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drm/i915: Fix mismatched INIT power domain disabling during suspend

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Currently the display INIT power domain disabling/enabling happens in a
mismatched way in the suspend/resume_early hooks respectively. This can
leave display power wells incorrectly disabled in the resume hook if the
suspend sequence is aborted for some reason resulting in the
suspend/resume hooks getting called but the suspend_late/resume_early
hooks being skipped. In particular this change fixes "Unclaimed read
from register 0x1e1204" on BYT/BSW triggered from i915_drm_resume()->
intel_pps_unlock_regs_wa() when suspending with /sys/power/pm_test set
to devices.

Fixes: 85e9067933 ("drm/i915: disable power wells on suspend")
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: David Weinehall <david.weinehall@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1476358446-11621-1-git-send-email-imre.deak@intel.com
(cherry picked from commit 4c494a5769)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Imre Deak 2016-10-13 14:34:06 +03:00 committed by Jani Nikula
parent be4dd651ff
commit fd58753ead
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/i915_drv.c
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@ -1447,8 +1447,6 @@ static int i915_drm_suspend(struct drm_device *dev)
dev_priv->suspend_count++;
intel_display_set_init_power(dev_priv, false);
intel_csr_ucode_suspend(dev_priv);
out:
@ -1466,6 +1464,8 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation)
disable_rpm_wakeref_asserts(dev_priv);
intel_display_set_init_power(dev_priv, false);
fw_csr = !IS_BROXTON(dev_priv) &&
suspend_to_idle(dev_priv) && dev_priv->csr.dmc_payload;
/*