stable inclusion
from stable-v5.10.159
commit b9aca69a6c8282f1ee6ef9d8ddfa9bf0ff1b89a0
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7NTXH

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=b9aca69a6c8282f1ee6ef9d8ddfa9bf0ff1b89a0

--------------------------------

[ Upstream commit 8c115864 ]

According to the description in ti-sn65dsi86's datasheet:

CHA_HSYNC_POLARITY:
0 = Active High Pulse. Synchronization signal is high for the sync
pulse width. (default)
1 = Active Low Pulse. Synchronization signal is low for the sync
pulse width.

CHA_VSYNC_POLARITY:
0 = Active High Pulse. Synchronization signal is high for the sync
pulse width. (Default)
1 = Active Low Pulse. Synchronization signal is low for the sync
pulse width.

We should only set these bits when the polarity is negative.

Fixes: a095f15c ("drm/bridge: add support for sn65dsi86 bridge driver")
Signed-off-by: NQiqi Zhang <eddy.zhang@rock-chips.com>
Reviewed-by: NDouglas Anderson <dianders@chromium.org>
Tested-by: NDouglas Anderson <dianders@chromium.org>
Reviewed-by: NTomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: NDouglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221125104558.84616-1-eddy.zhang@rock-chips.comSigned-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: Nsanglipeng <sanglipeng1@jd.com>