[PATCH 1/2] drm/panfrost: missing remove opp table in case of failure

[PATCH 1/2] drm/panfrost: missing remove opp table in case of failure

[Clément Péron]

In case of failure we need to remove OPP table.

Use Linux classic error handling with goto usage.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
---
 drivers/gpu/drm/panfrost/panfrost_devfreq.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index 413987038fbf..62541f4edd81 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -90,8 +90,11 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 	cur_freq = clk_get_rate(pfdev->clock);
 
 	opp = devfreq_recommended_opp(dev, &cur_freq, 0);
-	if (IS_ERR(opp))
-		return PTR_ERR(opp);
+	if (IS_ERR(opp)) {
+		DRM_DEV_ERROR(dev, "Failed to set recommended OPP\n");
+		ret = PTR_ERR(opp);
+		goto err_opp;
+	}
 
 	panfrost_devfreq_profile.initial_freq = cur_freq;
 	dev_pm_opp_put(opp);
@@ -100,8 +103,8 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 					  DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL);
 	if (IS_ERR(devfreq)) {
 		DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
-		dev_pm_opp_of_remove_table(dev);
-		return PTR_ERR(devfreq);
+		ret = PTR_ERR(devfreq);
+		goto err_opp;
 	}
 	pfdev->devfreq.devfreq = devfreq;
 
@@ -112,6 +115,11 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 		pfdev->devfreq.cooling = cooling;
 
 	return 0;
+
+err_opp:
+	dev_pm_opp_of_remove_table(dev);
+
+	return ret;
 }
 
 void panfrost_devfreq_fini(struct panfrost_device *pfdev)
-- 
2.20.1

[PATCH 1/2] drm/panfrost: missing remove opp table in case of failure

[Clément Péron]

In case of failure we need to remove OPP table.

Use Linux classic error handling with goto usage.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
---
 drivers/gpu/drm/panfrost/panfrost_devfreq.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index 413987038fbf..62541f4edd81 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -90,8 +90,11 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 	cur_freq = clk_get_rate(pfdev->clock);
 
 	opp = devfreq_recommended_opp(dev, &cur_freq, 0);
-	if (IS_ERR(opp))
-		return PTR_ERR(opp);
+	if (IS_ERR(opp)) {
+		DRM_DEV_ERROR(dev, "Failed to set recommended OPP\n");
+		ret = PTR_ERR(opp);
+		goto err_opp;
+	}
 
 	panfrost_devfreq_profile.initial_freq = cur_freq;
 	dev_pm_opp_put(opp);
@@ -100,8 +103,8 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 					  DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL);
 	if (IS_ERR(devfreq)) {
 		DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
-		dev_pm_opp_of_remove_table(dev);
-		return PTR_ERR(devfreq);
+		ret = PTR_ERR(devfreq);
+		goto err_opp;
 	}
 	pfdev->devfreq.devfreq = devfreq;
 
@@ -112,6 +115,11 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 		pfdev->devfreq.cooling = cooling;
 
 	return 0;
+
+err_opp:
+	dev_pm_opp_of_remove_table(dev);
+
+	return ret;
 }
 
 void panfrost_devfreq_fini(struct panfrost_device *pfdev)
-- 
2.20.1

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[PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

OPP table can defined both frequency and voltage.

Register the mali regulator if it exist.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
---
 drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
 drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
 2 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index 62541f4edd81..2dc8e2355358 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 	struct device *dev = &pfdev->pdev->dev;
 	struct devfreq *devfreq;
 	struct thermal_cooling_device *cooling;
+	const char *mali = "mali";
+	struct opp_table *opp_table = NULL;
+
+	/* Regulator is optional */
+	opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
+	if (IS_ERR(opp_table)) {
+		ret = PTR_ERR(opp_table);
+		if (ret != -ENODEV) {
+			DRM_DEV_ERROR(dev, "Failed to set regulator: %d\n", ret);
+			return ret;
+		}
+	}
+	pfdev->devfreq.opp_table = opp_table;
 
 	ret = dev_pm_opp_of_add_table(dev);
-	if (ret == -ENODEV) /* Optional, continue without devfreq */
-		return 0;
-	else if (ret)
-		return ret;
+	if (ret) {
+		if (ret == -ENODEV) /* Optional, continue without devfreq */
+			ret = 0;
+		goto err_opp_reg;
+	}
 
 	panfrost_devfreq_reset(pfdev);
 
@@ -119,6 +133,12 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 err_opp:
 	dev_pm_opp_of_remove_table(dev);
 
+err_opp_reg:
+	if (pfdev->devfreq.opp_table) {
+		dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
+		pfdev->devfreq.opp_table = NULL;
+	}
+
 	return ret;
 }
 
@@ -126,7 +146,13 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
 {
 	if (pfdev->devfreq.cooling)
 		devfreq_cooling_unregister(pfdev->devfreq.cooling);
+
 	dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
+
+	if (pfdev->devfreq.opp_table) {
+		dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
+		pfdev->devfreq.opp_table = NULL;
+	}
 }
 
 void panfrost_devfreq_resume(struct panfrost_device *pfdev)
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index 06713811b92c..f6b0c779dfe5 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -86,6 +86,7 @@ struct panfrost_device {
 	struct {
 		struct devfreq *devfreq;
 		struct thermal_cooling_device *cooling;
+		struct opp_table *opp_table;
 		ktime_t busy_time;
 		ktime_t idle_time;
 		ktime_t time_last_update;
-- 
2.20.1

[PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

OPP table can defined both frequency and voltage.

Register the mali regulator if it exist.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
---
 drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
 drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
 2 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index 62541f4edd81..2dc8e2355358 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 	struct device *dev = &pfdev->pdev->dev;
 	struct devfreq *devfreq;
 	struct thermal_cooling_device *cooling;
+	const char *mali = "mali";
+	struct opp_table *opp_table = NULL;
+
+	/* Regulator is optional */
+	opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
+	if (IS_ERR(opp_table)) {
+		ret = PTR_ERR(opp_table);
+		if (ret != -ENODEV) {
+			DRM_DEV_ERROR(dev, "Failed to set regulator: %d\n", ret);
+			return ret;
+		}
+	}
+	pfdev->devfreq.opp_table = opp_table;
 
 	ret = dev_pm_opp_of_add_table(dev);
-	if (ret == -ENODEV) /* Optional, continue without devfreq */
-		return 0;
-	else if (ret)
-		return ret;
+	if (ret) {
+		if (ret == -ENODEV) /* Optional, continue without devfreq */
+			ret = 0;
+		goto err_opp_reg;
+	}
 
 	panfrost_devfreq_reset(pfdev);
 
@@ -119,6 +133,12 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 err_opp:
 	dev_pm_opp_of_remove_table(dev);
 
+err_opp_reg:
+	if (pfdev->devfreq.opp_table) {
+		dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
+		pfdev->devfreq.opp_table = NULL;
+	}
+
 	return ret;
 }
 
@@ -126,7 +146,13 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
 {
 	if (pfdev->devfreq.cooling)
 		devfreq_cooling_unregister(pfdev->devfreq.cooling);
+
 	dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
+
+	if (pfdev->devfreq.opp_table) {
+		dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
+		pfdev->devfreq.opp_table = NULL;
+	}
 }
 
 void panfrost_devfreq_resume(struct panfrost_device *pfdev)
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index 06713811b92c..f6b0c779dfe5 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -86,6 +86,7 @@ struct panfrost_device {
 	struct {
 		struct devfreq *devfreq;
 		struct thermal_cooling_device *cooling;
+		struct opp_table *opp_table;
 		ktime_t busy_time;
 		ktime_t idle_time;
 		ktime_t time_last_update;
-- 
2.20.1

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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Panfrost and OPP Maintainers,

On Sat, 11 Apr 2020 at 22:06, Clément Péron <peron.clem@gmail.com> wrote:
>
> OPP table can defined both frequency and voltage.
>
> Register the mali regulator if it exist.

After this patch, Panfrost update properly both voltage and frequency.
But the GPU is still not properly down-clocked when temperature is high.

I try to add a cooling map like this :
https://github.com/clementperon/linux/commit/955961c7c035abbf44e74f608fe8f059c06a2fbe

But got the following error:
[    2.712082] panfrost 1800000.gpu: [drm:panfrost_devfreq_init
[panfrost]] Failed to register cooling device

Do you see what I'm missing?

Thanks for your help,
Clement



>
> Signed-off-by: Clément Péron <peron.clem@gmail.com>
> ---
>  drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
>  drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
>  2 files changed, 31 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> index 62541f4edd81..2dc8e2355358 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>         struct device *dev = &pfdev->pdev->dev;
>         struct devfreq *devfreq;
>         struct thermal_cooling_device *cooling;
> +       const char *mali = "mali";
> +       struct opp_table *opp_table = NULL;
> +
> +       /* Regulator is optional */
> +       opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
> +       if (IS_ERR(opp_table)) {
> +               ret = PTR_ERR(opp_table);
> +               if (ret != -ENODEV) {
> +                       DRM_DEV_ERROR(dev, "Failed to set regulator: %d\n", ret);
> +                       return ret;
> +               }
> +       }
> +       pfdev->devfreq.opp_table = opp_table;
>
>         ret = dev_pm_opp_of_add_table(dev);
> -       if (ret == -ENODEV) /* Optional, continue without devfreq */
> -               return 0;
> -       else if (ret)
> -               return ret;
> +       if (ret) {
> +               if (ret == -ENODEV) /* Optional, continue without devfreq */
> +                       ret = 0;
> +               goto err_opp_reg;
> +       }
>
>         panfrost_devfreq_reset(pfdev);
>
> @@ -119,6 +133,12 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>  err_opp:
>         dev_pm_opp_of_remove_table(dev);
>
> +err_opp_reg:
> +       if (pfdev->devfreq.opp_table) {
> +               dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> +               pfdev->devfreq.opp_table = NULL;
> +       }
> +
>         return ret;
>  }
>
> @@ -126,7 +146,13 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
>  {
>         if (pfdev->devfreq.cooling)
>                 devfreq_cooling_unregister(pfdev->devfreq.cooling);
> +
>         dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
> +
> +       if (pfdev->devfreq.opp_table) {
> +               dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> +               pfdev->devfreq.opp_table = NULL;
> +       }
>  }
>
>  void panfrost_devfreq_resume(struct panfrost_device *pfdev)
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> index 06713811b92c..f6b0c779dfe5 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> @@ -86,6 +86,7 @@ struct panfrost_device {
>         struct {
>                 struct devfreq *devfreq;
>                 struct thermal_cooling_device *cooling;
> +               struct opp_table *opp_table;
>                 ktime_t busy_time;
>                 ktime_t idle_time;
>                 ktime_t time_last_update;
> --
> 2.20.1
>

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Panfrost and OPP Maintainers,

On Sat, 11 Apr 2020 at 22:06, Clément Péron <peron.clem@gmail.com> wrote:
>
> OPP table can defined both frequency and voltage.
>
> Register the mali regulator if it exist.

After this patch, Panfrost update properly both voltage and frequency.
But the GPU is still not properly down-clocked when temperature is high.

I try to add a cooling map like this :
https://github.com/clementperon/linux/commit/955961c7c035abbf44e74f608fe8f059c06a2fbe

But got the following error:
[    2.712082] panfrost 1800000.gpu: [drm:panfrost_devfreq_init
[panfrost]] Failed to register cooling device

Do you see what I'm missing?

Thanks for your help,
Clement



>
> Signed-off-by: Clément Péron <peron.clem@gmail.com>
> ---
>  drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
>  drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
>  2 files changed, 31 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> index 62541f4edd81..2dc8e2355358 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>         struct device *dev = &pfdev->pdev->dev;
>         struct devfreq *devfreq;
>         struct thermal_cooling_device *cooling;
> +       const char *mali = "mali";
> +       struct opp_table *opp_table = NULL;
> +
> +       /* Regulator is optional */
> +       opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
> +       if (IS_ERR(opp_table)) {
> +               ret = PTR_ERR(opp_table);
> +               if (ret != -ENODEV) {
> +                       DRM_DEV_ERROR(dev, "Failed to set regulator: %d\n", ret);
> +                       return ret;
> +               }
> +       }
> +       pfdev->devfreq.opp_table = opp_table;
>
>         ret = dev_pm_opp_of_add_table(dev);
> -       if (ret == -ENODEV) /* Optional, continue without devfreq */
> -               return 0;
> -       else if (ret)
> -               return ret;
> +       if (ret) {
> +               if (ret == -ENODEV) /* Optional, continue without devfreq */
> +                       ret = 0;
> +               goto err_opp_reg;
> +       }
>
>         panfrost_devfreq_reset(pfdev);
>
> @@ -119,6 +133,12 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>  err_opp:
>         dev_pm_opp_of_remove_table(dev);
>
> +err_opp_reg:
> +       if (pfdev->devfreq.opp_table) {
> +               dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> +               pfdev->devfreq.opp_table = NULL;
> +       }
> +
>         return ret;
>  }
>
> @@ -126,7 +146,13 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
>  {
>         if (pfdev->devfreq.cooling)
>                 devfreq_cooling_unregister(pfdev->devfreq.cooling);
> +
>         dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
> +
> +       if (pfdev->devfreq.opp_table) {
> +               dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> +               pfdev->devfreq.opp_table = NULL;
> +       }
>  }
>
>  void panfrost_devfreq_resume(struct panfrost_device *pfdev)
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> index 06713811b92c..f6b0c779dfe5 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> @@ -86,6 +86,7 @@ struct panfrost_device {
>         struct {
>                 struct devfreq *devfreq;
>                 struct thermal_cooling_device *cooling;
> +               struct opp_table *opp_table;
>                 ktime_t busy_time;
>                 ktime_t idle_time;
>                 ktime_t time_last_update;
> --
> 2.20.1
>
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Re: [PATCH 1/2] drm/panfrost: missing remove opp table in case of failure

[Steven Price]

On 11/04/2020 21:06, Clément Péron wrote:
> In case of failure we need to remove OPP table.
> 
> Use Linux classic error handling with goto usage.
> 
> Signed-off-by: Clément Péron <peron.clem@gmail.com>

Reviewed-by: Steven Price <steven.price@arm.com>

> ---
>   drivers/gpu/drm/panfrost/panfrost_devfreq.c | 16 ++++++++++++----
>   1 file changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> index 413987038fbf..62541f4edd81 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> @@ -90,8 +90,11 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>   	cur_freq = clk_get_rate(pfdev->clock);
>   
>   	opp = devfreq_recommended_opp(dev, &cur_freq, 0);
> -	if (IS_ERR(opp))
> -		return PTR_ERR(opp);
> +	if (IS_ERR(opp)) {
> +		DRM_DEV_ERROR(dev, "Failed to set recommended OPP\n");
> +		ret = PTR_ERR(opp);
> +		goto err_opp;
> +	}
>   
>   	panfrost_devfreq_profile.initial_freq = cur_freq;
>   	dev_pm_opp_put(opp);
> @@ -100,8 +103,8 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>   					  DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL);
>   	if (IS_ERR(devfreq)) {
>   		DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
> -		dev_pm_opp_of_remove_table(dev);
> -		return PTR_ERR(devfreq);
> +		ret = PTR_ERR(devfreq);
> +		goto err_opp;
>   	}
>   	pfdev->devfreq.devfreq = devfreq;
>   
> @@ -112,6 +115,11 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>   		pfdev->devfreq.cooling = cooling;
>   
>   	return 0;
> +
> +err_opp:
> +	dev_pm_opp_of_remove_table(dev);
> +
> +	return ret;
>   }
>   
>   void panfrost_devfreq_fini(struct panfrost_device *pfdev)
> 

Re: [PATCH 1/2] drm/panfrost: missing remove opp table in case of failure

[Steven Price]

On 11/04/2020 21:06, Clément Péron wrote:
> In case of failure we need to remove OPP table.
> 
> Use Linux classic error handling with goto usage.
> 
> Signed-off-by: Clément Péron <peron.clem@gmail.com>

Reviewed-by: Steven Price <steven.price@arm.com>

> ---
>   drivers/gpu/drm/panfrost/panfrost_devfreq.c | 16 ++++++++++++----
>   1 file changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> index 413987038fbf..62541f4edd81 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> @@ -90,8 +90,11 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>   	cur_freq = clk_get_rate(pfdev->clock);
>   
>   	opp = devfreq_recommended_opp(dev, &cur_freq, 0);
> -	if (IS_ERR(opp))
> -		return PTR_ERR(opp);
> +	if (IS_ERR(opp)) {
> +		DRM_DEV_ERROR(dev, "Failed to set recommended OPP\n");
> +		ret = PTR_ERR(opp);
> +		goto err_opp;
> +	}
>   
>   	panfrost_devfreq_profile.initial_freq = cur_freq;
>   	dev_pm_opp_put(opp);
> @@ -100,8 +103,8 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>   					  DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL);
>   	if (IS_ERR(devfreq)) {
>   		DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
> -		dev_pm_opp_of_remove_table(dev);
> -		return PTR_ERR(devfreq);
> +		ret = PTR_ERR(devfreq);
> +		goto err_opp;
>   	}
>   	pfdev->devfreq.devfreq = devfreq;
>   
> @@ -112,6 +115,11 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>   		pfdev->devfreq.cooling = cooling;
>   
>   	return 0;
> +
> +err_opp:
> +	dev_pm_opp_of_remove_table(dev);
> +
> +	return ret;
>   }
>   
>   void panfrost_devfreq_fini(struct panfrost_device *pfdev)
> 

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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Steven Price]

On 11/04/2020 21:06, Clément Péron wrote:
> OPP table can defined both frequency and voltage.
> 
> Register the mali regulator if it exist.
> 
> Signed-off-by: Clément Péron <peron.clem@gmail.com>
> ---
>   drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
>   drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
>   2 files changed, 31 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> index 62541f4edd81..2dc8e2355358 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>   	struct device *dev = &pfdev->pdev->dev;
>   	struct devfreq *devfreq;
>   	struct thermal_cooling_device *cooling;
> +	const char *mali = "mali";
> +	struct opp_table *opp_table = NULL;
> +
> +	/* Regulator is optional */
> +	opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);

This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add 
support for multiple regulators") which is currently in drm-misc-next 
(and linux-next). You want something more like:

     opp_table = dev_pm_opp_set_regulators(dev,
                                           pfdev->comp->supply_names,
                                           pfdev->comp->num_supplies);

Otherwise a platform with multiple regulators won't work correctly.

