| /* |
| * Copyright (C) 2014 Red Hat |
| * Copyright (C) 2014 Intel Corp. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| * |
| * Authors: |
| * Rob Clark <robdclark@gmail.com> |
| * Daniel Vetter <daniel.vetter@ffwll.ch> |
| */ |
| |
| #include <drm/drmP.h> |
| #include <drm/drm_atomic.h> |
| #include <drm/drm_plane_helper.h> |
| #include <drm/drm_crtc_helper.h> |
| #include <drm/drm_atomic_helper.h> |
| #include <linux/fence.h> |
| |
| /** |
| * DOC: overview |
| * |
| * This helper library provides implementations of check and commit functions on |
| * top of the CRTC modeset helper callbacks and the plane helper callbacks. It |
| * also provides convenience implementations for the atomic state handling |
| * callbacks for drivers which don't need to subclass the drm core structures to |
| * add their own additional internal state. |
| * |
| * This library also provides default implementations for the check callback in |
| * drm_atomic_helper_check() and for the commit callback with |
| * drm_atomic_helper_commit(). But the individual stages and callbacks are |
| * exposed to allow drivers to mix and match and e.g. use the plane helpers only |
| * together with a driver private modeset implementation. |
| * |
| * This library also provides implementations for all the legacy driver |
| * interfaces on top of the atomic interface. See drm_atomic_helper_set_config(), |
| * drm_atomic_helper_disable_plane(), drm_atomic_helper_disable_plane() and the |
| * various functions to implement set_property callbacks. New drivers must not |
| * implement these functions themselves but must use the provided helpers. |
| * |
| * The atomic helper uses the same function table structures as all other |
| * modesetting helpers. See the documentation for struct &drm_crtc_helper_funcs, |
| * struct &drm_encoder_helper_funcs and struct &drm_connector_helper_funcs. It |
| * also shares the struct &drm_plane_helper_funcs function table with the plane |
| * helpers. |
| */ |
| static void |
| drm_atomic_helper_plane_changed(struct drm_atomic_state *state, |
| struct drm_plane_state *plane_state, |
| struct drm_plane *plane) |
| { |
| struct drm_crtc_state *crtc_state; |
| |
| if (plane->state->crtc) { |
| crtc_state = state->crtc_states[drm_crtc_index(plane->state->crtc)]; |
| |
| if (WARN_ON(!crtc_state)) |
| return; |
| |
| crtc_state->planes_changed = true; |
| } |
| |
| if (plane_state->crtc) { |
| crtc_state = |
| state->crtc_states[drm_crtc_index(plane_state->crtc)]; |
| |
| if (WARN_ON(!crtc_state)) |
| return; |
| |
| crtc_state->planes_changed = true; |
| } |
| } |
| |
| static bool |
| check_pending_encoder_assignment(struct drm_atomic_state *state, |
| struct drm_encoder *new_encoder) |
| { |
| struct drm_connector *connector; |
| struct drm_connector_state *conn_state; |
| int i; |
| |
| for_each_connector_in_state(state, connector, conn_state, i) { |
| if (conn_state->best_encoder != new_encoder) |
| continue; |
| |
| /* encoder already assigned and we're trying to re-steal it! */ |
| if (connector->state->best_encoder != conn_state->best_encoder) |
| return false; |
| } |
| |
| 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 int |
| steal_encoder(struct drm_atomic_state *state, |
| struct drm_encoder *encoder, |
| struct drm_crtc *encoder_crtc) |
| { |
| 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; |
| int ret; |
| |
| /* |
| * 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); |
| |
| 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)) |
| return PTR_ERR(connector_state); |
| |
| ret = drm_atomic_set_crtc_for_connector(connector_state, NULL); |
| if (ret) |
| return ret; |
| connector_state->best_encoder = NULL; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| update_connector_routing(struct drm_atomic_state *state, int conn_idx) |
| { |
| const struct drm_connector_helper_funcs *funcs; |
| struct drm_encoder *new_encoder; |
| struct drm_crtc *encoder_crtc; |
| struct drm_connector *connector; |
| struct drm_connector_state *connector_state; |
| struct drm_crtc_state *crtc_state; |
| int idx, ret; |
| |
| connector = state->connectors[conn_idx]; |
| connector_state = state->connector_states[conn_idx]; |
| |
| if (!connector) |
| return 0; |
| |
| DRM_DEBUG_ATOMIC("Updating routing for [CONNECTOR:%d:%s]\n", |
| connector->base.id, |
| connector->name); |
| |
| if (connector->state->crtc != connector_state->crtc) { |
| if (connector->state->crtc) { |
| idx = drm_crtc_index(connector->state->crtc); |
| |
| crtc_state = state->crtc_states[idx]; |
| crtc_state->connectors_changed = true; |
| } |
| |
| if (connector_state->crtc) { |
| idx = drm_crtc_index(connector_state->crtc); |
| |
| crtc_state = state->crtc_states[idx]; |
| crtc_state->connectors_changed = true; |
| } |
| } |
| |
| if (!connector_state->crtc) { |
| DRM_DEBUG_ATOMIC("Disabling [CONNECTOR:%d:%s]\n", |
| connector->base.id, |
| connector->name); |
| |
| connector_state->best_encoder = NULL; |
| |
| return 0; |
| } |
| |
| funcs = connector->helper_private; |
| |
| if (funcs->atomic_best_encoder) |
| new_encoder = funcs->atomic_best_encoder(connector, |
| connector_state); |
| else |
| new_encoder = funcs->best_encoder(connector); |
| |
| if (!new_encoder) { |
| DRM_DEBUG_ATOMIC("No suitable encoder found for [CONNECTOR:%d:%s]\n", |
| connector->base.id, |
| connector->name); |
| return -EINVAL; |
| } |
| |
| if (!drm_encoder_crtc_ok(new_encoder, connector_state->crtc)) { |
| DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] incompatible with [CRTC:%d]\n", |
| new_encoder->base.id, |
| new_encoder->name, |
| connector_state->crtc->base.id); |
| return -EINVAL; |
| } |
| |
| if (new_encoder == connector_state->best_encoder) { |
| DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d:%s]\n", |
| connector->base.id, |
| connector->name, |
| new_encoder->base.id, |
| new_encoder->name, |
| connector_state->crtc->base.id, |
| connector_state->crtc->name); |
| |
| return 0; |
| } |
| |
| if (!check_pending_encoder_assignment(state, new_encoder)) { |
| DRM_DEBUG_ATOMIC("Encoder for [CONNECTOR:%d:%s] already assigned\n", |
| connector->base.id, |
| connector->name); |
| 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; |
| } |
| } |
| |
| if (WARN_ON(!connector_state->crtc)) |
| return -EINVAL; |
| |
| connector_state->best_encoder = new_encoder; |
| idx = drm_crtc_index(connector_state->crtc); |
| |
| crtc_state = state->crtc_states[idx]; |
| crtc_state->connectors_changed = true; |
| |
| DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d:%s]\n", |
| connector->base.id, |
| connector->name, |
| new_encoder->base.id, |
| new_encoder->name, |
| connector_state->crtc->base.id, |
| connector_state->crtc->name); |
| |
| return 0; |
| } |
| |
| static int |
| mode_fixup(struct drm_atomic_state *state) |
| { |
| struct drm_crtc *crtc; |
| struct drm_crtc_state *crtc_state; |
| struct drm_connector *connector; |
| struct drm_connector_state *conn_state; |
| int i; |
| bool ret; |
| |
| for_each_crtc_in_state(state, crtc, crtc_state, i) { |
| if (!crtc_state->mode_changed && |
| !crtc_state->connectors_changed) |
| continue; |
| |
| drm_mode_copy(&crtc_state->adjusted_mode, &crtc_state->mode); |
| } |
| |
| for_each_connector_in_state(state, connector, conn_state, i) { |
| const struct drm_encoder_helper_funcs *funcs; |
| struct drm_encoder *encoder; |
| |
| WARN_ON(!!conn_state->best_encoder != !!conn_state->crtc); |
| |
| if (!conn_state->crtc || !conn_state->best_encoder) |
| continue; |
| |
| crtc_state = |
| state->crtc_states[drm_crtc_index(conn_state->crtc)]; |
| |
| /* |
| * Each encoder has at most one connector (since we always steal |
| * it away), so we won't call ->mode_fixup twice. |
| */ |
| encoder = conn_state->best_encoder; |
