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drm/i915: add comments on what stage a given PM handler is called

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This will hopefully make it easier to navigate the code without the need
to consult the full PM documentation.

v2:
- add a comment that the freeze handler is also called after rebooting
- add a comment that the thaw handler is also called to recover from
  errors (Ville)
- add the PM event names (PMSG_THAW etc.) for reference (Ville)
- add comments that s0ix can be handled both via system and runtime
  suspend (Ville)

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Imre Deak 2014-10-23 19:23:28 +03:00 committed by Daniel Vetter
parent fc49b3da0e
commit 5545dbbfb3
1 changed files with 22 additions and 0 deletions
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22
drivers/gpu/drm/i915/i915_drv.c
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@ -1534,10 +1534,30 @@ static int intel_resume_prepare(struct drm_i915_private *dev_priv,
}
static const struct dev_pm_ops i915_pm_ops = {
/*
* S0ix (via system suspend) and S3 event handlers [PMSG_SUSPEND,
* PMSG_RESUME]
*/
.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 (1) before creating the
* hibernation image [PMSG_FREEZE] and
* (2) after rebooting, before restoring
* the image [PMSG_QUIESCE]
* @thaw, @thaw_early : called (1) after creating the hibernation
* image, before writing it [PMSG_THAW]
* and (2) after failing to create or
* restore the image [PMSG_RECOVER]
* @poweroff, @poweroff_late: called after writing the hibernation
* image, before rebooting [PMSG_HIBERNATE]
* @restore, @restore_early : called after rebooting and restoring the
* hibernation image [PMSG_RESTORE]
*/
.freeze = i915_pm_suspend,
.freeze_late = i915_pm_suspend_late,
.thaw_early = i915_pm_resume_early,
@ -1546,6 +1566,8 @@ 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,
/* S0ix (via runtime suspend) event handlers */
.runtime_suspend = intel_runtime_suspend,
.runtime_resume = intel_runtime_resume,
};