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

[David Heidelberg via B4 Relay]

From: David Heidelberg <da...@ixit.cz>

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 <da...@ixit.cz>
---
 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))

-- 
2.55.0