drm/display/dp_mst: Maintain time slot allocations when deleting payloads

Currently, we set drm_dp_atomic_payload->time_slots to 0 in order to
indicate that we're about to delete a payload in the current atomic state.
Since we're going to be dropping all of the legacy code for handling the
payload table however, we need to be able to ensure that we still keep
track of the current time slot allocations for each payload so we can reuse
this info when asking the root MST hub to delete payloads. We'll also be
using it to recalculate the start slots of each VC.

So, let's keep track of the intent of a payload in drm_dp_atomic_payload by
adding ->delete, which we set whenever we're planning on deleting a payload
during the current atomic commit.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: Wayne Lin <Wayne.Lin@amd.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Fangzhi Zuo <Jerry.Zuo@amd.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Sean Paul <sean@poorly.run>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220817193847.557945-16-lyude@redhat.com

1 files changed, 4 insertions, 1 deletions

diff --git a/include/drm/display/drm_dp_mst_helper.h b/include/drm/display/drm_dp_mst_helper.h
index b9c361b242ea..8b847836a0b4 100644
--- a/include/drm/display/drm_dp_mst_helper.h
+++ b/include/drm/display/drm_dp_mst_helper.h
@@ -560,8 +560,11 @@ struct drm_dp_mst_atomic_payload {
 	int time_slots;
 	/** @pbn: The payload bandwidth for this payload */
 	int pbn;
+
+	/** @delete: Whether or not we intend to delete this payload during this atomic commit */
+	bool delete : 1;
 	/** @dsc_enabled: Whether or not this payload has DSC enabled */
-	bool dsc_enabled;
+	bool dsc_enabled : 1;
 
 	/** @next: The list node for this payload */
 	struct list_head next;