[Intel-gfx] [PATCH 06/19] drm/i915: do adapter power state notification at runtime PM

[Rodrigo Vivi]

Reviewed-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>

On Wed, Nov 27, 2013 at 06:13:44PM -0200, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
> 
> Now that we are actually setting the device to the D3 state, we should
> issue the notification.
> 
> The opregion spec says we should send the message before the adapter
> is about to be placed in a lower power state, and after the adapter is
> placed in a higher power state.
> 
> Jani originally wrote a similar patch for PC8, but then we discovered
> that we were not really changing the PCI D states when
> enabling/disabling PC8, so we had to postpone his patch.
> 
> v2: - Improve commit message, explaining the expected state.
> 
> Cc: Jani Nikula <jani.nikula at intel.com>
> Credits-to: Jani Nikula <jani.nikula at intel.com>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index d5310a0..6b92929 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -918,6 +918,7 @@ static int i915_runtime_suspend(struct device *device)
>  
>  	dev_priv->pm.suspended = true;
>  
> +	intel_opregion_notify_adapter(dev, PCI_D3cold);
>  	pci_save_state(pdev);
>  	pci_set_power_state(pdev, PCI_D3cold);
>  
> @@ -936,6 +937,7 @@ static int i915_runtime_resume(struct device *device)
>  
>  	pci_set_power_state(pdev, PCI_D0);
>  	pci_restore_state(pdev);
> +	intel_opregion_notify_adapter(dev, PCI_D0);
>  
>  	dev_priv->pm.suspended = false;
>  
> -- 
> 1.8.3.1
> 
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