drm/udl: Add register constants for color depth

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

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221006095355.23579-14-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c
index 12385bc..f8562d4 100644 (file)
--- 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 5a6c960..22bc1ae 100644 (file)
--- 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