[PATCH AUTOSEL 5.3 013/292] drm/amd/display: Handle virtual signal type in disable_link()

Sasha Levin sashal at kernel.org
Tue Dec 10 21:20:32 UTC 2019

From: Martin Tsai <martin.tsai at amd.com>

[ Upstream commit 616f5b65f1c02d3d6ae370644670d14c57de2fd8 ]

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.

Don't need to process disable_output() if the signal type is virtual.

Signed-off-by: Martin Tsai <martin.tsai at amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu at amd.com>
Acked-by: Leo Li <sunpeng.li at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Sasha Levin <sashal at kernel.org>
 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 355b4ba127966..90217cf83ce17 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -2157,8 +2157,10 @@ static void disable_link(struct dc_link *link, enum signal_type signal)
 			dp_set_fec_ready(link, false);
-	} 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);
+	}
 		/* MST disable link only when no stream use the link */

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