diff mbox series

venus: pm_helpers: Control core power domain manually

Message ID 20210109072130.784-1-stanimir.varbanov@linaro.org
State New
Headers show
Series venus: pm_helpers: Control core power domain manually | expand

Commit Message

Stanimir Varbanov Jan. 9, 2021, 7:21 a.m. UTC
Presently we use device_link to control core power domain. But this
leads to issues because the genpd doesn't guarantee synchronous on/off
for supplier devices. Switch to manually control by pmruntime calls.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
---
 drivers/media/platform/qcom/venus/core.h      |  1 -
 .../media/platform/qcom/venus/pm_helpers.c    | 36 ++++++++++---------
 2 files changed, 19 insertions(+), 18 deletions(-)

Comments

Fritz Koenig Jan. 11, 2021, 10:05 p.m. UTC | #1
On Fri, Jan 8, 2021 at 11:23 PM Stanimir Varbanov
<stanimir.varbanov@linaro.org> wrote:
>
> Presently we use device_link to control core power domain. But this
> leads to issues because the genpd doesn't guarantee synchronous on/off
> for supplier devices. Switch to manually control by pmruntime calls.
>
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
> ---
>  drivers/media/platform/qcom/venus/core.h      |  1 -
>  .../media/platform/qcom/venus/pm_helpers.c    | 36 ++++++++++---------
>  2 files changed, 19 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
> index dfc13b2f371f..74d9fd3d51cc 100644
> --- a/drivers/media/platform/qcom/venus/core.h
> +++ b/drivers/media/platform/qcom/venus/core.h
> @@ -128,7 +128,6 @@ struct venus_core {
>         struct icc_path *cpucfg_path;
>         struct opp_table *opp_table;
>         bool has_opp_table;
> -       struct device_link *pd_dl_venus;

remove from comment at start of struct as well.
 * @pd_dl_venus: pmdomain device-link for venus domain

The patch gives huge improvements in encoder stability!

Tested-by: Fritz Koenig <frkoenig@chromium.org>



>         struct device *pmdomains[VIDC_PMDOMAINS_NUM_MAX];
>         struct device_link *opp_dl_venus;
>         struct device *opp_pmdomain;
> diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
> index 94219a3093cb..e0338932a720 100644
> --- a/drivers/media/platform/qcom/venus/pm_helpers.c
> +++ b/drivers/media/platform/qcom/venus/pm_helpers.c
> @@ -774,13 +774,6 @@ static int vcodec_domains_get(struct device *dev)
>                 core->pmdomains[i] = pd;
>         }
>
> -       core->pd_dl_venus = device_link_add(dev, core->pmdomains[0],
> -                                           DL_FLAG_PM_RUNTIME |
> -                                           DL_FLAG_STATELESS |
> -                                           DL_FLAG_RPM_ACTIVE);
> -       if (!core->pd_dl_venus)
> -               return -ENODEV;
> -
>  skip_pmdomains:
>         if (!core->has_opp_table)
>                 return 0;
> @@ -807,14 +800,12 @@ static int vcodec_domains_get(struct device *dev)
>  opp_dl_add_err:
>         dev_pm_opp_detach_genpd(core->opp_table);
>  opp_attach_err:
> -       if (core->pd_dl_venus) {
> -               device_link_del(core->pd_dl_venus);
> -               for (i = 0; i < res->vcodec_pmdomains_num; i++) {
> -                       if (IS_ERR_OR_NULL(core->pmdomains[i]))
> -                               continue;
> -                       dev_pm_domain_detach(core->pmdomains[i], true);
> -               }
> +       for (i = 0; i < res->vcodec_pmdomains_num; i++) {
> +               if (IS_ERR_OR_NULL(core->pmdomains[i]))
> +                       continue;
> +               dev_pm_domain_detach(core->pmdomains[i], true);
>         }
> +
>         return ret;
>  }
>
> @@ -827,9 +818,6 @@ static void vcodec_domains_put(struct device *dev)
>         if (!res->vcodec_pmdomains_num)
>                 goto skip_pmdomains;
>
> -       if (core->pd_dl_venus)
> -               device_link_del(core->pd_dl_venus);
> -
>         for (i = 0; i < res->vcodec_pmdomains_num; i++) {
>                 if (IS_ERR_OR_NULL(core->pmdomains[i]))
>                         continue;
> @@ -917,16 +905,30 @@ static void core_put_v4(struct device *dev)
>  static int core_power_v4(struct device *dev, int on)
>  {
>         struct venus_core *core = dev_get_drvdata(dev);
> +       struct device *pmctrl = core->pmdomains[0];
>         int ret = 0;
>
>         if (on == POWER_ON) {
> +               if (pmctrl) {
> +                       ret = pm_runtime_get_sync(pmctrl);
> +                       if (ret < 0) {
> +                               pm_runtime_put_noidle(pmctrl);
> +                               return ret;
> +                       }
> +               }
> +
>                 ret = core_clks_enable(core);
> +               if (ret < 0 && pmctrl)
> +                       pm_runtime_put_sync(pmctrl);
>         } else {
>                 /* Drop the performance state vote */
>                 if (core->opp_pmdomain)
>                         dev_pm_opp_set_rate(dev, 0);
>
>                 core_clks_disable(core);
> +
> +               if (pmctrl)
> +                       pm_runtime_put_sync(pmctrl);
>         }
>
>         return ret;
> --
> 2.17.1
>
diff mbox series

