From: George Shen Date: Thu, 23 May 2024 20:01:21 +0000 (-0400) Subject: drm/amd/display: Ignore UHBR13.5 cable ID cap for passive cable max link rate X-Git-Tag: v6.11-rc1~141^2~18^2~100 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1b51220dc28cd34f80467acaff60294348cf6675;p=thirdparty%2Fkernel%2Flinux.git 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: Wenjing Liu Acked-by: Zaeem Mohamed Signed-off-by: George Shen Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher --- 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 1ff9876e3ca37..41bdadc585b38 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; }