From 42a81ef6fa794d4fcf39ebb2c618a2e451fcc2bd Mon Sep 17 00:00:00 2001
From: Charlene Liu <Charlene.Liu@amd.com>
Date: Tue, 22 Jun 2021 21:32:53 -0400
Subject: drm/amd/display: reset dpcd_cap.dpcd_rev for passive dongle.
Git-commit: 1e9653a41aaf39c33248ddbd4059ad3cb462a214
Patch-mainline: v5.15-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
[why]
currently dc has never reset this dpcd_cap.dpcd_rev.
[how]
ideally we should reset this before redo detection.
change the passive dongle only for now to reduce the impact.
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 2 ++
1 file changed, 2 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 6132b645bfd1..655b48c5ef37 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -541,6 +541,7 @@ static void link_disconnect_sink(struct dc_link *link)
}
link->dpcd_sink_count = 0;
+ //link->dpcd_caps.dpcd_rev.raw = 0;
}
static void link_disconnect_remap(struct dc_sink *prev_sink, struct dc_link *link)
@@ -742,6 +743,7 @@ static bool detect_dp(struct dc_link *link,
sink_caps,
audio_support);
link->dpcd_caps.dongle_type = sink_caps->dongle_type;
+ link->dpcd_caps.dpcd_rev.raw = 0;
}
return true;
--
2.38.1