On 29/07/2025 07:44, Brigham Campbell wrote:
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: 7835ed6a9e86 ("drm/panel-sony-acx424akp: Modernize backlight handling") Signed-off-by: Brigham Campbell <[email protected]> --- 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 98f0782c8411..17898a29efe8 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; }
Reviewed-by: Neil Armstrong <[email protected]>
