On Wed, Sep 10, 2014 at 06:16:54PM +0300, Imre Deak wrote:
> 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 016970beb05da6285c2f3ed2bee1c676cb75972e
> Author: Sagar Kamble <sagar.a.kamble@xxxxxxxxx>
> Date: Wed Aug 13 23:07:06 2014 +0530
>
> CC: Sagar Kamble <sagar.a.kamble@xxxxxxxxx>
> Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Yep, pairs up with .thaw_early()/.restore_early(), which should take
care of all the valid combinations of pm events.
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index b8bd008..2365875 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -987,6 +987,15 @@ 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);
> @@ -1571,6 +1580,7 @@ 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,
> --
> 1.8.4
>
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--
Ville Syrjälä
Intel OTC
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