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* [v1] drm/msm: Remove clock and bandwidth votes in mdss pm suspend
@ 2019-01-23 11:12 ` Jayant Shekhar
  0 siblings, 0 replies; 4+ messages in thread
From: Jayant Shekhar @ 2019-01-23 11:12 UTC (permalink / raw)
  To: dri-devel, linux-arm-msm, freedreno, devicetree
  Cc: linux-kernel, abhinavk, Jayant Shekhar, seanpaul, hoegsberg, chandanu

MDSS PM suspend is dependent on runtime suspend for disabling
clocks and removing bandwidth votes. In case of pm_suspend
triggered, dpm_prepare hold a refcount on power usage of device
and hence runtime suspend is never triggered during pm_suspend.
As runtime suspend is not triggered, clocks and bandwidth votes
remain. Hence explicitly trigger mdss disable in msm_pm_suspend
to disable clocks and remove the votes.

Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>
---
 drivers/gpu/drm/msm/msm_drv.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 5c60bb3..ffe3a25 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -1068,12 +1068,16 @@ static int msm_pm_suspend(struct device *dev)
 {
 	struct drm_device *ddev = dev_get_drvdata(dev);
 	struct msm_drm_private *priv = ddev->dev_private;
+	struct msm_mdss *mdss = priv->mdss;
 
 	if (!IS_ERR_OR_NULL(priv->pm_state))
 		return 0;
 
 	priv->pm_state = drm_atomic_helper_suspend(ddev);
 
+	if (mdss && mdss->funcs)
+		mdss->funcs->disable(mdss);
+
 	return IS_ERR(priv->pm_state) ? PTR_ERR(priv->pm_state) : 0;
 }
 
@@ -1081,11 +1085,15 @@ static int msm_pm_resume(struct device *dev)
 {
 	struct drm_device *ddev = dev_get_drvdata(dev);
 	struct msm_drm_private *priv = ddev->dev_private;
+	struct msm_mdss *mdss = priv->mdss;
 	int ret;
 
 	if (IS_ERR_OR_NULL(priv->pm_state))
 		return 0;
 
+	if (mdss && mdss->funcs)
+		mdss->funcs->enable(mdss);
+
 	ret = drm_atomic_helper_resume(ddev, priv->pm_state);
 	if (ret == 0)
 		priv->pm_state = NULL;
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

^ permalink raw reply related	[flat|nested] 4+ messages in thread
* [v1] drm/msm: Remove clock and bandwidth votes in mdss pm suspend
@ 2019-01-23 11:12 ` Jayant Shekhar
  0 siblings, 0 replies; 4+ messages in thread
From: Jayant Shekhar @ 2019-01-23 11:12 UTC (permalink / raw)
  To: dri-devel, linux-arm-msm, freedreno, devicetree
  Cc: Jayant Shekhar, linux-kernel, robdclark, seanpaul, hoegsberg,
	abhinavk, jsanka, chandanu, nganji

MDSS PM suspend is dependent on runtime suspend for disabling
clocks and removing bandwidth votes. In case of pm_suspend
triggered, dpm_prepare hold a refcount on power usage of device
and hence runtime suspend is never triggered during pm_suspend.
As runtime suspend is not triggered, clocks and bandwidth votes
remain. Hence explicitly trigger mdss disable in msm_pm_suspend
to disable clocks and remove the votes.

Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>
---
 drivers/gpu/drm/msm/msm_drv.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 5c60bb3..ffe3a25 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -1068,12 +1068,16 @@ static int msm_pm_suspend(struct device *dev)
 {
 	struct drm_device *ddev = dev_get_drvdata(dev);
 	struct msm_drm_private *priv = ddev->dev_private;
+	struct msm_mdss *mdss = priv->mdss;
 
 	if (!IS_ERR_OR_NULL(priv->pm_state))
 		return 0;
 
 	priv->pm_state = drm_atomic_helper_suspend(ddev);
 
+	if (mdss && mdss->funcs)
+		mdss->funcs->disable(mdss);
+
 	return IS_ERR(priv->pm_state) ? PTR_ERR(priv->pm_state) : 0;
 }
 
@@ -1081,11 +1085,15 @@ static int msm_pm_resume(struct device *dev)
 {
 	struct drm_device *ddev = dev_get_drvdata(dev);
 	struct msm_drm_private *priv = ddev->dev_private;
+	struct msm_mdss *mdss = priv->mdss;
 	int ret;
 
 	if (IS_ERR_OR_NULL(priv->pm_state))
 		return 0;
 
+	if (mdss && mdss->funcs)
+		mdss->funcs->enable(mdss);
+
 	ret = drm_atomic_helper_resume(ddev, priv->pm_state);
 	if (ret == 0)
 		priv->pm_state = NULL;
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


^ permalink raw reply related	[flat|nested] 4+ messages in thread
* Re: [v1] drm/msm: Remove clock and bandwidth votes in mdss pm suspend
  2019-01-23 11:12 ` Jayant Shekhar
@ 2019-02-17 17:40     ` Rob Clark
  -1 siblings, 0 replies; 4+ messages in thread
From: Rob Clark @ 2019-02-17 17:40 UTC (permalink / raw)
  To: Jayant Shekhar
  Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, linux-arm-msm,
	Linux Kernel Mailing List, dri-devel,
	nganji-sgV2jX0FEOL9JmXXK+q4OQ, Sean Paul, Abhinav Kumar,
	Kristian H. Kristensen, freedreno, Jeykumar Sankaran,
	chandanu-sgV2jX0FEOL9JmXXK+q4OQ