Patch

diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
index dfc13b2f371f..74d9fd3d51cc 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -128,7 +128,6 @@  struct venus_core {
 	struct icc_path *cpucfg_path;
 	struct opp_table *opp_table;
 	bool has_opp_table;
-	struct device_link *pd_dl_venus;
 	struct device *pmdomains[VIDC_PMDOMAINS_NUM_MAX];
 	struct device_link *opp_dl_venus;
 	struct device *opp_pmdomain;
diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
index 94219a3093cb..e0338932a720 100644
--- a/drivers/media/platform/qcom/venus/pm_helpers.c
+++ b/drivers/media/platform/qcom/venus/pm_helpers.c
@@ -774,13 +774,6 @@  static int vcodec_domains_get(struct device *dev)
 		core->pmdomains[i] = pd;
 	}
 
-	core->pd_dl_venus = device_link_add(dev, core->pmdomains[0],
-					    DL_FLAG_PM_RUNTIME |
-					    DL_FLAG_STATELESS |
-					    DL_FLAG_RPM_ACTIVE);
-	if (!core->pd_dl_venus)
-		return -ENODEV;
-
 skip_pmdomains:
 	if (!core->has_opp_table)
 		return 0;
@@ -807,14 +800,12 @@  static int vcodec_domains_get(struct device *dev)
 opp_dl_add_err:
 	dev_pm_opp_detach_genpd(core->opp_table);
 opp_attach_err:
-	if (core->pd_dl_venus) {
-		device_link_del(core->pd_dl_venus);
-		for (i = 0; i < res->vcodec_pmdomains_num; i++) {
-			if (IS_ERR_OR_NULL(core->pmdomains[i]))
-				continue;
-			dev_pm_domain_detach(core->pmdomains[i], true);
-		}
+	for (i = 0; i < res->vcodec_pmdomains_num; i++) {
+		if (IS_ERR_OR_NULL(core->pmdomains[i]))
+			continue;
+		dev_pm_domain_detach(core->pmdomains[i], true);
 	}
+
 	return ret;
 }
 
@@ -827,9 +818,6 @@  static void vcodec_domains_put(struct device *dev)
 	if (!res->vcodec_pmdomains_num)
 		goto skip_pmdomains;
 
-	if (core->pd_dl_venus)
-		device_link_del(core->pd_dl_venus);
-
 	for (i = 0; i < res->vcodec_pmdomains_num; i++) {
 		if (IS_ERR_OR_NULL(core->pmdomains[i]))
 			continue;
@@ -917,16 +905,30 @@  static void core_put_v4(struct device *dev)
 static int core_power_v4(struct device *dev, int on)
 {
 	struct venus_core *core = dev_get_drvdata(dev);
+	struct device *pmctrl = core->pmdomains[0];
 	int ret = 0;
 
 	if (on == POWER_ON) {
+		if (pmctrl) {
+			ret = pm_runtime_get_sync(pmctrl);
+			if (ret < 0) {
+				pm_runtime_put_noidle(pmctrl);
+				return ret;
+			}
+		}
+
 		ret = core_clks_enable(core);
+		if (ret < 0 && pmctrl)
+			pm_runtime_put_sync(pmctrl);
 	} else {
 		/* Drop the performance state vote */
 		if (core->opp_pmdomain)
 			dev_pm_opp_set_rate(dev, 0);
 
 		core_clks_disable(core);
+
+		if (pmctrl)
+			pm_runtime_put_sync(pmctrl);
 	}
 
 	return ret;