| funcs = encoder->helper_private; |
| if (!funcs) |
| continue; |
| |
| ret = drm_bridge_mode_fixup(encoder->bridge, &crtc_state->mode, |
| &crtc_state->adjusted_mode); |
| if (!ret) { |
| DRM_DEBUG_ATOMIC("Bridge fixup failed\n"); |
| return -EINVAL; |
| } |
| |
| if (funcs->atomic_check) { |
| ret = funcs->atomic_check(encoder, crtc_state, |
| conn_state); |
| if (ret) { |
| DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] check failed\n", |
| encoder->base.id, encoder->name); |
| return ret; |
| } |
| } else if (funcs->mode_fixup) { |
| ret = funcs->mode_fixup(encoder, &crtc_state->mode, |
| &crtc_state->adjusted_mode); |
| if (!ret) { |
| DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] fixup failed\n", |
| encoder->base.id, encoder->name); |
| return -EINVAL; |
| } |
| } |
| } |
| |
| for_each_crtc_in_state(state, crtc, crtc_state, i) { |
| const struct drm_crtc_helper_funcs *funcs; |
| |
| if (!crtc_state->mode_changed && |
| !crtc_state->connectors_changed) |
| continue; |
| |
| funcs = crtc->helper_private; |
| if (!funcs->mode_fixup) |
| continue; |
| |
| ret = funcs->mode_fixup(crtc, &crtc_state->mode, |
| &crtc_state->adjusted_mode); |
| if (!ret) { |
| DRM_DEBUG_ATOMIC("[CRTC:%d:%s] fixup failed\n", |
| crtc->base.id, crtc->name); |
| return -EINVAL; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * drm_atomic_helper_check_modeset - validate state object for modeset changes |
| * @dev: DRM device |
| * @state: the driver state object |
| * |
| * Check the state object to see if the requested state is physically possible. |
| * This does all the crtc and connector related computations for an atomic |
| * update and adds any additional connectors needed for full modesets and calls |
| * down into ->mode_fixup functions of the driver backend. |
| * |
| * crtc_state->mode_changed is set when the input mode is changed. |
| * crtc_state->connectors_changed is set when a connector is added or |
| * removed from the crtc. |
| * crtc_state->active_changed is set when crtc_state->active changes, |
| * which is used for dpms. |
| * |
| * IMPORTANT: |
| * |
| * Drivers which update ->mode_changed (e.g. in their ->atomic_check hooks if a |
| * plane update can't be done without a full modeset) _must_ call this function |
| * afterwards after that change. It is permitted to call this function multiple |
| * times for the same update, e.g. when the ->atomic_check functions depend upon |
| * the adjusted dotclock for fifo space allocation and watermark computation. |
| * |
| * RETURNS |
| * Zero for success or -errno |
| */ |
| int |
| drm_atomic_helper_check_modeset(struct drm_device *dev, |
| struct drm_atomic_state *state) |
| { |
| struct drm_crtc *crtc; |
| struct drm_crtc_state *crtc_state; |
| struct drm_connector *connector; |
| struct drm_connector_state *connector_state; |
| int i, ret; |
| |
| for_each_crtc_in_state(state, crtc, crtc_state, i) { |
| if (!drm_mode_equal(&crtc->state->mode, &crtc_state->mode)) { |
| DRM_DEBUG_ATOMIC("[CRTC:%d:%s] mode changed\n", |
| crtc->base.id, crtc->name); |
| crtc_state->mode_changed = true; |
| } |
| |
| if (crtc->state->enable != crtc_state->enable) { |
| DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enable changed\n", |
| crtc->base.id, crtc->name); |
| |
| /* |
| * For clarity this assignment is done here, but |
| * enable == 0 is only true when there are no |
| * connectors and a NULL mode. |
| * |
| * The other way around is true as well. enable != 0 |
| * iff connectors are attached and a mode is set. |
| */ |
| crtc_state->mode_changed = true; |
| crtc_state->connectors_changed = true; |
| } |
| } |
| |
| for_each_connector_in_state(state, connector, connector_state, i) { |
| /* |
| * This only sets crtc->mode_changed for routing changes, |
| * drivers must set crtc->mode_changed themselves when connector |
| * properties need to be updated. |
| */ |
| ret = update_connector_routing(state, i); |
| if (ret) |
| return ret; |
| } |
| |
| /* |
| * After all the routing has been prepared we need to add in any |
| * connector which is itself unchanged, but who's crtc changes it's |
| * configuration. This must be done before calling mode_fixup in case a |
| * crtc only changed its mode but has the same set of connectors. |
| */ |
| for_each_crtc_in_state(state, crtc, crtc_state, i) { |
| bool has_connectors = |
| !!crtc_state->connector_mask; |
| |
| /* |
| * We must set ->active_changed after walking connectors for |
| * otherwise an update that only changes active would result in |
| * a full modeset because update_connector_routing force that. |
| */ |
| if (crtc->state->active != crtc_state->active) { |
| DRM_DEBUG_ATOMIC("[CRTC:%d:%s] active changed\n", |
| crtc->base.id, crtc->name); |
| crtc_state->active_changed = true; |
| } |
| |
| if (!drm_atomic_crtc_needs_modeset(crtc_state)) |
| continue; |
| |
| DRM_DEBUG_ATOMIC("[CRTC:%d:%s] needs all connectors, enable: %c, active: %c\n", |
| crtc->base.id, crtc->name, |
| crtc_state->enable ? 'y' : 'n', |
| crtc_state->active ? 'y' : 'n'); |
| |
| ret = drm_atomic_add_affected_connectors(state, crtc); |
| if (ret != 0) |
| return ret; |
| |
| ret = drm_atomic_add_affected_planes(state, crtc); |
| if (ret != 0) |
| return ret; |
| |
| if (crtc_state->enable != has_connectors) { |
| DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enabled/connectors mismatch\n", |
| crtc->base.id, crtc->name); |
| |
| return -EINVAL; |
| } |
| } |
| |
| return mode_fixup(state); |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_check_modeset); |
| |
| /** |
| * drm_atomic_helper_check_planes - validate state object for planes changes |
| * @dev: DRM device |
| * @state: the driver state object |
| * |
| * Check the state object to see if the requested state is physically possible. |
| * This does all the plane update related checks using by calling into the |
| * ->atomic_check hooks provided by the driver. |
| * |
| * It also sets crtc_state->planes_changed to indicate that a crtc has |
| * updated planes. |
| * |
| * RETURNS |
| * Zero for success or -errno |
| */ |
| int |
| drm_atomic_helper_check_planes(struct drm_device *dev, |
| struct drm_atomic_state *state) |
| { |
| struct drm_crtc *crtc; |
| struct drm_crtc_state *crtc_state; |
| struct drm_plane *plane; |
| struct drm_plane_state *plane_state; |
| int i, ret = 0; |
| |
| for_each_plane_in_state(state, plane, plane_state, i) { |
| const struct drm_plane_helper_funcs *funcs; |
| |
| funcs = plane->helper_private; |
| |
| drm_atomic_helper_plane_changed(state, plane_state, plane); |
| |
| if (!funcs || !funcs->atomic_check) |
| continue; |
| |
| ret = funcs->atomic_check(plane, plane_state); |
| if (ret) { |
| DRM_DEBUG_ATOMIC("[PLANE:%d:%s] atomic driver check failed\n", |
| plane->base.id, plane->name); |
| return ret; |
| } |
| } |
| |
| for_each_crtc_in_state(state, crtc, crtc_state, i) { |
| const struct drm_crtc_helper_funcs *funcs; |
| |
| funcs = crtc->helper_private; |
| |
| if (!funcs || !funcs->atomic_check) |
| continue; |
| |
| ret = funcs->atomic_check(crtc, state->crtc_states[i]); |
| if (ret) { |
| DRM_DEBUG_ATOMIC("[CRTC:%d:%s] atomic driver check failed\n", |
| crtc->base.id, crtc->name); |
| return ret; |
| } |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_check_planes); |
| |
| /** |
| * drm_atomic_helper_check - validate state object |
| * @dev: DRM device |
| * @state: the driver state object |
| * |
| * Check the state object to see if the requested state is physically possible. |
| * Only crtcs and planes have check callbacks, so for any additional (global) |
| * checking that a driver needs it can simply wrap that around this function. |
| * Drivers without such needs can directly use this as their ->atomic_check() |
| * callback. |
