2022-03-08 00:48:38

by Brian Norris

Subject: [PATCH v3 00/15] rk3399: Clean up and enable DDR DVFS

This series covers 2 primary tasks:

1) Resubmit prior work:

[RESEND PATCH v5 3/4] arm64: dts: rockchip: Enable dmc and dfi nodes on gru.
https://lore.kernel.org/lkml/[email protected]/
[RESEND PATCH v5 2/4] arm64: dts: rk3399: Add dfi and dmc nodes.
https://lore.kernel.org/lkml/[email protected]/

This series was partially merged a while back, but the remaining 2
patches were blocked mostly on stylistic grounds (alpha/numerical
ordering).

2) Integrate many updates, bugfixes, and clarifications that were done
by Rockchip and Google engineers when first launching this platform.
Many of these were not integrated in the earlier series (e.g., the OPPs
changed before production; earlier patchsets used pre-production
numbers).

Along the way, it seemed worthwhile to convert the binding docs to a
schema. Among other reasons, it actually helped catch several errors and
omissions in translation between downstream device trees and the version
that actually landed upstream.

See the patches for further details.

Regards,
Brian

Changes in v3:
* Add |maxItems| for devfreq-events
* Improve deprecation notes
* Collect some Acked/Reviewed tags

Changes in v2:
* Fix yamllint issues
* Adapt to various review comments (use of *-hz, hyphens, node naming)
* Add a few new bugfixes
* Add some new properties (ported from downstream kernels) required for
stability
* Convert more properties from "cycles" to "nanoseconds"

Brian Norris (13):
dt-bindings: devfreq: rk3399_dmc: Convert to YAML
dt-bindings: devfreq: rk3399_dmc: Deprecate unused/redundant
properties
dt-bindings: devfreq: rk3399_dmc: Fix Hz units
dt-bindings: devfreq: rk3399_dmc: Specify idle params in nanoseconds
dt-bindings: devfreq: rk3399_dmc: Add more disable-freq properties
PM / devfreq: rk3399_dmc: Drop undocumented ondemand DT props
PM / devfreq: rk3399_dmc: Drop excess timing properties
PM / devfreq: rk3399_dmc: Use bitfield macro definitions for ODT_PD
PM / devfreq: rk3399_dmc: Support new disable-freq properties
PM / devfreq: rk3399_dmc: Support new *-ns properties
PM / devfreq: rk3399_dmc: Disable edev on remove()
PM / devfreq: rk3399_dmc: Use devm_pm_opp_of_add_table()
PM / devfreq: rk3399_dmc: Avoid static (reused) profile

Lin Huang (2):
arm64: dts: rk3399: Add dfi and dmc nodes
arm64: dts: rockchip: Enable dmc and dfi nodes on gru

.../bindings/devfreq/rk3399_dmc.txt | 212 ----------
.../bindings/devfreq/rk3399_dmc.yaml | 371 ++++++++++++++++++
.../dts/rockchip/rk3399-gru-chromebook.dtsi | 7 +
.../boot/dts/rockchip/rk3399-gru-scarlet.dtsi | 12 +
arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi | 28 ++
.../boot/dts/rockchip/rk3399-op1-opp.dtsi | 25 ++
arch/arm64/boot/dts/rockchip/rk3399.dtsi | 19 +
drivers/devfreq/rk3399_dmc.c | 299 +++++++-------
8 files changed, 596 insertions(+), 377 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
create mode 100644 Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml

--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 02:50:41

by Brian Norris

Subject: [PATCH v3 09/15] PM / devfreq: rk3399_dmc: Support new disable-freq properties

Implement the newly-defined properties to allow disabling certain
power-saving-at-idle features at higher frequencies.

This is a rewritten version of work by Lin Huang <[email protected]>.

Signed-off-by: Brian Norris <[email protected]>
---

(no changes since v1)

drivers/devfreq/rk3399_dmc.c | 51 +++++++++++++++++++++++++++++++++---
1 file changed, 47 insertions(+), 4 deletions(-)

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index c4efbc15cbb1..fc740c1f6747 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -55,6 +55,12 @@ struct rk3399_dmcfreq {
unsigned int ddr3_odt_dis_freq;
unsigned int lpddr3_odt_dis_freq;
unsigned int lpddr4_odt_dis_freq;
+
+ unsigned int pd_idle_dis_freq;
+ unsigned int sr_idle_dis_freq;
+ unsigned int sr_mc_gate_idle_dis_freq;
+ unsigned int srpd_lite_idle_dis_freq;
+ unsigned int standby_idle_dis_freq;
};

static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
@@ -81,8 +87,25 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
mutex_lock(&dmcfreq->lock);

if (dmcfreq->regmap_pmu) {
+ unsigned int odt_pd_arg0 = dmcfreq->odt_pd_arg0;
+ unsigned int odt_pd_arg1 = dmcfreq->odt_pd_arg1;
unsigned int odt_pd_arg2 = 0;

+ if (target_rate >= dmcfreq->sr_idle_dis_freq)
+ odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_SR_IDLE;
+
+ if (target_rate >= dmcfreq->sr_mc_gate_idle_dis_freq)
+ odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE;
+
+ if (target_rate >= dmcfreq->standby_idle_dis_freq)
+ odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_STANDBY_IDLE;
+
+ if (target_rate >= dmcfreq->pd_idle_dis_freq)
+ odt_pd_arg1 &= ~RK3399_SET_ODT_PD_1_PD_IDLE;
+
+ if (target_rate >= dmcfreq->srpd_lite_idle_dis_freq)
+ odt_pd_arg1 &= ~RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE;
+
if (target_rate >= dmcfreq->odt_dis_freq)
odt_pd_arg2 |= RK3399_SET_ODT_PD_2_ODT_ENABLE;

@@ -91,10 +114,9 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
* (power-down) timings and to enable or disable the
* ODT (on-die termination) resistors.
*/
- arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, dmcfreq->odt_pd_arg0,
- dmcfreq->odt_pd_arg1,
- ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD,
- odt_pd_arg2, 0, 0, 0, &res);
+ arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, odt_pd_arg0, odt_pd_arg1,
+ ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD, odt_pd_arg2,
+ 0, 0, 0, &res);
}

/*
@@ -230,6 +252,16 @@ static int rk3399_dmcfreq_of_props(struct rk3399_dmcfreq *data,
{
int ret = 0;

+ /*
+ * These are all optional, and serve as minimum bounds. Give them large
+ * (i.e., never "disabled") values if the DT doesn't specify one.
+ */
+ data->pd_idle_dis_freq =
+ data->sr_idle_dis_freq =
+ data->sr_mc_gate_idle_dis_freq =
+ data->srpd_lite_idle_dis_freq =
+ data->standby_idle_dis_freq = UINT_MAX;
+
ret |= of_property_read_u32(np, "rockchip,pd_idle",
&data->pd_idle);
ret |= of_property_read_u32(np, "rockchip,sr_idle",
@@ -247,6 +279,17 @@ static int rk3399_dmcfreq_of_props(struct rk3399_dmcfreq *data,
ret |= of_property_read_u32(np, "rockchip,lpddr4_odt_dis_freq",
&data->lpddr4_odt_dis_freq);

+ ret |= of_property_read_u32(np, "rockchip,pd-idle-dis-freq-hz",
+ &data->pd_idle_dis_freq);
+ ret |= of_property_read_u32(np, "rockchip,sr-idle-dis-freq-hz",
+ &data->sr_idle_dis_freq);
+ ret |= of_property_read_u32(np, "rockchip,sr-mc-gate-idle-dis-freq-hz",
+ &data->sr_mc_gate_idle_dis_freq);
+ ret |= of_property_read_u32(np, "rockchip,srpd-lite-idle-dis-freq-hz",
+ &data->srpd_lite_idle_dis_freq);
+ ret |= of_property_read_u32(np, "rockchip,standby-idle-dis-freq-hz",
+ &data->standby_idle_dis_freq);
+
return ret;
}

--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 03:00:12

by Brian Norris

Subject: [PATCH v3 04/15] dt-bindings: devfreq: rk3399_dmc: Specify idle params in nanoseconds

It's inefficient to use the same number of cycles for all OPPs, since
lower frequencies make for longer idle times. Let's specify the idle
time instead, so software can pick the optimal number of cycles on its
own.

NB: these bindings aren't used anywhere yet.

Signed-off-by: Brian Norris <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
---

Changes in v3:
* Add Reviewed-by

Changes in v2:
* New patch

.../bindings/devfreq/rk3399_dmc.yaml | 50 +++++++++++++++++--
1 file changed, 45 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
index 2904ae4115f3..6a33a7b44741 100644
--- a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
+++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
@@ -56,42 +56,52 @@ properties:
being used.

rockchip,pd_idle:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
Configure the PD_IDLE value. Defines the power-down idle period in which
memories are placed into power-down mode if bus is idle for PD_IDLE DFI
clock cycles.
+ See also rockchip,pd-idle-ns.

rockchip,sr_idle:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
Configure the SR_IDLE value. Defines the self-refresh idle period in
which memories are placed into self-refresh mode if bus is idle for
SR_IDLE * 1024 DFI clock cycles (DFI clocks freq is half of DRAM clock).
Default value is "0".
+ See also rockchip,sr-idle-ns.

rockchip,sr_mc_gate_idle:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
Defines the memory self-refresh and controller clock gating idle period.
Memories are placed into self-refresh mode and memory controller clock
arg gating started if bus is idle for sr_mc_gate_idle*1024 DFI clock
cycles.
+ See also rockchip,sr-mc-gate-idle-ns.

rockchip,srpd_lite_idle:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
Defines the self-refresh power down idle period in which memories are
placed into self-refresh power down mode if bus is idle for
srpd_lite_idle * 1024 DFI clock cycles. This parameter is for LPDDR4
only.
+ See also rockchip,srpd-lite-idle-ns.

rockchip,standby_idle:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
Defines the standby idle period in which memories are placed into
self-refresh mode. The controller, pi, PHY and DRAM clock will be gated
if bus is idle for standby_idle * DFI clock cycles.
+ See also rockchip,standby-idle-ns.

rockchip,dram_dll_dis_freq:
deprecated: true
@@ -260,6 +270,36 @@ properties:
When the DRAM type is LPDDR4, this parameter defines the PHY side ODT
strength. Default value is 60.

+ rockchip,pd-idle-ns:
+ description:
+ Configure the PD_IDLE value in nanoseconds. Defines the power-down idle
+ period in which memories are placed into power-down mode if bus is idle
+ for PD_IDLE nanoseconds.
+
+ rockchip,sr-idle-ns:
+ description:
+ Configure the SR_IDLE value in nanoseconds. Defines the self-refresh idle
+ period in which memories are placed into self-refresh mode if bus is idle
+ for SR_IDLE nanoseconds. Default value is "0".
+
+ rockchip,sr-mc-gate-idle-ns:
+ description:
+ Defines the memory self-refresh and controller clock gating idle period in nanoseconds.
+ Memories are placed into self-refresh mode and memory controller clock
+ arg gating started if bus is idle for sr_mc_gate_idle nanoseconds.
+
+ rockchip,srpd-lite-idle-ns:
+ description:
+ Defines the self-refresh power down idle period in which memories are
+ placed into self-refresh power down mode if bus is idle for
+ srpd_lite_idle nanoseonds. This parameter is for LPDDR4 only.
+
+ rockchip,standby-idle-ns:
+ description:
+ Defines the standby idle period in which memories are placed into
+ self-refresh mode. The controller, pi, PHY and DRAM clock will be gated
+ if bus is idle for standby_idle nanoseconds.
+
required:
- compatible
- devfreq-events
@@ -283,11 +323,11 @@ examples:
clock-names = "dmc_clk";
operating-points-v2 = <&dmc_opp_table>;
center-supply = <&ppvar_centerlogic>;
- rockchip,pd_idle = <0x40>;
- rockchip,sr_idle = <0x2>;
- rockchip,sr_mc_gate_idle = <0x3>;
- rockchip,srpd_lite_idle = <0x4>;
- rockchip,standby_idle = <0x2000>;
+ rockchip,pd-idle-ns = <160>;
+ rockchip,sr-idle-ns = <10240>;
+ rockchip,sr-mc-gate-idle-ns = <40960>;
+ rockchip,srpd-lite-idle-ns = <61440>;
+ rockchip,standby-idle-ns = <81920>;
rockchip,ddr3_odt_dis_freq = <333000000>;
rockchip,lpddr3_odt_dis_freq = <333000000>;
rockchip,lpddr4_odt_dis_freq = <333000000>;
--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 05:53:30

by Brian Norris

Subject: [PATCH v3 13/15] PM / devfreq: rk3399_dmc: Disable edev on remove()

Otherwise we hit an unablanced enable-count when unbinding the DFI
device:

[ 1279.659119] ------------[ cut here ]------------
[ 1279.659179] WARNING: CPU: 2 PID: 5638 at drivers/devfreq/devfreq-event.c:360 devfreq_event_remove_edev+0x84/0x8c
...
[ 1279.659352] Hardware name: Google Kevin (DT)
[ 1279.659363] pstate: 80400005 (Nzcv daif +PAN -UAO -TCO BTYPE=--)
[ 1279.659371] pc : devfreq_event_remove_edev+0x84/0x8c
[ 1279.659380] lr : devm_devfreq_event_release+0x1c/0x28
...
[ 1279.659571] Call trace:
[ 1279.659582] devfreq_event_remove_edev+0x84/0x8c
[ 1279.659590] devm_devfreq_event_release+0x1c/0x28
[ 1279.659602] release_nodes+0x1cc/0x244
[ 1279.659611] devres_release_all+0x44/0x60
[ 1279.659621] device_release_driver_internal+0x11c/0x1ac
[ 1279.659629] device_driver_detach+0x20/0x2c
[ 1279.659641] unbind_store+0x7c/0xb0
[ 1279.659650] drv_attr_store+0x2c/0x40
[ 1279.659663] sysfs_kf_write+0x44/0x58
[ 1279.659672] kernfs_fop_write_iter+0xf4/0x190
[ 1279.659684] vfs_write+0x2b0/0x2e4
[ 1279.659693] ksys_write+0x80/0xec
[ 1279.659701] __arm64_sys_write+0x24/0x30
[ 1279.659714] el0_svc_common+0xf0/0x1d8
[ 1279.659724] do_el0_svc_compat+0x28/0x3c
[ 1279.659738] el0_svc_compat+0x10/0x1c
[ 1279.659746] el0_sync_compat_handler+0xa8/0xcc
[ 1279.659758] el0_sync_compat+0x188/0x1c0
[ 1279.659768] ---[ end trace cec200e5094155b4 ]---

Signed-off-by: Brian Norris <[email protected]>
---

(no changes since v2)

Changes in v2:
- New patch

drivers/devfreq/rk3399_dmc.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index f778564cab49..fca9fcbd4249 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -452,6 +452,8 @@ static int rk3399_dmcfreq_remove(struct platform_device *pdev)
{
struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(&pdev->dev);

+ devfreq_event_disable_edev(dmcfreq->edev);
+
/*
* Before remove the opp table we need to unregister the opp notifier.
*/
--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 06:57:37

by Brian Norris

Subject: [PATCH v3 14/15] PM / devfreq: rk3399_dmc: Use devm_pm_opp_of_add_table()

This simplifies error-cleanup and remove().

