drm/sun4i: frontend: Add support for the BGRX8888 output format

This introduces support for the BGRX8888 output format for the frontend,
with its associated output format value definition.
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181123092515.2511-23-paul.kocialkowski@bootlin.com

drivers/gpu/drm/sun4i/sun4i_frontend.c

@@ -145,6 +145,10 @@ static int sun4i_frontend_drm_format_to_input_sequence(uint32_t fmt, u32 *val)
 static int sun4i_frontend_drm_format_to_output_fmt(uint32_t fmt, u32 *val)
 {
 	switch (fmt) {
+	case DRM_FORMAT_BGRX8888:
+		*val = SUN4I_FRONTEND_OUTPUT_FMT_DATA_FMT_BGRX8888;
+		return 0;
+
 	case DRM_FORMAT_XRGB8888:
 		*val = SUN4I_FRONTEND_OUTPUT_FMT_DATA_FMT_XRGB8888;
 		return 0;

drivers/gpu/drm/sun4i/sun4i_frontend.h

@@ -32,6 +32,7 @@
 #define SUN4I_FRONTEND_INPUT_FMT_DATA_PS_XRGB		1
 
 #define SUN4I_FRONTEND_OUTPUT_FMT_REG		0x05c
+#define SUN4I_FRONTEND_OUTPUT_FMT_DATA_FMT_BGRX8888	1
 #define SUN4I_FRONTEND_OUTPUT_FMT_DATA_FMT_XRGB8888	2
 
 #define SUN4I_FRONTEND_CH0_INSIZE_REG		0x100