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: ed6143b8f75 ("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>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 69b80d0..18fdbb7 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -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);