Signed-off-by: Brian Norris <[email protected]>
---

(no changes since v2)

Changes in v2:
- New patch

drivers/devfreq/rk3399_dmc.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index fca9fcbd4249..9615658d04ae 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -401,7 +401,7 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
* We add a devfreq driver to our parent since it has a device tree node
* with operating points.
*/
- if (dev_pm_opp_of_add_table(dev)) {
+ if (devm_pm_opp_of_add_table(dev)) {
dev_err(dev, "Invalid operating-points in device tree.\n");
ret = -EINVAL;
goto err_edev;
@@ -415,7 +415,7 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
opp = devfreq_recommended_opp(dev, &data->rate, 0);
if (IS_ERR(opp)) {
ret = PTR_ERR(opp);
- goto err_free_opp;
+ goto err_edev;
}

data->rate = dev_pm_opp_get_freq(opp);
@@ -430,7 +430,7 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
&data->ondemand_data);
if (IS_ERR(data->devfreq)) {
ret = PTR_ERR(data->devfreq);
- goto err_free_opp;
+ goto err_edev;
}

devm_devfreq_register_opp_notifier(dev, data->devfreq);
@@ -440,8 +440,6 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)

return 0;

-err_free_opp:
- dev_pm_opp_of_remove_table(&pdev->dev);
err_edev:
devfreq_event_disable_edev(data->edev);

@@ -454,12 +452,6 @@ static int rk3399_dmcfreq_remove(struct platform_device *pdev)

devfreq_event_disable_edev(dmcfreq->edev);

- /*
- * Before remove the opp table we need to unregister the opp notifier.
- */
- devm_devfreq_unregister_opp_notifier(dmcfreq->dev, dmcfreq->devfreq);
- dev_pm_opp_of_remove_table(dmcfreq->dev);
-
return 0;
}

--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 08:10:35

by Brian Norris

Subject: [PATCH v3 10/15] PM / devfreq: rk3399_dmc: Support new *-ns properties

We want to keep the idle time fixed, so compute based on the current DDR
frequency.

The old properties were deprecated and never used, so we can safely drop
them from the driver.

This is a rewritten version of work by Lin Huang <[email protected]>.

Signed-off-by: Brian Norris <[email protected]>
---

(no changes since v2)

Changes in v2:
- New patch

drivers/devfreq/rk3399_dmc.c | 85 +++++++++++++++++++++---------------
1 file changed, 50 insertions(+), 35 deletions(-)

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index fc740c1f6747..f778564cab49 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -24,6 +24,8 @@
#include <soc/rockchip/rk3399_grf.h>
#include <soc/rockchip/rockchip_sip.h>

+#define NS_TO_CYCLE(NS, MHz) (((NS) * (MHz)) / NSEC_PER_USEC)
+
#define RK3399_SET_ODT_PD_0_SR_IDLE GENMASK(7, 0)
#define RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE GENMASK(15, 8)
#define RK3399_SET_ODT_PD_0_STANDBY_IDLE GENMASK(31, 16)
@@ -45,13 +47,12 @@ struct rk3399_dmcfreq {
unsigned long rate, target_rate;
unsigned long volt, target_volt;
unsigned int odt_dis_freq;
- int odt_pd_arg0, odt_pd_arg1;

- unsigned int pd_idle;
- unsigned int sr_idle;
- unsigned int sr_mc_gate_idle;
- unsigned int srpd_lite_idle;
- unsigned int standby_idle;
+ unsigned int pd_idle_ns;
+ unsigned int sr_idle_ns;
+ unsigned int sr_mc_gate_idle_ns;
+ unsigned int srpd_lite_idle_ns;
+ unsigned int standby_idle_ns;
unsigned int ddr3_odt_dis_freq;
unsigned int lpddr3_odt_dis_freq;
unsigned int lpddr4_odt_dis_freq;
@@ -70,9 +71,14 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
struct dev_pm_opp *opp;
unsigned long old_clk_rate = dmcfreq->rate;
unsigned long target_volt, target_rate;
+ unsigned int ddrcon_mhz;
struct arm_smccc_res res;
int err;

+ u32 odt_pd_arg0 = 0;
+ u32 odt_pd_arg1 = 0;
+ u32 odt_pd_arg2 = 0;
+
opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(opp))
return PTR_ERR(opp);
@@ -86,11 +92,35 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,

mutex_lock(&dmcfreq->lock);

- if (dmcfreq->regmap_pmu) {
- unsigned int odt_pd_arg0 = dmcfreq->odt_pd_arg0;
- unsigned int odt_pd_arg1 = dmcfreq->odt_pd_arg1;
- unsigned int odt_pd_arg2 = 0;
+ /*
+ * Some idle parameters may be based on the DDR controller clock, which
+ * is half of the DDR frequency.
+ * pd_idle and standby_idle are based on the controller clock cycle.
+ * sr_idle_cycle, sr_mc_gate_idle_cycle, and srpd_lite_idle_cycle
+ * are based on the 1024 controller clock cycle
+ */
+ ddrcon_mhz = target_rate / USEC_PER_SEC / 2;
+
+ u32p_replace_bits(&odt_pd_arg1,
+ NS_TO_CYCLE(dmcfreq->pd_idle_ns, ddrcon_mhz),
+ RK3399_SET_ODT_PD_1_PD_IDLE);
+ u32p_replace_bits(&odt_pd_arg0,
+ NS_TO_CYCLE(dmcfreq->standby_idle_ns, ddrcon_mhz),
+ RK3399_SET_ODT_PD_0_STANDBY_IDLE);
+ u32p_replace_bits(&odt_pd_arg0,
+ DIV_ROUND_UP(NS_TO_CYCLE(dmcfreq->sr_idle_ns,
+ ddrcon_mhz), 1024),
+ RK3399_SET_ODT_PD_0_SR_IDLE);
+ u32p_replace_bits(&odt_pd_arg0,
+ DIV_ROUND_UP(NS_TO_CYCLE(dmcfreq->sr_mc_gate_idle_ns,
+ ddrcon_mhz), 1024),
+ RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE);
+ u32p_replace_bits(&odt_pd_arg1,
+ DIV_ROUND_UP(NS_TO_CYCLE(dmcfreq->srpd_lite_idle_ns,
+ ddrcon_mhz), 1024),
+ RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE);

+ if (dmcfreq->regmap_pmu) {
if (target_rate >= dmcfreq->sr_idle_dis_freq)
odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_SR_IDLE;

@@ -262,16 +292,16 @@ static int rk3399_dmcfreq_of_props(struct rk3399_dmcfreq *data,
data->srpd_lite_idle_dis_freq =
data->standby_idle_dis_freq = UINT_MAX;

- ret |= of_property_read_u32(np, "rockchip,pd_idle",
- &data->pd_idle);
- ret |= of_property_read_u32(np, "rockchip,sr_idle",
- &data->sr_idle);
- ret |= of_property_read_u32(np, "rockchip,sr_mc_gate_idle",
- &data->sr_mc_gate_idle);
- ret |= of_property_read_u32(np, "rockchip,srpd_lite_idle",
- &data->srpd_lite_idle);
- ret |= of_property_read_u32(np, "rockchip,standby_idle",
- &data->standby_idle);
+ ret |= of_property_read_u32(np, "rockchip,pd-idle-ns",
+ &data->pd_idle_ns);
+ ret |= of_property_read_u32(np, "rockchip,sr-idle-ns",
+ &data->sr_idle_ns);
+ ret |= of_property_read_u32(np, "rockchip,sr-mc-gate-idle-ns",
+ &data->sr_mc_gate_idle_ns);
+ ret |= of_property_read_u32(np, "rockchip,srpd-lite-idle-ns",
+ &data->srpd_lite_idle_ns);
+ ret |= of_property_read_u32(np, "rockchip,standby-idle-ns",
+ &data->standby_idle_ns);
ret |= of_property_read_u32(np, "rockchip,ddr3_odt_dis_freq",
&data->ddr3_odt_dis_freq);
ret |= of_property_read_u32(np, "rockchip,lpddr3_odt_dis_freq",
@@ -367,21 +397,6 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
ROCKCHIP_SIP_CONFIG_DRAM_INIT,
0, 0, 0, 0, &res);

- /*
- * In TF-A there is a platform SIP call to set the PD (power-down)
- * timings and to enable or disable the ODT (on-die termination).
- */
- data->odt_pd_arg0 =
- FIELD_PREP(RK3399_SET_ODT_PD_0_SR_IDLE, data->sr_idle) |
- FIELD_PREP(RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE,
- data->sr_mc_gate_idle) |
- FIELD_PREP(RK3399_SET_ODT_PD_0_STANDBY_IDLE,
- data->standby_idle);
- data->odt_pd_arg1 =
- FIELD_PREP(RK3399_SET_ODT_PD_1_PD_IDLE, data->pd_idle) |
- FIELD_PREP(RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE,
- data->srpd_lite_idle);
-
/*
* We add a devfreq driver to our parent since it has a device tree node
* with operating points.
--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 09:34:04

by Brian Norris

Subject: [PATCH v3 02/15] dt-bindings: devfreq: rk3399_dmc: Deprecate unused/redundant properties

These DRAM configuration properties are all handled in ARM Trusted
Firmware (and have been since the early days of this SoC), and there are
no in-tree users of the DMC binding yet. It's better to just defer to
firmware instead of maintaining this large list of properties.

There's also some confusion about units: many of these are specified in
MHz, but the downstream users and driver code are treating them as Hz, I
believe. Rather than straighten all that out, I just drop them.

Signed-off-by: Brian Norris <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
* Add Reviewed-by tags

---

Changes in v3:
* Add Reviewed-by

.../bindings/devfreq/rk3399_dmc.yaml | 42 +++++++++----------
1 file changed, 21 insertions(+), 21 deletions(-)

diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
index ddddddc5c6fb..4ca43b76ed51 100644
--- a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
+++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
@@ -47,6 +47,7 @@ properties:
finishes, a DCF interrupt is triggered.

rockchip,ddr3_speed_bin:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
For values, reference include/dt-bindings/clock/rk3399-ddr.h. Selects the
@@ -93,6 +94,7 @@ properties:
if bus is idle for standby_idle * DFI clock cycles.

rockchip,dram_dll_dis_freq:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description: |
Defines the DDR3 DLL bypass frequency in MHz. When DDR frequency is less
@@ -100,6 +102,7 @@ properties:
Note: if DLL was bypassed, the odt will also stop working.

rockchip,phy_dll_dis_freq:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description: |
Defines the PHY dll bypass frequency in MHz (Mega Hz). When DDR frequency
@@ -107,6 +110,7 @@ properties:
Note: PHY DLL and PHY ODT are independent.

rockchip,auto_pd_dis_freq:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
Defines the auto PD disable frequency in MHz.
@@ -120,18 +124,21 @@ properties:
disabled.

rockchip,ddr3_drv:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is DDR3, this parameter defines the DRAM side drive
strength in ohms. Default value is 40.

rockchip,ddr3_odt:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is DDR3, this parameter defines the DRAM side ODT
strength in ohms. Default value is 120.

rockchip,phy_ddr3_ca_drv:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is DDR3, this parameter defines the phy side CA line
@@ -139,12 +146,14 @@ properties:
Default value is 40.

rockchip,phy_ddr3_dq_drv:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is DDR3, this parameter defines the PHY side DQ line
(including DQS/DQ/DM line) drive strength. Default value is 40.

rockchip,phy_ddr3_odt:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is DDR3, this parameter defines the PHY side ODT
@@ -159,18 +168,21 @@ properties:
disabled.

rockchip,lpddr3_drv:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is LPDDR3, this parameter defines the DRAM side drive
strength in ohms. Default value is 34.

rockchip,lpddr3_odt:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is LPDDR3, this parameter defines the DRAM side ODT
strength in ohms. Default value is 240.

