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Subject[PATCH v5 24/80] drm/vc4: hvs: Make sure our channel is reset
Date
In order to clear our intermediate FIFOs that might end up with a stale
pixel, let's make sure our FIFO channel is reset every time our channel is
setup.

Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
drivers/gpu/drm/vc4/vc4_hvs.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
index efaae60bb323..0f56a7b57916 100644
--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -205,6 +205,10 @@ static int vc4_hvs_init_channel(struct vc4_dev *vc4, struct drm_crtc *crtc,
u32 dispbkgndx;
u32 dispctrl;

+ HVS_WRITE(SCALER_DISPCTRLX(chan), 0);
+ HVS_WRITE(SCALER_DISPCTRLX(chan), SCALER_DISPCTRLX_RESET);
+ HVS_WRITE(SCALER_DISPCTRLX(chan), 0);
+
/* Turn on the scaler, which will wait for vstart to start
* compositing.
* When feeding the transposer, we should operate in oneshot
--
git-series 0.9.1
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