[Intel-gfx] [PATCH 3/3] drm/i915: Check for underruns after crtc disable

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

To get a better idea if underruns occurred during crtc disabling,
let's check for them explicitly. This helps in cases where the
error interrupt isn't active, or there is no underrun interrupt
support at all.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8a8104b7947d..21f703397f09 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13402,6 +13402,13 @@ static int intel_atomic_commit(struct drm_device *dev,
 			dev_priv->display.crtc_disable(crtc);
 			intel_crtc->active = false;
 			intel_disable_shared_dpll(intel_crtc);
+
+			/*
+			 * Underruns don't always raise
+			 * interrupts, so check manually.
+			 */
+			intel_check_cpu_fifo_underruns(dev_priv);
+			intel_check_pch_fifo_underruns(dev_priv);
 		}
 	}
 
-- 
2.4.10