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drm/i915: Unlock PPS registers after GPU reset 

Reapply the PPS register unlock workaround after GPU reset on platforms
where the reset clobbers the display HW state. This at least gets rid of
the related WARN during LVDS encoder enabling on PNV.

Fixes: ed6143b8f7 ("drm/i915/lvds: Restore initial HW state during encoder enabling")
Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1473847453-4771-1-git-send-email-imre.deak@intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
This commit is contained in:
Imre Deak 2016-09-14 13:04:13 +03:00
parent e29aff05f2
commit 51f592050a
1 changed files with 1 additions and 0 deletions
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1
drivers/gpu/drm/i915/intel_display.c
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@ -3627,6 +3627,7 @@ void intel_finish_reset(struct drm_i915_private *dev_priv)
intel_runtime_pm_disable_interrupts(dev_priv);
intel_runtime_pm_enable_interrupts(dev_priv);
intel_pps_unlock_regs_wa(dev_priv);
intel_modeset_init_hw(dev);
spin_lock_irq(&dev_priv->irq_lock);