rockchip,phy_lpddr3_ca_drv:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is LPDDR3, this parameter defines the PHY side CA line
@@ -178,12 +190,14 @@ properties:
Default value is 40.

rockchip,phy_lpddr3_dq_drv:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is LPDDR3, this parameter defines the PHY side DQ line
(including DQS/DQ/DM line) drive strength. Default value is 40.

rockchip,phy_lpddr3_odt:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When dram type is LPDDR3, this parameter define the phy side odt
@@ -198,42 +212,49 @@ properties:
disabled.

rockchip,lpddr4_drv:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is LPDDR4, this parameter defines the DRAM side drive
strength in ohms. Default value is 60.

rockchip,lpddr4_dq_odt:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is LPDDR4, this parameter defines the DRAM side ODT on
DQS/DQ line strength in ohms. Default value is 40.

rockchip,lpddr4_ca_odt:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is LPDDR4, this parameter defines the DRAM side ODT on
CA line strength in ohms. Default value is 40.

rockchip,phy_lpddr4_ca_drv:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is LPDDR4, this parameter defines the PHY side CA line
(including command address line) drive strength. Default value is 40.

rockchip,phy_lpddr4_ck_cs_drv:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is LPDDR4, this parameter defines the PHY side clock
line and CS line drive strength. Default value is 80.

rockchip,phy_lpddr4_dq_drv:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is LPDDR4, this parameter defines the PHY side DQ line
(including DQS/DQ/DM line) drive strength. Default value is 80.

rockchip,phy_lpddr4_odt:
+ deprecated: true
$ref: /schemas/types.yaml#/definitions/uint32
description:
When the DRAM type is LPDDR4, this parameter defines the PHY side ODT
@@ -262,33 +283,12 @@ examples:
clock-names = "dmc_clk";
operating-points-v2 = <&dmc_opp_table>;
center-supply = <&ppvar_centerlogic>;
- rockchip,ddr3_speed_bin = <21>;
rockchip,pd_idle = <0x40>;
rockchip,sr_idle = <0x2>;
rockchip,sr_mc_gate_idle = <0x3>;
rockchip,srpd_lite_idle = <0x4>;
rockchip,standby_idle = <0x2000>;
- rockchip,dram_dll_dis_freq = <300>;
- rockchip,phy_dll_dis_freq = <125>;
- rockchip,auto_pd_dis_freq = <666>;
rockchip,ddr3_odt_dis_freq = <333>;
- rockchip,ddr3_drv = <40>;
- rockchip,ddr3_odt = <120>;
- rockchip,phy_ddr3_ca_drv = <40>;
- rockchip,phy_ddr3_dq_drv = <40>;
- rockchip,phy_ddr3_odt = <240>;
rockchip,lpddr3_odt_dis_freq = <333>;
- rockchip,lpddr3_drv = <34>;
- rockchip,lpddr3_odt = <240>;
- rockchip,phy_lpddr3_ca_drv = <40>;
- rockchip,phy_lpddr3_dq_drv = <40>;
- rockchip,phy_lpddr3_odt = <240>;
rockchip,lpddr4_odt_dis_freq = <333>;
- rockchip,lpddr4_drv = <60>;
- rockchip,lpddr4_dq_odt = <40>;
- rockchip,lpddr4_ca_odt = <40>;
- rockchip,phy_lpddr4_ca_drv = <40>;
- rockchip,phy_lpddr4_ck_cs_drv = <80>;
- rockchip,phy_lpddr4_dq_drv = <80>;
- rockchip,phy_lpddr4_odt = <60>;
};
--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 09:56:20

by Brian Norris

Subject: [PATCH v3 08/15] PM / devfreq: rk3399_dmc: Use bitfield macro definitions for ODT_PD

We're going to add new usages, and it's cleaner to work with macros
instead of comments and magic numbers.

Signed-off-by: Brian Norris <[email protected]>
---

(no changes since v1)

drivers/devfreq/rk3399_dmc.c | 43 ++++++++++++++++++++----------------
1 file changed, 24 insertions(+), 19 deletions(-)

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index 8f447217303f..c4efbc15cbb1 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -5,6 +5,7 @@
*/

#include <linux/arm-smccc.h>
+#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/devfreq.h>
@@ -23,6 +24,15 @@
#include <soc/rockchip/rk3399_grf.h>
#include <soc/rockchip/rockchip_sip.h>

+#define RK3399_SET_ODT_PD_0_SR_IDLE GENMASK(7, 0)
+#define RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE GENMASK(15, 8)
+#define RK3399_SET_ODT_PD_0_STANDBY_IDLE GENMASK(31, 16)
+
+#define RK3399_SET_ODT_PD_1_PD_IDLE GENMASK(11, 0)
+#define RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE GENMASK(27, 16)
+
+#define RK3399_SET_ODT_PD_2_ODT_ENABLE BIT(0)
+
struct rk3399_dmcfreq {
struct device *dev;
struct devfreq *devfreq;
@@ -55,7 +65,6 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
unsigned long old_clk_rate = dmcfreq->rate;
unsigned long target_volt, target_rate;
struct arm_smccc_res res;
- bool odt_enable = false;
int err;

opp = devfreq_recommended_opp(dev, freq, flags);
@@ -72,8 +81,10 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
mutex_lock(&dmcfreq->lock);

if (dmcfreq->regmap_pmu) {
+ unsigned int odt_pd_arg2 = 0;
+
if (target_rate >= dmcfreq->odt_dis_freq)
- odt_enable = true;
+ odt_pd_arg2 |= RK3399_SET_ODT_PD_2_ODT_ENABLE;

/*
* This makes a SMC call to the TF-A to set the DDR PD
@@ -83,7 +94,7 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, dmcfreq->odt_pd_arg0,
dmcfreq->odt_pd_arg1,
ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD,
- odt_enable, 0, 0, 0, &res);
+ odt_pd_arg2, 0, 0, 0, &res);
}

/*
@@ -316,23 +327,17 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
/*
* In TF-A there is a platform SIP call to set the PD (power-down)
* timings and to enable or disable the ODT (on-die termination).
- * This call needs three arguments as follows:
- *
- * arg0:
- * bit[0-7] : sr_idle
- * bit[8-15] : sr_mc_gate_idle
- * bit[16-31] : standby idle
- * arg1:
- * bit[0-11] : pd_idle
- * bit[16-27] : srpd_lite_idle
- * arg2:
- * bit[0] : odt enable
*/
- data->odt_pd_arg0 = (data->sr_idle & 0xff) |
- ((data->sr_mc_gate_idle & 0xff) << 8) |
- ((data->standby_idle & 0xffff) << 16);
- data->odt_pd_arg1 = (data->pd_idle & 0xfff) |
- ((data->srpd_lite_idle & 0xfff) << 16);
+ data->odt_pd_arg0 =
+ FIELD_PREP(RK3399_SET_ODT_PD_0_SR_IDLE, data->sr_idle) |
+ FIELD_PREP(RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE,
+ data->sr_mc_gate_idle) |
+ FIELD_PREP(RK3399_SET_ODT_PD_0_STANDBY_IDLE,
+ data->standby_idle);
+ data->odt_pd_arg1 =
+ FIELD_PREP(RK3399_SET_ODT_PD_1_PD_IDLE, data->pd_idle) |
+ FIELD_PREP(RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE,
+ data->srpd_lite_idle);

/*
* We add a devfreq driver to our parent since it has a device tree node
--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 11:43:32

by Brian Norris

Subject: [PATCH v3 03/15] dt-bindings: devfreq: rk3399_dmc: Fix Hz units

The driver and all downstream device trees [1] are using Hz units, but
the document claims MHz. DRAM frequency for these systems can't possibly
exceed 2^32-1 Hz, so the choice of unit doesn't really matter than much.

Rather than add unnecessary risk in getting the units wrong, let's just
go with the unofficial convention and make the docs match reality.

A sub-1MHz frequency is extremely unlikely, so include a minimum in the
schema, to help catch anybody who might have believed this was MHz.

[1] And notably, also those trying to upstream them:
https://lore.kernel.org/lkml/[email protected]/

Signed-off-by: Brian Norris <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Acked-by: Chanwoo Choi <[email protected]>
---

Changes in v3:
* Add Reviewed-by, Acked-by

.../bindings/devfreq/rk3399_dmc.yaml | 24 +++++++++----------
1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
index 4ca43b76ed51..2904ae4115f3 100644
--- a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
+++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
@@ -117,11 +117,11 @@ properties:

rockchip,ddr3_odt_dis_freq:
$ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 1000000 # In case anyone thought this was MHz.
description:
When the DRAM type is DDR3, this parameter defines the ODT disable
- frequency in MHz (Mega Hz). When the DDR frequency is less then
- ddr3_odt_dis_freq, the ODT on the DRAM side and controller side are both
- disabled.
+ frequency in Hz. When the DDR frequency is less then ddr3_odt_dis_freq,
+ the ODT on the DRAM side and controller side are both disabled.

rockchip,ddr3_drv:
deprecated: true
@@ -161,11 +161,11 @@ properties:

rockchip,lpddr3_odt_dis_freq:
$ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 1000000 # In case anyone thought this was MHz.
description:
When the DRAM type is LPDDR3, this parameter defines then ODT disable
- frequency in MHz (Mega Hz). When DDR frequency is less then
- ddr3_odt_dis_freq, the ODT on the DRAM side and controller side are both
- disabled.
+ frequency in Hz. When DDR frequency is less then ddr3_odt_dis_freq, the
+ ODT on the DRAM side and controller side are both disabled.

rockchip,lpddr3_drv:
deprecated: true
@@ -205,11 +205,11 @@ properties:

rockchip,lpddr4_odt_dis_freq:
$ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 1000000 # In case anyone thought this was MHz.
description:
When the DRAM type is LPDDR4, this parameter defines the ODT disable
- frequency in MHz (Mega Hz). When the DDR frequency is less then
- ddr3_odt_dis_freq, the ODT on the DRAM side and controller side are both
- disabled.
+ frequency in Hz. When the DDR frequency is less then ddr3_odt_dis_freq,
+ the ODT on the DRAM side and controller side are both disabled.

rockchip,lpddr4_drv:
deprecated: true
@@ -288,7 +288,7 @@ examples:
rockchip,sr_mc_gate_idle = <0x3>;
rockchip,srpd_lite_idle = <0x4>;
rockchip,standby_idle = <0x2000>;
- rockchip,ddr3_odt_dis_freq = <333>;
- rockchip,lpddr3_odt_dis_freq = <333>;
- rockchip,lpddr4_odt_dis_freq = <333>;
+ rockchip,ddr3_odt_dis_freq = <333000000>;
+ rockchip,lpddr3_odt_dis_freq = <333000000>;
+ rockchip,lpddr4_odt_dis_freq = <333000000>;
};
--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 14:07:58

by Brian Norris

Subject: [PATCH v3 01/15] dt-bindings: devfreq: rk3399_dmc: Convert to YAML

I want to add, deprecate, and bugfix some properties, as well as add the
first users. This is easier with a proper schema.

The transformation is mostly straightforward, plus a few notable tweaks:

* Renamed rockchip,dram_speed_bin to rockchip,ddr3_speed_bin. The
driver code and the example matched, but the description was
different. I went with the implementation. Note that this property is
also slated for deprecation/deletion in the subsequent patches.

* Drop upthreshold and downdifferential properties from the example.
These were undocumented (so, wouldn't pass validation), but were
representing software properties (governor tweaks). I drop them from
the driver in subsequent patches.

* Rename clock from pclk_ddr_mon to dmc_clk. The driver, DT example,
and all downstream users matched -- the binding definition was the
exception. Anyway, "dmc_clk" is a more appropriately generic name.

