drm/sun4i: frontend: Add proper definitions for format registers

This introduces proper definitions for the input and output format
configuration registers instead of a macro and raw values in the code,
with the intent to increase code readability and reduce indirections.

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/20181123092515.2511-19-paul.kocialkowski@bootlin.com

drivers/gpu/drm/sun4i/sun4i_frontend.h

@@ -26,12 +26,12 @@
 #define SUN4I_FRONTEND_LINESTRD0_REG		0x040
 
 #define SUN4I_FRONTEND_INPUT_FMT_REG		0x04c
-#define SUN4I_FRONTEND_INPUT_FMT_DATA_MOD(mod)		((mod) << 8)
-#define SUN4I_FRONTEND_INPUT_FMT_DATA_FMT(fmt)		((fmt) << 4)
-#define SUN4I_FRONTEND_INPUT_FMT_PS(ps)			(ps)
+#define SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_PACKED	(1 << 8)
+#define SUN4I_FRONTEND_INPUT_FMT_DATA_FMT_RGB		(5 << 4)
+#define SUN4I_FRONTEND_INPUT_FMT_DATA_PS_XRGB		1
 
 #define SUN4I_FRONTEND_OUTPUT_FMT_REG		0x05c
-#define SUN4I_FRONTEND_OUTPUT_FMT_DATA_FMT(fmt)		(fmt)
+#define SUN4I_FRONTEND_OUTPUT_FMT_DATA_FMT_XRGB8888	2
 
 #define SUN4I_FRONTEND_CH0_INSIZE_REG		0x100
 #define SUN4I_FRONTEND_INSIZE(h, w)			((((h) - 1) << 16) | (((w) - 1)))