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From d9e8bbbc6fffd210c026fa011ed1b556d00eaea0 Mon Sep 17 00:00:00 2001
From: Nikola Cornij <nikola.cornij@amd.com>
Date: Tue, 29 Oct 2019 15:49:28 -0400
Subject: [PATCH 4483/4736] drm/amd/display: Connect DIG FE to its BE before
link training starts
[why]
In SST mode no idle pattern will be generated after link training if
DIG FE is not connected to DIG BE.
Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
---
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 7fab34ce0591..58b63612c926 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -1546,6 +1546,10 @@ static enum dc_status enable_link_dp(
panel_mode = dp_get_panel_mode(link);
dp_set_panel_mode(link, panel_mode);
+ /* We need to do this before the link training to ensure the idle pattern in SST
+ * mode will be sent right after the link training */
+ link->link_enc->funcs->connect_dig_be_to_fe(link->link_enc,
+ pipe_ctx->stream_res.stream_enc->id, true);
skip_video_pattern = true;
if (link_settings.link_rate == LINK_RATE_LOW)
--
2.17.1
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