| * |
| * This just wraps the two parts of the state checking for planes and modeset |
| * state in the default order: First it calls drm_atomic_helper_check_modeset() |
| * and then drm_atomic_helper_check_planes(). The assumption is that the |
| * ->atomic_check functions depend upon an updated adjusted_mode.clock to |
| * e.g. properly compute watermarks. |
| * |
| * RETURNS |
| * Zero for success or -errno |
| */ |
| int drm_atomic_helper_check(struct drm_device *dev, |
| struct drm_atomic_state *state) |
| { |
| int ret; |
| |
| ret = drm_atomic_helper_check_modeset(dev, state); |
| if (ret) |
| return ret; |
| |
| ret = drm_atomic_helper_check_planes(dev, state); |
| if (ret) |
| return ret; |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_check); |
| |
| static void |
| disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state) |
| { |
| struct drm_connector *connector; |
| struct drm_connector_state *old_conn_state; |
| struct drm_crtc *crtc; |
| struct drm_crtc_state *old_crtc_state; |
| int i; |
| |
| for_each_connector_in_state(old_state, connector, old_conn_state, i) { |
| const struct drm_encoder_helper_funcs *funcs; |
| struct drm_encoder *encoder; |
| |
| /* Shut down everything that's in the changeset and currently |
| * still on. So need to check the old, saved state. */ |
| if (!old_conn_state->crtc) |
| continue; |
| |
| old_crtc_state = old_state->crtc_states[drm_crtc_index(old_conn_state->crtc)]; |
| |
| if (!old_crtc_state->active || |
| !drm_atomic_crtc_needs_modeset(old_conn_state->crtc->state)) |
| continue; |
| |
| encoder = old_conn_state->best_encoder; |
| |
| /* We shouldn't get this far if we didn't previously have |
| * an encoder.. but WARN_ON() rather than explode. |
| */ |
| if (WARN_ON(!encoder)) |
| continue; |
| |
| funcs = encoder->helper_private; |
| |
| DRM_DEBUG_ATOMIC("disabling [ENCODER:%d:%s]\n", |
| encoder->base.id, encoder->name); |
| |
| /* |
| * Each encoder has at most one connector (since we always steal |
| * it away), so we won't call disable hooks twice. |
| */ |
| drm_bridge_disable(encoder->bridge); |
| |
| /* Right function depends upon target state. */ |
| if (connector->state->crtc && funcs->prepare) |
| funcs->prepare(encoder); |
| else if (funcs->disable) |
| funcs->disable(encoder); |
| else |
| funcs->dpms(encoder, DRM_MODE_DPMS_OFF); |
| |
| drm_bridge_post_disable(encoder->bridge); |
| } |
| |
| for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { |
| const struct drm_crtc_helper_funcs *funcs; |
| |
| /* Shut down everything that needs a full modeset. */ |
| if (!drm_atomic_crtc_needs_modeset(crtc->state)) |
| continue; |
| |
| if (!old_crtc_state->active) |
| continue; |
| |
| funcs = crtc->helper_private; |
| |
| DRM_DEBUG_ATOMIC("disabling [CRTC:%d:%s]\n", |
| crtc->base.id, crtc->name); |
| |
| |
| /* Right function depends upon target state. */ |
| if (crtc->state->enable && funcs->prepare) |
| funcs->prepare(crtc); |
| else if (funcs->disable) |
| funcs->disable(crtc); |
| else |
| funcs->dpms(crtc, DRM_MODE_DPMS_OFF); |
| } |
| } |
| |
| /** |
| * drm_atomic_helper_update_legacy_modeset_state - update legacy modeset state |
| * @dev: DRM device |
| * @old_state: atomic state object with old state structures |
| * |
| * This function updates all the various legacy modeset state pointers in |
| * connectors, encoders and crtcs. It also updates the timestamping constants |
| * used for precise vblank timestamps by calling |
| * drm_calc_timestamping_constants(). |
| * |
| * Drivers can use this for building their own atomic commit if they don't have |
| * a pure helper-based modeset implementation. |
| */ |
| void |
| drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev, |
| struct drm_atomic_state *old_state) |
| { |
| struct drm_connector *connector; |
| struct drm_connector_state *old_conn_state; |
| struct drm_crtc *crtc; |
| struct drm_crtc_state *old_crtc_state; |
| int i; |
| |
| /* clear out existing links and update dpms */ |
| for_each_connector_in_state(old_state, connector, old_conn_state, i) { |
| if (connector->encoder) { |
| WARN_ON(!connector->encoder->crtc); |
| |
| connector->encoder->crtc = NULL; |
| connector->encoder = NULL; |
| } |
| |
| crtc = connector->state->crtc; |
| if ((!crtc && old_conn_state->crtc) || |
| (crtc && drm_atomic_crtc_needs_modeset(crtc->state))) { |
| struct drm_property *dpms_prop = |
| dev->mode_config.dpms_property; |
| int mode = DRM_MODE_DPMS_OFF; |
| |
| if (crtc && crtc->state->active) |
| mode = DRM_MODE_DPMS_ON; |
| |
| connector->dpms = mode; |
| drm_object_property_set_value(&connector->base, |
| dpms_prop, mode); |
| } |
| } |
| |
| /* set new links */ |
| for_each_connector_in_state(old_state, connector, old_conn_state, i) { |
| if (!connector->state->crtc) |
| continue; |
| |
| if (WARN_ON(!connector->state->best_encoder)) |
| continue; |
| |
| connector->encoder = connector->state->best_encoder; |
| connector->encoder->crtc = connector->state->crtc; |
| } |
| |
| /* set legacy state in the crtc structure */ |
| for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { |
| struct drm_plane *primary = crtc->primary; |
| |
| crtc->mode = crtc->state->mode; |
| crtc->enabled = crtc->state->enable; |
| |
| if (drm_atomic_get_existing_plane_state(old_state, primary) && |
| primary->state->crtc == crtc) { |
| crtc->x = primary->state->src_x >> 16; |
| crtc->y = primary->state->src_y >> 16; |
| } |
| |
| if (crtc->state->enable) |
| drm_calc_timestamping_constants(crtc, |
| &crtc->state->adjusted_mode); |
| } |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_update_legacy_modeset_state); |
| |
| static void |
| crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state) |
| { |
| struct drm_crtc *crtc; |
| struct drm_crtc_state *old_crtc_state; |
| struct drm_connector *connector; |
| struct drm_connector_state *old_conn_state; |
| int i; |
| |
| for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { |
| const struct drm_crtc_helper_funcs *funcs; |
| |
| if (!crtc->state->mode_changed) |
| continue; |
| |
| funcs = crtc->helper_private; |
| |
| if (crtc->state->enable && funcs->mode_set_nofb) { |
| DRM_DEBUG_ATOMIC("modeset on [CRTC:%d:%s]\n", |
| crtc->base.id, crtc->name); |
| |
| funcs->mode_set_nofb(crtc); |
| } |
| } |
| |
| for_each_connector_in_state(old_state, connector, old_conn_state, i) { |
| const struct drm_encoder_helper_funcs *funcs; |
| struct drm_crtc_state *new_crtc_state; |
| struct drm_encoder *encoder; |
| struct drm_display_mode *mode, *adjusted_mode; |
| |
| if (!connector->state->best_encoder) |
| continue; |
| |
| encoder = connector->state->best_encoder; |
| funcs = encoder->helper_private; |
| new_crtc_state = connector->state->crtc->state; |
| mode = &new_crtc_state->mode; |
| adjusted_mode = &new_crtc_state->adjusted_mode; |
| |
| if (!new_crtc_state->mode_changed) |
| continue; |
| |
| DRM_DEBUG_ATOMIC("modeset on [ENCODER:%d:%s]\n", |
| encoder->base.id, encoder->name); |
| |
| /* |
| * Each encoder has at most one connector (since we always steal |
| * it away), so we won't call mode_set hooks twice. |
| */ |
| if (funcs->mode_set) |
| funcs->mode_set(encoder, mode, adjusted_mode); |
| |
| drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode); |
| } |
| } |
| |
| /** |
| * drm_atomic_helper_commit_modeset_disables - modeset commit to disable outputs |
| * @dev: DRM device |
| * @old_state: atomic state object with old state structures |
| * |
| * This function shuts down all the outputs that need to be shut down and |
| * prepares them (if required) with the new mode. |
| * |
| * For compatibility with legacy crtc helpers this should be called before |
| * drm_atomic_helper_commit_planes(), which is what the default commit function |