Signed-off-by: Brian Norris <[email protected]>
---

Changes in v3:
* Add |maxItems| for devfreq-events
* Improve deprecation notes

Changes in v2:
* rename to 'memory-controller' in example
* place 'required' after properties
* drop superluous free-form references and repetitions of other
bindings
* fix for yamllint

.../bindings/devfreq/rk3399_dmc.txt | 212 -------------
.../bindings/devfreq/rk3399_dmc.yaml | 294 ++++++++++++++++++
2 files changed, 294 insertions(+), 212 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
create mode 100644 Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml

diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
deleted file mode 100644
index 58fc8a6cebc7..000000000000
--- a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
+++ /dev/null
@@ -1,212 +0,0 @@
-* Rockchip rk3399 DMC (Dynamic Memory Controller) device
-
-Required properties:
-- compatible: Must be "rockchip,rk3399-dmc".
-- devfreq-events: Node to get DDR loading, Refer to
- Documentation/devicetree/bindings/devfreq/event/
- rockchip-dfi.txt
-- clocks: Phandles for clock specified in "clock-names" property
-- clock-names : The name of clock used by the DFI, must be
- "pclk_ddr_mon";
-- operating-points-v2: Refer to Documentation/devicetree/bindings/opp/opp-v2.yaml
- for details.
-- center-supply: DMC supply node.
-- status: Marks the node enabled/disabled.
-- rockchip,pmu: Phandle to the syscon managing the "PMU general register
- files".
-
-Optional properties:
-- interrupts: The CPU interrupt number. The interrupt specifier
- format depends on the interrupt controller.
- It should be a DCF interrupt. When DDR DVFS finishes
- a DCF interrupt is triggered.
-- rockchip,pmu: Phandle to the syscon managing the "PMU general register
- files".
-
-Following properties relate to DDR timing:
-
-- rockchip,dram_speed_bin : Value reference include/dt-bindings/clock/rk3399-ddr.h,
- it selects the DDR3 cl-trp-trcd type. It must be
- set according to "Speed Bin" in DDR3 datasheet,
- DO NOT use a smaller "Speed Bin" than specified
- for the DDR3 being used.
-
-- rockchip,pd_idle : Configure the PD_IDLE value. Defines the
- power-down idle period in which memories are
- placed into power-down mode if bus is idle
- for PD_IDLE DFI clock cycles.
-
-- rockchip,sr_idle : Configure the SR_IDLE value. Defines the
- self-refresh idle period in which memories are
- placed into self-refresh mode if bus is idle
- for SR_IDLE * 1024 DFI clock cycles (DFI
- clocks freq is half of DRAM clock), default
- value is "0".
-
-- rockchip,sr_mc_gate_idle : Defines the memory self-refresh and controller
- clock gating idle period. Memories are placed
- into self-refresh mode and memory controller
- clock arg gating started if bus is idle for
- sr_mc_gate_idle*1024 DFI clock cycles.
-
-- rockchip,srpd_lite_idle : Defines the self-refresh power down idle
- period in which memories are placed into
- self-refresh power down mode if bus is idle
- for srpd_lite_idle * 1024 DFI clock cycles.
- This parameter is for LPDDR4 only.
-
-- rockchip,standby_idle : Defines the standby idle period in which
- memories are placed into self-refresh mode.
- The controller, pi, PHY and DRAM clock will
- be gated if bus is idle for standby_idle * DFI
- clock cycles.
-
-- rockchip,dram_dll_dis_freq : Defines the DDR3 DLL bypass frequency in MHz.
- When DDR frequency is less than DRAM_DLL_DISB_FREQ,
- DDR3 DLL will be bypassed. Note: if DLL was bypassed,
- the odt will also stop working.
-
-- rockchip,phy_dll_dis_freq : Defines the PHY dll bypass frequency in
- MHz (Mega Hz). When DDR frequency is less than
- DRAM_DLL_DISB_FREQ, PHY DLL will be bypassed.
- Note: PHY DLL and PHY ODT are independent.
-
-- rockchip,ddr3_odt_dis_freq : When the DRAM type is DDR3, this parameter defines
- the ODT disable frequency in MHz (Mega Hz).
- when the DDR frequency is less then ddr3_odt_dis_freq,
- the ODT on the DRAM side and controller side are
- both disabled.
-
-- rockchip,ddr3_drv : When the DRAM type is DDR3, this parameter defines
- the DRAM side driver strength in ohms. Default
- value is 40.
-
-- rockchip,ddr3_odt : When the DRAM type is DDR3, this parameter defines
- the DRAM side ODT strength in ohms. Default value
- is 120.
-
-- rockchip,phy_ddr3_ca_drv : When the DRAM type is DDR3, this parameter defines
- the phy side CA line (incluing command line,
- address line and clock line) driver strength.
- Default value is 40.
-
-- rockchip,phy_ddr3_dq_drv : When the DRAM type is DDR3, this parameter defines
- the PHY side DQ line (including DQS/DQ/DM line)
- driver strength. Default value is 40.
-
-- rockchip,phy_ddr3_odt : When the DRAM type is DDR3, this parameter defines
- the PHY side ODT strength. Default value is 240.
-
-- rockchip,lpddr3_odt_dis_freq : When the DRAM type is LPDDR3, this parameter defines
- then ODT disable frequency in MHz (Mega Hz).
- When DDR frequency is less then ddr3_odt_dis_freq,
- the ODT on the DRAM side and controller side are
- both disabled.
-
-- rockchip,lpddr3_drv : When the DRAM type is LPDDR3, this parameter defines
- the DRAM side driver strength in ohms. Default
- value is 34.
-
-- rockchip,lpddr3_odt : When the DRAM type is LPDDR3, this parameter defines
- the DRAM side ODT strength in ohms. Default value
- is 240.
-
-- rockchip,phy_lpddr3_ca_drv : When the DRAM type is LPDDR3, this parameter defines
- the PHY side CA line (including command line,
- address line and clock line) driver strength.
- Default value is 40.
-
-- rockchip,phy_lpddr3_dq_drv : When the DRAM type is LPDDR3, this parameter defines
- the PHY side DQ line (including DQS/DQ/DM line)
- driver strength. Default value is 40.
-
-- rockchip,phy_lpddr3_odt : When dram type is LPDDR3, this parameter define
- the phy side odt strength, default value is 240.
-
-- rockchip,lpddr4_odt_dis_freq : When the DRAM type is LPDDR4, this parameter
- defines the ODT disable frequency in
- MHz (Mega Hz). When the DDR frequency is less then
- ddr3_odt_dis_freq, the ODT on the DRAM side and
- controller side are both disabled.
-
-- rockchip,lpddr4_drv : When the DRAM type is LPDDR4, this parameter defines
- the DRAM side driver strength in ohms. Default
- value is 60.
-
-- rockchip,lpddr4_dq_odt : When the DRAM type is LPDDR4, this parameter defines
- the DRAM side ODT on DQS/DQ line strength in ohms.
- Default value is 40.
-
-- rockchip,lpddr4_ca_odt : When the DRAM type is LPDDR4, this parameter defines
- the DRAM side ODT on CA line strength in ohms.
- Default value is 40.
-
-- rockchip,phy_lpddr4_ca_drv : When the DRAM type is LPDDR4, this parameter defines
- the PHY side CA line (including command address
- line) driver strength. Default value is 40.
-
-- rockchip,phy_lpddr4_ck_cs_drv : When the DRAM type is LPDDR4, this parameter defines
- the PHY side clock line and CS line driver
- strength. Default value is 80.
-
-- rockchip,phy_lpddr4_dq_drv : When the DRAM type is LPDDR4, this parameter defines
- the PHY side DQ line (including DQS/DQ/DM line)
- driver strength. Default value is 80.
-
-- rockchip,phy_lpddr4_odt : When the DRAM type is LPDDR4, this parameter defines
- the PHY side ODT strength. Default value is 60.
-
-Example:
- dmc_opp_table: dmc_opp_table {
- compatible = "operating-points-v2";
-
- opp00 {
- opp-hz = /bits/ 64 <300000000>;
- opp-microvolt = <900000>;
- };
- opp01 {
- opp-hz = /bits/ 64 <666000000>;
- opp-microvolt = <900000>;
- };
- };
-
- dmc: dmc {
- compatible = "rockchip,rk3399-dmc";
- devfreq-events = <&dfi>;
- interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>;
- clocks = <&cru SCLK_DDRC>;
- clock-names = "dmc_clk";
- operating-points-v2 = <&dmc_opp_table>;
- center-supply = <&ppvar_centerlogic>;
- upthreshold = <15>;
- downdifferential = <10>;
- rockchip,ddr3_speed_bin = <21>;
- rockchip,pd_idle = <0x40>;
- rockchip,sr_idle = <0x2>;
- rockchip,sr_mc_gate_idle = <0x3>;
- rockchip,srpd_lite_idle = <0x4>;
- rockchip,standby_idle = <0x2000>;
- rockchip,dram_dll_dis_freq = <300>;
- rockchip,phy_dll_dis_freq = <125>;
- rockchip,auto_pd_dis_freq = <666>;
- rockchip,ddr3_odt_dis_freq = <333>;
- rockchip,ddr3_drv = <40>;
- rockchip,ddr3_odt = <120>;
- rockchip,phy_ddr3_ca_drv = <40>;
- rockchip,phy_ddr3_dq_drv = <40>;
- rockchip,phy_ddr3_odt = <240>;
- rockchip,lpddr3_odt_dis_freq = <333>;
- rockchip,lpddr3_drv = <34>;
- rockchip,lpddr3_odt = <240>;
- rockchip,phy_lpddr3_ca_drv = <40>;
- rockchip,phy_lpddr3_dq_drv = <40>;
- rockchip,phy_lpddr3_odt = <240>;
- rockchip,lpddr4_odt_dis_freq = <333>;
- rockchip,lpddr4_drv = <60>;
- rockchip,lpddr4_dq_odt = <40>;
- rockchip,lpddr4_ca_odt = <40>;
- rockchip,phy_lpddr4_ca_drv = <40>;
- rockchip,phy_lpddr4_ck_cs_drv = <80>;
- rockchip,phy_lpddr4_dq_drv = <80>;
- rockchip,phy_lpddr4_odt = <60>;
- };
diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
new file mode 100644
index 000000000000..ddddddc5c6fb
--- /dev/null
+++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
@@ -0,0 +1,294 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# %YAML 1.2
+---
+$id: http://devicetree.org/schemas/devfreq/rk3399_dmc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip rk3399 DMC (Dynamic Memory Controller) device
+
+maintainers:
+ - Brian Norris <[email protected]>
+
+properties:
+ compatible:
+ enum:
+ - rockchip,rk3399-dmc
+
+ devfreq-events:
+ $ref: /schemas/types.yaml#/definitions/phandle-array
+ minItems: 1
+ maxItems: 1
+ description:
+ Node to get DDR loading. Refer to
+ Documentation/devicetree/bindings/devfreq/event/rockchip-dfi.txt.
+
+ clocks:
+ maxItems: 1
+
+ clock-names:
+ items:
+ - const: dmc_clk
+
+ operating-points-v2: true
+
+ center-supply:
+ description:
+ DMC regulator supply.
+
+ rockchip,pmu:
+ $ref: /schemas/types.yaml#/definitions/phandle
+ description:
+ Phandle to the syscon managing the "PMU general register files".
+
+ interrupts:
+ maxItems: 1
+ description:
+ The CPU interrupt number. It should be a DCF interrupt. When DDR DVFS
+ finishes, a DCF interrupt is triggered.
+
+ rockchip,ddr3_speed_bin:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ For values, reference include/dt-bindings/clock/rk3399-ddr.h. Selects the
+ DDR3 cl-trp-trcd type. It must be set according to "Speed Bin" in DDR3
+ datasheet; DO NOT use a smaller "Speed Bin" than specified for the DDR3
+ being used.
+
+ rockchip,pd_idle:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Configure the PD_IDLE value. Defines the power-down idle period in which
+ memories are placed into power-down mode if bus is idle for PD_IDLE DFI
+ clock cycles.
+
+ rockchip,sr_idle:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Configure the SR_IDLE value. Defines the self-refresh idle period in
+ which memories are placed into self-refresh mode if bus is idle for
+ SR_IDLE * 1024 DFI clock cycles (DFI clocks freq is half of DRAM clock).
+ Default value is "0".
+
+ rockchip,sr_mc_gate_idle:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Defines the memory self-refresh and controller clock gating idle period.
+ Memories are placed into self-refresh mode and memory controller clock
+ arg gating started if bus is idle for sr_mc_gate_idle*1024 DFI clock
+ cycles.
+
+ rockchip,srpd_lite_idle:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Defines the self-refresh power down idle period in which memories are
+ placed into self-refresh power down mode if bus is idle for
+ srpd_lite_idle * 1024 DFI clock cycles. This parameter is for LPDDR4
+ only.
+
+ rockchip,standby_idle:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Defines the standby idle period in which memories are placed into
+ self-refresh mode. The controller, pi, PHY and DRAM clock will be gated
+ if bus is idle for standby_idle * DFI clock cycles.
+
+ rockchip,dram_dll_dis_freq:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Defines the DDR3 DLL bypass frequency in MHz. When DDR frequency is less
+ than DRAM_DLL_DISB_FREQ, DDR3 DLL will be bypassed.
+ Note: if DLL was bypassed, the odt will also stop working.
+
+ rockchip,phy_dll_dis_freq:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ Defines the PHY dll bypass frequency in MHz (Mega Hz). When DDR frequency
+ is less than DRAM_DLL_DISB_FREQ, PHY DLL will be bypassed.
+ Note: PHY DLL and PHY ODT are independent.
+
+ rockchip,auto_pd_dis_freq:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Defines the auto PD disable frequency in MHz.
+
+ rockchip,ddr3_odt_dis_freq:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is DDR3, this parameter defines the ODT disable
+ frequency in MHz (Mega Hz). When the DDR frequency is less then
+ ddr3_odt_dis_freq, the ODT on the DRAM side and controller side are both
+ disabled.
+
+ rockchip,ddr3_drv:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is DDR3, this parameter defines the DRAM side drive
+ strength in ohms. Default value is 40.
+
+ rockchip,ddr3_odt:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is DDR3, this parameter defines the DRAM side ODT
+ strength in ohms. Default value is 120.
+
+ rockchip,phy_ddr3_ca_drv:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is DDR3, this parameter defines the phy side CA line
+ (incluing command line, address line and clock line) drive strength.
+ Default value is 40.
+
+ rockchip,phy_ddr3_dq_drv:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is DDR3, this parameter defines the PHY side DQ line
+ (including DQS/DQ/DM line) drive strength. Default value is 40.
+
+ rockchip,phy_ddr3_odt:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is DDR3, this parameter defines the PHY side ODT
+ strength. Default value is 240.
+
+ rockchip,lpddr3_odt_dis_freq:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is LPDDR3, this parameter defines then ODT disable
+ frequency in MHz (Mega Hz). When DDR frequency is less then
+ ddr3_odt_dis_freq, the ODT on the DRAM side and controller side are both
+ disabled.
+
+ rockchip,lpddr3_drv:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is LPDDR3, this parameter defines the DRAM side drive
+ strength in ohms. Default value is 34.
+
+ rockchip,lpddr3_odt:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is LPDDR3, this parameter defines the DRAM side ODT
+ strength in ohms. Default value is 240.
+
+ rockchip,phy_lpddr3_ca_drv:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is LPDDR3, this parameter defines the PHY side CA line
+ (including command line, address line and clock line) drive strength.
+ Default value is 40.
+
+ rockchip,phy_lpddr3_dq_drv:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is LPDDR3, this parameter defines the PHY side DQ line
+ (including DQS/DQ/DM line) drive strength. Default value is 40.
+
+ rockchip,phy_lpddr3_odt:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When dram type is LPDDR3, this parameter define the phy side odt
+ strength, default value is 240.
+
+ rockchip,lpddr4_odt_dis_freq:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is LPDDR4, this parameter defines the ODT disable
+ frequency in MHz (Mega Hz). When the DDR frequency is less then
+ ddr3_odt_dis_freq, the ODT on the DRAM side and controller side are both
+ disabled.
+
+ rockchip,lpddr4_drv:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is LPDDR4, this parameter defines the DRAM side drive
+ strength in ohms. Default value is 60.
+
+ rockchip,lpddr4_dq_odt:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is LPDDR4, this parameter defines the DRAM side ODT on
+ DQS/DQ line strength in ohms. Default value is 40.
+
+ rockchip,lpddr4_ca_odt:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is LPDDR4, this parameter defines the DRAM side ODT on
+ CA line strength in ohms. Default value is 40.
+
+ rockchip,phy_lpddr4_ca_drv:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is LPDDR4, this parameter defines the PHY side CA line
+ (including command address line) drive strength. Default value is 40.
+
+ rockchip,phy_lpddr4_ck_cs_drv:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is LPDDR4, this parameter defines the PHY side clock
+ line and CS line drive strength. Default value is 80.
+
+ rockchip,phy_lpddr4_dq_drv:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is LPDDR4, this parameter defines the PHY side DQ line
+ (including DQS/DQ/DM line) drive strength. Default value is 80.
+
+ rockchip,phy_lpddr4_odt:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ When the DRAM type is LPDDR4, this parameter defines the PHY side ODT
+ strength. Default value is 60.
+
+required:
+ - compatible
+ - devfreq-events
+ - clocks
+ - clock-names
+ - operating-points-v2
+ - center-supply
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/rk3399-cru.h>
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+ memory-controller {
+ compatible = "rockchip,rk3399-dmc";
+ devfreq-events = <&dfi>;
+ rockchip,pmu = <&pmu>;
+ interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&cru SCLK_DDRC>;
+ clock-names = "dmc_clk";
+ operating-points-v2 = <&dmc_opp_table>;
+ center-supply = <&ppvar_centerlogic>;
+ rockchip,ddr3_speed_bin = <21>;
+ rockchip,pd_idle = <0x40>;
+ rockchip,sr_idle = <0x2>;
+ rockchip,sr_mc_gate_idle = <0x3>;
+ rockchip,srpd_lite_idle = <0x4>;
+ rockchip,standby_idle = <0x2000>;
+ rockchip,dram_dll_dis_freq = <300>;
+ rockchip,phy_dll_dis_freq = <125>;
+ rockchip,auto_pd_dis_freq = <666>;
+ rockchip,ddr3_odt_dis_freq = <333>;
+ rockchip,ddr3_drv = <40>;
+ rockchip,ddr3_odt = <120>;
+ rockchip,phy_ddr3_ca_drv = <40>;
+ rockchip,phy_ddr3_dq_drv = <40>;
+ rockchip,phy_ddr3_odt = <240>;
+ rockchip,lpddr3_odt_dis_freq = <333>;
+ rockchip,lpddr3_drv = <34>;
+ rockchip,lpddr3_odt = <240>;
+ rockchip,phy_lpddr3_ca_drv = <40>;
+ rockchip,phy_lpddr3_dq_drv = <40>;
+ rockchip,phy_lpddr3_odt = <240>;
+ rockchip,lpddr4_odt_dis_freq = <333>;
+ rockchip,lpddr4_drv = <60>;
+ rockchip,lpddr4_dq_odt = <40>;
+ rockchip,lpddr4_ca_odt = <40>;
+ rockchip,phy_lpddr4_ca_drv = <40>;
+ rockchip,phy_lpddr4_ck_cs_drv = <80>;
+ rockchip,phy_lpddr4_dq_drv = <80>;
+ rockchip,phy_lpddr4_odt = <60>;
+ };
--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 15:59:32

