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drm/panel: novatek-nt35560: Fix invalid return value

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[ 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: 8152c2bfd7 ("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>
This commit is contained in:
Brigham Campbell 2025-07-30 21:23:41 -06:00 committed by Greg Kroah-Hartman
parent a99de19128
commit df452ea24b
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/panel/panel-novatek-nt35560.c
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@ -162,7 +162,7 @@ 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;
}