| * does. But drivers with different needs can group the modeset commits together |
| * and do the plane commits at the end. This is useful for drivers doing runtime |
| * PM since planes updates then only happen when the CRTC is actually enabled. |
| */ |
| void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev, |
| struct drm_atomic_state *old_state) |
| { |
| disable_outputs(dev, old_state); |
| |
| drm_atomic_helper_update_legacy_modeset_state(dev, old_state); |
| |
| crtc_set_mode(dev, old_state); |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables); |
| |
| /** |
| * drm_atomic_helper_commit_modeset_enables - modeset commit to enable outputs |
| * @dev: DRM device |
| * @old_state: atomic state object with old state structures |
| * |
| * This function enables all the outputs with the new configuration which had to |
| * be turned off for the update. |
| * |
| * For compatibility with legacy crtc helpers this should be called after |
| * drm_atomic_helper_commit_planes(), which is what the default commit function |
| * does. But drivers with different needs can group the modeset commits together |
| * and do the plane commits at the end. This is useful for drivers doing runtime |
| * PM since planes updates then only happen when the CRTC is actually enabled. |
| */ |
| void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev, |
| struct drm_atomic_state *old_state) |
| { |
| struct drm_crtc *crtc; |
| struct drm_crtc_state *old_crtc_state; |
| struct drm_connector *connector; |
| struct drm_connector_state *old_conn_state; |
| int i; |
| |
| for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { |
| const struct drm_crtc_helper_funcs *funcs; |
| |
| /* Need to filter out CRTCs where only planes change. */ |
| if (!drm_atomic_crtc_needs_modeset(crtc->state)) |
| continue; |
| |
| if (!crtc->state->active) |
| continue; |
| |
| funcs = crtc->helper_private; |
| |
| if (crtc->state->enable) { |
| DRM_DEBUG_ATOMIC("enabling [CRTC:%d:%s]\n", |
| crtc->base.id, crtc->name); |
| |
| if (funcs->enable) |
| funcs->enable(crtc); |
| else |
| funcs->commit(crtc); |
| } |
| } |
| |
| for_each_connector_in_state(old_state, connector, old_conn_state, i) { |
| const struct drm_encoder_helper_funcs *funcs; |
| struct drm_encoder *encoder; |
| |
| if (!connector->state->best_encoder) |
| continue; |
| |
| if (!connector->state->crtc->state->active || |
| !drm_atomic_crtc_needs_modeset(connector->state->crtc->state)) |
| continue; |
| |
| encoder = connector->state->best_encoder; |
| funcs = encoder->helper_private; |
| |
| DRM_DEBUG_ATOMIC("enabling [ENCODER:%d:%s]\n", |
| encoder->base.id, encoder->name); |
| |
| /* |
| * Each encoder has at most one connector (since we always steal |
| * it away), so we won't call enable hooks twice. |
| */ |
| drm_bridge_pre_enable(encoder->bridge); |
| |
| if (funcs->enable) |
| funcs->enable(encoder); |
| else |
| funcs->commit(encoder); |
| |
| drm_bridge_enable(encoder->bridge); |
| } |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables); |
| |
| static void wait_for_fences(struct drm_device *dev, |
| struct drm_atomic_state *state) |
| { |
| struct drm_plane *plane; |
| struct drm_plane_state *plane_state; |
| int i; |
| |
| for_each_plane_in_state(state, plane, plane_state, i) { |
| if (!plane->state->fence) |
| continue; |
| |
| WARN_ON(!plane->state->fb); |
| |
| fence_wait(plane->state->fence, false); |
| fence_put(plane->state->fence); |
| plane->state->fence = NULL; |
| } |
| } |
| |
| /** |
| * drm_atomic_helper_framebuffer_changed - check if framebuffer has changed |
| * @dev: DRM device |
| * @old_state: atomic state object with old state structures |
| * @crtc: DRM crtc |
| * |
| * Checks whether the framebuffer used for this CRTC changes as a result of |
| * the atomic update. This is useful for drivers which cannot use |
| * drm_atomic_helper_wait_for_vblanks() and need to reimplement its |
| * functionality. |
| * |
| * Returns: |
| * true if the framebuffer changed. |
| */ |
| bool drm_atomic_helper_framebuffer_changed(struct drm_device *dev, |
| struct drm_atomic_state *old_state, |
| struct drm_crtc *crtc) |
| { |
| struct drm_plane *plane; |
| struct drm_plane_state *old_plane_state; |
| int i; |
| |
| for_each_plane_in_state(old_state, plane, old_plane_state, i) { |
| if (plane->state->crtc != crtc && |
| old_plane_state->crtc != crtc) |
| continue; |
| |
| if (plane->state->fb != old_plane_state->fb) |
| return true; |
| } |
| |
| return false; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_framebuffer_changed); |
| |
| /** |
| * drm_atomic_helper_wait_for_vblanks - wait for vblank on crtcs |
| * @dev: DRM device |
| * @old_state: atomic state object with old state structures |
| * |
| * Helper to, after atomic commit, wait for vblanks on all effected |
| * crtcs (ie. before cleaning up old framebuffers using |
| * drm_atomic_helper_cleanup_planes()). It will only wait on crtcs where the |
| * framebuffers have actually changed to optimize for the legacy cursor and |
| * plane update use-case. |
| */ |
| void |
| drm_atomic_helper_wait_for_vblanks(struct drm_device *dev, |
| struct drm_atomic_state *old_state) |
| { |
| struct drm_crtc *crtc; |
| struct drm_crtc_state *old_crtc_state; |
| int i, ret; |
| |
| for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { |
| /* No one cares about the old state, so abuse it for tracking |
| * and store whether we hold a vblank reference (and should do a |
| * vblank wait) in the ->enable boolean. */ |
| old_crtc_state->enable = false; |
| |
| if (!crtc->state->enable) |
| continue; |
| |
| /* Legacy cursor ioctls are completely unsynced, and userspace |
| * relies on that (by doing tons of cursor updates). */ |
| if (old_state->legacy_cursor_update) |
| continue; |
| |
| if (!drm_atomic_helper_framebuffer_changed(dev, |
| old_state, crtc)) |
| continue; |
| |
| ret = drm_crtc_vblank_get(crtc); |
| if (ret != 0) |
| continue; |
| |
| old_crtc_state->enable = true; |
| old_crtc_state->last_vblank_count = drm_crtc_vblank_count(crtc); |
| } |
| |
| for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { |
| if (!old_crtc_state->enable) |
| continue; |
| |
| ret = wait_event_timeout(dev->vblank[i].queue, |
| old_crtc_state->last_vblank_count != |
| drm_crtc_vblank_count(crtc), |
| msecs_to_jiffies(50)); |
| |
| drm_crtc_vblank_put(crtc); |
| } |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks); |
| |
| /** |
| * drm_atomic_helper_commit - commit validated state object |
| * @dev: DRM device |
| * @state: the driver state object |
| * @async: asynchronous commit |
| * |
| * This function commits a with drm_atomic_helper_check() pre-validated state |
| * object. This can still fail when e.g. the framebuffer reservation fails. For |
| * now this doesn't implement asynchronous commits. |
| * |
| * Note that right now this function does not support async commits, and hence |
| * driver writers must implement their own version for now. Also note that the |
| * default ordering of how the various stages are called is to match the legacy |
| * modeset helper library closest. One peculiarity of that is that it doesn't |
| * mesh well with runtime PM at all. |
| * |
| * For drivers supporting runtime PM the recommended sequence is |
| * |
| * drm_atomic_helper_commit_modeset_disables(dev, state); |
| * |
| * drm_atomic_helper_commit_modeset_enables(dev, state); |
| * |
| * drm_atomic_helper_commit_planes(dev, state, true); |
| * |
| * See the kerneldoc entries for these three functions for more details. |
| * |
| * RETURNS |
| * Zero for success or -errno. |
| */ |
| int drm_atomic_helper_commit(struct drm_device *dev, |
| struct drm_atomic_state *state, |
| bool async) |
| { |
| int ret; |
| |
| if (async) |
| return -EBUSY; |
| |
