drm/mediatek: mtk_dpi: Use switch in mtk_dpi_config_color_format()

In preparation for adding support for an additional color format,
convert the format conditional in mtk_dpi_config_color_format()
to a switch.
This also makes the concept of RGB being the default color format
a little more human readable.

This commit brings no functional differences.

Signed-off-by: AngeloGioacchino Del Regno <[email protected]>
Reviewed-by: CK Hu <[email protected]>
Link: https://patchwork.kernel.org/project/dri-devel/patch/[email protected]/
Signed-off-by: Chun-Kuang Hu <[email protected]>

Author: AngeloGioacchino Del Regno

drivers/gpu/drm/mediatek/mtk_dpi.c

@@ -452,7 +452,8 @@ static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
 {
 	mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
 
-	if (format == MTK_DPI_COLOR_FORMAT_YCBCR_422) {
+	switch (format) {
+	case MTK_DPI_COLOR_FORMAT_YCBCR_422:
 		mtk_dpi_config_yuv422_enable(dpi, true);
 		mtk_dpi_config_csc_enable(dpi, true);
 
@@ -463,11 +464,14 @@ static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
 		mtk_dpi_mask(dpi, DPI_MATRIX_SET, dpi->mode.hdisplay <= 720 ?
 			     MATRIX_SEL_RGB_TO_BT601 : MATRIX_SEL_RGB_TO_JPEG,
 			     INT_MATRIX_SEL_MASK);
-	} else {
+		break;
+	default:
+	case MTK_DPI_COLOR_FORMAT_RGB:
 		mtk_dpi_config_yuv422_enable(dpi, false);
 		mtk_dpi_config_csc_enable(dpi, false);
 		if (dpi->conf->swap_input_support)
 			mtk_dpi_config_swap_input(dpi, false);
+		break;
 	}
 }