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 342e906..c88f044 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -3995,10 +3995,13 @@ 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
@@ -4014,7 +4017,7 @@ 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
                 */
@@ -4077,11 +4080,18 @@ 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;
 }