[Intel-gfx] [PATCH] drm/i915/skl: Tune down DC6 already enabled warning

[Patrik Jakobsson]

For unknown reasons the DMC firmware overwrites our DC5/6 bits in
the DC_STATE_EN register. This happens from time to time during the
igt at kms_flip@basic-flip-vs-dpms test. We manually fix up the register
when this occurs and so far that seems to work. This patch demotes the
warning to a debug message to not clutter our CI results.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=93697
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Patrik Jakobsson <patrik.jakobsson at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_runtime_pm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 89a7dd8..68e213c 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -574,8 +574,10 @@ static void assert_can_enable_dc6(struct drm_i915_private *dev_priv)
 	WARN_ONCE(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n");
 	WARN_ONCE(I915_READ(UTIL_PIN_CTL) & UTIL_PIN_ENABLE,
 		  "Backlight is not disabled.\n");
-	WARN_ONCE((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6),
-		  "DC6 already programmed to be enabled.\n");
+
+	/* Sometimes fw incorrectly modify our bits so just debug print this */
+	if ((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6))
+		  DRM_DEBUG_KMS("DC6 already programmed to be enabled.\n");
 
 	assert_csr_loaded(dev_priv);
 }
-- 
2.5.0