| ret = drm_atomic_helper_prepare_planes(dev, state); |
| if (ret) |
| return ret; |
| |
| /* |
| * This is the point of no return - everything below never fails except |
| * when the hw goes bonghits. Which means we can commit the new state on |
| * the software side now. |
| */ |
| |
| drm_atomic_helper_swap_state(dev, state); |
| |
| /* |
| * Everything below can be run asynchronously without the need to grab |
| * any modeset locks at all under one condition: It must be guaranteed |
| * that the asynchronous work has either been cancelled (if the driver |
| * supports it, which at least requires that the framebuffers get |
| * cleaned up with drm_atomic_helper_cleanup_planes()) or completed |
| * before the new state gets committed on the software side with |
| * drm_atomic_helper_swap_state(). |
| * |
| * This scheme allows new atomic state updates to be prepared and |
| * checked in parallel to the asynchronous completion of the previous |
| * update. Which is important since compositors need to figure out the |
| * composition of the next frame right after having submitted the |
| * current layout. |
| */ |
| |
| wait_for_fences(dev, state); |
| |
| drm_atomic_helper_commit_modeset_disables(dev, state); |
| |
| drm_atomic_helper_commit_planes(dev, state, false); |
| |
| drm_atomic_helper_commit_modeset_enables(dev, state); |
| |
| drm_atomic_helper_wait_for_vblanks(dev, state); |
| |
| drm_atomic_helper_cleanup_planes(dev, state); |
| |
| drm_atomic_state_free(state); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_commit); |
| |
| /** |
| * DOC: implementing async commit |
| * |
| * For now the atomic helpers don't support async commit directly. If there is |
| * real need it could be added though, using the dma-buf fence infrastructure |
| * for generic synchronization with outstanding rendering. |
| * |
| * For now drivers have to implement async commit themselves, with the following |
| * sequence being the recommended one: |
| * |
| * 1. Run drm_atomic_helper_prepare_planes() first. This is the only function |
| * which commit needs to call which can fail, so we want to run it first and |
| * synchronously. |
| * |
| * 2. Synchronize with any outstanding asynchronous commit worker threads which |
| * might be affected the new state update. This can be done by either cancelling |
| * or flushing the work items, depending upon whether the driver can deal with |
| * cancelled updates. Note that it is important to ensure that the framebuffer |
| * cleanup is still done when cancelling. |
| * |
| * For sufficient parallelism it is recommended to have a work item per crtc |
| * (for updates which don't touch global state) and a global one. Then we only |
| * need to synchronize with the crtc work items for changed crtcs and the global |
| * work item, which allows nice concurrent updates on disjoint sets of crtcs. |
| * |
| * 3. The software state is updated synchronously with |
| * drm_atomic_helper_swap_state(). Doing this under the protection of all modeset |
| * locks means concurrent callers never see inconsistent state. And doing this |
| * while it's guaranteed that no relevant async worker runs means that async |
| * workers do not need grab any locks. Actually they must not grab locks, for |
| * otherwise the work flushing will deadlock. |
| * |
| * 4. Schedule a work item to do all subsequent steps, using the split-out |
| * commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and |
| * then cleaning up the framebuffers after the old framebuffer is no longer |
| * being displayed. |
| */ |
| |
| /** |
| * drm_atomic_helper_prepare_planes - prepare plane resources before commit |
| * @dev: DRM device |
| * @state: atomic state object with new state structures |
| * |
| * This function prepares plane state, specifically framebuffers, for the new |
| * configuration. If any failure is encountered this function will call |
| * ->cleanup_fb on any already successfully prepared framebuffer. |
| * |
| * Returns: |
| * 0 on success, negative error code on failure. |
| */ |
| int drm_atomic_helper_prepare_planes(struct drm_device *dev, |
| struct drm_atomic_state *state) |
| { |
| int nplanes = dev->mode_config.num_total_plane; |
| int ret, i; |
| |
| for (i = 0; i < nplanes; i++) { |
| const struct drm_plane_helper_funcs *funcs; |
| struct drm_plane *plane = state->planes[i]; |
| struct drm_plane_state *plane_state = state->plane_states[i]; |
| |
| if (!plane) |
| continue; |
| |
| funcs = plane->helper_private; |
| |
| if (funcs->prepare_fb) { |
| ret = funcs->prepare_fb(plane, plane_state); |
| if (ret) |
| goto fail; |
| } |
| } |
| |
| return 0; |
| |
| fail: |
| for (i--; i >= 0; i--) { |
| const struct drm_plane_helper_funcs *funcs; |
| struct drm_plane *plane = state->planes[i]; |
| struct drm_plane_state *plane_state = state->plane_states[i]; |
| |
| if (!plane) |
| continue; |
| |
| funcs = plane->helper_private; |
| |
| if (funcs->cleanup_fb) |
| funcs->cleanup_fb(plane, plane_state); |
| |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_prepare_planes); |
| |
| bool plane_crtc_active(struct drm_plane_state *state) |
| { |
| return state->crtc && state->crtc->state->active; |
| } |
| |
| /** |
| * drm_atomic_helper_commit_planes - commit plane state |
| * @dev: DRM device |
| * @old_state: atomic state object with old state structures |
| * @active_only: Only commit on active CRTC if set |
| * |
| * This function commits the new plane state using the plane and atomic helper |
| * functions for planes and crtcs. It assumes that the atomic state has already |
| * been pushed into the relevant object state pointers, since this step can no |
| * longer fail. |
| * |
| * It still requires the global state object @old_state to know which planes and |
| * crtcs need to be updated though. |
| * |
| * Note that this function does all plane updates across all CRTCs in one step. |
| * If the hardware can't support this approach look at |
| * drm_atomic_helper_commit_planes_on_crtc() instead. |
| * |
| * Plane parameters can be updated by applications while the associated CRTC is |
| * disabled. The DRM/KMS core will store the parameters in the plane state, |
| * which will be available to the driver when the CRTC is turned on. As a result |
| * most drivers don't need to be immediately notified of plane updates for a |
| * disabled CRTC. |
| * |
| * Unless otherwise needed, drivers are advised to set the @active_only |
| * parameters to true in order not to receive plane update notifications related |
| * to a disabled CRTC. This avoids the need to manually ignore plane updates in |
| * driver code when the driver and/or hardware can't or just don't need to deal |
| * with updates on disabled CRTCs, for example when supporting runtime PM. |
| * |
| * The drm_atomic_helper_commit() default implementation only sets @active_only |
| * to false to most closely match the behaviour of the legacy helpers. This should |
| * not be copied blindly by drivers. |
| */ |
| void drm_atomic_helper_commit_planes(struct drm_device *dev, |
| struct drm_atomic_state *old_state, |
| bool active_only) |
| { |
| struct drm_crtc *crtc; |
| struct drm_crtc_state *old_crtc_state; |
| struct drm_plane *plane; |
| struct drm_plane_state *old_plane_state; |
| int i; |
| |
| for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { |
| const struct drm_crtc_helper_funcs *funcs; |
| |
| funcs = crtc->helper_private; |
| |
| if (!funcs || !funcs->atomic_begin) |
| continue; |
| |
| if (active_only && !crtc->state->active) |
| continue; |
| |
| funcs->atomic_begin(crtc, old_crtc_state); |
| } |
| |
| for_each_plane_in_state(old_state, plane, old_plane_state, i) { |
| const struct drm_plane_helper_funcs *funcs; |
| bool disabling; |
| |
| funcs = plane->helper_private; |
