drm/i915: Check for underruns after crtc disable

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@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448050160-14124-3-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 9c8718366cc2..3df22f0c84df 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);
                 }
         }