disp: msm: update seamless check for connector

During CWB case where writeback connector is disabled
and connectors_changed is set, add support to allow
disabling of corresponding encoder for this connector.
Modify the seamless check for connector to handle
the same. With this cwb + dfps concurrency can
be handled.

Change-Id: Ia8f86bd12ac3c5ab622334fb04cdcb2e2b60f111
Signed-off-by: Krishna Manikandan <mkrishn@codeaurora.org>
Signed-off-by: Steve Cohen <cohens@codeaurora.org>

msm/msm_atomic.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2016-2020, The Linux Foundation. All rights reserved.
  * Copyright (C) 2014 Red Hat
  * Author: Rob Clark <robdclark@gmail.com>
  *
@@ -83,6 +83,10 @@ static inline bool _msm_seamless_for_conn(struct drm_connector *connector,
 	if (enable)
 		return false;
 
+	if (!connector->state->crtc &&
+		old_conn_state->crtc->state->connectors_changed)
+		return false;
+
 	if (msm_is_mode_seamless(&connector->encoder->crtc->state->mode))
 		return true;