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drm/amd/display: Link train only when link is DP and backend is enabled

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[Why]
In certain cases we do link training when we don't have a backend.

[How]
In dc_link_set_preferred_link_settings(), store preferred link settings
first and then verify that the link is DP and the link stream's backend is
enabled.  If either is false, then we will not do any link retraining.

Signed-off-by: Samson Tam <Samson.Tam@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Samson Tam 2019-03-04 16:21:06 -05:00 committed by Alex Deucher
parent c23f95ae70
commit 66acd4418d
1 changed files with 12 additions and 1 deletions
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13
drivers/gpu/drm/amd/display/dc/core/dc.c
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@ -524,6 +524,14 @@ void dc_link_set_preferred_link_settings(struct dc *dc,
struct dc_stream_state *link_stream;
struct dc_link_settings store_settings = *link_setting;
link->preferred_link_setting = store_settings;
/* Retrain with preferred link settings only relevant for
* DP signal type
*/
if (!dc_is_dp_signal(link->connector_signal))
return;
for (i = 0; i < MAX_PIPES; i++) {
pipe = &dc->current_state->res_ctx.pipe_ctx[i];
if (pipe->stream && pipe->stream->link) {
@ -538,7 +546,10 @@ void dc_link_set_preferred_link_settings(struct dc *dc,
link_stream = link->dc->current_state->res_ctx.pipe_ctx[i].stream;
link->preferred_link_setting = store_settings;
/* Cannot retrain link if backend is off */
if (link_stream->dpms_off)
return;
if (link_stream)
decide_link_settings(link_stream, &store_settings);