hs400(host, &mmc->ios);
}
+static int sdhci_msm_set_vmmc(struct mmc_host *mmc)
+{
+ if (IS_ERR(mmc->supply.vmmc))
+ return 0;
+
+ return mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, mmc->ios.vdd);
+}
+
+static int msm_toggle_vqmmc(struct sdhci_msm_host *msm_host,
+ struct mmc_host *mmc, bool level)
+{
+ int ret;
+ struct mmc_ios ios;
+
+ if (msm_host->vqmmc_enabled == level)
+ return 0;
+
+ if (level) {
+ /* Set the IO voltage regulator to default voltage level */
+ if (msm_host->caps_0 & CORE_3_0V_SUPPORT)
+ ios.signal_voltage = MMC_SIGNAL_VOLTAGE_330;
+ else if (msm_host->caps_0 & CORE_1_8V_SUPPORT)
+ ios.signal_voltage = MMC_SIGNAL_VOLTAGE_180;
+
+ if (msm_host->caps_0 & CORE_VOLT_SUPPORT) {
+ ret = mmc_regulator_set_vqmmc(mmc, &ios);
+ if (ret < 0) {
+ dev_err(mmc_dev(mmc), "%s: vqmmc set volgate failed: %d\n",
+ mmc_hostname(mmc), ret);
+ goto out;
+ }
+ }
+ ret = regulator_enable(mmc->supply.vqmmc);
+ } else {
+ ret = regulator_disable(mmc->supply.vqmmc);
+ }
+
+ if (ret)
+ dev_err(mmc_dev(mmc), "%s: vqmm %sable failed: %d\n",
+ mmc_hostname(mmc), level ? "en":"dis", ret);
+ else
+ msm_host->vqmmc_enabled = level;
+out:
+ return ret;
+}
+
+static int msm_config_vqmmc_mode(struct sdhci_msm_host *msm_host,
+ struct mmc_host *mmc, bool hpm)
+{
+ int load, ret;
+
+ load = hpm ? MMC_VQMMC_MAX_LOAD_UA : 0;
+ ret = regulator_set_load(mmc->supply.vqmmc, load);
+ if (ret)
+ dev_err(mmc_dev(mmc), "%s: vqmmc set load failed: %d\n",
+ mmc_hostname(mmc), ret);
+ return ret;
+}
+
+static int sdhci_msm_set_vqmmc(struct sdhci_msm_host *msm_host,
+ struct mmc_host *mmc, bool level)
+{
+ int ret;
+ bool always_on;
+
+ if (IS_ERR(mmc->supply.vqmmc) ||
+ (mmc->ios.power_mode == MMC_POWER_UNDEFINED))
+ return 0;
+ /*
+ * For eMMC don't turn off Vqmmc, Instead just configure it in LPM
+ * and HPM modes by setting the corresponding load.
+ *
+ * Till eMMC is initialized (i.e. always_on == 0), just turn on/off
+ * Vqmmc. Vqmmc gets turned off only if init fails and mmc_power_off
+ * gets invoked. Once eMMC is initialized (i.e. always_on == 1),
+ * Vqmmc should remain ON, So just set the load instead of turning it
+ * off/on.
