From 66acd4418d7de131ef3831e52a8af3d2480e5b15 Mon Sep 17 00:00:00 2001 From: Samson Tam Date: Mon, 4 Mar 2019 16:21:06 -0500 Subject: [PATCH] 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 Reviewed-by: Aric Cyr Acked-by: Anthony Koo Acked-by: Bhawanpreet Lakha Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/core/dc.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c index 260a01ebd888..699e1ee75035 100644 --- 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); -- 2.30.2