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drm/amd/display: allow DP40 cables to do UHBR13.5

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why:
With DP2.1a expansion we are allowing DP40 cables to do UHBR13.5

how:
Assume UHBR10 means UHBR13.5 also for unknown cable type and
passive cable type.

Reviewed-by: George Shen <george.shen@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Ran Shi <ran.shi@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ran Shi 2023-12-06 14:52:24 -05:00 committed by Alex Deucher
parent 7f9b4fb450
commit af68153ffe
1 changed files with 10 additions and 4 deletions
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14
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
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@ -412,12 +412,18 @@ static enum dc_link_rate get_cable_max_link_rate(struct dc_link *link)
{
enum dc_link_rate cable_max_link_rate = LINK_RATE_UNKNOWN;
if (link->dpcd_caps.cable_id.bits.UHBR10_20_CAPABILITY & DP_UHBR20)
if (link->dpcd_caps.cable_id.bits.UHBR10_20_CAPABILITY & DP_UHBR20) {
cable_max_link_rate = LINK_RATE_UHBR20;
else if (link->dpcd_caps.cable_id.bits.UHBR13_5_CAPABILITY)
} else if (link->dpcd_caps.cable_id.bits.UHBR13_5_CAPABILITY) {
cable_max_link_rate = LINK_RATE_UHBR13_5;
else if (link->dpcd_caps.cable_id.bits.UHBR10_20_CAPABILITY & DP_UHBR10)
cable_max_link_rate = LINK_RATE_UHBR10;
} else if (link->dpcd_caps.cable_id.bits.UHBR10_20_CAPABILITY & DP_UHBR10) {
// allow DP40 cables to do UHBR13.5 for passive or unknown cable type
if (link->dpcd_caps.cable_id.bits.CABLE_TYPE < 2) {
cable_max_link_rate = LINK_RATE_UHBR13_5;
} else {
cable_max_link_rate = LINK_RATE_UHBR10;
}
}
return cable_max_link_rate;
}