[v3,052/105] drm/vc4: crtc: Clear the PixelValve FIFO on disable
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Message ID 9153ce3f0281d57de817a3c8ea0f12530212808b.1590594512.git-series.maxime@cerno.tech
State New
Headers show
Series
  • drm/vc4: Support BCM2711 Display Pipeline
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Commit Message

Maxime Ripard May 27, 2020, 3:48 p.m. UTC
In order to avoid a stale pixel getting stuck on mode change or a disable
/ enable cycle, we need to make sure to flush the PV FIFO on disable.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_crtc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Patch
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diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index dee8dc7b9409..61e0945a8697 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -406,8 +406,7 @@  static void vc4_crtc_atomic_disable(struct drm_crtc *crtc,
 	if (vc4_encoder->post_crtc_disable)
 		vc4_encoder->post_crtc_disable(encoder);
 
-	CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) & ~PV_CONTROL_EN);
-
+	vc4_crtc_pixelvalve_reset(crtc);
 	vc4_hvs_atomic_disable(crtc, old_state);
 
 	if (vc4_encoder->post_crtc_powerdown)