drm/amd/display: get remote dpcd caps for timing validation

Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1869,7 +1869,7 @@ enum dc_status dc_link_validate_mode_timing(
 		const struct dc_crtc_timing *timing)
 {
 	uint32_t max_pix_clk = stream->sink->dongle_max_pix_clk;
-	struct dc_dongle_caps *dongle_caps = &link->link_status.dpcd_caps->dongle_caps;
+	struct dc_dongle_caps *dongle_caps = &link->dpcd_caps.dongle_caps;
 
 	/* A hack to avoid failing any modes for EDID override feature on
 	 * topology change such as lower quality cable for DP or different dongle

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

@@ -2127,7 +2127,7 @@ static void get_active_converter_info(
 
 				union dwnstream_port_caps_byte3_hdmi
 					hdmi_caps = {.raw = det_caps[3] };
-				union dwnstream_port_caps_byte1
+				union dwnstream_port_caps_byte2
 					hdmi_color_caps = {.raw = det_caps[2] };
 				link->dpcd_caps.dongle_caps.dp_hdmi_max_pixel_clk =
 					det_caps[1] * 25000;

drivers/gpu/drm/amd/display/dc/dc.h

@@ -1031,6 +1031,7 @@ struct dc_sink {
 
 	/* private to dc_sink.c */
 	struct kref refcount;
+
 };
 
 void dc_sink_retain(struct dc_sink *sink);

drivers/gpu/drm/amd/display/dc/dc_dp_types.h

@@ -255,7 +255,7 @@ enum dpcd_downstream_port_detailed_type {
 	DOWN_STREAM_DETAILED_DP_PLUS_PLUS
 };
 
-union dwnstream_port_caps_byte1 {
+union dwnstream_port_caps_byte2 {
 	struct {
 		uint8_t MAX_BITS_PER_COLOR_COMPONENT:2;
 		uint8_t RESERVED:6;
@@ -298,6 +298,32 @@ union dwnstream_port_caps_byte3_hdmi {
 
 /*4-byte structure for detailed capabilities of a down-stream port
 (DP-to-TMDS converter).*/
+union dwnstream_portxcaps {
+	struct {
+		union dwnstream_port_caps_byte0 byte0;
+		unsigned char max_TMDS_clock;   //byte1
+		union dwnstream_port_caps_byte2 byte2;
+
+		union {
+			union dwnstream_port_caps_byte3_dvi byteDVI;
+			union dwnstream_port_caps_byte3_hdmi byteHDMI;
+		} byte3;
+	} bytes;
+
+	unsigned char raw[4];
+};
+
+union downstream_port {
+	struct {
+		unsigned char   present:1;
+		unsigned char   type:2;
+		unsigned char   format_conv:1;
+		unsigned char   detailed_caps:1;
+		unsigned char   reserved:3;
+	} bits;
+	unsigned char raw;
+};
+
 
 union sink_status {
 	struct {