Patch "drm/amd/display: Fix TDR eDP and USB4 display light up issue" has been added to the 5.19-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/amd/display: Fix TDR eDP and USB4 display light up issue

to the 5.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amd-display-fix-tdr-edp-and-usb4-display-light-u.patch
and it can be found in the queue-5.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 4d6df4055a070992b07c61196cf8cd84352c8503
Author: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@xxxxxxx>
Date:   Mon Jul 11 18:37:41 2022 -0400

    drm/amd/display: Fix TDR eDP and USB4 display light up issue
    
    [ Upstream commit 30456ffa65469d1d2e5e1da05017e6728d24c11c ]
    
    [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.
    
    Reviewed-by: Jimmy Kizito <Jimmy.Kizito@xxxxxxx>
    Reviewed-by: Jun Lei <Jun.Lei@xxxxxxx>
    Acked-by: Tom Chung <chiahsuan.chung@xxxxxxx>
    Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@xxxxxxx>
    Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index f144494011882..7d69341acca02 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -3783,6 +3783,7 @@ 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 a3c37ee3f849c..f96f53c1bc258 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_link.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_link.h
@@ -337,6 +337,7 @@ 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);