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drm/amd/display: Use HBR2 if eDP monitor it doesn't advertise link rate 

Some eDP displays use the extra link rate table to advertise link rate
support. If they do that they don't need to provide link rate through
the usual registers. Since we don't currently have support for the extra
link rate table default to HBR2 for the display in this.

Note that this is a HACK. Ultimately we need to teach DC to use the
extra link rate table.

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Harry Wentland 2017-11-21 13:34:48 -05:00 committed by Alex Deucher
parent 221adb2172
commit 48231fd516
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
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@ -2393,6 +2393,10 @@ bool detect_dp_sink_caps(struct dc_link *link)
void detect_edp_sink_caps(struct dc_link *link)
{
retrieve_link_cap(link);
if (link->reported_link_cap.link_rate == LINK_RATE_UNKNOWN)
link->reported_link_cap.link_rate = LINK_RATE_HIGH2;
link->verified_link_cap = link->reported_link_cap;
}