[PATCH 31/32] drm/amd/display: Fix TDR eDP and USB4 display light up issue

[Tom Chung]

From: Meenakshikumar Somasundaram <meenakshikumar.somasundaram at amd.com>

[Why]
After TDR recovery, eDP and USB4 display does not light up. Because
dmub outbox notifications are not enabled after dmub reload and link
encoder assignments for the streams are not cleared before dc state
reset.

[How]
- Dmub outbox notification is enabled after tdr recovery by issuing
  inbox command to dmub.
- Link encoders for the streams are unassigned before dc state reset.
- Added WindowsDM::forceDpiaUnplugForTdr() API to remove all the enabled
  DPIA links. Because after fw reload during TDR, current DPIA pairing is
  meaningless and there would be new pairing process.

Reviewed-by: Jimmy Kizito <Jimmy.Kizito at amd.com>
Reviewed-by: Jun Lei <Jun.Lei at amd.com>
Acked-by: Tom Chung <chiahsuan.chung at amd.com>
Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 1 +
 drivers/gpu/drm/amd/display/dc/dc_link.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 08f533f86520..0bc6174aae61 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -4340,6 +4340,7 @@ void dc_enable_dmub_outbox(struct dc *dc)
 	struct dc_context *dc_ctx = dc->ctx;
 
 	dmub_enable_outbox_notification(dc_ctx->dmub_srv);
+	DC_LOG_DC("%s: dmub outbox notifications enabled\n", __func__);
 }
 
 /**
diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h
index a0af0f6afeef..9544abf75e84 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_link.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_link.h
@@ -344,6 +344,7 @@ enum dc_detect_reason {
 	DETECT_REASON_HPDRX,
 	DETECT_REASON_FALLBACK,
 	DETECT_REASON_RETRAIN,
+	DETECT_REASON_TDR,
 };
 
 bool dc_link_detect(struct dc_link *dc_link, enum dc_detect_reason reason);
-- 
2.25.1