Re: [Intel-gfx] [PATCH 2/2] drm/i915: Reinit polling before hpd when resuming

[David Weinehall]

On Thu, Nov 03, 2016 at 11:42:38AM -0400, Lyude wrote:
> Now that we don't run the connector reprobing from i915_drm_resume(), we
> need to make it so we don't have to wait for reprobing to finish so that
> we actually speed things up. In order to do this, we need to make sure
> that i915_drm_resume() doesn't get blocked by i915_hpd_poll_init_work()
> while trying to acquire the mode_config lock that
> drm_kms_helper_poll_enable() needs to acquire.
> 
> The easiest way to do this is to just enable polling before hpd. This
> shouldn't break anything since at that point we have everything else we
> need for polling enabled.
> 
> As well, this should result in a rather significant improvement in how
> quickly we can resume the system.
> 
> Signed-off-by: Lyude 
> Cc: David Weinehall 

Tested-by: David Weinehall 
Reviewed-by: David Weinehall 
Testcase: analyze_suspend.py -config config/suspend-callgraph.cfg -filter i915

> ---
>  drivers/gpu/drm/i915/i915_drv.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 532cc0f..f605dde 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1595,6 +1595,8 @@ static int i915_drm_resume(struct drm_device *dev)
>  
>   intel_display_resume(dev);
>  
> + drm_kms_helper_poll_enable(dev);
> +
>   /*
>* ... but also need to make sure that hotplug processing
>* doesn't cause havoc. Like in the driver load code we don't
> @@ -1614,7 +1616,6 @@ static int i915_drm_resume(struct drm_device *dev)
>   intel_opregion_notify_adapter(dev_priv, PCI_D0);
>  
>   intel_autoenable_gt_powersave(dev_priv);
> - drm_kms_helper_poll_enable(dev);
>  
>   enable_rpm_wakeref_asserts(dev_priv);
>  
> -- 
> 2.7.4
> 
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[Intel-gfx] [PATCH 2/2] drm/i915: Reinit polling before hpd when resuming

[Lyude]

Now that we don't run the connector reprobing from i915_drm_resume(), we
need to make it so we don't have to wait for reprobing to finish so that
we actually speed things up. In order to do this, we need to make sure
that i915_drm_resume() doesn't get blocked by i915_hpd_poll_init_work()
while trying to acquire the mode_config lock that
drm_kms_helper_poll_enable() needs to acquire.

The easiest way to do this is to just enable polling before hpd. This
shouldn't break anything since at that point we have everything else we
need for polling enabled.

As well, this should result in a rather significant improvement in how
quickly we can resume the system.

Signed-off-by: Lyude 
Cc: David Weinehall 
---
 drivers/gpu/drm/i915/i915_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 532cc0f..f605dde 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1595,6 +1595,8 @@ static int i915_drm_resume(struct drm_device *dev)
 
intel_display_resume(dev);
 
+   drm_kms_helper_poll_enable(dev);
+
/*
 * ... but also need to make sure that hotplug processing
 * doesn't cause havoc. Like in the driver load code we don't
@@ -1614,7 +1616,6 @@ static int i915_drm_resume(struct drm_device *dev)
intel_opregion_notify_adapter(dev_priv, PCI_D0);
 
intel_autoenable_gt_powersave(dev_priv);
-   drm_kms_helper_poll_enable(dev);
 
enable_rpm_wakeref_asserts(dev_priv);
 
-- 
2.7.4

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