Add support for eint IRQ when MSDC is used as an SDIO host. This
feature requires SDIO device support async IRQ function. With this
feature, SDIO host can be awakened by SDIO card in suspend state,
without additional pin.
MSDC driver will time-share the SDIO DAT1 pin. During suspend, MSDC
turn off clock and switch SDIO DAT1 pin to GPIO mode. And during
resume, switch GPIO function back to DAT1 mode then turn on clock.
Some device tree property should be added or modified in MSDC node
to support SDIO eint IRQ. Pinctrls named state_dat1 and state_eint
are mandatory. And cap-sdio-async-irq flag is necessary since this
feature depends on asynchronous interrupt:
&mmcX {
...
pinctrl-names = "default", "state_uhs", "state_eint",
"state_dat1";
...
pinctrl-2 = <&mmc2_pins_eint>;
pinctrl-3 = <&mmc2_pins_dat1>;
...
cap-sdio-async-irq;
...
};
Signed-off-by: Axe Yang <[email protected]>
Signed-off-by: Yong Mao <[email protected]>
---
drivers/mmc/host/mtk-sd.c | 124 +++++++++++++++++++++++++++++++++++---
1 file changed, 116 insertions(+), 8 deletions(-)
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 65037e1d7723..066616ddc88f 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
- * Copyright (c) 2014-2015 MediaTek Inc.
+ * Copyright (c) 2022 MediaTek Inc.
* Author: Chaotian.Jing <[email protected]>
*/
@@ -9,6 +9,7 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
+#include <linux/gpio/consumer.h>
#include <linux/iopoll.h>
#include <linux/ioport.h>
#include <linux/irq.h>
@@ -440,8 +441,12 @@ struct msdc_host {
struct pinctrl *pinctrl;
struct pinctrl_state *pins_default;
struct pinctrl_state *pins_uhs;
+ struct pinctrl_state *pins_eint;
+ struct pinctrl_state *pins_dat1;
struct delayed_work req_timeout;
int irq; /* host interrupt */
+ int eint_irq; /* device interrupt */
+ int sdio_irq_cnt; /* irq enable cnt */
struct reset_control *reset;
struct clk *src_clk; /* msdc source clock */
@@ -465,6 +470,7 @@ struct msdc_host {
bool hs400_tuning; /* hs400 mode online tuning */
bool internal_cd; /* Use internal card-detect logic */
bool cqhci; /* support eMMC hw cmdq */
+ bool sdio_eint_ready; /* Ready to support SDIO eint interrupt */
struct msdc_save_para save_para; /* used when gate HCLK */
struct msdc_tune_para def_tune_para; /* default tune setting */
struct msdc_tune_para saved_tune_para; /* tune result of CMD21/CMD19 */
@@ -1527,10 +1533,12 @@ static void msdc_enable_sdio_irq(struct mmc_host *mmc, int enb)
__msdc_enable_sdio_irq(host, enb);
spin_unlock_irqrestore(&host->lock, flags);
- if (enb)
- pm_runtime_get_noresume(host->dev);
- else
- pm_runtime_put_noidle(host->dev);
+ if (mmc->card && !mmc->card->cccr.enable_async_irq) {
+ if (enb)
+ pm_runtime_get_noresume(host->dev);
+ else
+ pm_runtime_put_noidle(host->dev);
+ }
}
static irqreturn_t msdc_cmdq_irq(struct msdc_host *host, u32 intsts)
@@ -2461,6 +2469,49 @@ static const struct mmc_host_ops mt_msdc_ops = {
.hw_reset = msdc_hw_reset,
};
+static irqreturn_t msdc_sdio_eint_irq(int irq, void *dev_id)
+{
+ struct msdc_host *host = dev_id;
+ struct mmc_host *mmc = mmc_from_priv(host);
+
+ spin_lock(&host->lock);
+ if (likely(host->sdio_irq_cnt > 0)) {
+ disable_irq_nosync(host->eint_irq);
+ disable_irq_wake(host->eint_irq);
+ host->sdio_irq_cnt--;
+ }
+ spin_unlock(&host->lock);
+
+ sdio_signal_irq(mmc);
+
+ return IRQ_HANDLED;
+}
+
+static int msdc_request_dat1_eint_irq(struct msdc_host *host)
+{
+ struct gpio_desc *desc;
+ int irq, ret;
+
+ desc = devm_gpiod_get(host->dev, "eint", GPIOD_IN);
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+
+ ret = gpiod_to_irq(desc);
+ if (ret < 0)
+ return ret;
+
+ irq = ret;
+ ret = devm_request_threaded_irq(host->dev, irq, NULL, msdc_sdio_eint_irq,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_NO_AUTOEN,
+ "sdio-eint", host);
+ if (ret)
+ return ret;
+
+ host->eint_irq = irq;
+
