The patch below does not apply to the 6.2-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.2.y git checkout FETCH_HEAD git cherry-pick -x 2daeb74b7d66362de8e15b983e310e85f01930e5 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '1678448220112184@kroah.com' --subject-prefix 'PATCH 6.2.y' HEAD^..

Possible dependencies:

2daeb74b7d66 ("drm/amdgpu/display/mst: update mst_mgr relevant variable when long HPD")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 2daeb74b7d66362de8e15b983e310e85f01930e5 Mon Sep 17 00:00:00 2001 From: Wayne Lin Wayne.Lin@amd.com Date: Mon, 12 Dec 2022 15:41:18 +0800 Subject: [PATCH] drm/amdgpu/display/mst: update mst_mgr relevant variable when long HPD

[Why & How] Now the vc_start_slot is controlled at drm side. When we service a long HPD, we still need to run dm_helpers_dp_mst_write_payload_allocation_table() to update drm mst_mgr's relevant variable. Otherwise, on the next plug-in, payload will get assigned with a wrong start slot.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2171 Signed-off-by: Wayne Lin Wayne.Lin@amd.com Signed-off-by: Harry Wentland harry.wentland@amd.com Fixes: 4d07b0bc4034 ("drm/display/dp_mst: Move all payload info into the atomic state") Cc: stable@vger.kernel.org # 6.1 Acked-by: Harry Wentland harry.wentland@amd.com Reviewed-by: Lyude Paul lyude@redhat.com Tested-by: Didier Raboud odyx@debian.org Signed-off-by: Alex Deucher alexander.deucher@amd.com

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 d9e490eca10f..bf5a31e2be8a 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -3999,10 +3999,13 @@ static enum dc_status deallocate_mst_payload(struct pipe_ctx *pipe_ctx) struct fixed31_32 avg_time_slots_per_mtp = dc_fixpt_from_int(0); int i; bool mst_mode = (link->type == dc_connection_mst_branch); + /* adjust for drm changes*/ + bool update_drm_mst_state = true; const struct link_hwss *link_hwss = get_link_hwss(link, &pipe_ctx->link_res); const struct dc_link_settings empty_link_settings = {0}; DC_LOGGER_INIT(link->ctx->logger);

+ /* deallocate_mst_payload is called before disable link. When mode or * disable/enable monitor, new stream is created which is not in link * stream[] yet. For this, payload is not allocated yet, so de-alloc @@ -4018,7 +4021,7 @@ static enum dc_status deallocate_mst_payload(struct pipe_ctx *pipe_ctx) &empty_link_settings, avg_time_slots_per_mtp);

- if (mst_mode) { + if (mst_mode || update_drm_mst_state) { /* when link is in mst mode, reply on mst manager to remove * payload */ @@ -4081,11 +4084,18 @@ static enum dc_status deallocate_mst_payload(struct pipe_ctx *pipe_ctx) stream->ctx, stream);

+ if (!update_drm_mst_state) + dm_helpers_dp_mst_send_payload_allocation( + stream->ctx, + stream, + false); + } + + if (update_drm_mst_state) dm_helpers_dp_mst_send_payload_allocation( stream->ctx, stream, false); - }

return DC_OK; }