[PATCH v2 4/6] drm/atomic: add connector mask to drm_crtc_state.

[Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>]

It can be useful to iterate over connectors without grabbing
connection_mutex. It can also be used to see how many connectors
are on a crtc without iterating over the list.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/drm_atomic.c | 11 +++++++++++
 include/drm/drm_crtc.h       |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 6a21e5c378c1..14b321580517 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1063,10 +1063,21 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 {
 	struct drm_crtc_state *crtc_state;
 
+	if (conn_state->crtc && conn_state->crtc != crtc) {
+		crtc_state = drm_atomic_get_existing_crtc_state(conn_state->state,
+								conn_state->crtc);
+
+		crtc_state->connector_mask &=
+			~(1 << drm_connector_index(conn_state->connector));
+	}
+
 	if (crtc) {
 		crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
 		if (IS_ERR(crtc_state))
 			return PTR_ERR(crtc_state);
+
+		crtc_state->connector_mask |=
+			1 << drm_connector_index(conn_state->connector);
 	}
 
 	conn_state->crtc = crtc;
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index c2f98ba2bb98..dd0db4ceab26 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -301,6 +301,7 @@ struct drm_plane_helper_funcs;
  * @active_changed: crtc_state->active has been toggled.
  * @connectors_changed: connectors to this crtc have been updated
  * @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes
+ * @connector_mask: bitmask of (1 << drm_connector_index(connector)) of attached connectors
  * @last_vblank_count: for helpers and drivers to capture the vblank of the
  * 	update to ensure framebuffer cleanup isn't done too early
  * @adjusted_mode: for use by helpers and drivers to compute adjusted mode timings
@@ -334,6 +335,8 @@ struct drm_crtc_state {
 	 */
 	u32 plane_mask;
 
+	u32 connector_mask;
+
 	/* last_vblank_count: for vblank waits before cleanup */
 	u32 last_vblank_count;
 
-- 
2.1.0

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