drm/sun4i: Fix DE2 YVU handling

Function sun8i_vi_layer_get_csc_mode() is supposed to return CSC mode
but due to inproper return type (bool instead of u32) it returns just 0
or 1. Colors are wrong for YVU formats because of that.

Fixes: daab3d0 ("drm/sun4i: de2: csc_mode in de2 format struct is mostly redundant")
Reported-by: Roman Stratiienko <[email protected]>
Signed-off-by: Jernej Skrabec <[email protected]>
Tested-by: Roman Stratiienko <[email protected]>
Signed-off-by: Maxime Ripard <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: jernejsk

drivers/gpu/drm/sun4i/sun8i_vi_layer.c

@@ -211,7 +211,7 @@ static int sun8i_vi_layer_update_coord(struct sun8i_mixer *mixer, int channel,
 	return 0;
 }
 
-static bool sun8i_vi_layer_get_csc_mode(const struct drm_format_info *format)
+static u32 sun8i_vi_layer_get_csc_mode(const struct drm_format_info *format)
 {
 	if (!format->is_yuv)
 		return SUN8I_CSC_MODE_OFF;