[PATCH 2/2] drm/i915: Also call frontbuffer flip when disabling planes.

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

We also need to call the frontbuffer flip to trigger proper
invalidations when disabling planes. Otherwise we will miss
screen updates when disabling sprites or cursor.

It was caught with kms_psr_sink_crc sprite_plane_onoff
and cursor_plane_onoff subtests.

This is probably a regression since I can also get this
with the manual test case, but with so many changes on atomic
modeset I couldn't track exactly when this was introduced.

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index af0bcfe..bb124cc 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11716,7 +11716,7 @@ int intel_plane_atomic_calc_changes(struct drm_crtc_state *crtc_state,
 		intel_crtc->atomic.update_wm_pre = true;
 	}
 
-	if (visible)
+	if (visible || was_visible)
 		intel_crtc->atomic.fb_bits |=
 			to_intel_plane(plane)->frontbuffer_bit;
 
-- 
1.9.3

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