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

[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>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 260a01ebd88894fd47c007e7f05c13a7a082df9b..699e1ee750359436e937a95a1e519f3221ab8a2f 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -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);