On Wed, Jan 23, 2019 at 6:12 AM Jayant Shekhar <jshekhar@codeaurora.org> wrote:
>
> MDSS PM suspend is dependent on runtime suspend for disabling
> clocks and removing bandwidth votes. In case of pm_suspend
> triggered, dpm_prepare hold a refcount on power usage of device
> and hence runtime suspend is never triggered during pm_suspend.
> As runtime suspend is not triggered, clocks and bandwidth votes
> remain. Hence explicitly trigger mdss disable in msm_pm_suspend
> to disable clocks and remove the votes.
>
> Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>
> ---
>  drivers/gpu/drm/msm/msm_drv.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 5c60bb3..ffe3a25 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -1068,12 +1068,16 @@ static int msm_pm_suspend(struct device *dev)
>  {
>         struct drm_device *ddev = dev_get_drvdata(dev);
>         struct msm_drm_private *priv = ddev->dev_private;
> +       struct msm_mdss *mdss = priv->mdss;
>
>         if (!IS_ERR_OR_NULL(priv->pm_state))
>                 return 0;
>
>         priv->pm_state = drm_atomic_helper_suspend(ddev);
>
> +       if (mdss && mdss->funcs)
> +               mdss->funcs->disable(mdss);
> +

This patch doesn't actually seem to apply, I guess it has a dependency
on some other missing patch?

That said, shouldn't the refcount aquired in _prepare() be dropped
somewhere?  It seems like if all planes/crtcs/etc are disabled, we
should also disable power (or at least as much as we can while still
having hotplug work), so ideally drm_atomic_helper_suspend() should be
enough.

BR.
-R

>         return IS_ERR(priv->pm_state) ? PTR_ERR(priv->pm_state) : 0;
>  }
>
> @@ -1081,11 +1085,15 @@ static int msm_pm_resume(struct device *dev)
>  {
>         struct drm_device *ddev = dev_get_drvdata(dev);
>         struct msm_drm_private *priv = ddev->dev_private;
> +       struct msm_mdss *mdss = priv->mdss;
>         int ret;
>
>         if (IS_ERR_OR_NULL(priv->pm_state))
>                 return 0;
>
> +       if (mdss && mdss->funcs)
> +               mdss->funcs->enable(mdss);
> +
>         ret = drm_atomic_helper_resume(ddev, priv->pm_state);
>         if (ret == 0)
>                 priv->pm_state = NULL;
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
_______________________________________________
Freedreno mailing list
Freedreno@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/freedreno

^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: [v1] drm/msm: Remove clock and bandwidth votes in mdss pm suspend
@ 2019-02-17 17:40     ` Rob Clark
  0 siblings, 0 replies; 4+ messages in thread
From: Rob Clark @ 2019-02-17 17:40 UTC (permalink / raw)
  To: Jayant Shekhar
  Cc: dri-devel, linux-arm-msm, freedreno, devicetree,
	Linux Kernel Mailing List, Sean Paul, Kristian H. Kristensen,
	Abhinav Kumar, Jeykumar Sankaran, chandanu, nganji

On Wed, Jan 23, 2019 at 6:12 AM Jayant Shekhar <jshekhar@codeaurora.org> wrote:
>
> MDSS PM suspend is dependent on runtime suspend for disabling
> clocks and removing bandwidth votes. In case of pm_suspend
> triggered, dpm_prepare hold a refcount on power usage of device
> and hence runtime suspend is never triggered during pm_suspend.
> As runtime suspend is not triggered, clocks and bandwidth votes
> remain. Hence explicitly trigger mdss disable in msm_pm_suspend
> to disable clocks and remove the votes.
>
> Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>
> ---
>  drivers/gpu/drm/msm/msm_drv.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 5c60bb3..ffe3a25 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -1068,12 +1068,16 @@ static int msm_pm_suspend(struct device *dev)
>  {
>         struct drm_device *ddev = dev_get_drvdata(dev);
>         struct msm_drm_private *priv = ddev->dev_private;
> +       struct msm_mdss *mdss = priv->mdss;
>
>         if (!IS_ERR_OR_NULL(priv->pm_state))
>                 return 0;
>
>         priv->pm_state = drm_atomic_helper_suspend(ddev);
>
> +       if (mdss && mdss->funcs)
> +               mdss->funcs->disable(mdss);
> +

This patch doesn't actually seem to apply, I guess it has a dependency
on some other missing patch?

That said, shouldn't the refcount aquired in _prepare() be dropped
somewhere?  It seems like if all planes/crtcs/etc are disabled, we
should also disable power (or at least as much as we can while still
having hotplug work), so ideally drm_atomic_helper_suspend() should be
enough.

BR.
-R

>         return IS_ERR(priv->pm_state) ? PTR_ERR(priv->pm_state) : 0;
>  }
>
> @@ -1081,11 +1085,15 @@ static int msm_pm_resume(struct device *dev)
>  {
>         struct drm_device *ddev = dev_get_drvdata(dev);
>         struct msm_drm_private *priv = ddev->dev_private;
> +       struct msm_mdss *mdss = priv->mdss;
>         int ret;
>
>         if (IS_ERR_OR_NULL(priv->pm_state))
>                 return 0;
>
> +       if (mdss && mdss->funcs)
> +               mdss->funcs->enable(mdss);
> +
>         ret = drm_atomic_helper_resume(ddev, priv->pm_state);
>         if (ret == 0)
>                 priv->pm_state = NULL;
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>

^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2019-02-17 17:40 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2019-01-23 11:12 [v1] drm/msm: Remove clock and bandwidth votes in mdss pm suspend Jayant Shekhar
2019-01-23 11:12 ` Jayant Shekhar
     [not found] ` <1548241960-7412-1-git-send-email-jshekhar-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2019-02-17 17:40   ` Rob Clark
2019-02-17 17:40     ` Rob Clark

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