| |
| if (!funcs) |
| continue; |
| |
| disabling = drm_atomic_plane_disabling(plane, old_plane_state); |
| |
| if (active_only) { |
| /* |
| * Skip planes related to inactive CRTCs. If the plane |
| * is enabled use the state of the current CRTC. If the |
| * plane is being disabled use the state of the old |
| * CRTC to avoid skipping planes being disabled on an |
| * active CRTC. |
| */ |
| if (!disabling && !plane_crtc_active(plane->state)) |
| continue; |
| if (disabling && !plane_crtc_active(old_plane_state)) |
| continue; |
| } |
| |
| /* |
| * Special-case disabling the plane if drivers support it. |
| */ |
| if (disabling && funcs->atomic_disable) |
| funcs->atomic_disable(plane, old_plane_state); |
| else if (plane->state->crtc || disabling) |
| funcs->atomic_update(plane, old_plane_state); |
| } |
| |
| for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { |
| const struct drm_crtc_helper_funcs *funcs; |
| |
| funcs = crtc->helper_private; |
| |
| if (!funcs || !funcs->atomic_flush) |
| continue; |
| |
| if (active_only && !crtc->state->active) |
| continue; |
| |
| funcs->atomic_flush(crtc, old_crtc_state); |
| } |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_commit_planes); |
| |
| /** |
| * drm_atomic_helper_commit_planes_on_crtc - commit plane state for a crtc |
| * @old_crtc_state: atomic state object with the old crtc state |
| * |
| * This function commits the new plane state using the plane and atomic helper |
| * functions for planes on the specific crtc. It assumes that the atomic state |
| * has already been pushed into the relevant object state pointers, since this |
| * step can no longer fail. |
| * |
| * This function is useful when plane updates should be done crtc-by-crtc |
| * instead of one global step like drm_atomic_helper_commit_planes() does. |
| * |
| * This function can only be savely used when planes are not allowed to move |
| * between different CRTCs because this function doesn't handle inter-CRTC |
| * depencies. Callers need to ensure that either no such depencies exist, |
| * resolve them through ordering of commit calls or through some other means. |
| */ |
| void |
| drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state) |
| { |
| const struct drm_crtc_helper_funcs *crtc_funcs; |
| struct drm_crtc *crtc = old_crtc_state->crtc; |
| struct drm_atomic_state *old_state = old_crtc_state->state; |
| struct drm_plane *plane; |
| unsigned plane_mask; |
| |
| plane_mask = old_crtc_state->plane_mask; |
| plane_mask |= crtc->state->plane_mask; |
| |
| crtc_funcs = crtc->helper_private; |
| if (crtc_funcs && crtc_funcs->atomic_begin) |
| crtc_funcs->atomic_begin(crtc, old_crtc_state); |
| |
| drm_for_each_plane_mask(plane, crtc->dev, plane_mask) { |
| struct drm_plane_state *old_plane_state = |
| drm_atomic_get_existing_plane_state(old_state, plane); |
| const struct drm_plane_helper_funcs *plane_funcs; |
| |
| plane_funcs = plane->helper_private; |
| |
| if (!old_plane_state || !plane_funcs) |
| continue; |
| |
| WARN_ON(plane->state->crtc && plane->state->crtc != crtc); |
| |
| if (drm_atomic_plane_disabling(plane, old_plane_state) && |
| plane_funcs->atomic_disable) |
| plane_funcs->atomic_disable(plane, old_plane_state); |
| else if (plane->state->crtc || |
| drm_atomic_plane_disabling(plane, old_plane_state)) |
| plane_funcs->atomic_update(plane, old_plane_state); |
| } |
| |
| if (crtc_funcs && crtc_funcs->atomic_flush) |
| crtc_funcs->atomic_flush(crtc, old_crtc_state); |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_commit_planes_on_crtc); |
| |
| /** |
| * drm_atomic_helper_disable_planes_on_crtc - helper to disable CRTC's planes |
| * @crtc: CRTC |
| * @atomic: if set, synchronize with CRTC's atomic_begin/flush hooks |
| * |
| * Disables all planes associated with the given CRTC. This can be |
| * used for instance in the CRTC helper disable callback to disable |
| * all planes before shutting down the display pipeline. |
| * |
| * If the atomic-parameter is set the function calls the CRTC's |
| * atomic_begin hook before and atomic_flush hook after disabling the |
| * planes. |
| * |
| * It is a bug to call this function without having implemented the |
| * ->atomic_disable() plane hook. |
| */ |
| void drm_atomic_helper_disable_planes_on_crtc(struct drm_crtc *crtc, |
| bool atomic) |
| { |
| const struct drm_crtc_helper_funcs *crtc_funcs = |
| crtc->helper_private; |
| struct drm_plane *plane; |
| |
| if (atomic && crtc_funcs && crtc_funcs->atomic_begin) |
| crtc_funcs->atomic_begin(crtc, NULL); |
| |
| drm_for_each_plane(plane, crtc->dev) { |
| const struct drm_plane_helper_funcs *plane_funcs = |
| plane->helper_private; |
| |
| if (plane->state->crtc != crtc || !plane_funcs) |
| continue; |
| |
| WARN_ON(!plane_funcs->atomic_disable); |
| if (plane_funcs->atomic_disable) |
| plane_funcs->atomic_disable(plane, NULL); |
| } |
| |
| if (atomic && crtc_funcs && crtc_funcs->atomic_flush) |
| crtc_funcs->atomic_flush(crtc, NULL); |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_disable_planes_on_crtc); |
| |
| /** |
| * drm_atomic_helper_cleanup_planes - cleanup plane resources after commit |
| * @dev: DRM device |
| * @old_state: atomic state object with old state structures |
| * |
| * This function cleans up plane state, specifically framebuffers, from the old |
| * configuration. Hence the old configuration must be perserved in @old_state to |
| * be able to call this function. |
| * |
| * This function must also be called on the new state when the atomic update |
| * fails at any point after calling drm_atomic_helper_prepare_planes(). |
| */ |
| void drm_atomic_helper_cleanup_planes(struct drm_device *dev, |
| struct drm_atomic_state *old_state) |
| { |
| struct drm_plane *plane; |
| struct drm_plane_state *plane_state; |
| int i; |
| |
| for_each_plane_in_state(old_state, plane, plane_state, i) { |
| const struct drm_plane_helper_funcs *funcs; |
| |
| funcs = plane->helper_private; |
| |
| if (funcs->cleanup_fb) |
| funcs->cleanup_fb(plane, plane_state); |
| } |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes); |
| |
| /** |
| * drm_atomic_helper_swap_state - store atomic state into current sw state |
| * @dev: DRM device |
| * @state: atomic state |
| * |
| * This function stores the atomic state into the current state pointers in all |
| * driver objects. It should be called after all failing steps have been done |
| * and succeeded, but before the actual hardware state is committed. |
| * |
| * For cleanup and error recovery the current state for all changed objects will |
| * be swaped into @state. |
| * |
| * With that sequence it fits perfectly into the plane prepare/cleanup sequence: |
| * |
| * 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state. |
| * |
| * 2. Do any other steps that might fail. |
| * |
| * 3. Put the staged state into the current state pointers with this function. |
| * |
| * 4. Actually commit the hardware state. |
| * |
| * 5. Call drm_atomic_helper_cleanup_planes() with @state, which since step 3 |
| * contains the old state. Also do any other cleanup required with that state. |
| */ |
| void drm_atomic_helper_swap_state(struct drm_device *dev, |
| struct drm_atomic_state *state) |
| { |
| int i; |
| |
| for (i = 0; i < dev->mode_config.num_connector; i++) { |
| struct drm_connector *connector = state->connectors[i]; |
| |
| if (!connector) |
| continue; |
| |
| connector->state->state = state; |
| swap(state->connector_states[i], connector->state); |
| connector->state->state = NULL; |
| } |
| |
| for (i = 0; i < dev->mode_config.num_crtc; i++) { |
| struct drm_crtc *crtc = state->crtcs[i]; |
| |
| if (!crtc) |
| continue; |
| |
| crtc->state->state = state; |
| swap(state->crtc_states[i], crtc->state); |
