drm/atomic: Always call steal_encoder, v2.

There's no need to have a separate function to get the crtc
which is stolen, this can already be found when actually
stealing the encoder.

drm_for_each_connector already checks for connection_mutex, so
use that macro now.

Changes since v1:
- Do not check for NULL crtc in connector_state,
  this may happen when a crtc is disabled and its encoder stolen.
- Because of this, use connector->state->crtc instead of conn_state->crtc.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1456996662-8704-4-git-send-email-maarten.lankhorst@linux.intel.com

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index ed28ca1..32f6f57 100644 (file)
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -106,25 +106,6 @@ check_pending_encoder_assignment(struct drm_atomic_state *state,
        return true;
 }
 
-static struct drm_crtc *
-get_current_crtc_for_encoder(struct drm_device *dev,
-                            struct drm_encoder *encoder)
-{
-       struct drm_mode_config *config = &dev->mode_config;
-       struct drm_connector *connector;
-
-       WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
-
-       drm_for_each_connector(connector, dev) {
-               if (connector->state->best_encoder != encoder)
-                       continue;
-
-               return connector->state->crtc;
-       }
-
-       return NULL;
-}
-
 static void
 set_best_encoder(struct drm_atomic_state *state,
                 struct drm_connector_state *conn_state,
@@ -168,38 +149,18 @@ set_best_encoder(struct drm_atomic_state *state,
 
 static int
 steal_encoder(struct drm_atomic_state *state,
-             struct drm_encoder *encoder,
-             struct drm_crtc *encoder_crtc)
+             struct drm_encoder *encoder)
 {
-       struct drm_mode_config *config = &state->dev->mode_config;
        struct drm_crtc_state *crtc_state;
        struct drm_connector *connector;
        struct drm_connector_state *connector_state;
 
-       /*
-        * We can only steal an encoder coming from a connector, which means we
-        * must already hold the connection_mutex.
-        */
-       WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
-
-       DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s], stealing it\n",
-                        encoder->base.id, encoder->name,
-                        encoder_crtc->base.id, encoder_crtc->name);
+       drm_for_each_connector(connector, state->dev) {
+               struct drm_crtc *encoder_crtc;
 
-       crtc_state = drm_atomic_get_crtc_state(state, encoder_crtc);
-       if (IS_ERR(crtc_state))
-               return PTR_ERR(crtc_state);
-
-       crtc_state->connectors_changed = true;
-
-       list_for_each_entry(connector, &config->connector_list, head) {
                if (connector->state->best_encoder != encoder)
                        continue;
 
-               DRM_DEBUG_ATOMIC("Stealing encoder from [CONNECTOR:%d:%s]\n",
-                                connector->base.id,
-                                connector->name);
-
                connector_state = drm_atomic_get_connector_state(state,
                                                                 connector);
                if (IS_ERR(connector_state))
@@ -208,7 +169,18 @@ steal_encoder(struct drm_atomic_state *state,
                if (connector_state->best_encoder != encoder)
                        continue;
 
+               encoder_crtc = connector->state->crtc;
+
+               DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s], stealing it\n",
+                                encoder->base.id, encoder->name,
+                                encoder_crtc->base.id, encoder_crtc->name);
+
                set_best_encoder(state, connector_state, NULL);
+
+               crtc_state = drm_atomic_get_existing_crtc_state(state, encoder_crtc);
+               crtc_state->connectors_changed = true;
+
+               return 0;
        }
 
        return 0;
@@ -221,7 +193,6 @@ update_connector_routing(struct drm_atomic_state *state,
 {
        const struct drm_connector_helper_funcs *funcs;
        struct drm_encoder *new_encoder;
-       struct drm_crtc *encoder_crtc;
        struct drm_crtc_state *crtc_state;
        int idx, ret;
 
@@ -299,17 +270,12 @@ update_connector_routing(struct drm_atomic_state *state,
                return -EINVAL;
        }
 
-       encoder_crtc = get_current_crtc_for_encoder(state->dev,
-                                                   new_encoder);
-
-       if (encoder_crtc) {
-               ret = steal_encoder(state, new_encoder, encoder_crtc);
-               if (ret) {
-                       DRM_DEBUG_ATOMIC("Encoder stealing failed for [CONNECTOR:%d:%s]\n",
-                                        connector->base.id,
-                                        connector->name);
-                       return ret;
-               }
+       ret = steal_encoder(state, new_encoder);
+       if (ret) {
+               DRM_DEBUG_ATOMIC("Encoder stealing failed for [CONNECTOR:%d:%s]\n",
+                                connector->base.id,
+                                connector->name);
+               return ret;
        }
 
        if (WARN_ON(!connector_state->crtc))