+ return 0;
+}
+
static const struct cqhci_host_ops msdc_cmdq_ops = {
.enable = msdc_cqe_enable,
.disable = msdc_cqe_disable,
@@ -2631,6 +2682,23 @@ static int msdc_drv_probe(struct platform_device *pdev)
goto host_free;
}
+ if (!(mmc->caps2 & MMC_CAP2_NO_SDIO) && (mmc->caps2 & MMC_CAP2_SDIO_ASYNC_IRQ)) {
+ /* Support for SDIO eint irq */
+ host->pins_eint = pinctrl_lookup_state(host->pinctrl, "state_eint");
+ if (IS_ERR(host->pins_eint)) {
+ dev_dbg(&pdev->dev, "Cannot find pinctrl eint!\n");
+ } else {
+ host->pins_dat1 = pinctrl_lookup_state(host->pinctrl, "state_dat1");
+ if (IS_ERR(host->pins_dat1)) {
+ ret = dev_err_probe(&pdev->dev, PTR_ERR(host->pins_dat1),
+ "Cannot find pinctrl dat1!\n");
+ goto host_free;
+ }
+
+ host->sdio_eint_ready = true;
+ }
+ }
+
msdc_of_property_parse(pdev, host);
host->dev = &pdev->dev;
@@ -2722,6 +2790,16 @@ static int msdc_drv_probe(struct platform_device *pdev)
if (ret)
goto release;
+ if (host->sdio_eint_ready) {
+ ret = msdc_request_dat1_eint_irq(host);
+ if (ret) {
+ dev_err(host->dev, "Failed to register data1 eint irq!\n");
+ goto release;
+ }
+
+ pinctrl_select_state(host->pinctrl, host->pins_dat1);
+ }
+
pm_runtime_set_active(host->dev);
pm_runtime_set_autosuspend_delay(host->dev, MTK_MMC_AUTOSUSPEND_DELAY);
pm_runtime_use_autosuspend(host->dev);
@@ -2841,16 +2919,31 @@ static void msdc_restore_reg(struct msdc_host *host)
static int __maybe_unused msdc_runtime_suspend(struct device *dev)
{
+ unsigned long flags;
struct mmc_host *mmc = dev_get_drvdata(dev);
struct msdc_host *host = mmc_priv(mmc);
msdc_save_reg(host);
+
+ if (host->sdio_eint_ready) {
+ disable_irq(host->irq);
+ pinctrl_select_state(host->pinctrl, host->pins_eint);
+ spin_lock_irqsave(&host->lock, flags);
+ if (host->sdio_irq_cnt == 0) {
+ enable_irq(host->eint_irq);
+ enable_irq_wake(host->eint_irq);
+ host->sdio_irq_cnt++;
+ }
+ sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
+ spin_unlock_irqrestore(&host->lock, flags);
+ }
msdc_gate_clock(host);
return 0;
}
static int __maybe_unused msdc_runtime_resume(struct device *dev)
{
+ unsigned long flags;
struct mmc_host *mmc = dev_get_drvdata(dev);
struct msdc_host *host = mmc_priv(mmc);
int ret;
@@ -2860,10 +2953,25 @@ static int __maybe_unused msdc_runtime_resume(struct device *dev)
return ret;
msdc_restore_reg(host);
+
+ if (host->sdio_eint_ready) {
+ spin_lock_irqsave(&host->lock, flags);
+ if (host->sdio_irq_cnt > 0) {
+ disable_irq_nosync(host->eint_irq);
+ disable_irq_wake(host->eint_irq);
+ host->sdio_irq_cnt--;
+ sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
+ } else {
+ sdr_clr_bits(host->base + MSDC_INTEN, MSDC_INTEN_SDIOIRQ);
+ }
+ spin_unlock_irqrestore(&host->lock, flags);
+ pinctrl_select_state(host->pinctrl, host->pins_uhs);
+ enable_irq(host->irq);
+ }
return 0;
}
-static int __maybe_unused msdc_suspend(struct device *dev)
+static int __maybe_unused msdc_suspend_noirq(struct device *dev)
{
struct mmc_host *mmc = dev_get_drvdata(dev);
int ret;
@@ -2877,13 +2985,13 @@ static int __maybe_unused msdc_suspend(struct device *dev)
return pm_runtime_force_suspend(dev);
}
-static int __maybe_unused msdc_resume(struct device *dev)
+static int __maybe_unused msdc_resume_noirq(struct device *dev)
{
return pm_runtime_force_resume(dev);
}
static const struct dev_pm_ops msdc_dev_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(msdc_suspend, msdc_resume)
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(msdc_suspend_noirq, msdc_resume_noirq)
SET_RUNTIME_PM_OPS(msdc_runtime_suspend, msdc_runtime_resume, NULL)
};
--
2.25.1
On Wed, Jan 19, 2022 at 06:32:12PM +0800, Axe Yang wrote:
> Add support for eint IRQ when MSDC is used as an SDIO host. This
> feature requires SDIO device support async IRQ function. With this
> feature, SDIO host can be awakened by SDIO card in suspend state,
> without additional pin.
