drm/atomic: Add encoder_mask to crtc_state, v3.
This allows iteration over encoders without requiring connection_mutex.
Changes since v1:
- Add a set_best_encoder helper function and update encoder_mask inside
it.
Changes since v2:
- Relax the WARN_ON(!crtc), with explanation.
- Call set_best_encoder when connector is moved between crtc's.
- Add some paranoia to steal_encoder to prevent accidentally setting
best_encoder to NULL.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/56AA200A.6070501@linux.intel.com
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 254f6d0..2b430b0 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -125,6 +125,47 @@
return NULL;
}
+static void
+set_best_encoder(struct drm_atomic_state *state,
+ struct drm_connector_state *conn_state,
+ struct drm_encoder *encoder)
+{
+ struct drm_crtc_state *crtc_state;
+ struct drm_crtc *crtc;
+
+ if (conn_state->best_encoder) {
+ /* Unset the encoder_mask in the old crtc state. */
+ crtc = conn_state->connector->state->crtc;
+
+ /* A NULL crtc is an error here because we should have
+ * duplicated a NULL best_encoder when crtc was NULL.
+ * As an exception restoring duplicated atomic state
+ * during resume is allowed, so don't warn when
+ * best_encoder is equal to encoder we intend to set.
+ */
+ WARN_ON(!crtc && encoder != conn_state->best_encoder);
+ if (crtc) {
+ crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);
+
+ crtc_state->encoder_mask &=
+ ~(1 << drm_encoder_index(conn_state->best_encoder));
+ }
+ }
+
+ if (encoder) {
+ crtc = conn_state->crtc;
+ WARN_ON(!crtc);
+ if (crtc) {
+ crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);
+
+ crtc_state->encoder_mask |=
+ 1 << drm_encoder_index(encoder);
+ }
+ }
+
+ conn_state->best_encoder = encoder;
+}
+
static int
steal_encoder(struct drm_atomic_state *state,
struct drm_encoder *encoder,
@@ -164,7 +205,10 @@
if (IS_ERR(connector_state))
return PTR_ERR(connector_state);
- connector_state->best_encoder = NULL;
+ if (connector_state->best_encoder != encoder)
+ continue;
+
+ set_best_encoder(state, connector_state, NULL);
}
return 0;
@@ -212,7 +256,7 @@
connector->base.id,
connector->name);
- connector_state->best_encoder = NULL;
+ set_best_encoder(state, connector_state, NULL);
return 0;
}
@@ -241,6 +285,8 @@
}
if (new_encoder == connector_state->best_encoder) {
+ set_best_encoder(state, connector_state, new_encoder);
+
DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d:%s]\n",
connector->base.id,
connector->name,
@@ -275,7 +321,8 @@
if (WARN_ON(!connector_state->crtc))
return -EINVAL;
- connector_state->best_encoder = new_encoder;
+ set_best_encoder(state, connector_state, new_encoder);
+
idx = drm_crtc_index(connector_state->crtc);
crtc_state = state->crtc_states[idx];