Re: [PATCH v4 31/78] drm/vc4: crtc: Clear the PixelValve FIFO during configuration
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: 2020-07-28 11:42:21
Also in:
dri-devel, lkml
Hi Maxime On Wed, 8 Jul 2020 at 18:43, Maxime Ripard [off-list ref] wrote:
Even though it's not really clear why we need to flush the PV FIFO during the configuration even though we started by flushing it, experience shows that without it we get a stale pixel stuck in the FIFO between the HVS and the PV. Signed-off-by: Maxime Ripard <redacted>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
quoted hunk ↗ jump to hunk
--- drivers/gpu/drm/vc4/vc4_crtc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c index 13fe0e370fb3..25a77cd46b28 100644 --- a/drivers/gpu/drm/vc4/vc4_crtc.c +++ b/drivers/gpu/drm/vc4/vc4_crtc.c@@ -358,7 +358,7 @@ static void vc4_crtc_config_pv(struct drm_crtc *crtc) if (is_dsi) CRTC_WRITE(PV_HACT_ACT, mode->hdisplay * pixel_rep); - CRTC_WRITE(PV_CONTROL, + CRTC_WRITE(PV_CONTROL, PV_CONTROL_FIFO_CLR | vc4_crtc_get_fifo_full_level_bits(vc4_crtc, format) | VC4_SET_FIELD(format, PV_CONTROL_FORMAT) | VC4_SET_FIELD(pixel_rep - 1, PV_CONTROL_PIXEL_REP) | --git-series 0.9.1
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