6.6-stable review patch. If anyone has any objections, please let me know.
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From: Brigham Campbell me@brighamcampbell.com
[ Upstream commit 125459e19ec654924e472f3ff5aeea40358dbebf ]
Fix bug in nt35560_set_brightness() which causes the function to erroneously report an error. mipi_dsi_dcs_write() returns either a negative value when an error occurred or a positive number of bytes written when no error occurred. The buggy code reports an error under either condition.
Fixes: 8152c2bfd780 ("drm/panel: Add driver for Sony ACX424AKP panel") Reviewed-by: Douglas Anderson dianders@chromium.org Reviewed-by: Neil Armstrong neil.armstrong@linaro.org Signed-off-by: Brigham Campbell me@brighamcampbell.com Signed-off-by: Neil Armstrong neil.armstrong@linaro.org Link: https://lore.kernel.org/r/20250731032343.1258366-2-me@brighamcampbell.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/panel/panel-novatek-nt35560.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35560.c b/drivers/gpu/drm/panel/panel-novatek-nt35560.c index 5bbea734123bc..ee04c55175bb8 100644 --- a/drivers/gpu/drm/panel/panel-novatek-nt35560.c +++ b/drivers/gpu/drm/panel/panel-novatek-nt35560.c @@ -161,7 +161,7 @@ static int nt35560_set_brightness(struct backlight_device *bl) par = 0x00; ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, &par, 1); - if (ret) { + if (ret < 0) { dev_err(nt->dev, "failed to disable display backlight (%d)\n", ret); return ret; }