[v3,051/105] drm/vc4: crtc: Add a delay after disabling the PixelValve output
diff mbox series

Message ID 5935e1b778ec330216a0143646746f9d3b18bfd9.1590594512.git-series.maxime@cerno.tech
State New
Headers show
  • 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 pixels getting stuck in the (unflushable) FIFO between
the HVS and the PV, we need to add some delay after disabling the PV output
and before disabling the HDMI controller. 20ms seems to be good enough so
let's use that.

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

diff mbox series

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index b3721bce7c81..dee8dc7b9409 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -401,6 +401,8 @@  static void vc4_crtc_atomic_disable(struct drm_crtc *crtc,
 	ret = wait_for(!(CRTC_READ(PV_V_CONTROL) & PV_VCONTROL_VIDEN), 1);
 	WARN_ONCE(ret, "Timeout waiting for !PV_VCONTROL_VIDEN\n");
+	mdelay(20);
 	if (vc4_encoder->post_crtc_disable)