[PATCH 24/67] drm/amd/display: Ignore UHBR13.5 cable ID cap for passive cable max link rate

[Zaeem Mohamed]

From: George Shen <george.shen at amd.com>

[Why]
Passive DP40 cables were updated in the latest DP spec to support
UHBR13.5 link rate. Current max link rate logic checks against the
cable ID DPCD even for passive cables.

[How]
Ignore UHBR13.5 cable ID DPCD cap in get_max_link_rate logic.

Reviewed-by: Wenjing Liu <wenjing.liu at amd.com>
Acked-by: Zaeem Mohamed <zaeem.mohamed at amd.com>
Signed-off-by: George Shen <george.shen at amd.com>
---
 .../gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
index 1ff9876e3ca3..41bdadc585b3 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
@@ -2124,7 +2124,8 @@ struct dc_link_settings dp_get_max_link_cap(struct dc_link *link)
 		if (cable_max_link_rate < max_link_cap.link_rate)
 			max_link_cap.link_rate = cable_max_link_rate;
 
-		if (!link->dpcd_caps.cable_id.bits.UHBR13_5_CAPABILITY)
+		if (!link->dpcd_caps.cable_id.bits.UHBR13_5_CAPABILITY &&
+				link->dpcd_caps.cable_id.bits.CABLE_TYPE >= 2)
 			is_uhbr13_5_supported = false;
 	}
 
-- 
2.34.1