diff options
| -rw-r--r-- | drivers/gpu/drm/drm_atomic.c | 69 | ||||
| -rw-r--r-- | include/drm/drm_atomic.h | 7 | ||||
| -rw-r--r-- | include/drm/drm_connector.h | 5 |
3 files changed, 81 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 169f06d7c5ce..a4e779deab0f 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -847,6 +847,75 @@ drm_atomic_get_new_private_obj_state(struct drm_atomic_state *state, EXPORT_SYMBOL(drm_atomic_get_new_private_obj_state); /** + * drm_atomic_get_old_connector_for_encoder - Get old connector for an encoder + * @state: Atomic state + * @encoder: The encoder to fetch the connector state for + * + * This function finds and returns the connector that was connected to @encoder + * as specified by the @state. + * + * If there is no connector in @state which previously had @encoder connected to + * it, this function will return NULL. While this may seem like an invalid use + * case, it is sometimes useful to differentiate commits which had no prior + * connectors attached to @encoder vs ones that did (and to inspect their + * state). This is especially true in enable hooks because the pipeline has + * changed. + * + * Returns: The old connector connected to @encoder, or NULL if the encoder is + * not connected. + */ +struct drm_connector * +drm_atomic_get_old_connector_for_encoder(struct drm_atomic_state *state, + struct drm_encoder *encoder) +{ + struct drm_connector_state *conn_state; + struct drm_connector *connector; + unsigned int i; + + for_each_old_connector_in_state(state, connector, conn_state, i) { + if (conn_state->best_encoder == encoder) + return connector; + } + + return NULL; +} +EXPORT_SYMBOL(drm_atomic_get_old_connector_for_encoder); + +/** + * drm_atomic_get_new_connector_for_encoder - Get new connector for an encoder + * @state: Atomic state + * @encoder: The encoder to fetch the connector state for + * + * This function finds and returns the connector that will be connected to + * @encoder as specified by the @state. + * + * If there is no connector in @state which will have @encoder connected to it, + * this function will return NULL. While this may seem like an invalid use case, + * it is sometimes useful to differentiate commits which have no connectors + * attached to @encoder vs ones that do (and to inspect their state). This is + * especially true in disable hooks because the pipeline will change. + * + * Returns: The new connector connected to @encoder, or NULL if the encoder is + * not connected. + */ +struct drm_connector * +drm_atomic_get_new_connector_for_encoder(struct drm_atomic_state *state, + struct drm_encoder *encoder) +{ + struct drm_connector_state *conn_state; + struct drm_connector *connector; + unsigned int i; + + for_each_new_connector_in_state(state, connector, conn_state, i) { + if (conn_state->best_encoder == encoder) + return connector; + } + + return NULL; +} +EXPORT_SYMBOL(drm_atomic_get_new_connector_for_encoder); + +/** * drm_atomic_get_connector_state - get connector state * @state: global atomic state object * @connector: connector to get state object for diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h index e937ff2beb04..f12215647801 100644 --- a/include/drm/drm_atomic.h +++ b/include/drm/drm_atomic.h @@ -459,6 +459,13 @@ struct drm_private_state * drm_atomic_get_new_private_obj_state(struct drm_atomic_state *state, struct drm_private_obj *obj); +struct drm_connector * +drm_atomic_get_old_connector_for_encoder(struct drm_atomic_state *state, + struct drm_encoder *encoder); +struct drm_connector * +drm_atomic_get_new_connector_for_encoder(struct drm_atomic_state *state, + struct drm_encoder *encoder); + /** * drm_atomic_get_existing_crtc_state - get crtc state, if it exists * @state: global atomic state object diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 47e749b74e5f..071143bc0ebd 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -518,6 +518,11 @@ struct drm_connector_state { * &drm_connector_helper_funcs.atomic_best_encoder or * &drm_connector_helper_funcs.best_encoder callbacks. * + * This is also used in the atomic helpers to map encoders to their + * current and previous connectors, see + * &drm_atomic_get_old_connector_for_encoder() and + * &drm_atomic_get_new_connector_for_encoder(). + * * NOTE: Atomic drivers must fill this out (either themselves or through * helpers), for otherwise the GETCONNECTOR and GETENCODER IOCTLs will * not return correct data to userspace. |