Also running on my firefly (RK3288) board I get the following warning:

    debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already 
present!

This is due to the regulator debugfs entries getting created twice (once 
in panfrost_regulator_init() and once here).

I have been taking a look at doing the same thing (I picked up Martin 
Blumenstingl's patch series[1]), but haven't had much time to focus on 
this recently.

Thanks,

Steve

[1] 
https://lore.kernel.org/dri-devel/20200112001623.2121227-1-martin.blumenstingl@googlemail.com/


> +	if (IS_ERR(opp_table)) {
> +		ret = PTR_ERR(opp_table);
> +		if (ret != -ENODEV) {
> +			DRM_DEV_ERROR(dev, "Failed to set regulator: %d\n", ret);
> +			return ret;
> +		}
> +	}
> +	pfdev->devfreq.opp_table = opp_table;
>   
>   	ret = dev_pm_opp_of_add_table(dev);
> -	if (ret == -ENODEV) /* Optional, continue without devfreq */
> -		return 0;
> -	else if (ret)
> -		return ret;
> +	if (ret) {
> +		if (ret == -ENODEV) /* Optional, continue without devfreq */
> +			ret = 0;
> +		goto err_opp_reg;
> +	}
>   
>   	panfrost_devfreq_reset(pfdev);
>   
> @@ -119,6 +133,12 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>   err_opp:
>   	dev_pm_opp_of_remove_table(dev);
>   
> +err_opp_reg:
> +	if (pfdev->devfreq.opp_table) {
> +		dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> +		pfdev->devfreq.opp_table = NULL;
> +	}
> +
>   	return ret;
>   }
>   
> @@ -126,7 +146,13 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
>   {
>   	if (pfdev->devfreq.cooling)
>   		devfreq_cooling_unregister(pfdev->devfreq.cooling);
> +
>   	dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
> +
> +	if (pfdev->devfreq.opp_table) {
> +		dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> +		pfdev->devfreq.opp_table = NULL;
> +	}
>   }
>   
>   void panfrost_devfreq_resume(struct panfrost_device *pfdev)
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> index 06713811b92c..f6b0c779dfe5 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> @@ -86,6 +86,7 @@ struct panfrost_device {
>   	struct {
>   		struct devfreq *devfreq;
>   		struct thermal_cooling_device *cooling;
> +		struct opp_table *opp_table;
>   		ktime_t busy_time;
>   		ktime_t idle_time;
>   		ktime_t time_last_update;
> 

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Steven Price]

On 11/04/2020 21:06, Clément Péron wrote:
> OPP table can defined both frequency and voltage.
> 
> Register the mali regulator if it exist.
> 
> Signed-off-by: Clément Péron <peron.clem@gmail.com>
> ---
>   drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
>   drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
>   2 files changed, 31 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> index 62541f4edd81..2dc8e2355358 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>   	struct device *dev = &pfdev->pdev->dev;
>   	struct devfreq *devfreq;
>   	struct thermal_cooling_device *cooling;
> +	const char *mali = "mali";
> +	struct opp_table *opp_table = NULL;
> +
> +	/* Regulator is optional */
> +	opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);

This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add 
support for multiple regulators") which is currently in drm-misc-next 
(and linux-next). You want something more like:

     opp_table = dev_pm_opp_set_regulators(dev,
                                           pfdev->comp->supply_names,
                                           pfdev->comp->num_supplies);

Otherwise a platform with multiple regulators won't work correctly.

Also running on my firefly (RK3288) board I get the following warning:

    debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already 
present!

This is due to the regulator debugfs entries getting created twice (once 
in panfrost_regulator_init() and once here).

I have been taking a look at doing the same thing (I picked up Martin 
Blumenstingl's patch series[1]), but haven't had much time to focus on 
this recently.

Thanks,

Steve

[1] 
https://lore.kernel.org/dri-devel/20200112001623.2121227-1-martin.blumenstingl@googlemail.com/


> +	if (IS_ERR(opp_table)) {
> +		ret = PTR_ERR(opp_table);
> +		if (ret != -ENODEV) {
> +			DRM_DEV_ERROR(dev, "Failed to set regulator: %d\n", ret);
> +			return ret;
> +		}
> +	}
> +	pfdev->devfreq.opp_table = opp_table;
>   
>   	ret = dev_pm_opp_of_add_table(dev);
> -	if (ret == -ENODEV) /* Optional, continue without devfreq */
> -		return 0;
> -	else if (ret)
> -		return ret;
> +	if (ret) {
> +		if (ret == -ENODEV) /* Optional, continue without devfreq */
> +			ret = 0;
> +		goto err_opp_reg;
> +	}
>   
>   	panfrost_devfreq_reset(pfdev);
>   
> @@ -119,6 +133,12 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>   err_opp:
>   	dev_pm_opp_of_remove_table(dev);
>   
> +err_opp_reg:
> +	if (pfdev->devfreq.opp_table) {
> +		dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> +		pfdev->devfreq.opp_table = NULL;
> +	}
> +
>   	return ret;
>   }
>   
> @@ -126,7 +146,13 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
>   {
>   	if (pfdev->devfreq.cooling)
>   		devfreq_cooling_unregister(pfdev->devfreq.cooling);
> +
>   	dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
> +
> +	if (pfdev->devfreq.opp_table) {
> +		dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> +		pfdev->devfreq.opp_table = NULL;
> +	}
>   }
>   
>   void panfrost_devfreq_resume(struct panfrost_device *pfdev)
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> index 06713811b92c..f6b0c779dfe5 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> @@ -86,6 +86,7 @@ struct panfrost_device {
>   	struct {
>   		struct devfreq *devfreq;
>   		struct thermal_cooling_device *cooling;
> +		struct opp_table *opp_table;
>   		ktime_t busy_time;
>   		ktime_t idle_time;
>   		ktime_t time_last_update;
> 

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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Steven,

On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
>
> On 11/04/2020 21:06, Clément Péron wrote:
> > OPP table can defined both frequency and voltage.
> >
> > Register the mali regulator if it exist.
> >
> > Signed-off-by: Clément Péron <peron.clem@gmail.com>
> > ---
> >   drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
> >   drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
> >   2 files changed, 31 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > index 62541f4edd81..2dc8e2355358 100644
> > --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> >       struct device *dev = &pfdev->pdev->dev;
> >       struct devfreq *devfreq;
> >       struct thermal_cooling_device *cooling;
> > +     const char *mali = "mali";
> > +     struct opp_table *opp_table = NULL;
> > +
> > +     /* Regulator is optional */
> > +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
>
> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
> support for multiple regulators") which is currently in drm-misc-next
> (and linux-next). You want something more like:

Thanks for you review, indeed I didn't see that multiple regulators
support has been added.
Will update in v2.

>
>      opp_table = dev_pm_opp_set_regulators(dev,
>                                            pfdev->comp->supply_names,
>                                            pfdev->comp->num_supplies);
>
> Otherwise a platform with multiple regulators won't work correctly.
>
> Also running on my firefly (RK3288) board I get the following warning:
>
>     debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
> present!
>
> This is due to the regulator debugfs entries getting created twice (once
> in panfrost_regulator_init() and once here).

Is it a warning that should be consider as an error? Look's more an info no?
What should be the correct behavior if a device want to register two
times the same regulator?

Link to original discussion:
https://lore.kernel.org/patchwork/patch/1176717/

Thanks,
Clement

>
> I have been taking a look at doing the same thing (I picked up Martin
> Blumenstingl's patch series[1]), but haven't had much time to focus on
> this recently.
>
> Thanks,
>
> Steve
>
> [1]
> https://lore.kernel.org/dri-devel/20200112001623.2121227-1-martin.blumenstingl@googlemail.com/
>
>
> > +     if (IS_ERR(opp_table)) {
> > +             ret = PTR_ERR(opp_table);
> > +             if (ret != -ENODEV) {
> > +                     DRM_DEV_ERROR(dev, "Failed to set regulator: %d\n", ret);
> > +                     return ret;
> > +             }
> > +     }
> > +     pfdev->devfreq.opp_table = opp_table;
> >
> >       ret = dev_pm_opp_of_add_table(dev);
> > -     if (ret == -ENODEV) /* Optional, continue without devfreq */
> > -             return 0;
> > -     else if (ret)
> > -             return ret;
> > +     if (ret) {
> > +             if (ret == -ENODEV) /* Optional, continue without devfreq */
> > +                     ret = 0;
> > +             goto err_opp_reg;
> > +     }
> >
> >       panfrost_devfreq_reset(pfdev);
> >
> > @@ -119,6 +133,12 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> >   err_opp:
> >       dev_pm_opp_of_remove_table(dev);
> >
> > +err_opp_reg:
> > +     if (pfdev->devfreq.opp_table) {
> > +             dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> > +             pfdev->devfreq.opp_table = NULL;
> > +     }
> > +
> >       return ret;
> >   }
> >
> > @@ -126,7 +146,13 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
> >   {
> >       if (pfdev->devfreq.cooling)
> >               devfreq_cooling_unregister(pfdev->devfreq.cooling);
> > +
> >       dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
> > +
> > +     if (pfdev->devfreq.opp_table) {
> > +             dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> > +             pfdev->devfreq.opp_table = NULL;
> > +     }
> >   }
> >
> >   void panfrost_devfreq_resume(struct panfrost_device *pfdev)
> > diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> > index 06713811b92c..f6b0c779dfe5 100644
> > --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> > +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> > @@ -86,6 +86,7 @@ struct panfrost_device {
> >       struct {
> >               struct devfreq *devfreq;
> >               struct thermal_cooling_device *cooling;
> > +             struct opp_table *opp_table;
> >               ktime_t busy_time;
> >               ktime_t idle_time;
> >               ktime_t time_last_update;
> >
>

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Steven,

On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
>
> On 11/04/2020 21:06, Clément Péron wrote:
> > OPP table can defined both frequency and voltage.
> >
> > Register the mali regulator if it exist.
> >
> > Signed-off-by: Clément Péron <peron.clem@gmail.com>
> > ---
> >   drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
> >   drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
> >   2 files changed, 31 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > index 62541f4edd81..2dc8e2355358 100644
> > --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> >       struct device *dev = &pfdev->pdev->dev;
> >       struct devfreq *devfreq;
> >       struct thermal_cooling_device *cooling;
> > +     const char *mali = "mali";
> > +     struct opp_table *opp_table = NULL;
> > +
> > +     /* Regulator is optional */
> > +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
>
> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
> support for multiple regulators") which is currently in drm-misc-next
> (and linux-next). You want something more like:

Thanks for you review, indeed I didn't see that multiple regulators
support has been added.
Will update in v2.

>
>      opp_table = dev_pm_opp_set_regulators(dev,
>                                            pfdev->comp->supply_names,
>                                            pfdev->comp->num_supplies);
>
> Otherwise a platform with multiple regulators won't work correctly.
>
> Also running on my firefly (RK3288) board I get the following warning:
>
>     debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
> present!
>
> This is due to the regulator debugfs entries getting created twice (once
> in panfrost_regulator_init() and once here).

Is it a warning that should be consider as an error? Look's more an info no?
What should be the correct behavior if a device want to register two
times the same regulator?

Link to original discussion:
https://lore.kernel.org/patchwork/patch/1176717/

Thanks,
Clement

>
> I have been taking a look at doing the same thing (I picked up Martin
> Blumenstingl's patch series[1]), but haven't had much time to focus on
> this recently.
>
> Thanks,
>
> Steve
>
> [1]
> https://lore.kernel.org/dri-devel/20200112001623.2121227-1-martin.blumenstingl@googlemail.com/
>
>
> > +     if (IS_ERR(opp_table)) {
> > +             ret = PTR_ERR(opp_table);
> > +             if (ret != -ENODEV) {
> > +                     DRM_DEV_ERROR(dev, "Failed to set regulator: %d\n", ret);
> > +                     return ret;
> > +             }
> > +     }
> > +     pfdev->devfreq.opp_table = opp_table;
> >
> >       ret = dev_pm_opp_of_add_table(dev);
> > -     if (ret == -ENODEV) /* Optional, continue without devfreq */
> > -             return 0;
> > -     else if (ret)
> > -             return ret;
> > +     if (ret) {
> > +             if (ret == -ENODEV) /* Optional, continue without devfreq */
> > +                     ret = 0;
> > +             goto err_opp_reg;
> > +     }
> >
> >       panfrost_devfreq_reset(pfdev);
> >
> > @@ -119,6 +133,12 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> >   err_opp:
> >       dev_pm_opp_of_remove_table(dev);
> >
> > +err_opp_reg:
> > +     if (pfdev->devfreq.opp_table) {
> > +             dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> > +             pfdev->devfreq.opp_table = NULL;
> > +     }
> > +
> >       return ret;
> >   }
> >
> > @@ -126,7 +146,13 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
> >   {
> >       if (pfdev->devfreq.cooling)
> >               devfreq_cooling_unregister(pfdev->devfreq.cooling);
> > +
> >       dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
> > +
> > +     if (pfdev->devfreq.opp_table) {
> > +             dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> > +             pfdev->devfreq.opp_table = NULL;
> > +     }
> >   }
> >
> >   void panfrost_devfreq_resume(struct panfrost_device *pfdev)
> > diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> > index 06713811b92c..f6b0c779dfe5 100644
> > --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> > +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> > @@ -86,6 +86,7 @@ struct panfrost_device {
> >       struct {
> >               struct devfreq *devfreq;
> >               struct thermal_cooling_device *cooling;
> > +             struct opp_table *opp_table;
> >               ktime_t busy_time;
> >               ktime_t idle_time;
> >               ktime_t time_last_update;
> >
>
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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi,

On Mon, 13 Apr 2020 at 16:18, Clément Péron <peron.clem@gmail.com> wrote:
>
> Hi Steven,
>
> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
> >
> > On 11/04/2020 21:06, Clément Péron wrote:
> > > OPP table can defined both frequency and voltage.
> > >
> > > Register the mali regulator if it exist.
> > >
> > > Signed-off-by: Clément Péron <peron.clem@gmail.com>
> > > ---
> > >   drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
> > >   drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
> > >   2 files changed, 31 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > > index 62541f4edd81..2dc8e2355358 100644
> > > --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > > +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > > @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> > >       struct device *dev = &pfdev->pdev->dev;
> > >       struct devfreq *devfreq;
> > >       struct thermal_cooling_device *cooling;
> > > +     const char *mali = "mali";
> > > +     struct opp_table *opp_table = NULL;
> > > +
> > > +     /* Regulator is optional */
> > > +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
> >
> > This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
> > support for multiple regulators") which is currently in drm-misc-next
> > (and linux-next). You want something more like:
>
> Thanks for you review, indeed I didn't see that multiple regulators
> support has been added.
> Will update in v2.
>
> >
> >      opp_table = dev_pm_opp_set_regulators(dev,
> >                                            pfdev->comp->supply_names,
> >                                            pfdev->comp->num_supplies);
> >
> > Otherwise a platform with multiple regulators won't work correctly.
> >
> > Also running on my firefly (RK3288) board I get the following warning:
> >
> >     debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
> > present!
> >
> > This is due to the regulator debugfs entries getting created twice (once
> > in panfrost_regulator_init() and once here).
>
> Is it a warning that should be consider as an error? Look's more an info no?
> What should be the correct behavior if a device want to register two
> times the same regulator?

