drm/panfrost: Remove core stack power management
diff mbox series

Message ID 20200109133104.11661-1-steven.price@arm.com
State New
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Series
  • drm/panfrost: Remove core stack power management
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Commit Message

Steven Price Jan. 9, 2020, 1:31 p.m. UTC
Explict management of the GPU's core stacks is only necessary in the
case of a broken integration with the PDC. Since there are no known
platforms which have such a broken integration let's remove the explict
control from the driver since this apparently causes problems on other
platforms and will have a small performance penality.

The out of tree mali_kbase driver contains this text regarding
controlling the core stack (CONFIGMALI_CORESTACK):

  Enabling this feature on supported GPUs will let the driver powering
  on/off the GPU core stack independently without involving the Power
  Domain Controller. This should only be enabled on platforms which
  integration of the PDC to the Mali GPU is known to be problematic.
  This feature is currently only supported on t-Six and t-HEx GPUs.

  If unsure, say N.

Signed-off-by: Steven Price <steven.price@arm.com>
---
 drivers/gpu/drm/panfrost/panfrost_gpu.c | 5 -----
 1 file changed, 5 deletions(-)

Comments

Alyssa Rosenzweig Jan. 9, 2020, 1:43 p.m. UTC | #1
A-b

On Thu, Jan 09, 2020 at 01:31:04PM +0000, Steven Price wrote:
> Explict management of the GPU's core stacks is only necessary in the
> case of a broken integration with the PDC. Since there are no known
> platforms which have such a broken integration let's remove the explict
> control from the driver since this apparently causes problems on other
> platforms and will have a small performance penality.
> 
> The out of tree mali_kbase driver contains this text regarding
> controlling the core stack (CONFIGMALI_CORESTACK):
> 
>   Enabling this feature on supported GPUs will let the driver powering
>   on/off the GPU core stack independently without involving the Power
>   Domain Controller. This should only be enabled on platforms which
>   integration of the PDC to the Mali GPU is known to be problematic.
>   This feature is currently only supported on t-Six and t-HEx GPUs.
> 
>   If unsure, say N.
> 
> Signed-off-by: Steven Price <steven.price@arm.com>
> ---
>  drivers/gpu/drm/panfrost/panfrost_gpu.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
> index 8822ec13a0d6..460fc190de6e 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
> @@ -309,10 +309,6 @@ void panfrost_gpu_power_on(struct panfrost_device *pfdev)
>  	ret = readl_relaxed_poll_timeout(pfdev->iomem + L2_READY_LO,
>  		val, val == pfdev->features.l2_present, 100, 1000);
>  
> -	gpu_write(pfdev, STACK_PWRON_LO, pfdev->features.stack_present);
> -	ret |= readl_relaxed_poll_timeout(pfdev->iomem + STACK_READY_LO,
> -		val, val == pfdev->features.stack_present, 100, 1000);
> -
>  	gpu_write(pfdev, SHADER_PWRON_LO, pfdev->features.shader_present);
>  	ret |= readl_relaxed_poll_timeout(pfdev->iomem + SHADER_READY_LO,
>  		val, val == pfdev->features.shader_present, 100, 1000);
> @@ -329,7 +325,6 @@ void panfrost_gpu_power_off(struct panfrost_device *pfdev)
>  {
>  	gpu_write(pfdev, TILER_PWROFF_LO, 0);
>  	gpu_write(pfdev, SHADER_PWROFF_LO, 0);
> -	gpu_write(pfdev, STACK_PWROFF_LO, 0);
>  	gpu_write(pfdev, L2_PWROFF_LO, 0);
>  }
>  
> -- 
> 2.20.1
>
Nicolas Boichat Jan. 10, 2020, 3:30 a.m. UTC | #2
On Thu, Jan 9, 2020 at 9:44 PM Alyssa Rosenzweig
<alyssa.rosenzweig@collabora.com> wrote:
>
> A-b
>
> On Thu, Jan 09, 2020 at 01:31:04PM +0000, Steven Price wrote:
> > Explict management of the GPU's core stacks is only necessary in the
> > case of a broken integration with the PDC. Since there are no known
> > platforms which have such a broken integration let's remove the explict
> > control from the driver since this apparently causes problems on other
> > platforms and will have a small performance penality.
> >
> > The out of tree mali_kbase driver contains this text regarding
> > controlling the core stack (CONFIGMALI_CORESTACK):
> >
> >   Enabling this feature on supported GPUs will let the driver powering
> >   on/off the GPU core stack independently without involving the Power
> >   Domain Controller. This should only be enabled on platforms which
> >   integration of the PDC to the Mali GPU is known to be problematic.
> >   This feature is currently only supported on t-Six and t-HEx GPUs.
> >
> >   If unsure, say N.
> >