+ */
+ always_on = !mmc_card_is_removable(mmc) &&
+ mmc->card && mmc_card_mmc(mmc->card);
+
+ if (always_on)
+ ret = msm_config_vqmmc_mode(msm_host, mmc, level);
+ else
+ ret = msm_toggle_vqmmc(msm_host, mmc, level);
+
+ return ret;
+}
+
static inline void sdhci_msm_init_pwr_irq_wait(struct sdhci_msm_host *msm_host)
{
init_waitqueue_head(&msm_host->pwr_irq_wait);
@@ -1449,8 +1544,9 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+ struct mmc_host *mmc = host->mmc;
u32 irq_status, irq_ack = 0;
- int retry = 10;
+ int retry = 10, ret;
u32 pwr_state = 0, io_level = 0;
u32 config;
const struct sdhci_msm_offset *msm_offset = msm_host->offset;
@@ -1488,21 +1584,42 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
if (irq_status & CORE_PWRCTL_BUS_ON) {
pwr_state = REQ_BUS_ON;
io_level = REQ_IO_HIGH;
- irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
}
if (irq_status & CORE_PWRCTL_BUS_OFF) {
pwr_state = REQ_BUS_OFF;
io_level = REQ_IO_LOW;
- irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
}
+
+ if (pwr_state) {
+ ret = sdhci_msm_set_vmmc(mmc);
+ if (!ret)
+ ret = sdhci_msm_set_vqmmc(msm_host, mmc,
+ pwr_state & REQ_BUS_ON);
+ if (!ret)
+ irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
+ else
+ irq_ack |= CORE_PWRCTL_BUS_FAIL;
+ }
+
/* Handle IO LOW/HIGH */
- if (irq_status & CORE_PWRCTL_IO_LOW) {
+ if (irq_status & CORE_PWRCTL_IO_LOW)
io_level = REQ_IO_LOW;
- irq_ack |= CORE_PWRCTL_IO_SUCCESS;
- }
- if (irq_status & CORE_PWRCTL_IO_HIGH) {
+
+ if (irq_status & CORE_PWRCTL_IO_HIGH)
io_level = REQ_IO_HIGH;
+
+ if (io_level)
irq_ack |= CORE_PWRCTL_IO_SUCCESS;
+
+ if (io_level && !IS_ERR(mmc->supply.vqmmc) && !pwr_state) {
+ ret = mmc_regulator_set_vqmmc(mmc, &mmc->ios);
+ if (ret < 0) {
+ dev_err(mmc_dev(mmc), "%s: IO_level setting failed(%d). signal_voltage: %d, vdd: %d irq_status: 0x%08x\n",
+ mmc_hostname(mmc), ret,
+ mmc->ios.signal_voltage, mmc->ios.vdd,
+ irq_status);
+ irq_ack |= CORE_PWRCTL_IO_FAIL;
+ }
}
/*
@@ -1551,7 +1668,7 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
if (io_level)
msm_host->curr_io_level = io_level;
- pr_debug("%s: %s: Handled IRQ(%d), irq_status=0x%x, ack=0x%x\n",
+ dev_dbg(mmc_dev(mmc), "%s: %s: Handled IRQ(%d), irq_status=0x%x, ack=0x%x\n",
mmc_hostname(msm_host->mmc), __func__, irq, irq_status,
irq_ack);
}
@@ -1881,6 +1998,71 @@ static void sdhci_msm_reset(struct sdhci_host *host, u8 mask)
sdhci_reset(host, mask);
}
+static int sdhci_msm_register_vreg(struct sdhci_msm_host *msm_host)
+{
+ int ret;
+
+ ret = mmc_regulator_get_supply(msm_host->mmc);
+ if (ret)
+ return ret;
+
+ sdhci_msm_set_regulator_caps(msm_host);
+
+ return 0;
+}
+
+static int sdhci_msm_start_signal_voltage_switch(struct mmc_host *mmc,
+ struct mmc_ios *ios)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+ u16 ctrl, status;
+
+ /*
+ * Signal Voltage Switching is only applicable for Host Controllers
+ * v3.00 and above.
+ */
+ if (host->version < SDHCI_SPEC_300)
+ return 0;
+
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+
+ switch (ios->signal_voltage) {
+ case MMC_SIGNAL_VOLTAGE_330:
+ if (!(host->flags & SDHCI_SIGNALING_330))
+ return -EINVAL;
+
+ /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
+ ctrl &= ~SDHCI_CTRL_VDD_180;
+ break;
+ case MMC_SIGNAL_VOLTAGE_180:
+ if (!(host->flags & SDHCI_SIGNALING_180))
+ return -EINVAL;
+
+ /* Enable 1.8V Signal Enable in the Host Control2 register */
+ ctrl |= SDHCI_CTRL_VDD_180;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+
+ /* Wait for 5ms */
+ usleep_range(5000, 5500);
+
+ /* regulator output should be stable within 5 ms */
+ status = ctrl & SDHCI_CTRL_VDD_180;
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ if ((ctrl & SDHCI_CTRL_VDD_180) == status)
+ return 0;
+
+ dev_warn(mmc_dev(mmc), "%s: Regulator output did not became stable\n",
+ mmc_hostname(mmc));
+
+ return -EAGAIN;
+}
+
#define DRIVER_NAME "sdhci_msm"
#define SDHCI_MSM_DUMP(f, x...) \
pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
@@ -1967,6 +2149,7 @@ void sdhci_msm_dump_vendor_regs(struct sdhci_host *host)
.write_b = sdhci_msm_writeb,
.irq = sdhci_msm_cqe_irq,
.dump_vendor_regs = sdhci_msm_dump_vendor_regs,
+ .set_power = sdhci_set_power_noreg,
};
