drm/amd/display: Update test link rate DPCD bit field to match spec

[Why]
An SCR was made to the DP2.0 spec that updated the bit field definition
for UHBR13.5 in the test link rate DPCD register.

[How]
Add new translation to match the SCR update. Keep old translation for
backwards compatibility.
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Acked-by: Hersen Wu <hersenxs.wu@amd.com>
Signed-off-by: George Shen <george.shen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -142,7 +142,8 @@ enum dp_test_link_rate {
 	DP_TEST_LINK_RATE_HBR3		= 0x1E,
 	DP_TEST_LINK_RATE_UHBR10	= 0x01,
 	DP_TEST_LINK_RATE_UHBR20	= 0x02,
-	DP_TEST_LINK_RATE_UHBR13_5	= 0x03,
+	DP_TEST_LINK_RATE_UHBR13_5_LEGACY	= 0x03, /* For backward compatibility*/
+	DP_TEST_LINK_RATE_UHBR13_5	= 0x04,
 };
 
 struct dc_link_settings {

drivers/gpu/drm/amd/display/dc/link/accessories/link_dp_cts.c

@@ -53,6 +53,7 @@ static enum dc_link_rate get_link_rate_from_test_link_rate(uint8_t test_rate)
 		return LINK_RATE_UHBR10;
 	case DP_TEST_LINK_RATE_UHBR20:
 		return LINK_RATE_UHBR20;
+	case DP_TEST_LINK_RATE_UHBR13_5_LEGACY:
 	case DP_TEST_LINK_RATE_UHBR13_5:
 		return LINK_RATE_UHBR13_5;
 	default:
@@ -119,6 +120,11 @@ static void dp_test_send_link_training(struct dc_link *link)
 			1);
 	link_settings.link_rate = get_link_rate_from_test_link_rate(test_rate);
 
+	if (link_settings.link_rate == LINK_RATE_UNKNOWN) {
+		DC_LOG_ERROR("%s: Invalid test link rate.", __func__);
+		ASSERT(0);
+	}
+
 	/* Set preferred link settings */
 	link->verified_link_cap.lane_count = link_settings.lane_count;
 	link->verified_link_cap.link_rate = link_settings.link_rate;
@@ -457,7 +463,7 @@ static void set_crtc_test_pattern(struct dc_link *link,
 			controller_color_space = pipe_ctx->stream_res.test_pattern_params.color_space;
 
 			if (controller_color_space == CONTROLLER_DP_COLOR_SPACE_UDEFINED) {
-				DC_LOG_WARNING("%s: Color space must be defined for test pattern", __func__);
+				DC_LOG_ERROR("%s: Color space must be defined for test pattern", __func__);
 				ASSERT(0);
 			}