iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm/vc4: txp: Don't set TXP_VSTART_AT_EOF

Browse Source 
[ Upstream commit 234998df929f14d00cbf2f1e81a7facb69fd9266 ]

The TXP_VSTART_AT_EOF will generate a second VSTART signal to the HVS.
However, the HVS waits for VSTART to enable the FIFO and will thus start
filling the FIFO before the start of the frame.

This leads to corruption at the beginning of the first frame, and
content from the previous frame at the beginning of the next frames.

Since one VSTART is enough, let's get rid of it.

Fixes: 008095e065a8 ("drm/vc4: Add support for the transposer block")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://lore.kernel.org/r/20220328153659.2382206-3-maxime@cerno.tech
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maxime Ripard 2022-03-28 17:36:55 +02:00 committed by Greg Kroah-Hartman
parent 15cec7dfd3
commit ac904216b8
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/vc4/vc4_txp.c
View File

@ -295,7 +295,7 @@ static void vc4_txp_connector_atomic_commit(struct drm_connector *conn,
if (WARN_ON(i == ARRAY_SIZE(drm_fmts)))
return;
ctrl = TXP_GO | TXP_VSTART_AT_EOF | TXP_EI |
ctrl = TXP_GO | TXP_EI |
VC4_SET_FIELD(0xf, TXP_BYTE_ENABLE) |
VC4_SET_FIELD(txp_fmts[i], TXP_FORMAT);