| crtc->state->state = NULL; |
| } |
| |
| for (i = 0; i < dev->mode_config.num_total_plane; i++) { |
| struct drm_plane *plane = state->planes[i]; |
| |
| if (!plane) |
| continue; |
| |
| plane->state->state = state; |
| swap(state->plane_states[i], plane->state); |
| plane->state->state = NULL; |
| } |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_swap_state); |
| |
| /** |
| * drm_atomic_helper_update_plane - Helper for primary plane update using atomic |
| * @plane: plane object to update |
| * @crtc: owning CRTC of owning plane |
| * @fb: framebuffer to flip onto plane |
| * @crtc_x: x offset of primary plane on crtc |
| * @crtc_y: y offset of primary plane on crtc |
| * @crtc_w: width of primary plane rectangle on crtc |
| * @crtc_h: height of primary plane rectangle on crtc |
| * @src_x: x offset of @fb for panning |
| * @src_y: y offset of @fb for panning |
| * @src_w: width of source rectangle in @fb |
| * @src_h: height of source rectangle in @fb |
| * |
| * Provides a default plane update handler using the atomic driver interface. |
| * |
| * RETURNS: |
| * Zero on success, error code on failure |
| */ |
| int drm_atomic_helper_update_plane(struct drm_plane *plane, |
| struct drm_crtc *crtc, |
| struct drm_framebuffer *fb, |
| int crtc_x, int crtc_y, |
| unsigned int crtc_w, unsigned int crtc_h, |
| uint32_t src_x, uint32_t src_y, |
| uint32_t src_w, uint32_t src_h) |
| { |
| struct drm_atomic_state *state; |
| struct drm_plane_state *plane_state; |
| int ret = 0; |
| |
| state = drm_atomic_state_alloc(plane->dev); |
| if (!state) |
| return -ENOMEM; |
| |
| state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc); |
| retry: |
| plane_state = drm_atomic_get_plane_state(state, plane); |
| if (IS_ERR(plane_state)) { |
| ret = PTR_ERR(plane_state); |
| goto fail; |
| } |
| |
| ret = drm_atomic_set_crtc_for_plane(plane_state, crtc); |
| if (ret != 0) |
| goto fail; |
| drm_atomic_set_fb_for_plane(plane_state, fb); |
| plane_state->crtc_x = crtc_x; |
| plane_state->crtc_y = crtc_y; |
| plane_state->crtc_w = crtc_w; |
| plane_state->crtc_h = crtc_h; |
| plane_state->src_x = src_x; |
| plane_state->src_y = src_y; |
| plane_state->src_w = src_w; |
| plane_state->src_h = src_h; |
| |
| if (plane == crtc->cursor) |
| state->legacy_cursor_update = true; |
| |
| ret = drm_atomic_commit(state); |
| if (ret != 0) |
| goto fail; |
| |
| /* Driver takes ownership of state on successful commit. */ |
| return 0; |
| fail: |
| if (ret == -EDEADLK) |
| goto backoff; |
| |
| drm_atomic_state_free(state); |
| |
| return ret; |
| backoff: |
| drm_atomic_state_clear(state); |
| drm_atomic_legacy_backoff(state); |
| |
| /* |
| * Someone might have exchanged the framebuffer while we dropped locks |
| * in the backoff code. We need to fix up the fb refcount tracking the |
| * core does for us. |
| */ |
| plane->old_fb = plane->fb; |
| |
| goto retry; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_update_plane); |
| |
| /** |
| * drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic |
| * @plane: plane to disable |
| * |
| * Provides a default plane disable handler using the atomic driver interface. |
| * |
| * RETURNS: |
| * Zero on success, error code on failure |
| */ |
| int drm_atomic_helper_disable_plane(struct drm_plane *plane) |
| { |
| struct drm_atomic_state *state; |
| struct drm_plane_state *plane_state; |
| int ret = 0; |
| |
| /* |
| * FIXME: Without plane->crtc set we can't get at the implicit legacy |
| * acquire context. The real fix will be to wire the acquire ctx through |
| * everywhere we need it, but meanwhile prevent chaos by just skipping |
| * this noop. The critical case is the cursor ioctls which a) only grab |
| * crtc/cursor-plane locks (so we need the crtc to get at the right |
| * acquire context) and b) can try to disable the plane multiple times. |
| */ |
| if (!plane->crtc) |
| return 0; |
| |
| state = drm_atomic_state_alloc(plane->dev); |
| if (!state) |
| return -ENOMEM; |
| |
| state->acquire_ctx = drm_modeset_legacy_acquire_ctx(plane->crtc); |
| retry: |
| plane_state = drm_atomic_get_plane_state(state, plane); |
| if (IS_ERR(plane_state)) { |
| ret = PTR_ERR(plane_state); |
| goto fail; |
| } |
| |
| if (plane_state->crtc && (plane == plane->crtc->cursor)) |
| plane_state->state->legacy_cursor_update = true; |
| |
| ret = __drm_atomic_helper_disable_plane(plane, plane_state); |
| if (ret != 0) |
| goto fail; |
| |
| ret = drm_atomic_commit(state); |
| if (ret != 0) |
| goto fail; |
| |
| /* Driver takes ownership of state on successful commit. */ |
| return 0; |
| fail: |
| if (ret == -EDEADLK) |
| goto backoff; |
| |
| drm_atomic_state_free(state); |
| |
| return ret; |
| backoff: |
| drm_atomic_state_clear(state); |
| drm_atomic_legacy_backoff(state); |
| |
| /* |
| * Someone might have exchanged the framebuffer while we dropped locks |
| * in the backoff code. We need to fix up the fb refcount tracking the |
| * core does for us. |
| */ |
| plane->old_fb = plane->fb; |
| |
| goto retry; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_disable_plane); |
| |
| /* just used from fb-helper and atomic-helper: */ |
| int __drm_atomic_helper_disable_plane(struct drm_plane *plane, |
| struct drm_plane_state *plane_state) |
| { |
| int ret; |
| |
| ret = drm_atomic_set_crtc_for_plane(plane_state, NULL); |
| if (ret != 0) |
| return ret; |
| |
| drm_atomic_set_fb_for_plane(plane_state, NULL); |
| plane_state->crtc_x = 0; |
| plane_state->crtc_y = 0; |
| plane_state->crtc_w = 0; |
| plane_state->crtc_h = 0; |
| plane_state->src_x = 0; |
| plane_state->src_y = 0; |
| plane_state->src_w = 0; |
| plane_state->src_h = 0; |
| |
| return 0; |
| } |
| |
| static int update_output_state(struct drm_atomic_state *state, |
| struct drm_mode_set *set) |
| { |
| struct drm_device *dev = set->crtc->dev; |
| struct drm_crtc *crtc; |
| struct drm_crtc_state *crtc_state; |
| struct drm_connector *connector; |
| struct drm_connector_state *conn_state; |
| int ret, i, j; |
| |
| ret = drm_modeset_lock(&dev->mode_config.connection_mutex, |
| state->acquire_ctx); |
| if (ret) |
| return ret; |
| |
| /* First grab all affected connector/crtc states. */ |
| for (i = 0; i < set->num_connectors; i++) { |
| conn_state = drm_atomic_get_connector_state(state, |
| set->connectors[i]); |
| if (IS_ERR(conn_state)) |
| return PTR_ERR(conn_state); |
| } |
| |
| for_each_crtc_in_state(state, crtc, crtc_state, i) { |
| ret = drm_atomic_add_affected_connectors(state, crtc); |
| if (ret) |
| return ret; |
| } |
| |
| /* Then recompute connector->crtc links and crtc enabling state. */ |
| for_each_connector_in_state(state, connector, conn_state, i) { |
| if (conn_state->crtc == set->crtc) { |
| ret = drm_atomic_set_crtc_for_connector(conn_state, |
| NULL); |
| if (ret) |
| return ret; |
| } |
| |
| for (j = 0; j < set->num_connectors; j++) { |
| if (set->connectors[j] == connector) { |
| ret = drm_atomic_set_crtc_for_connector(conn_state, |
| set->crtc); |
| if (ret) |
| return ret; |
| break; |
| } |
| } |
| } |
| |
| for_each_crtc_in_state(state, crtc, crtc_state, i) { |
| /* Don't update ->enable for the CRTC in the set_config request, |
| * since a mismatch would indicate a bug in the upper layers. |
| * The actual modeset code later on will catch any |
| * inconsistencies here. */ |
| if (crtc == set->crtc) |
| continue; |
| |
| if (!crtc_state->connector_mask) { |
| ret = drm_atomic_set_mode_prop_for_crtc(crtc_state, |
| NULL); |
| if (ret < 0) |
| return ret; |
| |
| crtc_state->active = false; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * drm_atomic_helper_set_config - set a new config from userspace |
| * @set: mode set configuration |
| * |
| * Provides a default crtc set_config handler using the atomic driver interface. |