by Brian Norris

Subject: [PATCH v3 05/15] dt-bindings: devfreq: rk3399_dmc: Add more disable-freq properties

DDR DVFS tuning has found that several power-saving features don't have
good tradeoffs at higher frequencies -- at higher frequencies, we'll see
glitches or other errors. Provide tuning controls so these can be
disabled at higher OPPs, and left active only at the lower ones.

Signed-off-by: Brian Norris <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
---

Changes in v3:
* Add Reviewed-by

Changes in v2:
* hyphens, not underscores
* *-hz units, and drop the types definition

.../bindings/devfreq/rk3399_dmc.yaml | 37 +++++++++++++++++++
1 file changed, 37 insertions(+)

diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
index 6a33a7b44741..60ed5023f54f 100644
--- a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
+++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
@@ -300,6 +300,38 @@ properties:
self-refresh mode. The controller, pi, PHY and DRAM clock will be gated
if bus is idle for standby_idle nanoseconds.

+ rockchip,pd-idle-dis-freq-hz:
+ description:
+ Defines the power-down idle disable frequency in Hz. When the DDR
+ frequency is greater than pd-idle-dis-freq, power-down idle is disabled.
+ See also rockchip,pd-idle-ns.
+
+ rockchip,sr-idle-dis-freq-hz:
+ description:
+ Defines the self-refresh idle disable frequency in Hz. When the DDR
+ frequency is greater than sr-idle-dis-freq, self-refresh idle is
+ disabled. See also rockchip,sr-idle-ns.
+
+ rockchip,sr-mc-gate-idle-dis-freq-hz:
+ description:
+ Defines the self-refresh and memory-controller clock gating disable
+ frequency in Hz. When the DDR frequency is greater than
+ sr-mc-gate-idle-dis-freq, the clock will not be gated when idle. See also
+ rockchip,sr-mc-gate-idle-ns.
+
+ rockchip,srpd-lite-idle-dis-freq-hz:
+ description:
+ Defines the self-refresh power down idle disable frequency in Hz. When
+ the DDR frequency is greater than srpd-lite-idle-dis-freq, memory will
+ not be placed into self-refresh power down mode when idle. See also
+ rockchip,srpd-lite-idle-ns.
+
+ rockchip,standby-idle-dis-freq-hz:
+ description:
+ Defines the standby idle disable frequency in Hz. When the DDR frequency
+ is greater than standby-idle-dis-freq, standby idle is disabled. See also
+ rockchip,standby-idle-ns.
+
required:
- compatible
- devfreq-events
@@ -331,4 +363,9 @@ examples:
rockchip,ddr3_odt_dis_freq = <333000000>;
rockchip,lpddr3_odt_dis_freq = <333000000>;
rockchip,lpddr4_odt_dis_freq = <333000000>;
+ rockchip,pd-idle-dis-freq-hz = <1000000000>;
+ rockchip,sr-idle-dis-freq-hz = <1000000000>;
+ rockchip,sr-mc-gate-idle-dis-freq-hz = <1000000000>;
+ rockchip,srpd-lite-idle-dis-freq-hz = <0>;
+ rockchip,standby-idle-dis-freq-hz = <928000000>;
};
--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 17:14:02

by Brian Norris

Subject: [PATCH v3 12/15] arm64: dts: rockchip: Enable dmc and dfi nodes on gru

From: Lin Huang <[email protected]>

Enable the DMC (Dynamic Memory Controller) and the DFI (DDR PHY
Interface) nodes on gru boards so we can support DDR DVFS.

Signed-off-by: Lin Huang <[email protected]>
Signed-off-by: Enric Balletbo i Serra <[email protected]>
Signed-off-by: Gaël PORTAY <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Signed-off-by: Brian Norris <[email protected]>
---

(no changes since v2)

Changes in v2:
- Adapt to new properties

Changes in v1:
This was part of a previous series, at:
https://lore.kernel.org/r/[email protected]
I've picked up a bunch of changes and fixes, so I've restarted the patch
series numbering. Updates since the old series:
- reordered alphabetically by phandle name, per style
- drop a ton of deprecated/unused properties
- add required center-supply for scarlet
- add new *_idle_dis_freq properties
- drop the lowest (200 MHz) OPP; this was never stabilized for
production
- bump the voltage (0.9V -> 0.925V) for the highest OPP on Chromebook
models; later (tablet) models were more stable, with a fixed DDR
regulator
- bump odt_dis_freq to 666 MHz; early versions used 333 MHz, but
stabilization efforts landed on 666 MHz for production

.../dts/rockchip/rk3399-gru-chromebook.dtsi | 7 +++++
.../boot/dts/rockchip/rk3399-gru-scarlet.dtsi | 12 ++++++++
arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi | 28 +++++++++++++++++++
.../boot/dts/rockchip/rk3399-op1-opp.dtsi | 25 +++++++++++++++++
4 files changed, 72 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-gru-chromebook.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-gru-chromebook.dtsi
index 3355fb90fa54..50d459ee4831 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-gru-chromebook.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-gru-chromebook.dtsi
@@ -234,6 +234,13 @@ &cdn_dp {
extcon = <&usbc_extcon0>, <&usbc_extcon1>;
};

+&dmc {
+ center-supply = <&ppvar_centerlogic>;
+ rockchip,pd-idle-dis-freq-hz = <800000000>;
+ rockchip,sr-idle-dis-freq-hz = <800000000>;
+ rockchip,sr-mc-gate-idle-dis-freq-hz = <800000000>;
+};
+
&edp {
status = "okay";

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-gru-scarlet.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-gru-scarlet.dtsi
index a9817b3d7edc..913d845eb51a 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-gru-scarlet.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-gru-scarlet.dtsi
@@ -391,6 +391,18 @@ &cru {
<400000000>;
};

+/* The center supply is fixed to .9V on scarlet */
+&dmc {
+ center-supply = <&pp900_s0>;
+};
+
+/* We don't need .925 V for 928 MHz on scarlet */
+&dmc_opp_table {
+ opp03 {
+ opp-microvolt = <900000>;
+ };
+};
+
&gpio0 {
gpio-line-names = /* GPIO0 A 0-7 */
"CLK_32K_AP",
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi
index 162f08bca0d4..23bfba86daab 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi
@@ -373,6 +373,34 @@ &cru {
<200000000>;
};

+&dfi {
+ status = "okay";
+};
+
+&dmc {
+ status = "okay";
+
+ rockchip,pd-idle-ns = <160>;
+ rockchip,sr-idle-ns = <10240>;
+ rockchip,sr-mc-gate-idle-ns = <40960>;
+ rockchip,srpd-lite-idle-ns = <61440>;
+ rockchip,standby-idle-ns = <81920>;
+
+ rockchip,ddr3_odt_dis_freq = <666000000>;
+ rockchip,lpddr3_odt_dis_freq = <666000000>;
+ rockchip,lpddr4_odt_dis_freq = <666000000>;
+
+ rockchip,sr-mc-gate-idle-dis-freq-hz = <1000000000>;
+ rockchip,srpd-lite-idle-dis-freq-hz = <0>;
+ rockchip,standby-idle-dis-freq-hz = <928000000>;
+};
+
+&dmc_opp_table {
+ opp03 {
+ opp-suspend;
+ };
+};
+
&emmc_phy {
status = "okay";
};
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-op1-opp.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-op1-opp.dtsi
index 2180e0f75003..6e29e74f6fc6 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-op1-opp.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-op1-opp.dtsi
@@ -110,6 +110,27 @@ opp05 {
opp-microvolt = <1075000>;
};
};
+
+ dmc_opp_table: dmc_opp_table {
+ compatible = "operating-points-v2";
+
+ opp00 {
+ opp-hz = /bits/ 64 <400000000>;
+ opp-microvolt = <900000>;
+ };
+ opp01 {
+ opp-hz = /bits/ 64 <666000000>;
+ opp-microvolt = <900000>;
+ };
+ opp02 {
+ opp-hz = /bits/ 64 <800000000>;
+ opp-microvolt = <900000>;
+ };
+ opp03 {
+ opp-hz = /bits/ 64 <928000000>;
+ opp-microvolt = <925000>;
+ };
+ };
};

&cpu_l0 {
@@ -136,6 +157,10 @@ &cpu_b1 {
operating-points-v2 = <&cluster1_opp>;
};

+&dmc {
+ operating-points-v2 = <&dmc_opp_table>;
+};
+
&gpu {
operating-points-v2 = <&gpu_opp_table>;
};
--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 18:54:35

by Brian Norris

Subject: [PATCH v3 07/15] PM / devfreq: rk3399_dmc: Drop excess timing properties

All of these properties are initialized by ARM Trusted Firmware, and
have been since the early days of this chip. It's redundant (and
possibly wrong) to do this here now. What's more, there seems to be some
confusion about the units and some of the definitions of this timing
struct: the DT docs say MHz for many of these, but downstream users were
in Hz (and therefore, the ATF interface was Hz). Also, the in-driver
usage for some of these (e.g., for comparing to target frequency) were
in Hz too. So doubly wrong.

We can avoid thinking about who got the right units by dropping the
unnecessary code and properties. They are marked deprecated in the
binding schema.

