Commit 1b51220d authored by George Shen's avatar George Shen Committed by Alex Deucher
Browse files

drm/amd/display: Ignore UHBR13.5 cable ID cap for passive cable max link rate 



[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: default avatarWenjing Liu <wenjing.liu@amd.com>
Acked-by: default avatarZaeem Mohamed <zaeem.mohamed@amd.com>
Signed-off-by: default avatarGeorge Shen <george.shen@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent e8eff33f

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c

+2 −1
Original line number Diff line number Diff line
@@ -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;

	}