[PATCH 4/9] drm/i915: sanitize dc state in rpm resume

[Anshuman Gupta]

From: Tilak Tangudu <tilak.tangudu at intel.com>

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 at intel.com>
---
 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 3f84af6beff3..b7c7a5e4ba25 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -2240,6 +2240,7 @@ 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)) {
-- 
2.26.2