Or we can change the name from vdd_XXX to opp_vdd_XXX ?
https://elixir.bootlin.com/linux/latest/source/drivers/opp/debugfs.c#L45

>
> Link to original discussion:
> https://lore.kernel.org/patchwork/patch/1176717/
>
> Thanks,
> Clement
>
> >
> > I have been taking a look at doing the same thing (I picked up Martin
> > Blumenstingl's patch series[1]), but haven't had much time to focus on
> > this recently.
> >
> > Thanks,
> >
> > Steve
> >
> > [1]
> > https://lore.kernel.org/dri-devel/20200112001623.2121227-1-martin.blumenstingl@googlemail.com/
> >
> >
> > > +     if (IS_ERR(opp_table)) {
> > > +             ret = PTR_ERR(opp_table);
> > > +             if (ret != -ENODEV) {
> > > +                     DRM_DEV_ERROR(dev, "Failed to set regulator: %d\n", ret);
> > > +                     return ret;
> > > +             }
> > > +     }
> > > +     pfdev->devfreq.opp_table = opp_table;
> > >
> > >       ret = dev_pm_opp_of_add_table(dev);
> > > -     if (ret == -ENODEV) /* Optional, continue without devfreq */
> > > -             return 0;
> > > -     else if (ret)
> > > -             return ret;
> > > +     if (ret) {
> > > +             if (ret == -ENODEV) /* Optional, continue without devfreq */
> > > +                     ret = 0;
> > > +             goto err_opp_reg;
> > > +     }
> > >
> > >       panfrost_devfreq_reset(pfdev);
> > >
> > > @@ -119,6 +133,12 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> > >   err_opp:
> > >       dev_pm_opp_of_remove_table(dev);
> > >
> > > +err_opp_reg:
> > > +     if (pfdev->devfreq.opp_table) {
> > > +             dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> > > +             pfdev->devfreq.opp_table = NULL;
> > > +     }
> > > +
> > >       return ret;
> > >   }
> > >
> > > @@ -126,7 +146,13 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
> > >   {
> > >       if (pfdev->devfreq.cooling)
> > >               devfreq_cooling_unregister(pfdev->devfreq.cooling);
> > > +
> > >       dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
> > > +
> > > +     if (pfdev->devfreq.opp_table) {
> > > +             dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> > > +             pfdev->devfreq.opp_table = NULL;
> > > +     }
> > >   }
> > >
> > >   void panfrost_devfreq_resume(struct panfrost_device *pfdev)
> > > diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> > > index 06713811b92c..f6b0c779dfe5 100644
> > > --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> > > +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> > > @@ -86,6 +86,7 @@ struct panfrost_device {
> > >       struct {
> > >               struct devfreq *devfreq;
> > >               struct thermal_cooling_device *cooling;
> > > +             struct opp_table *opp_table;
> > >               ktime_t busy_time;
> > >               ktime_t idle_time;
> > >               ktime_t time_last_update;
> > >
> >

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi,

On Mon, 13 Apr 2020 at 16:18, Clément Péron <peron.clem@gmail.com> wrote:
>
> Hi Steven,
>
> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
> >
> > On 11/04/2020 21:06, Clément Péron wrote:
> > > OPP table can defined both frequency and voltage.
> > >
> > > Register the mali regulator if it exist.
> > >
> > > Signed-off-by: Clément Péron <peron.clem@gmail.com>
> > > ---
> > >   drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
> > >   drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
> > >   2 files changed, 31 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > > index 62541f4edd81..2dc8e2355358 100644
> > > --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > > +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > > @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> > >       struct device *dev = &pfdev->pdev->dev;
> > >       struct devfreq *devfreq;
> > >       struct thermal_cooling_device *cooling;
> > > +     const char *mali = "mali";
> > > +     struct opp_table *opp_table = NULL;
> > > +
> > > +     /* Regulator is optional */
> > > +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
> >
> > This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
> > support for multiple regulators") which is currently in drm-misc-next
> > (and linux-next). You want something more like:
>
> Thanks for you review, indeed I didn't see that multiple regulators
> support has been added.
> Will update in v2.
>
> >
> >      opp_table = dev_pm_opp_set_regulators(dev,
> >                                            pfdev->comp->supply_names,
> >                                            pfdev->comp->num_supplies);
> >
> > Otherwise a platform with multiple regulators won't work correctly.
> >
> > Also running on my firefly (RK3288) board I get the following warning:
> >
> >     debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
> > present!
> >
> > This is due to the regulator debugfs entries getting created twice (once
> > in panfrost_regulator_init() and once here).
>
> Is it a warning that should be consider as an error? Look's more an info no?
> What should be the correct behavior if a device want to register two
> times the same regulator?

Or we can change the name from vdd_XXX to opp_vdd_XXX ?
https://elixir.bootlin.com/linux/latest/source/drivers/opp/debugfs.c#L45

>
> Link to original discussion:
> https://lore.kernel.org/patchwork/patch/1176717/
>
> Thanks,
> Clement
>
> >
> > I have been taking a look at doing the same thing (I picked up Martin
> > Blumenstingl's patch series[1]), but haven't had much time to focus on
> > this recently.
> >
> > Thanks,
> >
> > Steve
> >
> > [1]
> > https://lore.kernel.org/dri-devel/20200112001623.2121227-1-martin.blumenstingl@googlemail.com/
> >
> >
> > > +     if (IS_ERR(opp_table)) {
> > > +             ret = PTR_ERR(opp_table);
> > > +             if (ret != -ENODEV) {
> > > +                     DRM_DEV_ERROR(dev, "Failed to set regulator: %d\n", ret);
> > > +                     return ret;
> > > +             }
> > > +     }
> > > +     pfdev->devfreq.opp_table = opp_table;
> > >
> > >       ret = dev_pm_opp_of_add_table(dev);
> > > -     if (ret == -ENODEV) /* Optional, continue without devfreq */
> > > -             return 0;
> > > -     else if (ret)
> > > -             return ret;
> > > +     if (ret) {
> > > +             if (ret == -ENODEV) /* Optional, continue without devfreq */
> > > +                     ret = 0;
> > > +             goto err_opp_reg;
> > > +     }
> > >
> > >       panfrost_devfreq_reset(pfdev);
> > >
> > > @@ -119,6 +133,12 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> > >   err_opp:
> > >       dev_pm_opp_of_remove_table(dev);
> > >
> > > +err_opp_reg:
> > > +     if (pfdev->devfreq.opp_table) {
> > > +             dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> > > +             pfdev->devfreq.opp_table = NULL;
> > > +     }
> > > +
> > >       return ret;
> > >   }
> > >
> > > @@ -126,7 +146,13 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
> > >   {
> > >       if (pfdev->devfreq.cooling)
> > >               devfreq_cooling_unregister(pfdev->devfreq.cooling);
> > > +
> > >       dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
> > > +
> > > +     if (pfdev->devfreq.opp_table) {
> > > +             dev_pm_opp_put_regulators(pfdev->devfreq.opp_table);
> > > +             pfdev->devfreq.opp_table = NULL;
> > > +     }
> > >   }
> > >
> > >   void panfrost_devfreq_resume(struct panfrost_device *pfdev)
> > > diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> > > index 06713811b92c..f6b0c779dfe5 100644
> > > --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> > > +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> > > @@ -86,6 +86,7 @@ struct panfrost_device {
> > >       struct {
> > >               struct devfreq *devfreq;
> > >               struct thermal_cooling_device *cooling;
> > > +             struct opp_table *opp_table;
> > >               ktime_t busy_time;
> > >               ktime_t idle_time;
> > >               ktime_t time_last_update;
> > >
> >
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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Steven Price]

On 13/04/2020 15:31, Clément Péron wrote:
> Hi,
> 
> On Mon, 13 Apr 2020 at 16:18, Clément Péron <peron.clem@gmail.com> wrote:
>>
>> Hi Steven,
>>
>> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
>>>
>>> On 11/04/2020 21:06, Clément Péron wrote:
>>>> OPP table can defined both frequency and voltage.
>>>>
>>>> Register the mali regulator if it exist.
>>>>
>>>> Signed-off-by: Clément Péron <peron.clem@gmail.com>
>>>> ---
>>>>    drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
>>>>    drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
>>>>    2 files changed, 31 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>>> index 62541f4edd81..2dc8e2355358 100644
>>>> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>>> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>>> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>>>>        struct device *dev = &pfdev->pdev->dev;
>>>>        struct devfreq *devfreq;
>>>>        struct thermal_cooling_device *cooling;
>>>> +     const char *mali = "mali";
>>>> +     struct opp_table *opp_table = NULL;
>>>> +
>>>> +     /* Regulator is optional */
>>>> +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
>>>
>>> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
>>> support for multiple regulators") which is currently in drm-misc-next
>>> (and linux-next). You want something more like:
>>
>> Thanks for you review, indeed I didn't see that multiple regulators
>> support has been added.
>> Will update in v2.
>>
>>>
>>>       opp_table = dev_pm_opp_set_regulators(dev,
>>>                                             pfdev->comp->supply_names,
>>>                                             pfdev->comp->num_supplies);
>>>
>>> Otherwise a platform with multiple regulators won't work correctly.
>>>
>>> Also running on my firefly (RK3288) board I get the following warning:
>>>
>>>      debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
>>> present!
>>>
>>> This is due to the regulator debugfs entries getting created twice (once
>>> in panfrost_regulator_init() and once here).
>>
>> Is it a warning that should be consider as an error? Look's more an info no?
>> What should be the correct behavior if a device want to register two
>> times the same regulator?
> 
> Or we can change the name from vdd_XXX to opp_vdd_XXX ?
> https://elixir.bootlin.com/linux/latest/source/drivers/opp/debugfs.c#L45

Yes, I'm not sure that it's actually a problem in practice. And it may 
well be correct to change this in the generic code rather than try to 
work around it in Panfrost. But we shouldn't spam the user with warnings 
as that makes real issues harder to see.

Your suggestion to change the name seems reasonable to me, but I don't 
fully understand the opp code, so we'd need some review from the OPP 
maintainers. Hopefully Viresh, Nishanth or Stephen can provide some insight.

Steve

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Steven Price]

On 13/04/2020 15:31, Clément Péron wrote:
> Hi,
> 
> On Mon, 13 Apr 2020 at 16:18, Clément Péron <peron.clem@gmail.com> wrote:
>>
>> Hi Steven,
>>
>> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
>>>
>>> On 11/04/2020 21:06, Clément Péron wrote:
>>>> OPP table can defined both frequency and voltage.
>>>>
>>>> Register the mali regulator if it exist.
>>>>
>>>> Signed-off-by: Clément Péron <peron.clem@gmail.com>
>>>> ---
>>>>    drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
>>>>    drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
>>>>    2 files changed, 31 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>>> index 62541f4edd81..2dc8e2355358 100644
>>>> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>>> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>>> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>>>>        struct device *dev = &pfdev->pdev->dev;
>>>>        struct devfreq *devfreq;
>>>>        struct thermal_cooling_device *cooling;
>>>> +     const char *mali = "mali";
>>>> +     struct opp_table *opp_table = NULL;
>>>> +
>>>> +     /* Regulator is optional */
>>>> +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
>>>
>>> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
>>> support for multiple regulators") which is currently in drm-misc-next
>>> (and linux-next). You want something more like:
>>
>> Thanks for you review, indeed I didn't see that multiple regulators
>> support has been added.
>> Will update in v2.
>>
>>>
>>>       opp_table = dev_pm_opp_set_regulators(dev,
>>>                                             pfdev->comp->supply_names,
>>>                                             pfdev->comp->num_supplies);
>>>
>>> Otherwise a platform with multiple regulators won't work correctly.
>>>
>>> Also running on my firefly (RK3288) board I get the following warning:
>>>
>>>      debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
>>> present!
>>>
>>> This is due to the regulator debugfs entries getting created twice (once
>>> in panfrost_regulator_init() and once here).
>>
>> Is it a warning that should be consider as an error? Look's more an info no?
>> What should be the correct behavior if a device want to register two
>> times the same regulator?
> 
> Or we can change the name from vdd_XXX to opp_vdd_XXX ?
> https://elixir.bootlin.com/linux/latest/source/drivers/opp/debugfs.c#L45

Yes, I'm not sure that it's actually a problem in practice. And it may 
well be correct to change this in the generic code rather than try to 
work around it in Panfrost. But we shouldn't spam the user with warnings 
as that makes real issues harder to see.

Your suggestion to change the name seems reasonable to me, but I don't 
fully understand the opp code, so we'd need some review from the OPP 
maintainers. Hopefully Viresh, Nishanth or Stephen can provide some insight.

Steve
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dri-devel mailing list
dri-devel@lists.freedesktop.org
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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Steven,

On Mon, 13 Apr 2020 at 17:55, Steven Price <steven.price@arm.com> wrote:
>
> On 13/04/2020 15:31, Clément Péron wrote:
> > Hi,
> >
> > On Mon, 13 Apr 2020 at 16:18, Clément Péron <peron.clem@gmail.com> wrote:
> >>
> >> Hi Steven,
> >>
> >> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
> >>>
> >>> On 11/04/2020 21:06, Clément Péron wrote:
> >>>> OPP table can defined both frequency and voltage.
> >>>>
> >>>> Register the mali regulator if it exist.
> >>>>
> >>>> Signed-off-by: Clément Péron <peron.clem@gmail.com>
> >>>> ---
> >>>>    drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
> >>>>    drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
> >>>>    2 files changed, 31 insertions(+), 4 deletions(-)
> >>>>
> >>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> >>>> index 62541f4edd81..2dc8e2355358 100644
> >>>> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> >>>> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> >>>> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> >>>>        struct device *dev = &pfdev->pdev->dev;
> >>>>        struct devfreq *devfreq;
> >>>>        struct thermal_cooling_device *cooling;
> >>>> +     const char *mali = "mali";
> >>>> +     struct opp_table *opp_table = NULL;
> >>>> +
> >>>> +     /* Regulator is optional */
> >>>> +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
> >>>
> >>> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
> >>> support for multiple regulators") which is currently in drm-misc-next
> >>> (and linux-next). You want something more like:
> >>
> >> Thanks for you review, indeed I didn't see that multiple regulators
> >> support has been added.
> >> Will update in v2.
> >>
> >>>
> >>>       opp_table = dev_pm_opp_set_regulators(dev,
> >>>                                             pfdev->comp->supply_names,
> >>>                                             pfdev->comp->num_supplies);
> >>>
> >>> Otherwise a platform with multiple regulators won't work correctly.
> >>>
> >>> Also running on my firefly (RK3288) board I get the following warning:
> >>>
> >>>      debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
> >>> present!
> >>>
> >>> This is due to the regulator debugfs entries getting created twice (once
> >>> in panfrost_regulator_init() and once here).
> >>
> >> Is it a warning that should be consider as an error? Look's more an info no?
> >> What should be the correct behavior if a device want to register two
> >> times the same regulator?
> >
> > Or we can change the name from vdd_XXX to opp_vdd_XXX ?
> > https://elixir.bootlin.com/linux/latest/source/drivers/opp/debugfs.c#L45
>
> Yes, I'm not sure that it's actually a problem in practice. And it may
> well be correct to change this in the generic code rather than try to
> work around it in Panfrost. But we shouldn't spam the user with warnings
> as that makes real issues harder to see.
>
> Your suggestion to change the name seems reasonable to me, but I don't
> fully understand the opp code, so we'd need some review from the OPP
> maintainers. Hopefully Viresh, Nishanth or Stephen can provide some insight.

Agree, I will send a v2 with the rename and see if OPP Maintainers agree.

Regards,
Clement

>
> Steve

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Steven,

On Mon, 13 Apr 2020 at 17:55, Steven Price <steven.price@arm.com> wrote:
>
> On 13/04/2020 15:31, Clément Péron wrote:
> > Hi,
> >
> > On Mon, 13 Apr 2020 at 16:18, Clément Péron <peron.clem@gmail.com> wrote:
> >>
> >> Hi Steven,
> >>
> >> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
> >>>
> >>> On 11/04/2020 21:06, Clément Péron wrote:
> >>>> OPP table can defined both frequency and voltage.
> >>>>
> >>>> Register the mali regulator if it exist.
> >>>>
> >>>> Signed-off-by: Clément Péron <peron.clem@gmail.com>
> >>>> ---
> >>>>    drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
> >>>>    drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
> >>>>    2 files changed, 31 insertions(+), 4 deletions(-)
> >>>>
> >>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> >>>> index 62541f4edd81..2dc8e2355358 100644
> >>>> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> >>>> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> >>>> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> >>>>        struct device *dev = &pfdev->pdev->dev;
> >>>>        struct devfreq *devfreq;
> >>>>        struct thermal_cooling_device *cooling;
> >>>> +     const char *mali = "mali";
> >>>> +     struct opp_table *opp_table = NULL;
> >>>> +
> >>>> +     /* Regulator is optional */
> >>>> +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
> >>>
> >>> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
> >>> support for multiple regulators") which is currently in drm-misc-next
> >>> (and linux-next). You want something more like:
> >>
> >> Thanks for you review, indeed I didn't see that multiple regulators
> >> support has been added.
> >> Will update in v2.
> >>
> >>>
> >>>       opp_table = dev_pm_opp_set_regulators(dev,
> >>>                                             pfdev->comp->supply_names,
> >>>                                             pfdev->comp->num_supplies);
> >>>
> >>> Otherwise a platform with multiple regulators won't work correctly.
> >>>
> >>> Also running on my firefly (RK3288) board I get the following warning:
> >>>
> >>>      debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
> >>> present!
> >>>
> >>> This is due to the regulator debugfs entries getting created twice (once
> >>> in panfrost_regulator_init() and once here).
> >>
> >> Is it a warning that should be consider as an error? Look's more an info no?
> >> What should be the correct behavior if a device want to register two
> >> times the same regulator?
> >
> > Or we can change the name from vdd_XXX to opp_vdd_XXX ?
> > https://elixir.bootlin.com/linux/latest/source/drivers/opp/debugfs.c#L45
>
> Yes, I'm not sure that it's actually a problem in practice. And it may
> well be correct to change this in the generic code rather than try to
> work around it in Panfrost. But we shouldn't spam the user with warnings
> as that makes real issues harder to see.
>
> Your suggestion to change the name seems reasonable to me, but I don't
> fully understand the opp code, so we'd need some review from the OPP
> maintainers. Hopefully Viresh, Nishanth or Stephen can provide some insight.

