This is a note to let you know that I've just added the patch titled
drm/panel: ilitek-ili9882t: Check for errors on the NOP in prepare()
to the 6.10-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-panel-ilitek-ili9882t-check-for-errors-on-the-no.patch
and it can be found in the queue-6.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 77aea8a79ab84139f19beaa6b75df1271d6d17f1
Author: Douglas Anderson <dianders@xxxxxxxxxxxx>
Date: Fri May 17 14:36:40 2024 -0700
drm/panel: ilitek-ili9882t: Check for errors on the NOP in prepare()
[ Upstream commit 6a7bd6cde73f0fb7e5faa964dbdeb45b55c64698 ]
The mipi_dsi_dcs_nop() function returns an error but we weren't
checking it in ili9882t_prepare(). Add a check. This is highly
unlikely to matter in practice. If the NOP failed then likely later
MIPI commands would fail too.
Found by code inspection.
Fixes: e2450d32e5fb ("drm/panel: ili9882t: Break out as separate driver")
Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240517143643.5.I323476ba9fa8cc7a5adee4c1ec95202785cc5686@changeid
Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240517143643.5.I323476ba9fa8cc7a5adee4c1ec95202785cc5686@changeid
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c b/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c
index 5762eba73955c..35ea5494e0eb8 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c
@@ -560,7 +560,11 @@ static int ili9882t_prepare(struct drm_panel *panel)
usleep_range(10000, 11000);
// MIPI needs to keep the LP11 state before the lcm_reset pin is pulled high
- mipi_dsi_dcs_nop(ili->dsi);
+ ret = mipi_dsi_dcs_nop(ili->dsi);
+ if (ret < 0) {
+ dev_err(&ili->dsi->dev, "Failed to send NOP: %d\n", ret);
+ goto poweroff;
+ }
usleep_range(1000, 2000);
gpiod_set_value(ili->enable_gpio, 1);
