[PATCH v2 13/16] drm/udl: Add register constants for color depth

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Add the register constants for setting the color depth. The driver
only uses 16bpp. No functional changes.

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Reviewed-by: Javier Martinez Canillas <javierm@xxxxxxxxxx>
---
 drivers/gpu/drm/udl/udl_modeset.c | 2 +-
 drivers/gpu/drm/udl/udl_proto.h   | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c
index 12385bcc71eb..f8562d46b707 100644
--- a/drivers/gpu/drm/udl/udl_modeset.c
+++ b/drivers/gpu/drm/udl/udl_modeset.c
@@ -56,7 +56,7 @@ static char *udl_set_blank_mode(char *buf, u8 mode)
 
 static char *udl_set_color_depth(char *buf, u8 selection)
 {
-	return udl_set_register(buf, 0x00, selection);
+	return udl_set_register(buf, UDL_REG_COLORDEPTH, selection);
 }
 
 static char *udl_set_base16bpp(char *wrptr, u32 base)
diff --git a/drivers/gpu/drm/udl/udl_proto.h b/drivers/gpu/drm/udl/udl_proto.h
index 5a6c960bd10d..22bc1ae8420c 100644
--- a/drivers/gpu/drm/udl/udl_proto.h
+++ b/drivers/gpu/drm/udl/udl_proto.h
@@ -3,7 +3,10 @@
 #ifndef UDL_PROTO_H
 #define UDL_PROTO_H
 
+/* Color depth */
+#define UDL_REG_COLORDEPTH		0x00
 #define UDL_COLORDEPTH_16BPP		0
+#define UDL_COLORDEPTH_24BPP		1
 
 /* Display-mode settings */
 #define UDL_REG_XDISPLAYSTART		0x01
-- 
2.37.3




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