Work on my G-72 Bifrost, no more errors on power on!

Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>

> > Signed-off-by: Steven Price <steven.price@arm.com>
> > ---
> >  drivers/gpu/drm/panfrost/panfrost_gpu.c | 5 -----
> >  1 file changed, 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
> > index 8822ec13a0d6..460fc190de6e 100644
> > --- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
> > +++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
> > @@ -309,10 +309,6 @@ void panfrost_gpu_power_on(struct panfrost_device *pfdev)
> >       ret = readl_relaxed_poll_timeout(pfdev->iomem + L2_READY_LO,
> >               val, val == pfdev->features.l2_present, 100, 1000);
> >
> > -     gpu_write(pfdev, STACK_PWRON_LO, pfdev->features.stack_present);
> > -     ret |= readl_relaxed_poll_timeout(pfdev->iomem + STACK_READY_LO,
> > -             val, val == pfdev->features.stack_present, 100, 1000);
> > -
> >       gpu_write(pfdev, SHADER_PWRON_LO, pfdev->features.shader_present);
> >       ret |= readl_relaxed_poll_timeout(pfdev->iomem + SHADER_READY_LO,
> >               val, val == pfdev->features.shader_present, 100, 1000);
> > @@ -329,7 +325,6 @@ void panfrost_gpu_power_off(struct panfrost_device *pfdev)
> >  {
> >       gpu_write(pfdev, TILER_PWROFF_LO, 0);
> >       gpu_write(pfdev, SHADER_PWROFF_LO, 0);
> > -     gpu_write(pfdev, STACK_PWROFF_LO, 0);
> >       gpu_write(pfdev, L2_PWROFF_LO, 0);
> >  }
> >
> > --
> > 2.20.1
> >

Patch
diff mbox series

diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
index 8822ec13a0d6..460fc190de6e 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
@@ -309,10 +309,6 @@  void panfrost_gpu_power_on(struct panfrost_device *pfdev)
 	ret = readl_relaxed_poll_timeout(pfdev->iomem + L2_READY_LO,
 		val, val == pfdev->features.l2_present, 100, 1000);
 
-	gpu_write(pfdev, STACK_PWRON_LO, pfdev->features.stack_present);
-	ret |= readl_relaxed_poll_timeout(pfdev->iomem + STACK_READY_LO,
-		val, val == pfdev->features.stack_present, 100, 1000);
-
 	gpu_write(pfdev, SHADER_PWRON_LO, pfdev->features.shader_present);
 	ret |= readl_relaxed_poll_timeout(pfdev->iomem + SHADER_READY_LO,
 		val, val == pfdev->features.shader_present, 100, 1000);
@@ -329,7 +325,6 @@  void panfrost_gpu_power_off(struct panfrost_device *pfdev)
 {
 	gpu_write(pfdev, TILER_PWROFF_LO, 0);
 	gpu_write(pfdev, SHADER_PWROFF_LO, 0);
-	gpu_write(pfdev, STACK_PWROFF_LO, 0);
 	gpu_write(pfdev, L2_PWROFF_LO, 0);
 }