Agree, I will send a v2 with the rename and see if OPP Maintainers agree.

Regards,
Clement

>
> Steve
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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Steven,

On Mon, 13 Apr 2020 at 18:35, Clément Péron <peron.clem@gmail.com> wrote:
>
> Hi Steven,
>
> On Mon, 13 Apr 2020 at 17:55, Steven Price <steven.price@arm.com> wrote:
> >
> > On 13/04/2020 15:31, Clément Péron wrote:
> > > Hi,
> > >
> > > On Mon, 13 Apr 2020 at 16:18, Clément Péron <peron.clem@gmail.com> wrote:
> > >>
> > >> Hi Steven,
> > >>
> > >> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
> > >>>
> > >>> On 11/04/2020 21:06, Clément Péron wrote:
> > >>>> OPP table can defined both frequency and voltage.
> > >>>>
> > >>>> Register the mali regulator if it exist.
> > >>>>
> > >>>> Signed-off-by: Clément Péron <peron.clem@gmail.com>
> > >>>> ---
> > >>>>    drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
> > >>>>    drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
> > >>>>    2 files changed, 31 insertions(+), 4 deletions(-)
> > >>>>
> > >>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > >>>> index 62541f4edd81..2dc8e2355358 100644
> > >>>> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > >>>> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > >>>> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> > >>>>        struct device *dev = &pfdev->pdev->dev;
> > >>>>        struct devfreq *devfreq;
> > >>>>        struct thermal_cooling_device *cooling;
> > >>>> +     const char *mali = "mali";
> > >>>> +     struct opp_table *opp_table = NULL;
> > >>>> +
> > >>>> +     /* Regulator is optional */
> > >>>> +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
> > >>>
> > >>> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
> > >>> support for multiple regulators") which is currently in drm-misc-next
> > >>> (and linux-next). You want something more like:
> > >>
> > >> Thanks for you review, indeed I didn't see that multiple regulators
> > >> support has been added.
> > >> Will update in v2.
> > >>
> > >>>
> > >>>       opp_table = dev_pm_opp_set_regulators(dev,
> > >>>                                             pfdev->comp->supply_names,
> > >>>                                             pfdev->comp->num_supplies);
> > >>>
> > >>> Otherwise a platform with multiple regulators won't work correctly.
> > >>>
> > >>> Also running on my firefly (RK3288) board I get the following warning:
> > >>>
> > >>>      debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
> > >>> present!

I try to reproduce but it can't
regulator is mount at :
./regulator/vdd-gpu
whereas OPP is mount :
./opp/soc-1800000.gpu/opp:756000000/supply-0/

I see that firefly as 2 regulators with the same name :
vdd_gpu from syr828
(https://github.com/mopplayer/Firefly-RK3288-Kernel-With-Mali764/blob/master/arch/arm/boot/dts/firefly-rk3288.dts#L453)
vdd_gpu from rk808_dcdc2_reg
(https://github.com/mopplayer/Firefly-RK3288-Kernel-With-Mali764/blob/master/arch/arm/boot/dts/firefly-rk3288.dts#L841)

So i think the issue is from the firefly device-tree.

Regards,
Clement

> > >>>
> > >>> This is due to the regulator debugfs entries getting created twice (once
> > >>> in panfrost_regulator_init() and once here).
> > >>
> > >> Is it a warning that should be consider as an error? Look's more an info no?
> > >> What should be the correct behavior if a device want to register two
> > >> times the same regulator?
> > >
> > > Or we can change the name from vdd_XXX to opp_vdd_XXX ?
> > > https://elixir.bootlin.com/linux/latest/source/drivers/opp/debugfs.c#L45
> >
> > Yes, I'm not sure that it's actually a problem in practice. And it may
> > well be correct to change this in the generic code rather than try to
> > work around it in Panfrost. But we shouldn't spam the user with warnings
> > as that makes real issues harder to see.
> >
> > Your suggestion to change the name seems reasonable to me, but I don't
> > fully understand the opp code, so we'd need some review from the OPP
> > maintainers. Hopefully Viresh, Nishanth or Stephen can provide some insight.
>
> Agree, I will send a v2 with the rename and see if OPP Maintainers agree.
>
> Regards,
> Clement
>
> >
> > Steve

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Steven,

On Mon, 13 Apr 2020 at 18:35, Clément Péron <peron.clem@gmail.com> wrote:
>
> Hi Steven,
>
> On Mon, 13 Apr 2020 at 17:55, Steven Price <steven.price@arm.com> wrote:
> >
> > On 13/04/2020 15:31, Clément Péron wrote:
> > > Hi,
> > >
> > > On Mon, 13 Apr 2020 at 16:18, Clément Péron <peron.clem@gmail.com> wrote:
> > >>
> > >> Hi Steven,
> > >>
> > >> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
> > >>>
> > >>> On 11/04/2020 21:06, Clément Péron wrote:
> > >>>> OPP table can defined both frequency and voltage.
> > >>>>
> > >>>> Register the mali regulator if it exist.
> > >>>>
> > >>>> Signed-off-by: Clément Péron <peron.clem@gmail.com>
> > >>>> ---
> > >>>>    drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
> > >>>>    drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
> > >>>>    2 files changed, 31 insertions(+), 4 deletions(-)
> > >>>>
> > >>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > >>>> index 62541f4edd81..2dc8e2355358 100644
> > >>>> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > >>>> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > >>>> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> > >>>>        struct device *dev = &pfdev->pdev->dev;
> > >>>>        struct devfreq *devfreq;
> > >>>>        struct thermal_cooling_device *cooling;
> > >>>> +     const char *mali = "mali";
> > >>>> +     struct opp_table *opp_table = NULL;
> > >>>> +
> > >>>> +     /* Regulator is optional */
> > >>>> +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
> > >>>
> > >>> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
> > >>> support for multiple regulators") which is currently in drm-misc-next
> > >>> (and linux-next). You want something more like:
> > >>
> > >> Thanks for you review, indeed I didn't see that multiple regulators
> > >> support has been added.
> > >> Will update in v2.
> > >>
> > >>>
> > >>>       opp_table = dev_pm_opp_set_regulators(dev,
> > >>>                                             pfdev->comp->supply_names,
> > >>>                                             pfdev->comp->num_supplies);
> > >>>
> > >>> Otherwise a platform with multiple regulators won't work correctly.
> > >>>
> > >>> Also running on my firefly (RK3288) board I get the following warning:
> > >>>
> > >>>      debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
> > >>> present!

I try to reproduce but it can't
regulator is mount at :
./regulator/vdd-gpu
whereas OPP is mount :
./opp/soc-1800000.gpu/opp:756000000/supply-0/

I see that firefly as 2 regulators with the same name :
vdd_gpu from syr828
(https://github.com/mopplayer/Firefly-RK3288-Kernel-With-Mali764/blob/master/arch/arm/boot/dts/firefly-rk3288.dts#L453)
vdd_gpu from rk808_dcdc2_reg
(https://github.com/mopplayer/Firefly-RK3288-Kernel-With-Mali764/blob/master/arch/arm/boot/dts/firefly-rk3288.dts#L841)

So i think the issue is from the firefly device-tree.

Regards,
Clement

> > >>>
> > >>> This is due to the regulator debugfs entries getting created twice (once
> > >>> in panfrost_regulator_init() and once here).
> > >>
> > >> Is it a warning that should be consider as an error? Look's more an info no?
> > >> What should be the correct behavior if a device want to register two
> > >> times the same regulator?
> > >
> > > Or we can change the name from vdd_XXX to opp_vdd_XXX ?
> > > https://elixir.bootlin.com/linux/latest/source/drivers/opp/debugfs.c#L45
> >
> > Yes, I'm not sure that it's actually a problem in practice. And it may
> > well be correct to change this in the generic code rather than try to
> > work around it in Panfrost. But we shouldn't spam the user with warnings
> > as that makes real issues harder to see.
> >
> > Your suggestion to change the name seems reasonable to me, but I don't
> > fully understand the opp code, so we'd need some review from the OPP
> > maintainers. Hopefully Viresh, Nishanth or Stephen can provide some insight.
>
> Agree, I will send a v2 with the rename and see if OPP Maintainers agree.
>
> Regards,
> Clement
>
> >
> > Steve
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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Robin Murphy]

On 2020-04-13 3:18 pm, Clément Péron wrote:
> Hi Steven,
> 
> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
>>
>> On 11/04/2020 21:06, Clément Péron wrote:
>>> OPP table can defined both frequency and voltage.
>>>
>>> Register the mali regulator if it exist.
>>>
>>> Signed-off-by: Clément Péron <peron.clem@gmail.com>
>>> ---
>>>    drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
>>>    drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
>>>    2 files changed, 31 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>> index 62541f4edd81..2dc8e2355358 100644
>>> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>>>        struct device *dev = &pfdev->pdev->dev;
>>>        struct devfreq *devfreq;
>>>        struct thermal_cooling_device *cooling;
>>> +     const char *mali = "mali";
>>> +     struct opp_table *opp_table = NULL;
>>> +
>>> +     /* Regulator is optional */
>>> +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
>>
>> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
>> support for multiple regulators") which is currently in drm-misc-next
>> (and linux-next). You want something more like:
> 
> Thanks for you review, indeed I didn't see that multiple regulators
> support has been added.
> Will update in v2.

Although note that we probably also want a version that can be 
backported to stable without that dependency, since this behaviour is 
arguably a regression since 221bc77914cb ("drm/panfrost: Use generic 
code for devfreq"), and does appear to have been causing subtle problems 
for users.

Robin.

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Robin Murphy]

On 2020-04-13 3:18 pm, Clément Péron wrote:
> Hi Steven,
> 
> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
>>
>> On 11/04/2020 21:06, Clément Péron wrote:
>>> OPP table can defined both frequency and voltage.
>>>
>>> Register the mali regulator if it exist.
>>>
>>> Signed-off-by: Clément Péron <peron.clem@gmail.com>
>>> ---
>>>    drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
>>>    drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
>>>    2 files changed, 31 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>> index 62541f4edd81..2dc8e2355358 100644
>>> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>>>        struct device *dev = &pfdev->pdev->dev;
>>>        struct devfreq *devfreq;
>>>        struct thermal_cooling_device *cooling;
>>> +     const char *mali = "mali";
>>> +     struct opp_table *opp_table = NULL;
>>> +
>>> +     /* Regulator is optional */
>>> +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
>>
>> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
>> support for multiple regulators") which is currently in drm-misc-next
>> (and linux-next). You want something more like:
> 
> Thanks for you review, indeed I didn't see that multiple regulators
> support has been added.
> Will update in v2.

Although note that we probably also want a version that can be 
backported to stable without that dependency, since this behaviour is 
arguably a regression since 221bc77914cb ("drm/panfrost: Use generic 
code for devfreq"), and does appear to have been causing subtle problems 
for users.

Robin.
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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Steven Price]

Hi Clément,

On 13/04/2020 18:28, Clément Péron wrote:
> Hi Steven,
> 
> On Mon, 13 Apr 2020 at 18:35, Clément Péron <peron.clem@gmail.com> wrote:
>>
>> Hi Steven,
>>
>> On Mon, 13 Apr 2020 at 17:55, Steven Price <steven.price@arm.com> wrote:
>>>
>>> On 13/04/2020 15:31, Clément Péron wrote:
>>>> Hi,
>>>>
>>>> On Mon, 13 Apr 2020 at 16:18, Clément Péron <peron.clem@gmail.com> wrote:
>>>>>
>>>>> Hi Steven,
>>>>>
>>>>> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
>>>>>>
>>>>>> On 11/04/2020 21:06, Clément Péron wrote:
>>>>>>> OPP table can defined both frequency and voltage.
>>>>>>>
>>>>>>> Register the mali regulator if it exist.
>>>>>>>
>>>>>>> Signed-off-by: Clément Péron <peron.clem@gmail.com>
>>>>>>> ---
>>>>>>>     drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
>>>>>>>     drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
>>>>>>>     2 files changed, 31 insertions(+), 4 deletions(-)
>>>>>>>
>>>>>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>>>>>> index 62541f4edd81..2dc8e2355358 100644
>>>>>>> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>>>>>> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>>>>>> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>>>>>>>         struct device *dev = &pfdev->pdev->dev;
>>>>>>>         struct devfreq *devfreq;
>>>>>>>         struct thermal_cooling_device *cooling;
>>>>>>> +     const char *mali = "mali";
>>>>>>> +     struct opp_table *opp_table = NULL;
>>>>>>> +
>>>>>>> +     /* Regulator is optional */
>>>>>>> +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
>>>>>>
>>>>>> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
>>>>>> support for multiple regulators") which is currently in drm-misc-next
>>>>>> (and linux-next). You want something more like:
>>>>>
>>>>> Thanks for you review, indeed I didn't see that multiple regulators
>>>>> support has been added.
>>>>> Will update in v2.
>>>>>
>>>>>>
>>>>>>        opp_table = dev_pm_opp_set_regulators(dev,
>>>>>>                                              pfdev->comp->supply_names,
>>>>>>                                              pfdev->comp->num_supplies);
>>>>>>
>>>>>> Otherwise a platform with multiple regulators won't work correctly.
>>>>>>
>>>>>> Also running on my firefly (RK3288) board I get the following warning:
>>>>>>
>>>>>>       debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
>>>>>> present!
> 
> I try to reproduce but it can't
> regulator is mount at :
> ./regulator/vdd-gpu
> whereas OPP is mount :
> ./opp/soc-1800000.gpu/opp:756000000/supply-0/

Getting a backtrace from the two occurrences, I see one added from:

   (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
   (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
   (_regulator_get) from [<c04682e0>] (regulator_bulk_get+0x64/0xf4)
   (regulator_bulk_get) from [<c04696f0>] 
(devm_regulator_bulk_get+0x40/0x74)
   (devm_regulator_bulk_get) from [<bf00af44>] 
(panfrost_device_init+0x1b4/0x48c [panfrost])
   (panfrost_device_init [panfrost]) from [<bf00a4d4>] 
(panfrost_probe+0x94/0x184 [panfrost])
   (panfrost_probe [panfrost]) from [<c04ee694>] 
(platform_drv_probe+0x48/0x94)

And the other:

   (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
   (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
   (_regulator_get) from [<c05c1280>] (dev_pm_opp_set_regulators+0x6c/0x184)
   (dev_pm_opp_set_regulators) from [<bf00b4ac>] 
(panfrost_devfreq_init+0x38/0x1ac [panfrost])
   (panfrost_devfreq_init [panfrost]) from [<bf00a508>] 
(panfrost_probe+0xc8/0x184 [panfrost])
   (panfrost_probe [panfrost]) from [<c04ee694>] 
(platform_drv_probe+0x48/0x94)

Both are created at /regulator/vdd_gpu

> 
> I see that firefly as 2 regulators with the same name :
> vdd_gpu from syr828
> (https://github.com/mopplayer/Firefly-RK3288-Kernel-With-Mali764/blob/master/arch/arm/boot/dts/firefly-rk3288.dts#L453)
> vdd_gpu from rk808_dcdc2_reg
> (https://github.com/mopplayer/Firefly-RK3288-Kernel-With-Mali764/blob/master/arch/arm/boot/dts/firefly-rk3288.dts#L841)
> 
> So i think the issue is from the firefly device-tree.

I'm using the DTB from the kernel tree 
(/arch/arm/boot/dts/rk3288-firefly.dts) which as far as I can see 
doesn't contain this problem. Certainly decompiling the DTB I can see 
only one mention of vdd_gpu (in syr828).

