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drm/i915: vlv: fix gunit HW state corruption during S4 suspend 

During S4 freeze we don't call intel_suspend_complete(), which would
save the gunit HW state, but during S4 thaw/restore events we call
intel_resume_prepare() which restores it, thus ending up in a corrupted
HW state.

Fix this by calling intel_suspend_complete() from the corresponding
freeze_late event handler.

The issue was introduced in
commit 016970beb0
Author: Sagar Kamble <sagar.a.kamble@intel.com>
Date:   Wed Aug 13 23:07:06 2014 +0530

CC: Sagar Kamble <sagar.a.kamble@intel.com>
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>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Imre Deak 2014-09-10 18:16:54 +03:00 committed by Jani Nikula
parent d6a8b72edc
commit a024d2e6f1
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/i915/i915_drv.c
View File

@ -986,6 +986,15 @@ static int i915_pm_freeze(struct device *dev)
return i915_drm_freeze(drm_dev);
}
static int i915_pm_freeze_late(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct drm_device *drm_dev = pci_get_drvdata(pdev);
struct drm_i915_private *dev_priv = drm_dev->dev_private;
return intel_suspend_complete(dev_priv);
}
static int i915_pm_thaw_early(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
@ -1570,6 +1579,7 @@ static const struct dev_pm_ops i915_pm_ops = {
.resume_early = i915_pm_resume_early,
.resume = 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_poweroff,