This is a note to let you know that I've just added the patch titled
drm/bridge: ti-sn65dsi86: Fix output polarity setting bug
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-bridge-ti-sn65dsi86-fix-output-polarity-setting-.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5110c887061db969f1bd1a2e30b017dff0521101
Author: Qiqi Zhang <eddy.zhang@xxxxxxxxxxxxxx>
Date: Fri Nov 25 18:45:58 2022 +0800
drm/bridge: ti-sn65dsi86: Fix output polarity setting bug
[ Upstream commit 8c115864501fc09932cdfec53d9ec1cde82b4a28 ]
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: a095f15c00e2 ("drm/bridge: add support for sn65dsi86 bridge driver")
Signed-off-by: Qiqi Zhang <eddy.zhang@xxxxxxxxxxxxxx>
Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Tested-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20221125104558.84616-1-eddy.zhang@xxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 45a5f1e48f0e..bbedce0eedda 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -920,9 +920,9 @@ static void ti_sn_bridge_set_video_timings(struct ti_sn65dsi86 *pdata)
&pdata->bridge.encoder->crtc->state->adjusted_mode;
u8 hsync_polarity = 0, vsync_polarity = 0;
- if (mode->flags & DRM_MODE_FLAG_PHSYNC)
+ if (mode->flags & DRM_MODE_FLAG_NHSYNC)
hsync_polarity = CHA_HSYNC_POLARITY;
- if (mode->flags & DRM_MODE_FLAG_PVSYNC)
+ if (mode->flags & DRM_MODE_FLAG_NVSYNC)
vsync_polarity = CHA_VSYNC_POLARITY;
ti_sn65dsi86_write_u16(pdata, SN_CHA_ACTIVE_LINE_LENGTH_LOW_REG,