Steve

> 
> Regards,
> Clement
> 
>>>>>>
>>>>>> This is due to the regulator debugfs entries getting created twice (once
>>>>>> in panfrost_regulator_init() and once here).
>>>>>
>>>>> Is it a warning that should be consider as an error? Look's more an info no?
>>>>> What should be the correct behavior if a device want to register two
>>>>> times the same regulator?
>>>>
>>>> Or we can change the name from vdd_XXX to opp_vdd_XXX ?
>>>> https://elixir.bootlin.com/linux/latest/source/drivers/opp/debugfs.c#L45
>>>
>>> Yes, I'm not sure that it's actually a problem in practice. And it may
>>> well be correct to change this in the generic code rather than try to
>>> work around it in Panfrost. But we shouldn't spam the user with warnings
>>> as that makes real issues harder to see.
>>>
>>> Your suggestion to change the name seems reasonable to me, but I don't
>>> fully understand the opp code, so we'd need some review from the OPP
>>> maintainers. Hopefully Viresh, Nishanth or Stephen can provide some insight.
>>
>> Agree, I will send a v2 with the rename and see if OPP Maintainers agree.
>>
>> Regards,
>> Clement
>>
>>>
>>> Steve

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Steven Price]

Hi Clément,

On 13/04/2020 18:28, Clément Péron wrote:
> Hi Steven,
> 
> On Mon, 13 Apr 2020 at 18:35, Clément Péron <peron.clem@gmail.com> wrote:
>>
>> Hi Steven,
>>
>> On Mon, 13 Apr 2020 at 17:55, Steven Price <steven.price@arm.com> wrote:
>>>
>>> On 13/04/2020 15:31, Clément Péron wrote:
>>>> Hi,
>>>>
>>>> On Mon, 13 Apr 2020 at 16:18, Clément Péron <peron.clem@gmail.com> wrote:
>>>>>
>>>>> Hi Steven,
>>>>>
>>>>> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
>>>>>>
>>>>>> On 11/04/2020 21:06, Clément Péron wrote:
>>>>>>> OPP table can defined both frequency and voltage.
>>>>>>>
>>>>>>> Register the mali regulator if it exist.
>>>>>>>
>>>>>>> Signed-off-by: Clément Péron <peron.clem@gmail.com>
>>>>>>> ---
>>>>>>>     drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
>>>>>>>     drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
>>>>>>>     2 files changed, 31 insertions(+), 4 deletions(-)
>>>>>>>
>>>>>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>>>>>> index 62541f4edd81..2dc8e2355358 100644
>>>>>>> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>>>>>> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>>>>>> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>>>>>>>         struct device *dev = &pfdev->pdev->dev;
>>>>>>>         struct devfreq *devfreq;
>>>>>>>         struct thermal_cooling_device *cooling;
>>>>>>> +     const char *mali = "mali";
>>>>>>> +     struct opp_table *opp_table = NULL;
>>>>>>> +
>>>>>>> +     /* Regulator is optional */
>>>>>>> +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
>>>>>>
>>>>>> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
>>>>>> support for multiple regulators") which is currently in drm-misc-next
>>>>>> (and linux-next). You want something more like:
>>>>>
>>>>> Thanks for you review, indeed I didn't see that multiple regulators
>>>>> support has been added.
>>>>> Will update in v2.
>>>>>
>>>>>>
>>>>>>        opp_table = dev_pm_opp_set_regulators(dev,
>>>>>>                                              pfdev->comp->supply_names,
>>>>>>                                              pfdev->comp->num_supplies);
>>>>>>
>>>>>> Otherwise a platform with multiple regulators won't work correctly.
>>>>>>
>>>>>> Also running on my firefly (RK3288) board I get the following warning:
>>>>>>
>>>>>>       debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
>>>>>> present!
> 
> I try to reproduce but it can't
> regulator is mount at :
> ./regulator/vdd-gpu
> whereas OPP is mount :
> ./opp/soc-1800000.gpu/opp:756000000/supply-0/

Getting a backtrace from the two occurrences, I see one added from:

   (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
   (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
   (_regulator_get) from [<c04682e0>] (regulator_bulk_get+0x64/0xf4)
   (regulator_bulk_get) from [<c04696f0>] 
(devm_regulator_bulk_get+0x40/0x74)
   (devm_regulator_bulk_get) from [<bf00af44>] 
(panfrost_device_init+0x1b4/0x48c [panfrost])
   (panfrost_device_init [panfrost]) from [<bf00a4d4>] 
(panfrost_probe+0x94/0x184 [panfrost])
   (panfrost_probe [panfrost]) from [<c04ee694>] 
(platform_drv_probe+0x48/0x94)

And the other:

   (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
   (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
   (_regulator_get) from [<c05c1280>] (dev_pm_opp_set_regulators+0x6c/0x184)
   (dev_pm_opp_set_regulators) from [<bf00b4ac>] 
(panfrost_devfreq_init+0x38/0x1ac [panfrost])
   (panfrost_devfreq_init [panfrost]) from [<bf00a508>] 
(panfrost_probe+0xc8/0x184 [panfrost])
   (panfrost_probe [panfrost]) from [<c04ee694>] 
(platform_drv_probe+0x48/0x94)

Both are created at /regulator/vdd_gpu

> 
> I see that firefly as 2 regulators with the same name :
> vdd_gpu from syr828
> (https://github.com/mopplayer/Firefly-RK3288-Kernel-With-Mali764/blob/master/arch/arm/boot/dts/firefly-rk3288.dts#L453)
> vdd_gpu from rk808_dcdc2_reg
> (https://github.com/mopplayer/Firefly-RK3288-Kernel-With-Mali764/blob/master/arch/arm/boot/dts/firefly-rk3288.dts#L841)
> 
> So i think the issue is from the firefly device-tree.

I'm using the DTB from the kernel tree 
(/arch/arm/boot/dts/rk3288-firefly.dts) which as far as I can see 
doesn't contain this problem. Certainly decompiling the DTB I can see 
only one mention of vdd_gpu (in syr828).

Steve

> 
> Regards,
> Clement
> 
>>>>>>
>>>>>> This is due to the regulator debugfs entries getting created twice (once
>>>>>> in panfrost_regulator_init() and once here).
>>>>>
>>>>> Is it a warning that should be consider as an error? Look's more an info no?
>>>>> What should be the correct behavior if a device want to register two
>>>>> times the same regulator?
>>>>
>>>> Or we can change the name from vdd_XXX to opp_vdd_XXX ?
>>>> https://elixir.bootlin.com/linux/latest/source/drivers/opp/debugfs.c#L45
>>>
>>> Yes, I'm not sure that it's actually a problem in practice. And it may
>>> well be correct to change this in the generic code rather than try to
>>> work around it in Panfrost. But we shouldn't spam the user with warnings
>>> as that makes real issues harder to see.
>>>
>>> Your suggestion to change the name seems reasonable to me, but I don't
>>> fully understand the opp code, so we'd need some review from the OPP
>>> maintainers. Hopefully Viresh, Nishanth or Stephen can provide some insight.
>>
>> Agree, I will send a v2 with the rename and see if OPP Maintainers agree.
>>
>> Regards,
>> Clement
>>
>>>
>>> Steve

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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Liam and Mark,

On Tue, 14 Apr 2020 at 15:10, Steven Price <steven.price@arm.com> wrote:
>
> Hi Clément,
>
> On 13/04/2020 18:28, Clément Péron wrote:
> > Hi Steven,
> >
> > On Mon, 13 Apr 2020 at 18:35, Clément Péron <peron.clem@gmail.com> wrote:
> >>
> >> Hi Steven,
> >>
> >> On Mon, 13 Apr 2020 at 17:55, Steven Price <steven.price@arm.com> wrote:
> >>>
> >>> On 13/04/2020 15:31, Clément Péron wrote:
> >>>> Hi,
> >>>>
> >>>> On Mon, 13 Apr 2020 at 16:18, Clément Péron <peron.clem@gmail.com> wrote:
> >>>>>
> >>>>> Hi Steven,
> >>>>>
> >>>>> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
> >>>>>>
> >>>>>> On 11/04/2020 21:06, Clément Péron wrote:
> >>>>>>> OPP table can defined both frequency and voltage.
> >>>>>>>
> >>>>>>> Register the mali regulator if it exist.
> >>>>>>>
> >>>>>>> Signed-off-by: Clément Péron <peron.clem@gmail.com>
> >>>>>>> ---
> >>>>>>>     drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
> >>>>>>>     drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
> >>>>>>>     2 files changed, 31 insertions(+), 4 deletions(-)
> >>>>>>>
> >>>>>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> >>>>>>> index 62541f4edd81..2dc8e2355358 100644
> >>>>>>> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> >>>>>>> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> >>>>>>> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> >>>>>>>         struct device *dev = &pfdev->pdev->dev;
> >>>>>>>         struct devfreq *devfreq;
> >>>>>>>         struct thermal_cooling_device *cooling;
> >>>>>>> +     const char *mali = "mali";
> >>>>>>> +     struct opp_table *opp_table = NULL;
> >>>>>>> +
> >>>>>>> +     /* Regulator is optional */
> >>>>>>> +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
> >>>>>>
> >>>>>> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
> >>>>>> support for multiple regulators") which is currently in drm-misc-next
> >>>>>> (and linux-next). You want something more like:
> >>>>>
> >>>>> Thanks for you review, indeed I didn't see that multiple regulators
> >>>>> support has been added.
> >>>>> Will update in v2.
> >>>>>
> >>>>>>
> >>>>>>        opp_table = dev_pm_opp_set_regulators(dev,
> >>>>>>                                              pfdev->comp->supply_names,
> >>>>>>                                              pfdev->comp->num_supplies);
> >>>>>>
> >>>>>> Otherwise a platform with multiple regulators won't work correctly.
> >>>>>>
> >>>>>> Also running on my firefly (RK3288) board I get the following warning:
> >>>>>>
> >>>>>>       debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
> >>>>>> present!
> >
> > I try to reproduce but it can't

Sorry, you're right I have indeed the same issue:
[    2.903406] panfrost 1800000.gpu: Features: L2:0x07110206
Shader:0x00000000 Tiler:0x00000809 Mem:0x1 MMU:0x00002821 AS:0xf
JS:0x7
[    2.913297] sunxi-ir 7040000.ir: initialized sunXi IR driver
[    2.919901] panfrost 1800000.gpu: shader_present=0x3 l2_present=0x1
[    2.920497] panfrost 1800000.gpu: Looking up mali-supply from device tree
[    3.036568] vdd-gpu: could not add device link 1800000.gpu err -17
[    3.036580] debugfs: Directory '1800000.gpu-mali' with parent
'vdd-gpu' already present!
[    3.046312] panfrost 1800000.gpu: [drm:panfrost_devfreq_init
[panfrost]] Failed to register cooling device
[    3.056322] [drm] Initialized panfrost 1.1.0 20180908 for
1800000.gpu on minor 0

> > regulator is mount at :
> > ./regulator/vdd-gpu
> > whereas OPP is mount :
> > ./opp/soc-1800000.gpu/opp:756000000/supply-0/
>
> Getting a backtrace from the two occurrences, I see one added from:
>
>    (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
>    (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
>    (_regulator_get) from [<c04682e0>] (regulator_bulk_get+0x64/0xf4)
>    (regulator_bulk_get) from [<c04696f0>]
> (devm_regulator_bulk_get+0x40/0x74)
>    (devm_regulator_bulk_get) from [<bf00af44>]
> (panfrost_device_init+0x1b4/0x48c [panfrost])
>    (panfrost_device_init [panfrost]) from [<bf00a4d4>]
> (panfrost_probe+0x94/0x184 [panfrost])
>    (panfrost_probe [panfrost]) from [<c04ee694>]
> (platform_drv_probe+0x48/0x94)
>
> And the other:
>
>    (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
>    (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
>    (_regulator_get) from [<c05c1280>] (dev_pm_opp_set_regulators+0x6c/0x184)
>    (dev_pm_opp_set_regulators) from [<bf00b4ac>]
> (panfrost_devfreq_init+0x38/0x1ac [panfrost])
>    (panfrost_devfreq_init [panfrost]) from [<bf00a508>]
> (panfrost_probe+0xc8/0x184 [panfrost])
>    (panfrost_probe [panfrost]) from [<c04ee694>]
> (platform_drv_probe+0x48/0x94)
>
> Both are created at /regulator/vdd_gpu

We are having an issue with Panfrost driver registering two times the
same regulator and giving an error when trying to create the debugfs
folder.

Could you clarify if it is allowed for a device to register two times
the same regulator?

I check Documentation/power/regulator/regulator.rst but this point is
not specified.

Thanks,
Clement

>
> >
> > I see that firefly as 2 regulators with the same name :
> > vdd_gpu from syr828
> > (https://github.com/mopplayer/Firefly-RK3288-Kernel-With-Mali764/blob/master/arch/arm/boot/dts/firefly-rk3288.dts#L453)
> > vdd_gpu from rk808_dcdc2_reg
> > (https://github.com/mopplayer/Firefly-RK3288-Kernel-With-Mali764/blob/master/arch/arm/boot/dts/firefly-rk3288.dts#L841)
> >
> > So i think the issue is from the firefly device-tree.
>
> I'm using the DTB from the kernel tree
> (/arch/arm/boot/dts/rk3288-firefly.dts) which as far as I can see
> doesn't contain this problem. Certainly decompiling the DTB I can see
> only one mention of vdd_gpu (in syr828).
>
> Steve
>
> >
> > Regards,
> > Clement
> >
> >>>>>>
> >>>>>> This is due to the regulator debugfs entries getting created twice (once
> >>>>>> in panfrost_regulator_init() and once here).
> >>>>>
> >>>>> Is it a warning that should be consider as an error? Look's more an info no?
> >>>>> What should be the correct behavior if a device want to register two
> >>>>> times the same regulator?
> >>>>
> >>>> Or we can change the name from vdd_XXX to opp_vdd_XXX ?
> >>>> https://elixir.bootlin.com/linux/latest/source/drivers/opp/debugfs.c#L45
> >>>
> >>> Yes, I'm not sure that it's actually a problem in practice. And it may
> >>> well be correct to change this in the generic code rather than try to
> >>> work around it in Panfrost. But we shouldn't spam the user with warnings
> >>> as that makes real issues harder to see.
> >>>
> >>> Your suggestion to change the name seems reasonable to me, but I don't
> >>> fully understand the opp code, so we'd need some review from the OPP
> >>> maintainers. Hopefully Viresh, Nishanth or Stephen can provide some insight.
> >>
> >> Agree, I will send a v2 with the rename and see if OPP Maintainers agree.
> >>
> >> Regards,
> >> Clement
> >>
> >>>
> >>> Steve
>

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Liam and Mark,

On Tue, 14 Apr 2020 at 15:10, Steven Price <steven.price@arm.com> wrote:
>
> Hi Clément,
>
> On 13/04/2020 18:28, Clément Péron wrote:
> > Hi Steven,
> >
> > On Mon, 13 Apr 2020 at 18:35, Clément Péron <peron.clem@gmail.com> wrote:
> >>
> >> Hi Steven,
> >>
> >> On Mon, 13 Apr 2020 at 17:55, Steven Price <steven.price@arm.com> wrote:
> >>>
> >>> On 13/04/2020 15:31, Clément Péron wrote:
> >>>> Hi,
> >>>>
> >>>> On Mon, 13 Apr 2020 at 16:18, Clément Péron <peron.clem@gmail.com> wrote:
> >>>>>
> >>>>> Hi Steven,
> >>>>>
> >>>>> On Mon, 13 Apr 2020 at 15:18, Steven Price <steven.price@arm.com> wrote:
> >>>>>>
> >>>>>> On 11/04/2020 21:06, Clément Péron wrote:
> >>>>>>> OPP table can defined both frequency and voltage.
> >>>>>>>
> >>>>>>> Register the mali regulator if it exist.
> >>>>>>>
> >>>>>>> Signed-off-by: Clément Péron <peron.clem@gmail.com>
> >>>>>>> ---
> >>>>>>>     drivers/gpu/drm/panfrost/panfrost_devfreq.c | 34 ++++++++++++++++++---
> >>>>>>>     drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
> >>>>>>>     2 files changed, 31 insertions(+), 4 deletions(-)
> >>>>>>>
> >>>>>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> >>>>>>> index 62541f4edd81..2dc8e2355358 100644
> >>>>>>> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> >>>>>>> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> >>>>>>> @@ -78,12 +78,26 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> >>>>>>>         struct device *dev = &pfdev->pdev->dev;
> >>>>>>>         struct devfreq *devfreq;
> >>>>>>>         struct thermal_cooling_device *cooling;
> >>>>>>> +     const char *mali = "mali";
> >>>>>>> +     struct opp_table *opp_table = NULL;
> >>>>>>> +
> >>>>>>> +     /* Regulator is optional */
> >>>>>>> +     opp_table = dev_pm_opp_set_regulators(dev, &mali, 1);
> >>>>>>
> >>>>>> This looks like it applies before 3e1399bccf51 ("drm/panfrost: Add
> >>>>>> support for multiple regulators") which is currently in drm-misc-next
> >>>>>> (and linux-next). You want something more like:
> >>>>>
> >>>>> Thanks for you review, indeed I didn't see that multiple regulators
> >>>>> support has been added.
> >>>>> Will update in v2.
> >>>>>
> >>>>>>
> >>>>>>        opp_table = dev_pm_opp_set_regulators(dev,
> >>>>>>                                              pfdev->comp->supply_names,
> >>>>>>                                              pfdev->comp->num_supplies);
> >>>>>>
> >>>>>> Otherwise a platform with multiple regulators won't work correctly.
> >>>>>>
> >>>>>> Also running on my firefly (RK3288) board I get the following warning:
> >>>>>>
> >>>>>>       debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
> >>>>>> present!
> >
> > I try to reproduce but it can't

