drm/i915: Add distinct stubs for PM hibernation phases

Currently for handling the extra hibernation phases we just call the
equivalent suspend/resume phases. In the next couple of patches, I wish
to specialise the hibernation phases to reduce the amount of work
required for handling GEM objects.

v2: There are more! Don't forget the freeze phases.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Imre Deak <imre.deak@intel.com>
Cc: David Weinehall <david.weinehall@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1463207195-22076-1-git-send-email-chris@chris-wilson.co.uk

1 files changed, 39 insertions, 6 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 198f79369003..816cacddbe88 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1115,6 +1115,39 @@ static int i915_pm_resume(struct device *dev)
         return i915_drm_resume(drm_dev);
 }
 
+/* freeze: before creating the hibernation_image */
+static int i915_pm_freeze(struct device *dev)
+{
+        return i915_pm_suspend(dev);
+}
+
+static int i915_pm_freeze_late(struct device *dev)
+{
+        return i915_pm_suspend_late(dev);
+}
+
+/* thaw: called after creating the hibernation image, but before turning off. */
+static int i915_pm_thaw_early(struct device *dev)
+{
+        return i915_pm_resume_early(dev);
+}
+
+static int i915_pm_thaw(struct device *dev)
+{
+        return i915_pm_resume(dev);
+}
+
+/* restore: called after loading the hibernation image. */
+static int i915_pm_restore_early(struct device *dev)
+{
+        return i915_pm_resume_early(dev);
+}
+
+static int i915_pm_restore(struct device *dev)
+{
+        return i915_pm_resume(dev);
+}
+
 /*
  * Save all Gunit registers that may be lost after a D3 and a subsequent
  * S0i[R123] transition. The list of registers needing a save/restore is
@@ -1669,14 +1702,14 @@ static const struct dev_pm_ops i915_pm_ops = {
          * @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,
-        .thaw = i915_pm_resume,
+        .freeze = i915_pm_freeze,
+        .freeze_late = i915_pm_freeze_late,
+        .thaw_early = i915_pm_thaw_early,
+        .thaw = i915_pm_thaw,
         .poweroff = i915_pm_suspend,
         .poweroff_late = i915_pm_poweroff_late,
-        .restore_early = i915_pm_resume_early,
-        .restore = i915_pm_resume,
+        .restore_early = i915_pm_restore_early,
+        .restore = i915_pm_restore,
 
         /* S0ix (via runtime suspend) event handlers */
         .runtime_suspend = intel_runtime_suspend,