drm/amd/display: Add AUX backlight register

Introduce vendor-specific registers for handling backlight via AUX.
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

@@ -20,14 +20,6 @@
 
 #define DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE   0x50
 
-#define DP_SOURCE_TABLE_REVISION	    0x310
-#define DP_SOURCE_PAYLOAD_SIZE		    0x311
-#define DP_SOURCE_SINK_CAP		    0x317
-#define DP_SOURCE_BACKLIGHT_LEVEL	    0x320
-#define DP_SOURCE_BACKLIGHT_CURRENT_PEAK    0x326
-#define DP_SOURCE_BACKLIGHT_CONTROL	    0x32E
-#define DP_SOURCE_BACKLIGHT_ENABLE	    0x32F
-
 /* maximum pre emphasis level allowed for each voltage swing level*/
 static const enum dc_pre_emphasis voltage_swing_to_pre_emphasis[] = {
 		PRE_EMPHASIS_LEVEL3,

drivers/gpu/drm/amd/display/include/dpcd_defs.h

@@ -149,4 +149,12 @@ enum dpcd_psr_sink_states {
 	PSR_SINK_STATE_SINK_INTERNAL_ERROR = 7,
 };
 
+#define DP_SOURCE_TABLE_REVISION	    0x310
+#define DP_SOURCE_PAYLOAD_SIZE		    0x311
+#define DP_SOURCE_SINK_CAP		    0x317
+#define DP_SOURCE_BACKLIGHT_LEVEL	    0x320
+#define DP_SOURCE_BACKLIGHT_CURRENT_PEAK    0x326
+#define DP_SOURCE_BACKLIGHT_CONTROL	    0x32E
+#define DP_SOURCE_BACKLIGHT_ENABLE	    0x32F
+
 #endif /* __DAL_DPCD_DEFS_H__ */