Sorry, you're right I have indeed the same issue:
[    2.903406] panfrost 1800000.gpu: Features: L2:0x07110206
Shader:0x00000000 Tiler:0x00000809 Mem:0x1 MMU:0x00002821 AS:0xf
JS:0x7
[    2.913297] sunxi-ir 7040000.ir: initialized sunXi IR driver
[    2.919901] panfrost 1800000.gpu: shader_present=0x3 l2_present=0x1
[    2.920497] panfrost 1800000.gpu: Looking up mali-supply from device tree
[    3.036568] vdd-gpu: could not add device link 1800000.gpu err -17
[    3.036580] debugfs: Directory '1800000.gpu-mali' with parent
'vdd-gpu' already present!
[    3.046312] panfrost 1800000.gpu: [drm:panfrost_devfreq_init
[panfrost]] Failed to register cooling device
[    3.056322] [drm] Initialized panfrost 1.1.0 20180908 for
1800000.gpu on minor 0

> > regulator is mount at :
> > ./regulator/vdd-gpu
> > whereas OPP is mount :
> > ./opp/soc-1800000.gpu/opp:756000000/supply-0/
>
> Getting a backtrace from the two occurrences, I see one added from:
>
>    (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
>    (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
>    (_regulator_get) from [<c04682e0>] (regulator_bulk_get+0x64/0xf4)
>    (regulator_bulk_get) from [<c04696f0>]
> (devm_regulator_bulk_get+0x40/0x74)
>    (devm_regulator_bulk_get) from [<bf00af44>]
> (panfrost_device_init+0x1b4/0x48c [panfrost])
>    (panfrost_device_init [panfrost]) from [<bf00a4d4>]
> (panfrost_probe+0x94/0x184 [panfrost])
>    (panfrost_probe [panfrost]) from [<c04ee694>]
> (platform_drv_probe+0x48/0x94)
>
> And the other:
>
>    (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
>    (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
>    (_regulator_get) from [<c05c1280>] (dev_pm_opp_set_regulators+0x6c/0x184)
>    (dev_pm_opp_set_regulators) from [<bf00b4ac>]
> (panfrost_devfreq_init+0x38/0x1ac [panfrost])
>    (panfrost_devfreq_init [panfrost]) from [<bf00a508>]
> (panfrost_probe+0xc8/0x184 [panfrost])
>    (panfrost_probe [panfrost]) from [<c04ee694>]
> (platform_drv_probe+0x48/0x94)
>
> Both are created at /regulator/vdd_gpu

We are having an issue with Panfrost driver registering two times the
same regulator and giving an error when trying to create the debugfs
folder.

Could you clarify if it is allowed for a device to register two times
the same regulator?

I check Documentation/power/regulator/regulator.rst but this point is
not specified.

Thanks,
Clement

>
> >
> > I see that firefly as 2 regulators with the same name :
> > vdd_gpu from syr828
> > (https://github.com/mopplayer/Firefly-RK3288-Kernel-With-Mali764/blob/master/arch/arm/boot/dts/firefly-rk3288.dts#L453)
> > vdd_gpu from rk808_dcdc2_reg
> > (https://github.com/mopplayer/Firefly-RK3288-Kernel-With-Mali764/blob/master/arch/arm/boot/dts/firefly-rk3288.dts#L841)
> >
> > So i think the issue is from the firefly device-tree.
>
> I'm using the DTB from the kernel tree
> (/arch/arm/boot/dts/rk3288-firefly.dts) which as far as I can see
> doesn't contain this problem. Certainly decompiling the DTB I can see
> only one mention of vdd_gpu (in syr828).
>
> Steve
>
> >
> > Regards,
> > Clement
> >
> >>>>>>
> >>>>>> This is due to the regulator debugfs entries getting created twice (once
> >>>>>> in panfrost_regulator_init() and once here).
> >>>>>
> >>>>> Is it a warning that should be consider as an error? Look's more an info no?
> >>>>> What should be the correct behavior if a device want to register two
> >>>>> times the same regulator?
> >>>>
> >>>> Or we can change the name from vdd_XXX to opp_vdd_XXX ?
> >>>> https://elixir.bootlin.com/linux/latest/source/drivers/opp/debugfs.c#L45
> >>>
> >>> Yes, I'm not sure that it's actually a problem in practice. And it may
> >>> well be correct to change this in the generic code rather than try to
> >>> work around it in Panfrost. But we shouldn't spam the user with warnings
> >>> as that makes real issues harder to see.
> >>>
> >>> Your suggestion to change the name seems reasonable to me, but I don't
> >>> fully understand the opp code, so we'd need some review from the OPP
> >>> maintainers. Hopefully Viresh, Nishanth or Stephen can provide some insight.
> >>
> >> Agree, I will send a v2 with the rename and see if OPP Maintainers agree.
> >>
> >> Regards,
> >> Clement
> >>
> >>>
> >>> Steve
>
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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 1011 bytes --]

On Tue, Apr 14, 2020 at 08:20:23PM +0200, Clément Péron wrote:
> Hi Liam and Mark,

You might want to flag stuff like this in the subject line, I very
nearly deleted this without opening it since most of the email I get
about panfrost appears to be coming from me having sent patches rather
than being relevant.

> We are having an issue with Panfrost driver registering two times the
> same regulator and giving an error when trying to create the debugfs
> folder.

> Could you clarify if it is allowed for a device to register two times
> the same regulator?

> I check Documentation/power/regulator/regulator.rst but this point is
> not specified.

We don't actively prevent it and I can't think what other than debugfs
might run into problems (and that's just a warning) but it does seem
like a weird thing to want to do and like it's pointing to some
confusion in your code with two different parts of the device
controlling the same supply independently.  What's the use case here?

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Mark Brown]

[-- Attachment #1.1: Type: text/plain, Size: 1011 bytes --]

On Tue, Apr 14, 2020 at 08:20:23PM +0200, Clément Péron wrote:
> Hi Liam and Mark,

You might want to flag stuff like this in the subject line, I very
nearly deleted this without opening it since most of the email I get
about panfrost appears to be coming from me having sent patches rather
than being relevant.

> We are having an issue with Panfrost driver registering two times the
> same regulator and giving an error when trying to create the debugfs
> folder.

> Could you clarify if it is allowed for a device to register two times
> the same regulator?

> I check Documentation/power/regulator/regulator.rst but this point is
> not specified.

We don't actively prevent it and I can't think what other than debugfs
might run into problems (and that's just a warning) but it does seem
like a weird thing to want to do and like it's pointing to some
confusion in your code with two different parts of the device
controlling the same supply independently.  What's the use case here?

[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

[-- Attachment #2: Type: text/plain, Size: 160 bytes --]

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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Mark,

On Tue, 14 Apr 2020 at 20:55, Mark Brown <broonie@kernel.org> wrote:
>
> On Tue, Apr 14, 2020 at 08:20:23PM +0200, Clément Péron wrote:
> > Hi Liam and Mark,
>
> You might want to flag stuff like this in the subject line, I very
> nearly deleted this without opening it since most of the email I get
> about panfrost appears to be coming from me having sent patches rather
> than being relevant.

Ok will do next time,

>
> > We are having an issue with Panfrost driver registering two times the
> > same regulator and giving an error when trying to create the debugfs
> > folder.
>
> > Could you clarify if it is allowed for a device to register two times
> > the same regulator?
>
> > I check Documentation/power/regulator/regulator.rst but this point is
> > not specified.
>
> We don't actively prevent it and I can't think what other than debugfs
> might run into problems (and that's just a warning) but it does seem
> like a weird thing to want to do and like it's pointing to some
> confusion in your code with two different parts of the device
> controlling the same supply independently.  What's the use case here?

Panfrost first probe clock, reset and regulator in device_init:
https://elixir.bootlin.com/linux/v5.7-rc1/source/drivers/gpu/drm/panfrost/panfrost_drv.c#L602
Then it probe for optional devfreq, devfreq will get opp tables and
also get regulator again.
https://elixir.bootlin.com/linux/v5.7-rc1/source/drivers/gpu/drm/panfrost/panfrost_drv.c#L609

That's can be reworked and Panfrost can only probe regulator if there
is no opp-table.

But if multiple regulator is not an issue and as each request is logic.
The first in device_init assure to enable the regulator and the second
in OPP assure the voltage level.

Maybe we can just fix this warning?

Thanks,
Clement

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Mark,

On Tue, 14 Apr 2020 at 20:55, Mark Brown <broonie@kernel.org> wrote:
>
> On Tue, Apr 14, 2020 at 08:20:23PM +0200, Clément Péron wrote:
> > Hi Liam and Mark,
>
> You might want to flag stuff like this in the subject line, I very
> nearly deleted this without opening it since most of the email I get
> about panfrost appears to be coming from me having sent patches rather
> than being relevant.

Ok will do next time,

>
> > We are having an issue with Panfrost driver registering two times the
> > same regulator and giving an error when trying to create the debugfs
> > folder.
>
> > Could you clarify if it is allowed for a device to register two times
> > the same regulator?
>
> > I check Documentation/power/regulator/regulator.rst but this point is
> > not specified.
>
> We don't actively prevent it and I can't think what other than debugfs
> might run into problems (and that's just a warning) but it does seem
> like a weird thing to want to do and like it's pointing to some
> confusion in your code with two different parts of the device
> controlling the same supply independently.  What's the use case here?

Panfrost first probe clock, reset and regulator in device_init:
https://elixir.bootlin.com/linux/v5.7-rc1/source/drivers/gpu/drm/panfrost/panfrost_drv.c#L602
Then it probe for optional devfreq, devfreq will get opp tables and
also get regulator again.
https://elixir.bootlin.com/linux/v5.7-rc1/source/drivers/gpu/drm/panfrost/panfrost_drv.c#L609

That's can be reworked and Panfrost can only probe regulator if there
is no opp-table.

But if multiple regulator is not an issue and as each request is logic.
The first in device_init assure to enable the regulator and the second
in OPP assure the voltage level.

Maybe we can just fix this warning?

Thanks,
Clement
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Re: Multiple regulators for one device [was drm/panfrost: add devfreq regulator support]

[Steven Price]

On 14/04/2020 20:16, Clément Péron wrote:
> Hi Mark,
> 
> On Tue, 14 Apr 2020 at 20:55, Mark Brown <broonie@kernel.org> wrote:
>>
>> On Tue, Apr 14, 2020 at 08:20:23PM +0200, Clément Péron wrote:
>>> Hi Liam and Mark,
>>
>> You might want to flag stuff like this in the subject line, I very
>> nearly deleted this without opening it since most of the email I get
>> about panfrost appears to be coming from me having sent patches rather
>> than being relevant.
> 
> Ok will do next time,
> 
>>
>>> We are having an issue with Panfrost driver registering two times the
>>> same regulator and giving an error when trying to create the debugfs
>>> folder.
>>
>>> Could you clarify if it is allowed for a device to register two times
>>> the same regulator?
>>
>>> I check Documentation/power/regulator/regulator.rst but this point is
>>> not specified.
>>
>> We don't actively prevent it and I can't think what other than debugfs
>> might run into problems (and that's just a warning) but it does seem
>> like a weird thing to want to do and like it's pointing to some
>> confusion in your code with two different parts of the device
>> controlling the same supply independently.  What's the use case here?
> 
> Panfrost first probe clock, reset and regulator in device_init:
> https://elixir.bootlin.com/linux/v5.7-rc1/source/drivers/gpu/drm/panfrost/panfrost_drv.c#L602
> Then it probe for optional devfreq, devfreq will get opp tables and
> also get regulator again.
> https://elixir.bootlin.com/linux/v5.7-rc1/source/drivers/gpu/drm/panfrost/panfrost_drv.c#L609
> 
> That's can be reworked and Panfrost can only probe regulator if there
> is no opp-table.

This is what I was thinking about looking at. But it may make sense 
instead to extend the regulator API to allow multiple regualtor_get() 
calls for a single device. I haven't had time to dig into how difficult 
this would be.

> But if multiple regulator is not an issue and as each request is logic.
> The first in device_init assure to enable the regulator and the second
> in OPP assure the voltage level.
> 
> Maybe we can just fix this warning?

 From what I can see in the code, just silencing the warning would lead 
to 'odd' behaviour with debugfs. The first struct regulator Panfrost 
acquires is the one that is used purely for turning the GPU on (no 
voltage scaling). The second struct regulator is the one which is 
obtained by the OPP framework. However the debugfs entries point into 
the actual struct regulator, so it would be far more logical/useful if 
those were pointing into the second struct regulator.

Ideally calling regulator_get a second time for the same device would 
simply return the same struct regulator object (with a reference count 
increment).

Perhaps a better approach would be for Panfrost to hand over the struct 
regulator objects it has already got to the OPP framework. I.e. open 
code dev_pm_opp_set_regulators(), but instead of calling 
regulator_get_optional() simply populate the regulators we already have?

The other benefit of that is it would provide a clear hand-over of 
responsibility between Panfrost handling it's own regulators and the OPP 
framework picking up the work. The disadvantage is that Panfrost would 
have to track whether the regulators have been handed over or not.

Steve

Re: Multiple regulators for one device [was drm/panfrost: add devfreq regulator support]

[Steven Price]

On 14/04/2020 20:16, Clément Péron wrote:
> Hi Mark,
> 
> On Tue, 14 Apr 2020 at 20:55, Mark Brown <broonie@kernel.org> wrote:
>>
>> On Tue, Apr 14, 2020 at 08:20:23PM +0200, Clément Péron wrote:
>>> Hi Liam and Mark,
>>
>> You might want to flag stuff like this in the subject line, I very
>> nearly deleted this without opening it since most of the email I get
>> about panfrost appears to be coming from me having sent patches rather
>> than being relevant.
> 
> Ok will do next time,
> 
>>
>>> We are having an issue with Panfrost driver registering two times the
>>> same regulator and giving an error when trying to create the debugfs
>>> folder.
>>
>>> Could you clarify if it is allowed for a device to register two times
>>> the same regulator?
>>
>>> I check Documentation/power/regulator/regulator.rst but this point is
>>> not specified.
>>
>> We don't actively prevent it and I can't think what other than debugfs
>> might run into problems (and that's just a warning) but it does seem
>> like a weird thing to want to do and like it's pointing to some
>> confusion in your code with two different parts of the device
>> controlling the same supply independently.  What's the use case here?
> 
> Panfrost first probe clock, reset and regulator in device_init:
> https://elixir.bootlin.com/linux/v5.7-rc1/source/drivers/gpu/drm/panfrost/panfrost_drv.c#L602
> Then it probe for optional devfreq, devfreq will get opp tables and
> also get regulator again.
> https://elixir.bootlin.com/linux/v5.7-rc1/source/drivers/gpu/drm/panfrost/panfrost_drv.c#L609
> 
> That's can be reworked and Panfrost can only probe regulator if there
> is no opp-table.

This is what I was thinking about looking at. But it may make sense 
instead to extend the regulator API to allow multiple regualtor_get() 
calls for a single device. I haven't had time to dig into how difficult 
this would be.

> But if multiple regulator is not an issue and as each request is logic.
> The first in device_init assure to enable the regulator and the second
> in OPP assure the voltage level.
> 
> Maybe we can just fix this warning?

 From what I can see in the code, just silencing the warning would lead 
to 'odd' behaviour with debugfs. The first struct regulator Panfrost 
acquires is the one that is used purely for turning the GPU on (no 
voltage scaling). The second struct regulator is the one which is 
obtained by the OPP framework. However the debugfs entries point into 
the actual struct regulator, so it would be far more logical/useful if 
those were pointing into the second struct regulator.

Ideally calling regulator_get a second time for the same device would 
simply return the same struct regulator object (with a reference count 
increment).

Perhaps a better approach would be for Panfrost to hand over the struct 
regulator objects it has already got to the OPP framework. I.e. open 
code dev_pm_opp_set_regulators(), but instead of calling 
regulator_get_optional() simply populate the regulators we already have?

The other benefit of that is it would provide a clear hand-over of 
responsibility between Panfrost handling it's own regulators and the OPP 
framework picking up the work. The disadvantage is that Panfrost would 
have to track whether the regulators have been handed over or not.