Signed-off-by: Brian Norris <[email protected]>
---

(no changes since v1)

drivers/devfreq/rk3399_dmc.c | 144 +++++++----------------------------
1 file changed, 29 insertions(+), 115 deletions(-)

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index e982862f6ac2..8f447217303f 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -23,38 +23,6 @@
#include <soc/rockchip/rk3399_grf.h>
#include <soc/rockchip/rockchip_sip.h>

-struct dram_timing {
- unsigned int ddr3_speed_bin;
- unsigned int pd_idle;
- unsigned int sr_idle;
- unsigned int sr_mc_gate_idle;
- unsigned int srpd_lite_idle;
- unsigned int standby_idle;
- unsigned int auto_pd_dis_freq;
- unsigned int dram_dll_dis_freq;
- unsigned int phy_dll_dis_freq;
- unsigned int ddr3_odt_dis_freq;
- unsigned int ddr3_drv;
- unsigned int ddr3_odt;
- unsigned int phy_ddr3_ca_drv;
- unsigned int phy_ddr3_dq_drv;
- unsigned int phy_ddr3_odt;
- unsigned int lpddr3_odt_dis_freq;
- unsigned int lpddr3_drv;
- unsigned int lpddr3_odt;
- unsigned int phy_lpddr3_ca_drv;
- unsigned int phy_lpddr3_dq_drv;
- unsigned int phy_lpddr3_odt;
- unsigned int lpddr4_odt_dis_freq;
- unsigned int lpddr4_drv;
- unsigned int lpddr4_dq_odt;
- unsigned int lpddr4_ca_odt;
- unsigned int phy_lpddr4_ca_drv;
- unsigned int phy_lpddr4_ck_cs_drv;
- unsigned int phy_lpddr4_dq_drv;
- unsigned int phy_lpddr4_odt;
-};
-
struct rk3399_dmcfreq {
struct device *dev;
struct devfreq *devfreq;
@@ -62,13 +30,21 @@ struct rk3399_dmcfreq {
struct clk *dmc_clk;
struct devfreq_event_dev *edev;
struct mutex lock;
- struct dram_timing timing;
struct regulator *vdd_center;
struct regmap *regmap_pmu;
unsigned long rate, target_rate;
unsigned long volt, target_volt;
unsigned int odt_dis_freq;
int odt_pd_arg0, odt_pd_arg1;
+
+ unsigned int pd_idle;
+ unsigned int sr_idle;
+ unsigned int sr_mc_gate_idle;
+ unsigned int srpd_lite_idle;
+ unsigned int standby_idle;
+ unsigned int ddr3_odt_dis_freq;
+ unsigned int lpddr3_odt_dis_freq;
+ unsigned int lpddr4_odt_dis_freq;
};

static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
@@ -238,69 +214,27 @@ static __maybe_unused int rk3399_dmcfreq_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(rk3399_dmcfreq_pm, rk3399_dmcfreq_suspend,
rk3399_dmcfreq_resume);

-static int of_get_ddr_timings(struct dram_timing *timing,
- struct device_node *np)
+static int rk3399_dmcfreq_of_props(struct rk3399_dmcfreq *data,
+ struct device_node *np)
{
int ret = 0;

- ret = of_property_read_u32(np, "rockchip,ddr3_speed_bin",
- &timing->ddr3_speed_bin);
ret |= of_property_read_u32(np, "rockchip,pd_idle",
- &timing->pd_idle);
+ &data->pd_idle);
ret |= of_property_read_u32(np, "rockchip,sr_idle",
- &timing->sr_idle);
+ &data->sr_idle);
ret |= of_property_read_u32(np, "rockchip,sr_mc_gate_idle",
- &timing->sr_mc_gate_idle);
+ &data->sr_mc_gate_idle);
ret |= of_property_read_u32(np, "rockchip,srpd_lite_idle",
- &timing->srpd_lite_idle);
+ &data->srpd_lite_idle);
ret |= of_property_read_u32(np, "rockchip,standby_idle",
- &timing->standby_idle);
- ret |= of_property_read_u32(np, "rockchip,auto_pd_dis_freq",
- &timing->auto_pd_dis_freq);
- ret |= of_property_read_u32(np, "rockchip,dram_dll_dis_freq",
- &timing->dram_dll_dis_freq);
- ret |= of_property_read_u32(np, "rockchip,phy_dll_dis_freq",
- &timing->phy_dll_dis_freq);
+ &data->standby_idle);
ret |= of_property_read_u32(np, "rockchip,ddr3_odt_dis_freq",
- &timing->ddr3_odt_dis_freq);
- ret |= of_property_read_u32(np, "rockchip,ddr3_drv",
- &timing->ddr3_drv);
- ret |= of_property_read_u32(np, "rockchip,ddr3_odt",
- &timing->ddr3_odt);
- ret |= of_property_read_u32(np, "rockchip,phy_ddr3_ca_drv",
- &timing->phy_ddr3_ca_drv);
- ret |= of_property_read_u32(np, "rockchip,phy_ddr3_dq_drv",
- &timing->phy_ddr3_dq_drv);
- ret |= of_property_read_u32(np, "rockchip,phy_ddr3_odt",
- &timing->phy_ddr3_odt);
+ &data->ddr3_odt_dis_freq);
ret |= of_property_read_u32(np, "rockchip,lpddr3_odt_dis_freq",
- &timing->lpddr3_odt_dis_freq);
- ret |= of_property_read_u32(np, "rockchip,lpddr3_drv",
- &timing->lpddr3_drv);
- ret |= of_property_read_u32(np, "rockchip,lpddr3_odt",
- &timing->lpddr3_odt);
- ret |= of_property_read_u32(np, "rockchip,phy_lpddr3_ca_drv",
- &timing->phy_lpddr3_ca_drv);
- ret |= of_property_read_u32(np, "rockchip,phy_lpddr3_dq_drv",
- &timing->phy_lpddr3_dq_drv);
- ret |= of_property_read_u32(np, "rockchip,phy_lpddr3_odt",
- &timing->phy_lpddr3_odt);
+ &data->lpddr3_odt_dis_freq);
ret |= of_property_read_u32(np, "rockchip,lpddr4_odt_dis_freq",
- &timing->lpddr4_odt_dis_freq);
- ret |= of_property_read_u32(np, "rockchip,lpddr4_drv",
- &timing->lpddr4_drv);
- ret |= of_property_read_u32(np, "rockchip,lpddr4_dq_odt",
- &timing->lpddr4_dq_odt);
- ret |= of_property_read_u32(np, "rockchip,lpddr4_ca_odt",
- &timing->lpddr4_ca_odt);
- ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_ca_drv",
- &timing->phy_lpddr4_ca_drv);
- ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_ck_cs_drv",
- &timing->phy_lpddr4_ck_cs_drv);
- ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_dq_drv",
- &timing->phy_lpddr4_dq_drv);
- ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_odt",
- &timing->phy_lpddr4_odt);
+ &data->lpddr4_odt_dis_freq);

return ret;
}
@@ -311,8 +245,7 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct device_node *np = pdev->dev.of_node, *node;
struct rk3399_dmcfreq *data;
- int ret, index, size;
- uint32_t *timing;
+ int ret;
struct dev_pm_opp *opp;
u32 ddr_type;
u32 val;
@@ -343,26 +276,7 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
return ret;
}

- /*
- * Get dram timing and pass it to arm trust firmware,
- * the dram driver in arm trust firmware will get these
- * timing and to do dram initial.
- */
- if (!of_get_ddr_timings(&data->timing, np)) {
- timing = &data->timing.ddr3_speed_bin;
- size = sizeof(struct dram_timing) / 4;
- for (index = 0; index < size; index++) {
- arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, *timing++, index,
- ROCKCHIP_SIP_CONFIG_DRAM_SET_PARAM,
- 0, 0, 0, 0, &res);
- if (res.a0) {
- dev_err(dev, "Failed to set dram param: %ld\n",
- res.a0);
- ret = -EINVAL;
- goto err_edev;
- }
- }
- }
+ rk3399_dmcfreq_of_props(data, np);

node = of_parse_phandle(np, "rockchip,pmu", 0);
if (!node)
@@ -381,13 +295,13 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)

switch (ddr_type) {
case RK3399_PMUGRF_DDRTYPE_DDR3:
- data->odt_dis_freq = data->timing.ddr3_odt_dis_freq;
+ data->odt_dis_freq = data->ddr3_odt_dis_freq;
break;
case RK3399_PMUGRF_DDRTYPE_LPDDR3:
- data->odt_dis_freq = data->timing.lpddr3_odt_dis_freq;
+ data->odt_dis_freq = data->lpddr3_odt_dis_freq;
break;
case RK3399_PMUGRF_DDRTYPE_LPDDR4:
- data->odt_dis_freq = data->timing.lpddr4_odt_dis_freq;
+ data->odt_dis_freq = data->lpddr4_odt_dis_freq;
break;
default:
ret = -EINVAL;
@@ -414,11 +328,11 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
* arg2:
* bit[0] : odt enable
*/
- data->odt_pd_arg0 = (data->timing.sr_idle & 0xff) |
- ((data->timing.sr_mc_gate_idle & 0xff) << 8) |
- ((data->timing.standby_idle & 0xffff) << 16);
- data->odt_pd_arg1 = (data->timing.pd_idle & 0xfff) |
- ((data->timing.srpd_lite_idle & 0xfff) << 16);
+ data->odt_pd_arg0 = (data->sr_idle & 0xff) |
+ ((data->sr_mc_gate_idle & 0xff) << 8) |
+ ((data->standby_idle & 0xffff) << 16);
+ data->odt_pd_arg1 = (data->pd_idle & 0xfff) |
+ ((data->srpd_lite_idle & 0xfff) << 16);

/*
* We add a devfreq driver to our parent since it has a device tree node
--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 20:16:44

by Brian Norris

Subject: Re: [PATCH v3 01/15] dt-bindings: devfreq: rk3399_dmc: Convert to YAML

On Tue, Mar 08, 2022 at 07:03:15PM +0100, Krzysztof Kozlowski wrote:
> On 08/03/2022 01:09, Brian Norris wrote:

> Apologies for jumping in late in discussion, but how about moving it to
> memory-controllers or interconnect directory? devfreq is Linux specific
> and DMC sounds a lot like dynamic memory controller.

Sure! Will do in v4.

> >
> > .../bindings/devfreq/rk3399_dmc.txt | 212 -------------
> > .../bindings/devfreq/rk3399_dmc.yaml | 294 ++++++++++++++++++
>
> file name:
> rockchip,rk3399-dmc.yaml

Ack.

> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml

> > + devfreq-events:
> > + $ref: /schemas/types.yaml#/definitions/phandle-array
> > + minItems: 1
> > + maxItems: 1
>
> Rob previously asked about max, but it seems it is only one phandle,
> right? Then the type - 'phandle'.

Sure! Don't know why I didn't notice that.

> > + rockchip,ddr3_odt:
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + description:
> > + When the DRAM type is DDR3, this parameter defines the DRAM side ODT
> > + strength in ohms. Default value is 120.
>
> Here and in all other places - instead of describing default value in
> description, just add "default: 120".

Yep. Most of these properties are actually deprecated in the end, but
doesn't hurt to use the facilities available.

> Best regards,
> Krzysztof

Thanks for the reviews! I'll roll them all into v4 shortly.

While I'm at it: I think I have Reviewed-by's for all the DT patches
(except this one). Given it also touches Rockchip device trees, maybe
this all needs to go through Heiko / linux-rockchip? Or if not, it'd be
nice if Heiko spoke up to tell the devfreq maintainers instead.

Regards,
Brian

2022-03-08 21:39:02

by Krzysztof Kozlowski

Subject: Re: [PATCH v3 01/15] dt-bindings: devfreq: rk3399_dmc: Convert to YAML

On 08/03/2022 01:09, Brian Norris wrote:
> I want to add, deprecate, and bugfix some properties, as well as add the
> first users. This is easier with a proper schema.
>
> The transformation is mostly straightforward, plus a few notable tweaks:
>
> * Renamed rockchip,dram_speed_bin to rockchip,ddr3_speed_bin. The
> driver code and the example matched, but the description was
> different. I went with the implementation. Note that this property is
> also slated for deprecation/deletion in the subsequent patches.
>
> * Drop upthreshold and downdifferential properties from the example.
> These were undocumented (so, wouldn't pass validation), but were
> representing software properties (governor tweaks). I drop them from
> the driver in subsequent patches.
>
> * Rename clock from pclk_ddr_mon to dmc_clk. The driver, DT example,
> and all downstream users matched -- the binding definition was the
> exception. Anyway, "dmc_clk" is a more appropriately generic name.
>
> Signed-off-by: Brian Norris <[email protected]>
> ---
>
> Changes in v3:
> * Add |maxItems| for devfreq-events
> * Improve deprecation notes
>
> Changes in v2:
> * rename to 'memory-controller' in example
> * place 'required' after properties
> * drop superluous free-form references and repetitions of other
> bindings
> * fix for yamllint

Apologies for jumping in late in discussion, but how about moving it to
memory-controllers or interconnect directory? devfreq is Linux specific
and DMC sounds a lot like dynamic memory controller.

