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

[David Weinehall <tao@kernel.org>]

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 <lyude@redhat.com>
> Cc: David Weinehall <david.weinehall@linux.intel.com>

Tested-by: David Weinehall <david.weinehall@linux.intel.com>
Reviewed-by: David Weinehall <david.weinehall@linux.intel.com>
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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