diff options
| author | Wenjing Liu <wenjing.liu@amd.com> | 2020-04-05 16:41:13 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2020-04-09 10:43:17 -0400 |
| commit | 8ccf0e20769d96b8d0ccbfcb56bc7ca7874154a4 (patch) | |
| tree | e7e1ba1085e53420574114149841c530b98910c3 /drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | |
| parent | 4404b47852f3ec709f5787c045650afabea00b4b (diff) | |
drm/amd/display: determine USB C DP2 mode only when USB DP Alt is enabled
[why]
When display is connected with a native DP port, DP2 mode register value
is a don't care. Driver mistakenly reduce max supported lane count to 2
lane based on the don't care value.
[how]
Add additional check only if USB C DP alt mode is enabled, we will
determine max lane count supported based on current mode.
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 15 |
1 files changed, 3 insertions, 12 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index 7cbb1efb4f68..74cf06aacd6c 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -1710,19 +1710,10 @@ bool dc_link_dp_sync_lt_end(struct dc_link *link, bool link_down) static struct dc_link_settings get_max_link_cap(struct dc_link *link) { - /* Set Default link settings */ - struct dc_link_settings max_link_cap = {LANE_COUNT_FOUR, LINK_RATE_HIGH, - LINK_SPREAD_05_DOWNSPREAD_30KHZ, false, 0}; - - /* Higher link settings based on feature supported */ - if (link->link_enc->features.flags.bits.IS_HBR2_CAPABLE) - max_link_cap.link_rate = LINK_RATE_HIGH2; - - if (link->link_enc->features.flags.bits.IS_HBR3_CAPABLE) - max_link_cap.link_rate = LINK_RATE_HIGH3; + struct dc_link_settings max_link_cap = {0}; - if (link->link_enc->funcs->get_max_link_cap) - link->link_enc->funcs->get_max_link_cap(link->link_enc, &max_link_cap); + /* get max link encoder capability */ + link->link_enc->funcs->get_max_link_cap(link->link_enc, &max_link_cap); /* Lower link settings based on sink's link cap */ if (link->reported_link_cap.lane_count < max_link_cap.lane_count) |