drm/ingenic: Add support for 24-bit modes

Starting from the JZ4725B SoC, the primary and overlay planes support
24-bit pixel modes (8 bits per color component, without dummy byte).
Add support for these in the ingenic-drm driver.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200926170501.1109197-8-paul@crapouillou.net

drivers/gpu/drm/ingenic/ingenic-drm-drv.c

@@ -455,6 +455,9 @@ void ingenic_drm_plane_config(struct device *dev,
 		case DRM_FORMAT_RGB565:
 			ctrl |= JZ_LCD_OSDCTRL_BPP_15_16;
 			break;
+		case DRM_FORMAT_RGB888:
+			ctrl |= JZ_LCD_OSDCTRL_BPP_24_COMP;
+			break;
 		case DRM_FORMAT_XRGB8888:
 			ctrl |= JZ_LCD_OSDCTRL_BPP_18_24;
 			break;
@@ -473,6 +476,9 @@ void ingenic_drm_plane_config(struct device *dev,
 		case DRM_FORMAT_RGB565:
 			ctrl |= JZ_LCD_CTRL_BPP_15_16;
 			break;
+		case DRM_FORMAT_RGB888:
+			ctrl |= JZ_LCD_CTRL_BPP_24_COMP;
+			break;
 		case DRM_FORMAT_XRGB8888:
 			ctrl |= JZ_LCD_CTRL_BPP_18_24;
 			break;
@@ -1227,6 +1233,7 @@ static const u32 jz4725b_formats_f0[] = {
 static const u32 jz4770_formats_f1[] = {
 	DRM_FORMAT_XRGB1555,
 	DRM_FORMAT_RGB565,
+	DRM_FORMAT_RGB888,
 	DRM_FORMAT_XRGB8888,
 	DRM_FORMAT_XRGB2101010,
 };
@@ -1234,6 +1241,7 @@ static const u32 jz4770_formats_f1[] = {
 static const u32 jz4770_formats_f0[] = {
 	DRM_FORMAT_XRGB1555,
 	DRM_FORMAT_RGB565,
+	DRM_FORMAT_RGB888,
 	DRM_FORMAT_XRGB8888,
 	DRM_FORMAT_XRGB2101010,
 };

drivers/gpu/drm/ingenic/ingenic-drm.h

@@ -124,6 +124,7 @@
 #define JZ_LCD_CTRL_BPP_8			0x3
 #define JZ_LCD_CTRL_BPP_15_16			0x4
 #define JZ_LCD_CTRL_BPP_18_24			0x5
+#define JZ_LCD_CTRL_BPP_24_COMP			0x6
 #define JZ_LCD_CTRL_BPP_30			0x7
 #define JZ_LCD_CTRL_BPP_MASK			(JZ_LCD_CTRL_RGB555 | 0x7)
 
@@ -146,6 +147,7 @@
 #define JZ_LCD_OSDCTRL_CHANGE			BIT(3)
 #define JZ_LCD_OSDCTRL_BPP_15_16		0x4
 #define JZ_LCD_OSDCTRL_BPP_18_24		0x5
+#define JZ_LCD_OSDCTRL_BPP_24_COMP		0x6
 #define JZ_LCD_OSDCTRL_BPP_30			0x7
 #define JZ_LCD_OSDCTRL_BPP_MASK			(JZ_LCD_OSDCTRL_RGB555 | 0x7)