>
> .../bindings/devfreq/rk3399_dmc.txt | 212 -------------
> .../bindings/devfreq/rk3399_dmc.yaml | 294 ++++++++++++++++++

file name:
rockchip,rk3399-dmc.yaml

> 2 files changed, 294 insertions(+), 212 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
> create mode 100644 Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
>
> diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
> deleted file mode 100644
> index 58fc8a6cebc7..000000000000
> --- a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
> +++ /dev/null
> @@ -1,212 +0,0 @@
> -* Rockchip rk3399 DMC (Dynamic Memory Controller) device
> -
> -Required properties:
> -- compatible: Must be "rockchip,rk3399-dmc".
> -- devfreq-events: Node to get DDR loading, Refer to
> - Documentation/devicetree/bindings/devfreq/event/
> - rockchip-dfi.txt
> -- clocks: Phandles for clock specified in "clock-names" property
> -- clock-names : The name of clock used by the DFI, must be
> - "pclk_ddr_mon";
> -- operating-points-v2: Refer to Documentation/devicetree/bindings/opp/opp-v2.yaml
> - for details.
> -- center-supply: DMC supply node.
> -- status: Marks the node enabled/disabled.
> -- rockchip,pmu: Phandle to the syscon managing the "PMU general register
> - files".
> -
> -Optional properties:
> -- interrupts: The CPU interrupt number. The interrupt specifier
> - format depends on the interrupt controller.
> - It should be a DCF interrupt. When DDR DVFS finishes
> - a DCF interrupt is triggered.
> -- rockchip,pmu: Phandle to the syscon managing the "PMU general register
> - files".
> -
> -Following properties relate to DDR timing:
> -
> -- rockchip,dram_speed_bin : Value reference include/dt-bindings/clock/rk3399-ddr.h,
> - it selects the DDR3 cl-trp-trcd type. It must be
> - set according to "Speed Bin" in DDR3 datasheet,
> - DO NOT use a smaller "Speed Bin" than specified
> - for the DDR3 being used.
> -
> -- rockchip,pd_idle : Configure the PD_IDLE value. Defines the
> - power-down idle period in which memories are
> - placed into power-down mode if bus is idle
> - for PD_IDLE DFI clock cycles.
> -
> -- rockchip,sr_idle : Configure the SR_IDLE value. Defines the
> - self-refresh idle period in which memories are
> - placed into self-refresh mode if bus is idle
> - for SR_IDLE * 1024 DFI clock cycles (DFI
> - clocks freq is half of DRAM clock), default
> - value is "0".
> -
> -- rockchip,sr_mc_gate_idle : Defines the memory self-refresh and controller
> - clock gating idle period. Memories are placed
> - into self-refresh mode and memory controller
> - clock arg gating started if bus is idle for
> - sr_mc_gate_idle*1024 DFI clock cycles.
> -
> -- rockchip,srpd_lite_idle : Defines the self-refresh power down idle
> - period in which memories are placed into
> - self-refresh power down mode if bus is idle
> - for srpd_lite_idle * 1024 DFI clock cycles.
> - This parameter is for LPDDR4 only.
> -
> -- rockchip,standby_idle : Defines the standby idle period in which
> - memories are placed into self-refresh mode.
> - The controller, pi, PHY and DRAM clock will
> - be gated if bus is idle for standby_idle * DFI
> - clock cycles.
> -
> -- rockchip,dram_dll_dis_freq : Defines the DDR3 DLL bypass frequency in MHz.
> - When DDR frequency is less than DRAM_DLL_DISB_FREQ,
> - DDR3 DLL will be bypassed. Note: if DLL was bypassed,
> - the odt will also stop working.
> -
> -- rockchip,phy_dll_dis_freq : Defines the PHY dll bypass frequency in
> - MHz (Mega Hz). When DDR frequency is less than
> - DRAM_DLL_DISB_FREQ, PHY DLL will be bypassed.
> - Note: PHY DLL and PHY ODT are independent.
> -
> -- rockchip,ddr3_odt_dis_freq : When the DRAM type is DDR3, this parameter defines
> - the ODT disable frequency in MHz (Mega Hz).
> - when the DDR frequency is less then ddr3_odt_dis_freq,
> - the ODT on the DRAM side and controller side are
> - both disabled.
> -
> -- rockchip,ddr3_drv : When the DRAM type is DDR3, this parameter defines
> - the DRAM side driver strength in ohms. Default
> - value is 40.
> -
> -- rockchip,ddr3_odt : When the DRAM type is DDR3, this parameter defines
> - the DRAM side ODT strength in ohms. Default value
> - is 120.
> -
> -- rockchip,phy_ddr3_ca_drv : When the DRAM type is DDR3, this parameter defines
> - the phy side CA line (incluing command line,
> - address line and clock line) driver strength.
> - Default value is 40.
> -
> -- rockchip,phy_ddr3_dq_drv : When the DRAM type is DDR3, this parameter defines
> - the PHY side DQ line (including DQS/DQ/DM line)
> - driver strength. Default value is 40.
> -
> -- rockchip,phy_ddr3_odt : When the DRAM type is DDR3, this parameter defines
> - the PHY side ODT strength. Default value is 240.
> -
> -- rockchip,lpddr3_odt_dis_freq : When the DRAM type is LPDDR3, this parameter defines
> - then ODT disable frequency in MHz (Mega Hz).
> - When DDR frequency is less then ddr3_odt_dis_freq,
> - the ODT on the DRAM side and controller side are
> - both disabled.
> -
> -- rockchip,lpddr3_drv : When the DRAM type is LPDDR3, this parameter defines
> - the DRAM side driver strength in ohms. Default
> - value is 34.
> -
> -- rockchip,lpddr3_odt : When the DRAM type is LPDDR3, this parameter defines
> - the DRAM side ODT strength in ohms. Default value
> - is 240.
> -
> -- rockchip,phy_lpddr3_ca_drv : When the DRAM type is LPDDR3, this parameter defines
> - the PHY side CA line (including command line,
> - address line and clock line) driver strength.
> - Default value is 40.
> -
> -- rockchip,phy_lpddr3_dq_drv : When the DRAM type is LPDDR3, this parameter defines
> - the PHY side DQ line (including DQS/DQ/DM line)
> - driver strength. Default value is 40.
> -
> -- rockchip,phy_lpddr3_odt : When dram type is LPDDR3, this parameter define
> - the phy side odt strength, default value is 240.
> -
> -- rockchip,lpddr4_odt_dis_freq : When the DRAM type is LPDDR4, this parameter
> - defines the ODT disable frequency in
> - MHz (Mega Hz). When the DDR frequency is less then
> - ddr3_odt_dis_freq, the ODT on the DRAM side and
> - controller side are both disabled.
> -
> -- rockchip,lpddr4_drv : When the DRAM type is LPDDR4, this parameter defines
> - the DRAM side driver strength in ohms. Default
> - value is 60.
> -
> -- rockchip,lpddr4_dq_odt : When the DRAM type is LPDDR4, this parameter defines
> - the DRAM side ODT on DQS/DQ line strength in ohms.
> - Default value is 40.
> -
> -- rockchip,lpddr4_ca_odt : When the DRAM type is LPDDR4, this parameter defines
> - the DRAM side ODT on CA line strength in ohms.
> - Default value is 40.
> -
> -- rockchip,phy_lpddr4_ca_drv : When the DRAM type is LPDDR4, this parameter defines
> - the PHY side CA line (including command address
> - line) driver strength. Default value is 40.
> -
> -- rockchip,phy_lpddr4_ck_cs_drv : When the DRAM type is LPDDR4, this parameter defines
> - the PHY side clock line and CS line driver
> - strength. Default value is 80.
> -
> -- rockchip,phy_lpddr4_dq_drv : When the DRAM type is LPDDR4, this parameter defines
> - the PHY side DQ line (including DQS/DQ/DM line)
> - driver strength. Default value is 80.
> -
> -- rockchip,phy_lpddr4_odt : When the DRAM type is LPDDR4, this parameter defines
> - the PHY side ODT strength. Default value is 60.
> -
> -Example:
> - dmc_opp_table: dmc_opp_table {
> - compatible = "operating-points-v2";
> -
> - opp00 {
> - opp-hz = /bits/ 64 <300000000>;
> - opp-microvolt = <900000>;
> - };
> - opp01 {
> - opp-hz = /bits/ 64 <666000000>;
> - opp-microvolt = <900000>;
> - };
> - };
> -
> - dmc: dmc {
> - compatible = "rockchip,rk3399-dmc";
> - devfreq-events = <&dfi>;
> - interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>;
> - clocks = <&cru SCLK_DDRC>;
> - clock-names = "dmc_clk";
> - operating-points-v2 = <&dmc_opp_table>;
> - center-supply = <&ppvar_centerlogic>;
> - upthreshold = <15>;
> - downdifferential = <10>;
> - rockchip,ddr3_speed_bin = <21>;
> - rockchip,pd_idle = <0x40>;
> - rockchip,sr_idle = <0x2>;
> - rockchip,sr_mc_gate_idle = <0x3>;
> - rockchip,srpd_lite_idle = <0x4>;
> - rockchip,standby_idle = <0x2000>;
> - rockchip,dram_dll_dis_freq = <300>;
> - rockchip,phy_dll_dis_freq = <125>;
> - rockchip,auto_pd_dis_freq = <666>;
> - rockchip,ddr3_odt_dis_freq = <333>;
> - rockchip,ddr3_drv = <40>;
> - rockchip,ddr3_odt = <120>;
> - rockchip,phy_ddr3_ca_drv = <40>;
> - rockchip,phy_ddr3_dq_drv = <40>;
> - rockchip,phy_ddr3_odt = <240>;
> - rockchip,lpddr3_odt_dis_freq = <333>;
> - rockchip,lpddr3_drv = <34>;
> - rockchip,lpddr3_odt = <240>;
> - rockchip,phy_lpddr3_ca_drv = <40>;
> - rockchip,phy_lpddr3_dq_drv = <40>;
> - rockchip,phy_lpddr3_odt = <240>;
> - rockchip,lpddr4_odt_dis_freq = <333>;
> - rockchip,lpddr4_drv = <60>;
> - rockchip,lpddr4_dq_odt = <40>;
> - rockchip,lpddr4_ca_odt = <40>;
> - rockchip,phy_lpddr4_ca_drv = <40>;
> - rockchip,phy_lpddr4_ck_cs_drv = <80>;
> - rockchip,phy_lpddr4_dq_drv = <80>;
> - rockchip,phy_lpddr4_odt = <60>;
> - };
> diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
> new file mode 100644
> index 000000000000..ddddddc5c6fb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
> @@ -0,0 +1,294 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# %YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/devfreq/rk3399_dmc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rockchip rk3399 DMC (Dynamic Memory Controller) device
> +
> +maintainers:
> + - Brian Norris <[email protected]>
> +
> +properties:
> + compatible:
> + enum:
> + - rockchip,rk3399-dmc
> +
> + devfreq-events:
> + $ref: /schemas/types.yaml#/definitions/phandle-array
> + minItems: 1
> + maxItems: 1

Rob previously asked about max, but it seems it is only one phandle,
right? Then the type - 'phandle'.

> + description:
> + Node to get DDR loading. Refer to
> + Documentation/devicetree/bindings/devfreq/event/rockchip-dfi.txt.
> +
> + clocks:
> + maxItems: 1
> +
> + clock-names:
> + items:
> + - const: dmc_clk
> +
> + operating-points-v2: true
> +
> + center-supply:
> + description:
> + DMC regulator supply.
> +
> + rockchip,pmu:
> + $ref: /schemas/types.yaml#/definitions/phandle
> + description:
> + Phandle to the syscon managing the "PMU general register files".
> +
> + interrupts:
> + maxItems: 1
> + description:
> + The CPU interrupt number. It should be a DCF interrupt. When DDR DVFS
> + finishes, a DCF interrupt is triggered.
> +
> + rockchip,ddr3_speed_bin:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + For values, reference include/dt-bindings/clock/rk3399-ddr.h. Selects the
> + DDR3 cl-trp-trcd type. It must be set according to "Speed Bin" in DDR3
> + datasheet; DO NOT use a smaller "Speed Bin" than specified for the DDR3
> + being used.
> +
> + rockchip,pd_idle:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Configure the PD_IDLE value. Defines the power-down idle period in which
> + memories are placed into power-down mode if bus is idle for PD_IDLE DFI
> + clock cycles.
> +
> + rockchip,sr_idle:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Configure the SR_IDLE value. Defines the self-refresh idle period in
> + which memories are placed into self-refresh mode if bus is idle for
> + SR_IDLE * 1024 DFI clock cycles (DFI clocks freq is half of DRAM clock).
> + Default value is "0".
> +
> + rockchip,sr_mc_gate_idle:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Defines the memory self-refresh and controller clock gating idle period.
> + Memories are placed into self-refresh mode and memory controller clock
> + arg gating started if bus is idle for sr_mc_gate_idle*1024 DFI clock
> + cycles.
> +
> + rockchip,srpd_lite_idle:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Defines the self-refresh power down idle period in which memories are
> + placed into self-refresh power down mode if bus is idle for
> + srpd_lite_idle * 1024 DFI clock cycles. This parameter is for LPDDR4
> + only.
> +
> + rockchip,standby_idle:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Defines the standby idle period in which memories are placed into
> + self-refresh mode. The controller, pi, PHY and DRAM clock will be gated
> + if bus is idle for standby_idle * DFI clock cycles.
> +
> + rockchip,dram_dll_dis_freq:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Defines the DDR3 DLL bypass frequency in MHz. When DDR frequency is less
> + than DRAM_DLL_DISB_FREQ, DDR3 DLL will be bypassed.
> + Note: if DLL was bypassed, the odt will also stop working.
> +
> + rockchip,phy_dll_dis_freq:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Defines the PHY dll bypass frequency in MHz (Mega Hz). When DDR frequency
> + is less than DRAM_DLL_DISB_FREQ, PHY DLL will be bypassed.
> + Note: PHY DLL and PHY ODT are independent.
> +
> + rockchip,auto_pd_dis_freq:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Defines the auto PD disable frequency in MHz.
> +
> + rockchip,ddr3_odt_dis_freq:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + When the DRAM type is DDR3, this parameter defines the ODT disable
> + frequency in MHz (Mega Hz). When the DDR frequency is less then
> + ddr3_odt_dis_freq, the ODT on the DRAM side and controller side are both
> + disabled.
> +
> + rockchip,ddr3_drv:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + When the DRAM type is DDR3, this parameter defines the DRAM side drive
> + strength in ohms. Default value is 40.
> +
> + rockchip,ddr3_odt:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + When the DRAM type is DDR3, this parameter defines the DRAM side ODT
> + strength in ohms. Default value is 120.