Steve
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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Mark Brown]

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On Tue, Apr 14, 2020 at 09:16:39PM +0200, Clément Péron wrote:

> But if multiple regulator is not an issue and as each request is logic.
> The first in device_init assure to enable the regulator and the second
> in OPP assure the voltage level.

> Maybe we can just fix this warning?

Well, if you have a tasteful way of doing it I guess.

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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Mark Brown]

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On Tue, Apr 14, 2020 at 09:16:39PM +0200, Clément Péron wrote:

> But if multiple regulator is not an issue and as each request is logic.
> The first in device_init assure to enable the regulator and the second
> in OPP assure the voltage level.

> Maybe we can just fix this warning?

Well, if you have a tasteful way of doing it I guess.

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Re: Multiple regulators for one device [was drm/panfrost: add devfreq regulator support]

[Mark Brown]

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On Thu, Apr 16, 2020 at 02:42:13PM +0100, Steven Price wrote:
> On 14/04/2020 20:16, Clément Péron wrote:

> > That's can be reworked and Panfrost can only probe regulator if there
> > is no opp-table.

> This is what I was thinking about looking at. But it may make sense instead
> to extend the regulator API to allow multiple regualtor_get() calls for a
> single device. I haven't had time to dig into how difficult this would be.

To repeat what I said before we don't actively stop this, it's just not
something that seems particularly tasteful and the warning does find
actual errors.  I definitely don't think it's a good idea to extend the
API for this.

> Ideally calling regulator_get a second time for the same device would simply
> return the same struct regulator object (with a reference count increment).

One of the goals with the distinct struct regulator is to make sure that
we track all the user's activity together - if we mix multiple users in
there it becomes harder to tell if something is going wrong.

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Re: Multiple regulators for one device [was drm/panfrost: add devfreq regulator support]

[Mark Brown]

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On Thu, Apr 16, 2020 at 02:42:13PM +0100, Steven Price wrote:
> On 14/04/2020 20:16, Clément Péron wrote:

> > That's can be reworked and Panfrost can only probe regulator if there
> > is no opp-table.

> This is what I was thinking about looking at. But it may make sense instead
> to extend the regulator API to allow multiple regualtor_get() calls for a
> single device. I haven't had time to dig into how difficult this would be.

To repeat what I said before we don't actively stop this, it's just not
something that seems particularly tasteful and the warning does find
actual errors.  I definitely don't think it's a good idea to extend the
API for this.

> Ideally calling regulator_get a second time for the same device would simply
> return the same struct regulator object (with a reference count increment).

One of the goals with the distinct struct regulator is to make sure that
we track all the user's activity together - if we mix multiple users in
there it becomes harder to tell if something is going wrong.

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Re: Multiple regulators for one device [was drm/panfrost: add devfreq regulator support]

[Robin Murphy]

On 2020-04-16 2:42 pm, Steven Price wrote:
[...]
> Perhaps a better approach would be for Panfrost to hand over the struct 
> regulator objects it has already got to the OPP framework. I.e. open 
> code dev_pm_opp_set_regulators(), but instead of calling 
> regulator_get_optional() simply populate the regulators we already have?
> 
> The other benefit of that is it would provide a clear hand-over of 
> responsibility between Panfrost handling it's own regulators and the OPP 
> framework picking up the work. The disadvantage is that Panfrost would 
> have to track whether the regulators have been handed over or not.

Sounds like the most logical thing to do is to shuffle things around so 
we start by trying to set up an OPP table, then fall back to explicitly 
claiming clocks and regulators if necessary. Then we can easily make the 
devfreq decision later in probe based on how that turned out.

Robin.

Re: Multiple regulators for one device [was drm/panfrost: add devfreq regulator support]

[Robin Murphy]

On 2020-04-16 2:42 pm, Steven Price wrote:
[...]
> Perhaps a better approach would be for Panfrost to hand over the struct 
> regulator objects it has already got to the OPP framework. I.e. open 
> code dev_pm_opp_set_regulators(), but instead of calling 
> regulator_get_optional() simply populate the regulators we already have?
> 
> The other benefit of that is it would provide a clear hand-over of 
> responsibility between Panfrost handling it's own regulators and the OPP 
> framework picking up the work. The disadvantage is that Panfrost would 
> have to track whether the regulators have been handed over or not.

Sounds like the most logical thing to do is to shuffle things around so 
we start by trying to set up an OPP table, then fall back to explicitly 
claiming clocks and regulators if necessary. Then we can easily make the 
devfreq decision later in probe based on how that turned out.

Robin.
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Re: Multiple regulators for one device [was drm/panfrost: add devfreq regulator support]

[Clément Péron]

Hi Robin,

On Fri, 17 Apr 2020 at 13:10, Robin Murphy <robin.murphy@arm.com> wrote:
>
> On 2020-04-16 2:42 pm, Steven Price wrote:
> [...]
> > Perhaps a better approach would be for Panfrost to hand over the struct
> > regulator objects it has already got to the OPP framework. I.e. open
> > code dev_pm_opp_set_regulators(), but instead of calling
> > regulator_get_optional() simply populate the regulators we already have?
> >
> > The other benefit of that is it would provide a clear hand-over of
> > responsibility between Panfrost handling it's own regulators and the OPP
> > framework picking up the work. The disadvantage is that Panfrost would
> > have to track whether the regulators have been handed over or not.
>
> Sounds like the most logical thing to do is to shuffle things around so
> we start by trying to set up an OPP table, then fall back to explicitly
> claiming clocks and regulators if necessary. Then we can easily make the
> devfreq decision later in probe based on how that turned out.

Ok I will propose a new serie with this behavior,

Thanks
Clement

>
> Robin.

Re: Multiple regulators for one device [was drm/panfrost: add devfreq regulator support]

[Clément Péron]

Hi Robin,

On Fri, 17 Apr 2020 at 13:10, Robin Murphy <robin.murphy@arm.com> wrote:
>
> On 2020-04-16 2:42 pm, Steven Price wrote:
> [...]
> > Perhaps a better approach would be for Panfrost to hand over the struct
> > regulator objects it has already got to the OPP framework. I.e. open
> > code dev_pm_opp_set_regulators(), but instead of calling
> > regulator_get_optional() simply populate the regulators we already have?
> >
> > The other benefit of that is it would provide a clear hand-over of
> > responsibility between Panfrost handling it's own regulators and the OPP
> > framework picking up the work. The disadvantage is that Panfrost would
> > have to track whether the regulators have been handed over or not.
>
> Sounds like the most logical thing to do is to shuffle things around so
> we start by trying to set up an OPP table, then fall back to explicitly
> claiming clocks and regulators if necessary. Then we can easily make the
> devfreq decision later in probe based on how that turned out.

Ok I will propose a new serie with this behavior,

Thanks
Clement

>
> Robin.
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Re: Multiple regulators for one device [was drm/panfrost: add devfreq regulator support]

[Clément Péron]

Hi,

On Fri, 17 Apr 2020 at 14:33, Clément Péron <peron.clem@gmail.com> wrote:
>
> Hi Robin,
>
> On Fri, 17 Apr 2020 at 13:10, Robin Murphy <robin.murphy@arm.com> wrote:
> >
> > On 2020-04-16 2:42 pm, Steven Price wrote:
> > [...]
> > > Perhaps a better approach would be for Panfrost to hand over the struct
> > > regulator objects it has already got to the OPP framework. I.e. open
> > > code dev_pm_opp_set_regulators(), but instead of calling
> > > regulator_get_optional() simply populate the regulators we already have?

Just saw that a Lima devfreq[0] has been also introduced with I think
exactly the same logic.

Is this something that hasn't been triggered by Maintainer or I am
missing something?

I will backport some remarks made on the lima devfreq to improve panfrost one.
They are almost identical.

Regards,
Clement

0: https://cgit.freedesktop.org/drm-misc/commit/?id=1996970773a323533e1cc1b6b97f00a95d675f32

> > >
> > > The other benefit of that is it would provide a clear hand-over of
> > > responsibility between Panfrost handling it's own regulators and the OPP
> > > framework picking up the work. The disadvantage is that Panfrost would
> > > have to track whether the regulators have been handed over or not.
> >
> > Sounds like the most logical thing to do is to shuffle things around so
> > we start by trying to set up an OPP table, then fall back to explicitly
> > claiming clocks and regulators if necessary. Then we can easily make the
> > devfreq decision later in probe based on how that turned out.
>
> Ok I will propose a new serie with this behavior,
>
> Thanks
> Clement
>
> >
> > Robin.

Re: Multiple regulators for one device [was drm/panfrost: add devfreq regulator support]

[Clément Péron]

Hi,

On Fri, 17 Apr 2020 at 14:33, Clément Péron <peron.clem@gmail.com> wrote:
>
> Hi Robin,
>
> On Fri, 17 Apr 2020 at 13:10, Robin Murphy <robin.murphy@arm.com> wrote:
> >
> > On 2020-04-16 2:42 pm, Steven Price wrote:
> > [...]
> > > Perhaps a better approach would be for Panfrost to hand over the struct
> > > regulator objects it has already got to the OPP framework. I.e. open
> > > code dev_pm_opp_set_regulators(), but instead of calling
> > > regulator_get_optional() simply populate the regulators we already have?

Just saw that a Lima devfreq[0] has been also introduced with I think
exactly the same logic.

Is this something that hasn't been triggered by Maintainer or I am
missing something?

I will backport some remarks made on the lima devfreq to improve panfrost one.
They are almost identical.

Regards,
Clement

0: https://cgit.freedesktop.org/drm-misc/commit/?id=1996970773a323533e1cc1b6b97f00a95d675f32

> > >
> > > The other benefit of that is it would provide a clear hand-over of
> > > responsibility between Panfrost handling it's own regulators and the OPP
> > > framework picking up the work. The disadvantage is that Panfrost would
> > > have to track whether the regulators have been handed over or not.
> >
> > Sounds like the most logical thing to do is to shuffle things around so
> > we start by trying to set up an OPP table, then fall back to explicitly
> > claiming clocks and regulators if necessary. Then we can easily make the
> > devfreq decision later in probe based on how that turned out.
>
> Ok I will propose a new serie with this behavior,
>
> Thanks
> Clement
>
> >
> > Robin.
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Re: Multiple regulators for one device [was drm/panfrost: add devfreq regulator support]

[Mark Brown]

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On Sun, Apr 19, 2020 at 11:25:08AM +0200, Clément Péron wrote:

> Just saw that a Lima devfreq[0] has been also introduced with I think
> exactly the same logic.

> Is this something that hasn't been triggered by Maintainer or I am
> missing something?

My understanding is that there is very little use of any of this
upstream since it's all pretty new, some platforms have OPPs but use a
firmware interface rather than the OS to control clocks and regulators
while most other platforms don't have OPPs defined and it's only
platforms with both regulators and OPPs that are affected.

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Re: Multiple regulators for one device [was drm/panfrost: add devfreq regulator support]

[Mark Brown]

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On Sun, Apr 19, 2020 at 11:25:08AM +0200, Clément Péron wrote:

> Just saw that a Lima devfreq[0] has been also introduced with I think
> exactly the same logic.

> Is this something that hasn't been triggered by Maintainer or I am
> missing something?

My understanding is that there is very little use of any of this
upstream since it's all pretty new, some platforms have OPPs but use a
firmware interface rather than the OS to control clocks and regulators
while most other platforms don't have OPPs defined and it's only
platforms with both regulators and OPPs that are affected.

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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Steven,

On Tue, 14 Apr 2020 at 15:10, Steven Price <steven.price@arm.com> wrote:
>
> Hi Clément,
>
> On 13/04/2020 18:28, Clément Péron wrote:
> > Hi Steven,
> >

<snip>

> Getting a backtrace from the two occurrences, I see one added from:
>
>    (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
>    (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
>    (_regulator_get) from [<c04682e0>] (regulator_bulk_get+0x64/0xf4)
>    (regulator_bulk_get) from [<c04696f0>]
> (devm_regulator_bulk_get+0x40/0x74)
>    (devm_regulator_bulk_get) from [<bf00af44>]
> (panfrost_device_init+0x1b4/0x48c [panfrost])
>    (panfrost_device_init [panfrost]) from [<bf00a4d4>]
> (panfrost_probe+0x94/0x184 [panfrost])
>    (panfrost_probe [panfrost]) from [<c04ee694>]
> (platform_drv_probe+0x48/0x94)
>
> And the other:
>
>    (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
>    (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
>    (_regulator_get) from [<c05c1280>] (dev_pm_opp_set_regulators+0x6c/0x184)
>    (dev_pm_opp_set_regulators) from [<bf00b4ac>]
> (panfrost_devfreq_init+0x38/0x1ac [panfrost])
>    (panfrost_devfreq_init [panfrost]) from [<bf00a508>]
> (panfrost_probe+0xc8/0x184 [panfrost])
>    (panfrost_probe [panfrost]) from [<c04ee694>]
> (platform_drv_probe+0x48/0x94)
>
> Both are created at /regulator/vdd_gpu

I'm preparing a new version with some clean from lima devfreq.
My working branch :
https://github.com/clementperon/linux/commits/panfrost_devfreq

Two strange things I observe:
 - After 30sec the regulator is released by OPP ???
[   33.757627] vdd-gpu: disabling
Introduce the regulator support in this commit:
https://github.com/clementperon/linux/commit/be310c37b82010e293b7f129ccdcb711a2abb2ce

 - The Cooling map is not probe correctly :
[    2.545756] panfrost 1800000.gpu: [drm:panfrost_devfreq_init
[panfrost]] Failed to register cooling device
Introduce in this commit :
https://github.com/clementperon/linux/commit/0252c38fd55ad78366ac4b1714e285c88db34557

Do you have an hint about what I'm missing ?

Thanks for your help,
Clement

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Steven,

On Tue, 14 Apr 2020 at 15:10, Steven Price <steven.price@arm.com> wrote:
>
> Hi Clément,
>
> On 13/04/2020 18:28, Clément Péron wrote:
> > Hi Steven,
> >

<snip>

> Getting a backtrace from the two occurrences, I see one added from:
>
>    (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
>    (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
>    (_regulator_get) from [<c04682e0>] (regulator_bulk_get+0x64/0xf4)
>    (regulator_bulk_get) from [<c04696f0>]
> (devm_regulator_bulk_get+0x40/0x74)
>    (devm_regulator_bulk_get) from [<bf00af44>]
> (panfrost_device_init+0x1b4/0x48c [panfrost])
>    (panfrost_device_init [panfrost]) from [<bf00a4d4>]
> (panfrost_probe+0x94/0x184 [panfrost])
>    (panfrost_probe [panfrost]) from [<c04ee694>]
> (platform_drv_probe+0x48/0x94)
>
> And the other:
>
>    (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
>    (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
>    (_regulator_get) from [<c05c1280>] (dev_pm_opp_set_regulators+0x6c/0x184)
>    (dev_pm_opp_set_regulators) from [<bf00b4ac>]
> (panfrost_devfreq_init+0x38/0x1ac [panfrost])
>    (panfrost_devfreq_init [panfrost]) from [<bf00a508>]
> (panfrost_probe+0xc8/0x184 [panfrost])
>    (panfrost_probe [panfrost]) from [<c04ee694>]
> (platform_drv_probe+0x48/0x94)
>
> Both are created at /regulator/vdd_gpu

I'm preparing a new version with some clean from lima devfreq.
My working branch :
https://github.com/clementperon/linux/commits/panfrost_devfreq

Two strange things I observe:
 - After 30sec the regulator is released by OPP ???
[   33.757627] vdd-gpu: disabling
Introduce the regulator support in this commit:
https://github.com/clementperon/linux/commit/be310c37b82010e293b7f129ccdcb711a2abb2ce

 - The Cooling map is not probe correctly :
[    2.545756] panfrost 1800000.gpu: [drm:panfrost_devfreq_init
[panfrost]] Failed to register cooling device
Introduce in this commit :
https://github.com/clementperon/linux/commit/0252c38fd55ad78366ac4b1714e285c88db34557

Do you have an hint about what I'm missing ?