static const struct sdhci_pltfm_data sdhci_msm_pdata = {
@@ -2181,6 +2364,10 @@ static int sdhci_msm_probe(struct platform_device *pdev)
if (core_major == 1 && core_minor >= 0x49)
msm_host->updated_ddr_cfg = true;
+ ret = sdhci_msm_register_vreg(msm_host);
+ if (ret)
+ goto clk_disable;
+
/*
* Power on reset state may trigger power irq if previous status of
* PWRCTL was either BUS_ON or IO_HIGH_V. So before enabling pwr irq
@@ -2225,6 +2412,8 @@ static int sdhci_msm_probe(struct platform_device *pdev)
MSM_MMC_AUTOSUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(&pdev->dev);
+ host->mmc_host_ops.start_signal_voltage_switch =
+ sdhci_msm_start_signal_voltage_switch;
host->mmc_host_ops.execute_tuning = sdhci_msm_execute_tuning;
if (of_property_read_bool(node, "supports-cqe"))
ret = sdhci_msm_cqe_add_host(host, pdev);
@@ -2232,7 +2421,6 @@ static int sdhci_msm_probe(struct platform_device *pdev)
ret = sdhci_add_host(host);
if (ret)
goto pm_runtime_disable;
- sdhci_msm_set_regulator_caps(msm_host);
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
Set the default power mode (which is MMC_POWER_UNDEFINE)
in mmc_alloc_host, so that the vendor drivers can make use of this
state to perform needed actions during the platform driver probe.
Signed-off-by: Veerabhadrarao Badiganti <[email protected]>
---
drivers/mmc/core/host.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 6141a85749ca..793597556cd7 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -434,6 +434,7 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
host->fixed_drv_type = -EINVAL;
host->ios.power_delay_ms = 10;
+ host->ios.power_mode = MMC_POWER_UNDEFINED;
return host;
}
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
On Tue, 23 Jun 2020 at 15:35, Veerabhadrarao Badiganti
<[email protected]> wrote:
>
> On qcom SD host controllers voltage switching be done after the HW
> is ready for it. The HW informs its readiness through power irq.
> The voltage switching should happen only then.
>
> So added support to register voltage regulators from the msm driver
> and use them.
>
> This patchset was posted long back but not actively pursued
> https://lore.kernel.org/linux-arm-msm/[email protected]/
> So posting it as fresh patchset.
>
> Changes since V4:
> - Added clear comments on condtion which allows either to
> tunf off/on Vqmmc or to set load.
> - Added mmc_card_removable() to the condtion whcih checks
> if the card is eMMC or other card.
> - Rerturning error for unsupported voltagtes in
> sdhci_msm_start_signal_voltage_switch()
> - Moved setting ios.power_mode to mmc_alloc_host().
>
> Changes since V3:
> - Dropped reading of regulator load values from device tree.
> - Dropped documentaiton chagne.
> - Since only Vqmmc supply of eMMC would be kept On during suspend,
> setting load only for this regulator so that it can go to LPM.
> And since this Load reamins same, load value is hard-coded in the driver.
>
> Changes since V2:
> - Removed redundant log from sdhci_msm_set_vmmc.
> - Added the condition for skiping disabling of vqmmc for eMMC.
> - Updated logic such that, setting load for vqmmc only if
> it is kept ON.
> - Retained ack by Adrian for second patch.
> - Updated dt properties names as per Robs comments.
>
> Changes since V1:
> - Removed setting load for Vmmc regulator while turning it on/off.
> Instead setting the active load once during probe.
> - Simplified handlng of supplies for BUS_ON/OFF cases in shci_msm_handle_pwr_irq().
> - Moved common code out of switch case in sdhci_msm_start_signal_voltage_switch().
> - Updated variable name to sdhci_core_to_disable_vqmmc.
> - Updated pr_err logs to dev_err logs.
> Veerabhadrarao Badiganti (2):
> mmc: core: Set default power mode in mmc_alloc_host
> mmc: sdhci-msm: Use internal voltage control
>
> Vijay Viswanath (1):
> mmc: sdhci: Allow platform controlled voltage switching
>
> drivers/mmc/core/host.c | 1 +
> drivers/mmc/host/sdhci-msm.c | 206 +++++++++++++++++++++++++++++++++++++++++--
> drivers/mmc/host/sdhci.c | 32 ++++---
> drivers/mmc/host/sdhci.h | 1 +
> 4 files changed, 218 insertions(+), 22 deletions(-)
>
V5 applied for next (did some minor amendment to patch 2), thanks!
Kind regards
Uffe