[Intel-gfx] [PATCH 16/16] drm/i915: add comments on what stage a given PM handler is called

[Ville Syrjälä]

On Wed, Sep 10, 2014 at 06:17:09PM +0300, Imre Deak wrote:
> This will hopefully make it easier to navigate the code without the need
> to consult the full PM documentation.
> 
> Signed-off-by: Imre Deak <imre.deak at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 55b04e6..44c9317 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1506,10 +1506,21 @@ static int intel_resume_prepare(struct drm_i915_private *dev_priv,
>  }
>  
>  static const struct dev_pm_ops i915_pm_ops = {
> +	/* S0ix, S3 event handlers */

Well, S0ix can occur in due to runtime PM as well.

>  	.suspend = i915_pm_suspend,
>  	.suspend_late = i915_pm_suspend_late,
>  	.resume_early = i915_pm_resume_early,
>  	.resume = i915_pm_resume,
> +
> +	/*
> +	 * S4 event handlers
> +	 * @freeze, @freeze_late    : called before creating hibernation image

That's FREEZE. Also called before restoring the hibenation image (QUIESCE).

> +	 * @thaw, @thaw_early       : called after creating hibernation image,
> +	 *                            before writing it

That's THAW. Also called after failing the snapshot or restore (RECOVER).

> +	 * @poweroff, @poweroff_late: called after writing hibernation image,
> +	 *                            before rebooting
> +	 * @restore, @restore_early : called after rebooting

"after restoring the hibernation image" is what I'd say. That's RESTORE.

> +	 */
>  	.freeze = i915_pm_suspend,
>  	.freeze_late = i915_pm_suspend_late,
>  	.thaw_early = i915_pm_resume_early,
> @@ -1518,6 +1529,8 @@ static const struct dev_pm_ops i915_pm_ops = {
>  	.poweroff_late = i915_pm_suspend_late,
>  	.restore_early = i915_pm_resume_early,
>  	.restore = i915_pm_resume,
> +
> +	/* D0<->D3 (runtime PM) event handlers */
>  	.runtime_suspend = intel_runtime_suspend,
>  	.runtime_resume = intel_runtime_resume,
>  };
> -- 
> 1.8.4
> 
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-- 
Ville Syrjälä
Intel OTC