Re: [PATCH v2 2/2] drm/panel: lg-sw43408: use the full DCS brightness range

[Neil Armstrong]

On 8/10/26 11:55, David Heidelberg via B4 Relay wrote:
> From: David Heidelberg <david@xxxxxxx>
>
> The vendor firmware panel configuration (XBL DisplayDxe panel XML)
> declares DCSMaxBrightness 0x332 with a two-byte brightness command,
> and the driver already sends two bytes via
> mipi_dsi_dcs_set_display_brightness_large().
>
> Capping max_brightness at 255 therefore limits the panel to ~31% of
> its real brightness range. Use the firmware maximum.
>
> Fixes: 069a6c0e94f9 ("drm: panel: Add LG sw43408 panel driver")
> Signed-off-by: David Heidelberg <david@xxxxxxx>
> ---
>   drivers/gpu/drm/panel/panel-lg-sw43408.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-lg-sw43408.c b/drivers/gpu/drm/panel/panel-lg-sw43408.c
> index 0bf8e08f10b9c..be132b65b0c13 100644
> --- a/drivers/gpu/drm/panel/panel-lg-sw43408.c
> +++ b/drivers/gpu/drm/panel/panel-lg-sw43408.c
> @@ -203,17 +203,17 @@ static const struct backlight_ops sw43408_backlight_ops = {
>   };
>   
>   static int sw43408_backlight_init(struct sw43408_panel *ctx)
>   {
>   	struct device *dev = &ctx->link->dev;
>   	const struct backlight_properties props = {
>   		.type = BACKLIGHT_PLATFORM,
>   		.brightness = 255,
> -		.max_brightness = 255,
> +		.max_brightness = 818,
>   	};
>   
>   	ctx->base.backlight = devm_backlight_device_register(dev, dev_name(dev), dev,
>   							     ctx->link,
>   							     &sw43408_backlight_ops,
>   							     &props);
>   
>   	if (IS_ERR(ctx->base.backlight))

Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>

Thanks,
Neil