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

[Maarten Lankhorst]

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 at linux.intel.com>
---
 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