Here and in all other places - instead of describing default value in
description, just add "default: 120".

> +
> + rockchip,phy_ddr3_ca_drv:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + When the DRAM type is DDR3, this parameter defines the phy side CA line
> + (incluing command line, address line and clock line) drive strength.
> + Default value is 40.
> +


Best regards,
Krzysztof

2022-03-08 21:59:18

by Brian Norris

Subject: [PATCH v3 11/15] arm64: dts: rk3399: Add dfi and dmc nodes

From: Lin Huang <[email protected]>

These are required to support DDR DVFS on RK3399 platforms.

Signed-off-by: Lin Huang <[email protected]>
Signed-off-by: Enric Balletbo i Serra <[email protected]>
Signed-off-by: Gaël PORTAY <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Signed-off-by: Brian Norris <[email protected]>
Change since Daniel's posting: reordered by unit address, per existing
style

---

(no changes since v2)

Changes in v2:
- rename dmc to memory-controller

Changes in v1:
This is based on a v5 posting from various authors:
https://lore.kernel.org/lkml/[email protected]/
Much of that series was already merged, so I start over with the
numbering.

arch/arm64/boot/dts/rockchip/rk3399.dtsi | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
index 080457a68e3c..9065bb55ee7d 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
@@ -1295,6 +1295,25 @@ pwm3: pwm@ff420030 {
status = "disabled";
};

+ dfi: dfi@ff630000 {
+ reg = <0x00 0xff630000 0x00 0x4000>;
+ compatible = "rockchip,rk3399-dfi";
+ rockchip,pmu = <&pmugrf>;
+ interrupts = <GIC_SPI 131 IRQ_TYPE_LEVEL_HIGH 0>;
+ clocks = <&cru PCLK_DDR_MON>;
+ clock-names = "pclk_ddr_mon";
+ status = "disabled";
+ };
+
+ dmc: memory-controller {
+ compatible = "rockchip,rk3399-dmc";
+ rockchip,pmu = <&pmugrf>;
+ devfreq-events = <&dfi>;
+ clocks = <&cru SCLK_DDRC>;
+ clock-names = "dmc_clk";
+ status = "disabled";
+ };
+
vpu: video-codec@ff650000 {
compatible = "rockchip,rk3399-vpu";
reg = <0x0 0xff650000 0x0 0x800>;
--
2.35.1.616.g0bdcbb4464-goog

2022-03-08 23:34:20

by Brian Norris

Subject: [PATCH v3 15/15] PM / devfreq: rk3399_dmc: Avoid static (reused) profile

This static struct can get reused if the device gets removed/reprobed,
and that causes use-after-free in its ->freq_table.

Let's just move the struct to our dynamic allocation.

Signed-off-by: Brian Norris <[email protected]>
---

(no changes since v2)

Changes in v2:
* New patch

drivers/devfreq/rk3399_dmc.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index 9615658d04ae..e494d1497d60 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -38,6 +38,7 @@
struct rk3399_dmcfreq {
struct device *dev;
struct devfreq *devfreq;
+ struct devfreq_dev_profile profile;
struct devfreq_simple_ondemand_data ondemand_data;
struct clk *dmc_clk;
struct devfreq_event_dev *edev;
@@ -228,13 +229,6 @@ static int rk3399_dmcfreq_get_cur_freq(struct device *dev, unsigned long *freq)
return 0;
}

-static struct devfreq_dev_profile rk3399_devfreq_dmc_profile = {
- .polling_ms = 200,
- .target = rk3399_dmcfreq_target,
- .get_dev_status = rk3399_dmcfreq_get_dev_status,
- .get_cur_freq = rk3399_dmcfreq_get_cur_freq,
-};
-
static __maybe_unused int rk3399_dmcfreq_suspend(struct device *dev)
{
struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
@@ -422,10 +416,16 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
data->volt = dev_pm_opp_get_voltage(opp);
dev_pm_opp_put(opp);

- rk3399_devfreq_dmc_profile.initial_freq = data->rate;
+ data->profile = (struct devfreq_dev_profile) {
+ .polling_ms = 200,
+ .target = rk3399_dmcfreq_target,
+ .get_dev_status = rk3399_dmcfreq_get_dev_status,
+ .get_cur_freq = rk3399_dmcfreq_get_cur_freq,
+ .initial_freq = data->rate,
+ };

data->devfreq = devm_devfreq_add_device(dev,
- &rk3399_devfreq_dmc_profile,
+ &data->profile,
DEVFREQ_GOV_SIMPLE_ONDEMAND,
&data->ondemand_data);
if (IS_ERR(data->devfreq)) {
--
2.35.1.616.g0bdcbb4464-goog

2022-03-09 00:07:15

by Krzysztof Kozlowski

Subject: Re: [PATCH v3 04/15] dt-bindings: devfreq: rk3399_dmc: Specify idle params in nanoseconds

On 08/03/2022 01:09, Brian Norris wrote:
> It's inefficient to use the same number of cycles for all OPPs, since
> lower frequencies make for longer idle times. Let's specify the idle
> time instead, so software can pick the optimal number of cycles on its
> own.
>
> NB: these bindings aren't used anywhere yet.
>
> Signed-off-by: Brian Norris <[email protected]>
> Reviewed-by: Rob Herring <[email protected]>
> ---
>
> Changes in v3:
> * Add Reviewed-by
>
> Changes in v2:
> * New patch
>
> .../bindings/devfreq/rk3399_dmc.yaml | 50 +++++++++++++++++--
> 1 file changed, 45 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
> index 2904ae4115f3..6a33a7b44741 100644
> --- a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
> +++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.yaml
> @@ -56,42 +56,52 @@ properties:
> being used.
>
> rockchip,pd_idle:
> + deprecated: true
> $ref: /schemas/types.yaml#/definitions/uint32
> description:
> Configure the PD_IDLE value. Defines the power-down idle period in which
> memories are placed into power-down mode if bus is idle for PD_IDLE DFI
> clock cycles.
> + See also rockchip,pd-idle-ns.
>
> rockchip,sr_idle:
> + deprecated: true
> $ref: /schemas/types.yaml#/definitions/uint32
> description:
> Configure the SR_IDLE value. Defines the self-refresh idle period in
> which memories are placed into self-refresh mode if bus is idle for
> SR_IDLE * 1024 DFI clock cycles (DFI clocks freq is half of DRAM clock).
> Default value is "0".
> + See also rockchip,sr-idle-ns.
>
> rockchip,sr_mc_gate_idle:
> + deprecated: true
> $ref: /schemas/types.yaml#/definitions/uint32
> description:
> Defines the memory self-refresh and controller clock gating idle period.
> Memories are placed into self-refresh mode and memory controller clock
> arg gating started if bus is idle for sr_mc_gate_idle*1024 DFI clock
> cycles.
> + See also rockchip,sr-mc-gate-idle-ns.
>
> rockchip,srpd_lite_idle:
> + deprecated: true
> $ref: /schemas/types.yaml#/definitions/uint32
> description:
> Defines the self-refresh power down idle period in which memories are
> placed into self-refresh power down mode if bus is idle for
> srpd_lite_idle * 1024 DFI clock cycles. This parameter is for LPDDR4
> only.
> + See also rockchip,srpd-lite-idle-ns.
>
> rockchip,standby_idle:
> + deprecated: true
> $ref: /schemas/types.yaml#/definitions/uint32
> description:
> Defines the standby idle period in which memories are placed into
> self-refresh mode. The controller, pi, PHY and DRAM clock will be gated
> if bus is idle for standby_idle * DFI clock cycles.
> + See also rockchip,standby-idle-ns.
>
> rockchip,dram_dll_dis_freq:
> deprecated: true
> @@ -260,6 +270,36 @@ properties:
> When the DRAM type is LPDDR4, this parameter defines the PHY side ODT
> strength. Default value is 60.
>
> + rockchip,pd-idle-ns:
> + description:
> + Configure the PD_IDLE value in nanoseconds. Defines the power-down idle
> + period in which memories are placed into power-down mode if bus is idle
> + for PD_IDLE nanoseconds.
> +
> + rockchip,sr-idle-ns:
> + description:
> + Configure the SR_IDLE value in nanoseconds. Defines the self-refresh idle
> + period in which memories are placed into self-refresh mode if bus is idle
> + for SR_IDLE nanoseconds. Default value is "0".

Use "default: 0".



Reviewed-by: Krzysztof Kozlowski <[email protected]>


Best regards,
Krzysztof

2022-03-09 00:47:14

by Krzysztof Kozlowski

Subject: Re: [PATCH v3 05/15] dt-bindings: devfreq: rk3399_dmc: Add more disable-freq properties

On 08/03/2022 01:09, Brian Norris wrote:
> DDR DVFS tuning has found that several power-saving features don't have
> good tradeoffs at higher frequencies -- at higher frequencies, we'll see
> glitches or other errors. Provide tuning controls so these can be
> disabled at higher OPPs, and left active only at the lower ones.
>
> Signed-off-by: Brian Norris <[email protected]>
> Reviewed-by: Rob Herring <[email protected]>
> ---
>
> Changes in v3:
> * Add Reviewed-by
>
> Changes in v2:
> * hyphens, not underscores
> * *-hz units, and drop the types definition
>
> .../bindings/devfreq/rk3399_dmc.yaml | 37 +++++++++++++++++++
> 1 file changed, 37 insertions(+)
>

Reviewed-by: Krzysztof Kozlowski <[email protected]>

Best regards,
Krzysztof

2022-03-09 00:49:55

by Brian Norris

Subject: [PATCH v3 06/15] PM / devfreq: rk3399_dmc: Drop undocumented ondemand DT props

These properties are:

* undocumented
* directly representing software properties, not hardware properties
* unused (no in-tree users, yet; this IP block has so far only been used
in downstream kernels)

Let's just stick the values that downstream users have been using
directly in the driver and call it a day.

Signed-off-by: Brian Norris <[email protected]>
---

(no changes since v1)

drivers/devfreq/rk3399_dmc.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index 293857ebfd75..e982862f6ac2 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -430,10 +430,8 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
goto err_edev;
}

- of_property_read_u32(np, "upthreshold",
- &data->ondemand_data.upthreshold);
- of_property_read_u32(np, "downdifferential",
- &data->ondemand_data.downdifferential);
+ data->ondemand_data.upthreshold = 25;
+ data->ondemand_data.downdifferential = 15;

data->rate = clk_get_rate(data->dmc_clk);

--
2.35.1.616.g0bdcbb4464-goog

2022-03-09 00:54:45

by Krzysztof Kozlowski

Subject: Re: [PATCH v3 02/15] dt-bindings: devfreq: rk3399_dmc: Deprecate unused/redundant properties

On 08/03/2022 01:09, Brian Norris wrote:
> These DRAM configuration properties are all handled in ARM Trusted
> Firmware (and have been since the early days of this SoC), and there are
> no in-tree users of the DMC binding yet. It's better to just defer to
> firmware instead of maintaining this large list of properties.
>
> There's also some confusion about units: many of these are specified in
> MHz, but the downstream users and driver code are treating them as Hz, I
> believe. Rather than straighten all that out, I just drop them.
>
> Signed-off-by: Brian Norris <[email protected]>
> Reviewed-by: Rob Herring <[email protected]>
> * Add Reviewed-by tags

Messed up commit msg.

>
> ---
>
> Changes in v3:
> * Add Reviewed-by
>
> .../bindings/devfreq/rk3399_dmc.yaml | 42 +++++++++----------
> 1 file changed, 21 insertions(+), 21 deletions(-)
>


Reviewed-by: Krzysztof Kozlowski <[email protected]>


Best regards,
Krzysztof

2022-03-09 01:08:37

by Krzysztof Kozlowski

Subject: Re: [PATCH v3 03/15] dt-bindings: devfreq: rk3399_dmc: Fix Hz units

On 08/03/2022 01:09, Brian Norris wrote:
> The driver and all downstream device trees [1] are using Hz units, but
> the document claims MHz. DRAM frequency for these systems can't possibly
> exceed 2^32-1 Hz, so the choice of unit doesn't really matter than much.
>
> Rather than add unnecessary risk in getting the units wrong, let's just
> go with the unofficial convention and make the docs match reality.
>
> A sub-1MHz frequency is extremely unlikely, so include a minimum in the
> schema, to help catch anybody who might have believed this was MHz.
>
> [1] And notably, also those trying to upstream them:
> https://lore.kernel.org/lkml/[email protected]/
>
> Signed-off-by: Brian Norris <[email protected]>
> Reviewed-by: Rob Herring <[email protected]>
> Acked-by: Chanwoo Choi <[email protected]>
> ---
>
> Changes in v3:
> * Add Reviewed-by, Acked-by
>


Reviewed-by: Krzysztof Kozlowski <[email protected]>


Best regards,
Krzysztof