drm/display/dp_mst: Handle old/new payload states in drm_dp_remove_payload()

Atm, drm_dp_remove_payload() uses the same payload state to both get the
vc_start_slot required for the payload removal DPCD message and to
deduct time_slots from vc_start_slot of all payloads after the one being
removed.

The above isn't always correct, as vc_start_slot must be the up-to-date
version contained in the new payload state, but time_slots must be the
one used when the payload was previously added, contained in the old
payload state. The new payload's time_slots can change vs. the old one
if the current atomic commit changes the corresponding mode.

This patch let's drivers pass the old and new payload states to
drm_dp_remove_payload(), but keeps these the same for now in all drivers
not to change the behavior. A follow-up i915 patch will pass in that
driver the correct old and new states to the function.

Cc: Lyude Paul <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Ben Skeggs <[email protected]>
Cc: Karol Herbst <[email protected]>
Cc: Harry Wentland <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: Wayne Lin <[email protected]>
Cc: [email protected] # 6.1
Cc: [email protected]
Reviewed-by: Ville Syrjälä <[email protected]>
Reviewed-by: Lyude Paul <[email protected]>
Acked-by: Lyude Paul <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
Acked-by: Wayne Lin <[email protected]>
Acked-by: Jani Nikula <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index f3cb12dcfe0a..dc4e5ff1dbb3 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -526,6 +526,8 @@ static void intel_mst_disable_dp(struct intel_atomic_state *state,
 		to_intel_connector(old_conn_state->connector);
 	struct drm_dp_mst_topology_state *mst_state =
 		drm_atomic_get_mst_topology_state(&state->base, &intel_dp->mst_mgr);
+	struct drm_dp_mst_atomic_payload *payload =
+		drm_atomic_get_mst_payload_state(mst_state, connector->port);
 	struct drm_i915_private *i915 = to_i915(connector->base.dev);
 
 	drm_dbg_kms(&i915->drm, "active links %d\n",
@@ -534,7 +536,7 @@ static void intel_mst_disable_dp(struct intel_atomic_state *state,
 	intel_hdcp_disable(intel_mst->connector);
 
 	drm_dp_remove_payload(&intel_dp->mst_mgr, mst_state,
-			      drm_atomic_get_mst_payload_state(mst_state, connector->port));
+			      payload, payload);
 
 	intel_audio_codec_disable(encoder, old_crtc_state, old_conn_state);
 }