From: Tilak Tangudu <tilak.tangudu@xxxxxxxxx>
During runtime resume the display init sequence is called via
intel_display_power_resume() -> icl_display_core_init()
which should restore the display HW state. For restoring the DC9 enabled
state in DC_STATE_EN, gen9_sanitize_dc_state() should be called on the
runtime resume path too to avoid the
[ 513.818190] i915 0000:03:00.0: [drm] *ERROR DC state mismatch (0x8 -> 0x0)*
Signed-off-by: Tilak Tangudu <tilak.tangudu@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_display_power.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index 589af257edeb..799f84d3eed6 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -2229,6 +2229,7 @@ void intel_display_power_suspend(struct drm_i915_private *i915)
void intel_display_power_resume(struct drm_i915_private *i915)
{
if (DISPLAY_VER(i915) >= 11) {
+ gen9_sanitize_dc_state(i915);
bxt_disable_dc9(i915);
icl_display_core_init(i915, true);
if (intel_dmc_has_payload(i915)) {
--
2.25.1