>
> MSDC driver will time-share the SDIO DAT1 pin. During suspend, MSDC
> turn off clock and switch SDIO DAT1 pin to GPIO mode. And during
> resume, switch GPIO function back to DAT1 mode then turn on clock.
>
> Some device tree property should be added or modified in MSDC node
> to support SDIO eint IRQ. Pinctrls named state_dat1 and state_eint
> are mandatory. And cap-sdio-async-irq flag is necessary since this
> feature depends on asynchronous interrupt:
> &mmcX {
> ...
> pinctrl-names = "default", "state_uhs", "state_eint",
> "state_dat1";
> ...
> pinctrl-2 = <&mmc2_pins_eint>;
> pinctrl-3 = <&mmc2_pins_dat1>;
> ...
> cap-sdio-async-irq;
> ...
> };
>
> Signed-off-by: Axe Yang <[email protected]>
The submitters SoB must be last among all SoB tags. Please, read Submitting
Patches document carefully.
> Signed-off-by: Yong Mao <[email protected]>
Who is they, why their SoB appeared here?
...
> /*
> - * Copyright (c) 2014-2015 MediaTek Inc.
> + * Copyright (c) 2022 MediaTek Inc.
This doesn't feel right. Why did you remove old years?
> * Author: Chaotian.Jing <[email protected]>
> */
...
> + desc = devm_gpiod_get(host->dev, "eint", GPIOD_IN);
> + if (IS_ERR(desc))
> + return PTR_ERR(desc);
> + ret = gpiod_to_irq(desc);
> + if (ret < 0)
> + return ret;
> +
> + irq = ret;
Since both of them are local variables and there is no specific use of the
returned value, I believe it's fine just to
irq = gpiod_to_irq(desc);
...
Hmm... I was wondering if you can use fwnode_irq_get_byname().
Ah, it's not (yet) in upstream.
...
> static int __maybe_unused msdc_runtime_suspend(struct device *dev)
> {
> + unsigned long flags;
Can you keep reversed xmas tree order?
> struct mmc_host *mmc = dev_get_drvdata(dev);
> struct msdc_host *host = mmc_priv(mmc);
(it means to add new variable here)
> return 0;
> }
...
> static int __maybe_unused msdc_runtime_resume(struct device *dev)
> {
> + unsigned long flags;
Ditto.
> struct mmc_host *mmc = dev_get_drvdata(dev);
> struct msdc_host *host = mmc_priv(mmc);
> int ret;
> return 0;
> }
--
With Best Regards,
Andy Shevchenko
On Wed, 2022-01-19 at 21:47 +0200, Andy Shevchenko wrote:
> On Wed, Jan 19, 2022 at 06:32:12PM +0800, Axe Yang wrote:
> > Add support for eint IRQ when MSDC is used as an SDIO host. This
> > feature requires SDIO device support async IRQ function. With this
> > feature, SDIO host can be awakened by SDIO card in suspend state,
> > without additional pin.
> >
> > MSDC driver will time-share the SDIO DAT1 pin. During suspend, MSDC
> > turn off clock and switch SDIO DAT1 pin to GPIO mode. And during
> > resume, switch GPIO function back to DAT1 mode then turn on clock.
