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From 0c35e4608756e725b4487a1e203f914024afb97a Mon Sep 17 00:00:00 2001
From: Martin Tsai <martin.tsai@amd.com>
Date: Thu, 22 Aug 2019 10:02:13 +0800
Subject: [PATCH 3834/4256] drm/amd/display: Handle virtual signal type in
disable_link()
[Why]
The new implementation changed the behavior to allow process setMode
to DAL when DAL returns empty mode query for unplugged display.
This will trigger additional disable_link().
When unplug HDMI from MST dock, driver will update stream->signal to
"Virtual". disable_link() will call disable_output() if the signal type
is not DP and induce other displays on MST dock show black screen.
[How]
Don't need to process disable_output() if the signal type is virtual.
Signed-off-by: Martin Tsai <martin.tsai@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
---
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
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 fcc25eea0d8f..a20310feb352 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -2166,8 +2166,10 @@ static void disable_link(struct dc_link *link, enum signal_type signal)
dp_set_fec_ready(link, false);
}
#endif
- } else
- link->link_enc->funcs->disable_output(link->link_enc, signal);
+ } else {
+ if (signal != SIGNAL_TYPE_VIRTUAL)
+ link->link_enc->funcs->disable_output(link->link_enc, signal);
+ }
if (signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
/* MST disable link only when no stream use the link */
--
2.17.1
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