Thanks for your help,
Clement
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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Steven Price]

On 02/05/2020 23:07, Clément Péron wrote:
> Hi Steven,
> 
> On Tue, 14 Apr 2020 at 15:10, Steven Price <steven.price@arm.com> wrote:
>>
>> Hi Clément,
>>
>> On 13/04/2020 18:28, Clément Péron wrote:
>>> Hi Steven,
>>>
> 
> <snip>
> 
>> Getting a backtrace from the two occurrences, I see one added from:
>>
>>     (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
>>     (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
>>     (_regulator_get) from [<c04682e0>] (regulator_bulk_get+0x64/0xf4)
>>     (regulator_bulk_get) from [<c04696f0>]
>> (devm_regulator_bulk_get+0x40/0x74)
>>     (devm_regulator_bulk_get) from [<bf00af44>]
>> (panfrost_device_init+0x1b4/0x48c [panfrost])
>>     (panfrost_device_init [panfrost]) from [<bf00a4d4>]
>> (panfrost_probe+0x94/0x184 [panfrost])
>>     (panfrost_probe [panfrost]) from [<c04ee694>]
>> (platform_drv_probe+0x48/0x94)
>>
>> And the other:
>>
>>     (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
>>     (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
>>     (_regulator_get) from [<c05c1280>] (dev_pm_opp_set_regulators+0x6c/0x184)
>>     (dev_pm_opp_set_regulators) from [<bf00b4ac>]
>> (panfrost_devfreq_init+0x38/0x1ac [panfrost])
>>     (panfrost_devfreq_init [panfrost]) from [<bf00a508>]
>> (panfrost_probe+0xc8/0x184 [panfrost])
>>     (panfrost_probe [panfrost]) from [<c04ee694>]
>> (platform_drv_probe+0x48/0x94)
>>
>> Both are created at /regulator/vdd_gpu
> 
> I'm preparing a new version with some clean from lima devfreq.
> My working branch :
> https://github.com/clementperon/linux/commits/panfrost_devfreq

I had a look at that branch and gave it a quick spin on my Firefly 
RK3288 and didn't notice any issues.

> Two strange things I observe:
>   - After 30sec the regulator is released by OPP ???
> [   33.757627] vdd-gpu: disabling
> Introduce the regulator support in this commit:
> https://github.com/clementperon/linux/commit/be310c37b82010e293b7f129ccdcb711a2abb2ce

I can't see anything wrong with this commit, but equally in my DTS I 
have a "regulator-always-on" for vdd_gpu. My initial thought was that 
this could be runtime PM of the GPU - but I can't see how 
panfrost_device_suspend() would end up turning off the regulator. So 
unless there's some way that the regulator itself suspends (but it 
should know it's in use) I've no clue why this would be happening.

Since you've got a reproduction - can you get a backtrace where the 
regulator is getting disabled?

>   - The Cooling map is not probe correctly :
> [    2.545756] panfrost 1800000.gpu: [drm:panfrost_devfreq_init
> [panfrost]] Failed to register cooling device
> Introduce in this commit :
> https://github.com/clementperon/linux/commit/0252c38fd55ad78366ac4b1714e285c88db34557
> 
> Do you have an hint about what I'm missing ?

Sorry, my knowledge of the cooling framework is very limited. What 
you've got looks plausible, but I'm afraid I can't really help beyond 
that! As before - can you try adding some printk()s in e.g. 
of_devfreq_cooling_register_power() and find out where it is bailing out?

Steve

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Steven Price]

On 02/05/2020 23:07, Clément Péron wrote:
> Hi Steven,
> 
> On Tue, 14 Apr 2020 at 15:10, Steven Price <steven.price@arm.com> wrote:
>>
>> Hi Clément,
>>
>> On 13/04/2020 18:28, Clément Péron wrote:
>>> Hi Steven,
>>>
> 
> <snip>
> 
>> Getting a backtrace from the two occurrences, I see one added from:
>>
>>     (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
>>     (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
>>     (_regulator_get) from [<c04682e0>] (regulator_bulk_get+0x64/0xf4)
>>     (regulator_bulk_get) from [<c04696f0>]
>> (devm_regulator_bulk_get+0x40/0x74)
>>     (devm_regulator_bulk_get) from [<bf00af44>]
>> (panfrost_device_init+0x1b4/0x48c [panfrost])
>>     (panfrost_device_init [panfrost]) from [<bf00a4d4>]
>> (panfrost_probe+0x94/0x184 [panfrost])
>>     (panfrost_probe [panfrost]) from [<c04ee694>]
>> (platform_drv_probe+0x48/0x94)
>>
>> And the other:
>>
>>     (debugfs_create_dir) from [<c04633f8>] (create_regulator+0xe0/0x220)
>>     (create_regulator) from [<c04681d8>] (_regulator_get+0x168/0x204)
>>     (_regulator_get) from [<c05c1280>] (dev_pm_opp_set_regulators+0x6c/0x184)
>>     (dev_pm_opp_set_regulators) from [<bf00b4ac>]
>> (panfrost_devfreq_init+0x38/0x1ac [panfrost])
>>     (panfrost_devfreq_init [panfrost]) from [<bf00a508>]
>> (panfrost_probe+0xc8/0x184 [panfrost])
>>     (panfrost_probe [panfrost]) from [<c04ee694>]
>> (platform_drv_probe+0x48/0x94)
>>
>> Both are created at /regulator/vdd_gpu
> 
> I'm preparing a new version with some clean from lima devfreq.
> My working branch :
> https://github.com/clementperon/linux/commits/panfrost_devfreq

I had a look at that branch and gave it a quick spin on my Firefly 
RK3288 and didn't notice any issues.

> Two strange things I observe:
>   - After 30sec the regulator is released by OPP ???
> [   33.757627] vdd-gpu: disabling
> Introduce the regulator support in this commit:
> https://github.com/clementperon/linux/commit/be310c37b82010e293b7f129ccdcb711a2abb2ce

I can't see anything wrong with this commit, but equally in my DTS I 
have a "regulator-always-on" for vdd_gpu. My initial thought was that 
this could be runtime PM of the GPU - but I can't see how 
panfrost_device_suspend() would end up turning off the regulator. So 
unless there's some way that the regulator itself suspends (but it 
should know it's in use) I've no clue why this would be happening.

Since you've got a reproduction - can you get a backtrace where the 
regulator is getting disabled?

>   - The Cooling map is not probe correctly :
> [    2.545756] panfrost 1800000.gpu: [drm:panfrost_devfreq_init
> [panfrost]] Failed to register cooling device
> Introduce in this commit :
> https://github.com/clementperon/linux/commit/0252c38fd55ad78366ac4b1714e285c88db34557
> 
> Do you have an hint about what I'm missing ?

Sorry, my knowledge of the cooling framework is very limited. What 
you've got looks plausible, but I'm afraid I can't really help beyond 
that! As before - can you try adding some printk()s in e.g. 
of_devfreq_cooling_register_power() and find out where it is bailing out?

Steve
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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Steven,

On Thu, 7 May 2020 at 16:30, Steven Price <steven.price@arm.com> wrote:
>
> On 02/05/2020 23:07, Clément Péron wrote:
> > Hi Steven,
> >
> > On Tue, 14 Apr 2020 at 15:10, Steven Price <steven.price@arm.com> wrote:
> >>
> >> Hi Clément,
> >>
> >> On 13/04/2020 18:28, Clément Péron wrote:
> >>> Hi Steven,
> >>>
> >
<snip>
>
> Since you've got a reproduction - can you get a backtrace where the
> regulator is getting disabled?

Regulator is disabled from regulator_late_cleanup()

[   33.757650] vdd-gpu: disabling
[   33.760718] CPU: 2 PID: 31 Comm: kworker/2:1 Not tainted
5.7.0-rc2-next-20200424 #8
[   33.768362] Hardware name: Beelink GS1 (DT)
[   33.772553] Workqueue: events regulator_init_complete_work_function
[   33.778813] Call trace:
[   33.781261]  dump_backtrace+0x0/0x1a0
[   33.784922]  show_stack+0x18/0x30
[   33.788238]  dump_stack+0xc0/0x114
[   33.791638]  regulator_late_cleanup+0x164/0x1f0
[   33.796165]  class_for_each_device+0x64/0xe0
[   33.800431]  regulator_init_complete_work_function+0x4c/0x60
[   33.806084]  process_one_work+0x19c/0x330
[   33.810090]  worker_thread+0x4c/0x430
[   33.813748]  kthread+0x138/0x160
[   33.816973]  ret_from_fork+0x10/0x24

the use_count is at 0...

I have check and the regulator_get is called and regulator_put is
never called for vdd-gpu.
Not sure what is happening here...


>
> >   - The Cooling map is not probe correctly :
> > [    2.545756] panfrost 1800000.gpu: [drm:panfrost_devfreq_init
> > [panfrost]] Failed to register cooling device
> > Introduce in this commit :
> > https://github.com/clementperon/linux/commit/0252c38fd55ad78366ac4b1714e285c88db34557
> >
> > Do you have an hint about what I'm missing ?
>
> Sorry, my knowledge of the cooling framework is very limited. What
> you've got looks plausible, but I'm afraid I can't really help beyond
> that! As before - can you try adding some printk()s in e.g.
> of_devfreq_cooling_register_power() and find out where it is bailing out?

Dumb issue, I was missing the CONFIG_DEVFREQ_THERMAL -_-, I will make
a patch to enable it in arm64 defconfig.

Regards,
Clement

>
> Steve

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

Hi Steven,

On Thu, 7 May 2020 at 16:30, Steven Price <steven.price@arm.com> wrote:
>
> On 02/05/2020 23:07, Clément Péron wrote:
> > Hi Steven,
> >
> > On Tue, 14 Apr 2020 at 15:10, Steven Price <steven.price@arm.com> wrote:
> >>
> >> Hi Clément,
> >>
> >> On 13/04/2020 18:28, Clément Péron wrote:
> >>> Hi Steven,
> >>>
> >
<snip>
>
> Since you've got a reproduction - can you get a backtrace where the
> regulator is getting disabled?

Regulator is disabled from regulator_late_cleanup()

[   33.757650] vdd-gpu: disabling
[   33.760718] CPU: 2 PID: 31 Comm: kworker/2:1 Not tainted
5.7.0-rc2-next-20200424 #8
[   33.768362] Hardware name: Beelink GS1 (DT)
[   33.772553] Workqueue: events regulator_init_complete_work_function
[   33.778813] Call trace:
[   33.781261]  dump_backtrace+0x0/0x1a0
[   33.784922]  show_stack+0x18/0x30
[   33.788238]  dump_stack+0xc0/0x114
[   33.791638]  regulator_late_cleanup+0x164/0x1f0
[   33.796165]  class_for_each_device+0x64/0xe0
[   33.800431]  regulator_init_complete_work_function+0x4c/0x60
[   33.806084]  process_one_work+0x19c/0x330
[   33.810090]  worker_thread+0x4c/0x430
[   33.813748]  kthread+0x138/0x160
[   33.816973]  ret_from_fork+0x10/0x24

the use_count is at 0...

I have check and the regulator_get is called and regulator_put is
never called for vdd-gpu.
Not sure what is happening here...


>
> >   - The Cooling map is not probe correctly :
> > [    2.545756] panfrost 1800000.gpu: [drm:panfrost_devfreq_init
> > [panfrost]] Failed to register cooling device
> > Introduce in this commit :
> > https://github.com/clementperon/linux/commit/0252c38fd55ad78366ac4b1714e285c88db34557
> >
> > Do you have an hint about what I'm missing ?
>
> Sorry, my knowledge of the cooling framework is very limited. What
> you've got looks plausible, but I'm afraid I can't really help beyond
> that! As before - can you try adding some printk()s in e.g.
> of_devfreq_cooling_register_power() and find out where it is bailing out?

Dumb issue, I was missing the CONFIG_DEVFREQ_THERMAL -_-, I will make
a patch to enable it in arm64 defconfig.

Regards,
Clement

>
> Steve
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Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

On Sat, 9 May 2020 at 18:28, Clément Péron <peron.clem@gmail.com> wrote:
>
> Hi Steven,
>
> On Thu, 7 May 2020 at 16:30, Steven Price <steven.price@arm.com> wrote:
> >
> > On 02/05/2020 23:07, Clément Péron wrote:
> > > Hi Steven,
> > >
> > > On Tue, 14 Apr 2020 at 15:10, Steven Price <steven.price@arm.com> wrote:
> > >>
> > >> Hi Clément,
> > >>
> > >> On 13/04/2020 18:28, Clément Péron wrote:
> > >>> Hi Steven,
> > >>>
> > >
> <snip>
> >
> > Since you've got a reproduction - can you get a backtrace where the
> > regulator is getting disabled?
>
> Regulator is disabled from regulator_late_cleanup()
>
> [   33.757650] vdd-gpu: disabling
> [   33.760718] CPU: 2 PID: 31 Comm: kworker/2:1 Not tainted
> 5.7.0-rc2-next-20200424 #8
> [   33.768362] Hardware name: Beelink GS1 (DT)
> [   33.772553] Workqueue: events regulator_init_complete_work_function
> [   33.778813] Call trace:
> [   33.781261]  dump_backtrace+0x0/0x1a0
> [   33.784922]  show_stack+0x18/0x30
> [   33.788238]  dump_stack+0xc0/0x114
> [   33.791638]  regulator_late_cleanup+0x164/0x1f0
> [   33.796165]  class_for_each_device+0x64/0xe0
> [   33.800431]  regulator_init_complete_work_function+0x4c/0x60
> [   33.806084]  process_one_work+0x19c/0x330
> [   33.810090]  worker_thread+0x4c/0x430
> [   33.813748]  kthread+0x138/0x160
> [   33.816973]  ret_from_fork+0x10/0x24
>
> the use_count is at 0...
>
> I have check and the regulator_get is called and regulator_put is
> never called for vdd-gpu.
> Not sure what is happening here...

Looks like the OPP framework only get the regulator but never enable it...

I will send a question to OPP Maintainer about this.

Regards,
CLement

>
>
> >
> > >   - The Cooling map is not probe correctly :
> > > [    2.545756] panfrost 1800000.gpu: [drm:panfrost_devfreq_init
> > > [panfrost]] Failed to register cooling device
> > > Introduce in this commit :
> > > https://github.com/clementperon/linux/commit/0252c38fd55ad78366ac4b1714e285c88db34557
> > >
> > > Do you have an hint about what I'm missing ?
> >
> > Sorry, my knowledge of the cooling framework is very limited. What
> > you've got looks plausible, but I'm afraid I can't really help beyond
> > that! As before - can you try adding some printk()s in e.g.
> > of_devfreq_cooling_register_power() and find out where it is bailing out?
>
> Dumb issue, I was missing the CONFIG_DEVFREQ_THERMAL -_-, I will make
> a patch to enable it in arm64 defconfig.
>
> Regards,
> Clement
>
> >
> > Steve

Re: [PATCH 2/2] drm/panfrost: add devfreq regulator support

[Clément Péron]

On Sat, 9 May 2020 at 18:28, Clément Péron <peron.clem@gmail.com> wrote:
>
> Hi Steven,
>
> On Thu, 7 May 2020 at 16:30, Steven Price <steven.price@arm.com> wrote:
> >
> > On 02/05/2020 23:07, Clément Péron wrote:
> > > Hi Steven,
> > >
> > > On Tue, 14 Apr 2020 at 15:10, Steven Price <steven.price@arm.com> wrote:
> > >>
> > >> Hi Clément,
> > >>
> > >> On 13/04/2020 18:28, Clément Péron wrote:
> > >>> Hi Steven,
> > >>>
> > >
> <snip>
> >
> > Since you've got a reproduction - can you get a backtrace where the
> > regulator is getting disabled?
>
> Regulator is disabled from regulator_late_cleanup()
>
> [   33.757650] vdd-gpu: disabling
> [   33.760718] CPU: 2 PID: 31 Comm: kworker/2:1 Not tainted
> 5.7.0-rc2-next-20200424 #8
> [   33.768362] Hardware name: Beelink GS1 (DT)
> [   33.772553] Workqueue: events regulator_init_complete_work_function
> [   33.778813] Call trace:
> [   33.781261]  dump_backtrace+0x0/0x1a0
> [   33.784922]  show_stack+0x18/0x30
> [   33.788238]  dump_stack+0xc0/0x114
> [   33.791638]  regulator_late_cleanup+0x164/0x1f0
> [   33.796165]  class_for_each_device+0x64/0xe0
> [   33.800431]  regulator_init_complete_work_function+0x4c/0x60
> [   33.806084]  process_one_work+0x19c/0x330
> [   33.810090]  worker_thread+0x4c/0x430
> [   33.813748]  kthread+0x138/0x160
> [   33.816973]  ret_from_fork+0x10/0x24
>
> the use_count is at 0...
>
> I have check and the regulator_get is called and regulator_put is
> never called for vdd-gpu.
> Not sure what is happening here...

Looks like the OPP framework only get the regulator but never enable it...

I will send a question to OPP Maintainer about this.

Regards,
CLement

>
>
> >
> > >   - The Cooling map is not probe correctly :
> > > [    2.545756] panfrost 1800000.gpu: [drm:panfrost_devfreq_init
> > > [panfrost]] Failed to register cooling device
> > > Introduce in this commit :
> > > https://github.com/clementperon/linux/commit/0252c38fd55ad78366ac4b1714e285c88db34557
> > >
> > > Do you have an hint about what I'm missing ?
> >
> > Sorry, my knowledge of the cooling framework is very limited. What
> > you've got looks plausible, but I'm afraid I can't really help beyond
> > that! As before - can you try adding some printk()s in e.g.
> > of_devfreq_cooling_register_power() and find out where it is bailing out?
>
> Dumb issue, I was missing the CONFIG_DEVFREQ_THERMAL -_-, I will make
> a patch to enable it in arm64 defconfig.
>
> Regards,
> Clement
>
> >
> > Steve
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