From 6a7bd6cde73f0fb7e5faa964dbdeb45b55c64698 Mon Sep 17 00:00:00 2001
From: Douglas Anderson <dianders@chromium.org>
Date: Fri, 17 May 2024 14:36:40 -0700
Subject: [PATCH] drm/panel: ilitek-ili9882t: Check for errors on the NOP in
prepare()
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@chromium.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240517143643.5.I323476ba9fa8cc7a5adee4c1ec95202785cc5686@changeid
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240517143643.5.I323476ba9fa8cc7a5adee4c1ec95202785cc5686@changeid
---
drivers/gpu/drm/panel/panel-ilitek-ili9882t.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c b/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c
index a2ea25bb66246..266a087fe14c1 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c
@@ -478,7 +478,11 @@ 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);
--
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