[Intel-gfx] [PATCH] drm/i915: Wait for scanout to stop when sanitizing planes

[Ville Syrjala]

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

When we sanitize planes let's wait for the scanout to stop
before we let the subsequent code tear down the ggtt mappings
and whatnot. Cures an underrun on my ivb when I boot with
VT-d enabled and the BIOS fb gets thrown out due to stolen
being considered unusable with VT-d active.

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

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index acade004e8b1..3e2c192ec708 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -2403,6 +2403,7 @@ static void intel_plane_disable_noatomic(struct intel_crtc *crtc,
 		intel_set_cpu_fifo_underrun_reporting(dev_priv, crtc->pipe, false);
 
 	intel_disable_plane(plane, crtc_state);
+	intel_wait_for_vblank(dev_priv, crtc->pipe);
 }
 
 static void
-- 
2.26.2