Patch "drm/amd/display: Add HUBP surface flip interrupt handler" has been added to the 5.15-stable tree

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

    drm/amd/display: Add HUBP surface flip interrupt handler

to the 5.15-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-add-hubp-surface-flip-interrupt-handler.patch
and it can be found in the queue-5.15 subdirectory.

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


>From 7af87fc1ba136143314c870059b8f60180247cbd Mon Sep 17 00:00:00 2001
From: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Date: Mon, 31 Oct 2022 14:58:12 -0400
Subject: drm/amd/display: Add HUBP surface flip interrupt handler

From: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>

commit 7af87fc1ba136143314c870059b8f60180247cbd upstream.

On IGT, there is a test named amd_hotplug, and when the subtest basic is
executed on DCN31, we get the following error:

[drm] *ERROR* [CRTC:71:crtc-0] flip_done timed out
[drm] *ERROR* flip_done timed out
[drm] *ERROR* [CRTC:71:crtc-0] commit wait timed out
[drm] *ERROR* flip_done timed out
[drm] *ERROR* [CONNECTOR:88:DP-1] commit wait timed out
[drm] *ERROR* flip_done timed out
[drm] *ERROR* [PLANE:59:plane-3] commit wait timed out

After enable the page flip log with the below command:

 echo -n 'format "[PFLIP]" +p' > /sys/kernel/debug/dynamic_debug/control

It is possible to see that the flip was submitted, but DC never replied
back, which generates time-out issues. This is an indication that the
HUBP surface flip is missing. This commit fixes this issue by adding
hubp1_set_flip_int to DCN31.

Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@xxxxxxx>
Acked-by: Tom Chung <chiahsuan.chung@xxxxxxx>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hubp.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hubp.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hubp.c
@@ -79,6 +79,7 @@ static struct hubp_funcs dcn31_hubp_func
 	.hubp_init = hubp3_init,
 	.set_unbounded_requesting = hubp31_set_unbounded_requesting,
 	.hubp_soft_reset = hubp31_soft_reset,
+	.hubp_set_flip_int = hubp1_set_flip_int,
 	.hubp_in_blank = hubp1_in_blank,
 };
 


Patches currently in stable-queue which might be from Rodrigo.Siqueira@xxxxxxx are

queue-5.15/drm-amd-display-add-hubp-surface-flip-interrupt-handler.patch
queue-5.15/drm-amd-display-remove-wrong-pipe-control-lock.patch



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