> >
> > Some device tree property should be added or modified in MSDC node
> > to support SDIO eint IRQ. Pinctrls named state_dat1 and state_eint
> > are mandatory. And cap-sdio-async-irq flag is necessary since this
> > feature depends on asynchronous interrupt:
> > &mmcX {
> > ...
> > pinctrl-names = "default", "state_uhs",
> > "state_eint",
> > "state_dat1";
> > ...
> > pinctrl-2 = <&mmc2_pins_eint>;
> > pinctrl-3 = <&mmc2_pins_dat1>;
> > ...
> > cap-sdio-async-irq;
> > ...
> > };
> >
> > Signed-off-by: Axe Yang <[email protected]>
>
> The submitters SoB must be last among all SoB tags. Please, read
> Submitting
> Patches document carefully.
>
> > Signed-off-by: Yong Mao <[email protected]>
>
> Who is they, why their SoB appeared here?
>
Yong Mao is the co-developer of this patch, I will reorder the SoB
chains.
> ...
>
> > /*
> > - * Copyright (c) 2014-2015 MediaTek Inc.
> > + * Copyright (c) 2022 MediaTek Inc.
>
> This doesn't feel right. Why did you remove old years?
I should keep the publish year 2014 of this driver.
But I still think range 2014-2022 is the most appropriate way to change
the copyright time. Over these years, mediatek is keeping maintaining
this driver continuously. What do you think?
>
> > * Author: Chaotian.Jing <[email protected]>
> > */
>
> ...
>
> > + desc = devm_gpiod_get(host->dev, "eint", GPIOD_IN);
> > + if (IS_ERR(desc))
> > + return PTR_ERR(desc);
> > + ret = gpiod_to_irq(desc);
> > + if (ret < 0)
> > + return ret;
> > +
> > + irq = ret;
>
> Since both of them are local variables and there is no specific use
> of the
> returned value, I believe it's fine just to
>
> irq = gpiod_to_irq(desc);
> ...
I agree, will fix in next version.
> Hmm... I was wondering if you can use fwnode_irq_get_byname().
> Ah, it's not (yet) in upstream.
>
> ...
>
> > static int __maybe_unused msdc_runtime_suspend(struct device *dev)
> > {
> > + unsigned long flags;
>
> Can you keep reversed xmas tree order?
>
> > struct mmc_host *mmc = dev_get_drvdata(dev);
> > struct msdc_host *host = mmc_priv(mmc);
>
> (it means to add new variable here)
Will fix it in next version.
>
> > return 0;
> > }
>
> ...
>
> > static int __maybe_unused msdc_runtime_resume(struct device *dev)
> > {
> > + unsigned long flags;
>
> Ditto.
Will fix it in next version.
>
> > struct mmc_host *mmc = dev_get_drvdata(dev);
> > struct msdc_host *host = mmc_priv(mmc);
> > int ret;
> > return 0;
> > }
>
--
Best Regard,
Axe Yang
On Thu, Jan 20, 2022 at 01:34:08PM +0800, Axe Yang wrote:
> On Wed, 2022-01-19 at 21:47 +0200, Andy Shevchenko wrote:
> > On Wed, Jan 19, 2022 at 06:32:12PM +0800, Axe Yang wrote:
...
> > > Signed-off-by: Axe Yang <[email protected]>
> >
> > The submitters SoB must be last among all SoB tags. Please, read
> > Submitting
> > Patches document carefully.
> >
> > > Signed-off-by: Yong Mao <[email protected]>
> >
> > Who is they, why their SoB appeared here?
>
> Yong Mao is the co-developer of this patch, I will reorder the SoB
> chains.
And you will need to add a corresponding tag.
...
> > > - * Copyright (c) 2014-2015 MediaTek Inc.
> > > + * Copyright (c) 2022 MediaTek Inc.
> >
> > This doesn't feel right. Why did you remove old years?
>
> I should keep the publish year 2014 of this driver.
> But I still think range 2014-2022 is the most appropriate way to change
> the copyright time. Over these years, mediatek is keeping maintaining
> this driver continuously. What do you think?
I guess I already showed my opinion on the topic? The common sense tells
me that it should be as simple as '2014-2015,2022' there.
--
With Best Regards,
Andy Shevchenko