| * |
| * Returns: |
| * Returns 0 on success, negative errno numbers on failure. |
| */ |
| int drm_atomic_helper_set_config(struct drm_mode_set *set) |
| { |
| struct drm_atomic_state *state; |
| struct drm_crtc *crtc = set->crtc; |
| int ret = 0; |
| |
| state = drm_atomic_state_alloc(crtc->dev); |
| if (!state) |
| return -ENOMEM; |
| |
| state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc); |
| retry: |
| ret = __drm_atomic_helper_set_config(set, state); |
| if (ret != 0) |
| goto fail; |
| |
| ret = drm_atomic_commit(state); |
| if (ret != 0) |
| goto fail; |
| |
| /* Driver takes ownership of state on successful commit. */ |
| return 0; |
| fail: |
| if (ret == -EDEADLK) |
| goto backoff; |
| |
| drm_atomic_state_free(state); |
| |
| return ret; |
| backoff: |
| drm_atomic_state_clear(state); |
| drm_atomic_legacy_backoff(state); |
| |
| /* |
| * Someone might have exchanged the framebuffer while we dropped locks |
| * in the backoff code. We need to fix up the fb refcount tracking the |
| * core does for us. |
| */ |
| crtc->primary->old_fb = crtc->primary->fb; |
| |
| goto retry; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_set_config); |
| |
| /* just used from fb-helper and atomic-helper: */ |
| int __drm_atomic_helper_set_config(struct drm_mode_set *set, |
| struct drm_atomic_state *state) |
| { |
| struct drm_crtc_state *crtc_state; |
| struct drm_plane_state *primary_state; |
| struct drm_crtc *crtc = set->crtc; |
| int hdisplay, vdisplay; |
| int ret; |
| |
| crtc_state = drm_atomic_get_crtc_state(state, crtc); |
| if (IS_ERR(crtc_state)) |
| return PTR_ERR(crtc_state); |
| |
| primary_state = drm_atomic_get_plane_state(state, crtc->primary); |
| if (IS_ERR(primary_state)) |
| return PTR_ERR(primary_state); |
| |
| if (!set->mode) { |
| WARN_ON(set->fb); |
| WARN_ON(set->num_connectors); |
| |
| ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL); |
| if (ret != 0) |
| return ret; |
| |
| crtc_state->active = false; |
| |
| ret = drm_atomic_set_crtc_for_plane(primary_state, NULL); |
| if (ret != 0) |
| return ret; |
| |
| drm_atomic_set_fb_for_plane(primary_state, NULL); |
| |
| goto commit; |
| } |
| |
| WARN_ON(!set->fb); |
| WARN_ON(!set->num_connectors); |
| |
| ret = drm_atomic_set_mode_for_crtc(crtc_state, set->mode); |
| if (ret != 0) |
| return ret; |
| |
| crtc_state->active = true; |
| |
| ret = drm_atomic_set_crtc_for_plane(primary_state, crtc); |
| if (ret != 0) |
| return ret; |
| |
| drm_crtc_get_hv_timing(set->mode, &hdisplay, &vdisplay); |
| |
| drm_atomic_set_fb_for_plane(primary_state, set->fb); |
| primary_state->crtc_x = 0; |
| primary_state->crtc_y = 0; |
| primary_state->crtc_w = hdisplay; |
| primary_state->crtc_h = vdisplay; |
| primary_state->src_x = set->x << 16; |
| primary_state->src_y = set->y << 16; |
| if (primary_state->rotation & (BIT(DRM_ROTATE_90) | BIT(DRM_ROTATE_270))) { |
| primary_state->src_w = vdisplay << 16; |
| primary_state->src_h = hdisplay << 16; |
| } else { |
| primary_state->src_w = hdisplay << 16; |
| primary_state->src_h = vdisplay << 16; |
| } |
| |
| commit: |
| ret = update_output_state(state, set); |
| if (ret) |
| return ret; |
| |
| return 0; |
| } |
| |
| /** |
| * drm_atomic_helper_disable_all - disable all currently active outputs |
| * @dev: DRM device |
| * @ctx: lock acquisition context |
| * |
| * Loops through all connectors, finding those that aren't turned off and then |
| * turns them off by setting their DPMS mode to OFF and deactivating the CRTC |
| * that they are connected to. |
| * |
| * This is used for example in suspend/resume to disable all currently active |
| * functions when suspending. |
| * |
| * Note that if callers haven't already acquired all modeset locks this might |
| * return -EDEADLK, which must be handled by calling drm_modeset_backoff(). |
| * |
| * Returns: |
| * 0 on success or a negative error code on failure. |
| * |
| * See also: |
| * drm_atomic_helper_suspend(), drm_atomic_helper_resume() |
| */ |
| int drm_atomic_helper_disable_all(struct drm_device *dev, |
| struct drm_modeset_acquire_ctx *ctx) |
| { |
| struct drm_atomic_state *state; |
| struct drm_connector *conn; |
| int err; |
| |
| state = drm_atomic_state_alloc(dev); |
| if (!state) |
| return -ENOMEM; |
| |
| state->acquire_ctx = ctx; |
| |
| drm_for_each_connector(conn, dev) { |
| struct drm_crtc *crtc = conn->state->crtc; |
| struct drm_crtc_state *crtc_state; |
| |
| if (!crtc || conn->dpms != DRM_MODE_DPMS_ON) |
| continue; |
| |
| crtc_state = drm_atomic_get_crtc_state(state, crtc); |
| if (IS_ERR(crtc_state)) { |
| err = PTR_ERR(crtc_state); |
| goto free; |
| } |
| |
| crtc_state->active = false; |
| } |
| |
| err = drm_atomic_commit(state); |
| |
| free: |
| if (err < 0) |
| drm_atomic_state_free(state); |
| |
| return err; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_disable_all); |
| |
| /** |
| * drm_atomic_helper_suspend - subsystem-level suspend helper |
| * @dev: DRM device |
| * |
| * Duplicates the current atomic state, disables all active outputs and then |
| * returns a pointer to the original atomic state to the caller. Drivers can |
| * pass this pointer to the drm_atomic_helper_resume() helper upon resume to |
| * restore the output configuration that was active at the time the system |
| * entered suspend. |
| * |
| * Note that it is potentially unsafe to use this. The atomic state object |
| * returned by this function is assumed to be persistent. Drivers must ensure |
| * that this holds true. Before calling this function, drivers must make sure |
| * to suspend fbdev emulation so that nothing can be using the device. |
| * |
| * Returns: |
| * A pointer to a copy of the state before suspend on success or an ERR_PTR()- |
| * encoded error code on failure. Drivers should store the returned atomic |
| * state object and pass it to the drm_atomic_helper_resume() helper upon |
| * resume. |
| * |
| * See also: |
| * drm_atomic_helper_duplicate_state(), drm_atomic_helper_disable_all(), |
| * drm_atomic_helper_resume() |
| */ |
| struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev) |
| { |
| struct drm_modeset_acquire_ctx ctx; |
| struct drm_atomic_state *state; |
| int err; |
| |
| drm_modeset_acquire_init(&ctx, 0); |
| |
| retry: |
| err = drm_modeset_lock_all_ctx(dev, &ctx); |
| if (err < 0) { |
| state = ERR_PTR(err); |
| goto unlock; |
| } |
| |
| state = drm_atomic_helper_duplicate_state(dev, &ctx); |
| if (IS_ERR(state)) |
| goto unlock; |
| |
| err = drm_atomic_helper_disable_all(dev, &ctx); |
| if (err < 0) { |
| drm_atomic_state_free(state); |
| state = ERR_PTR(err); |
| goto unlock; |
| } |
| |
| unlock: |
| if (PTR_ERR(state) == -EDEADLK) { |
| drm_modeset_backoff(&ctx); |
| goto retry; |
| } |
| |
| drm_modeset_drop_locks(&ctx); |
| drm_modeset_acquire_fini(&ctx); |
| return state; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_suspend); |
| |
| /** |
| * drm_atomic_helper_resume - subsystem-level resume helper |
| * @dev: DRM device |
| * @state: atomic state to resume to |
| * |
| * Calls drm_mode_config_reset() to synchronize hardware and software states, |
| * grabs all modeset locks and commits the atomic state object. This can be |
| * used in conjunction with the drm_atomic_helper_suspend() helper to |
| * implement suspend/resume for drivers that support atomic mode-setting. |
| * |
| * Returns: |
| * 0 on success or a negative error code on failure. |
| * |
| * See also: |
| * drm_atomic_helper_suspend() |
| */ |
| int drm_atomic_helper_resume(struct drm_device *dev, |
| struct drm_atomic_state *state) |
| { |
| struct drm_mode_config *config = &dev->mode_config; |
| int err; |
| |
| drm_mode_config_reset(dev); |
| drm_modeset_lock_all(dev); |
| state->acquire_ctx = config->acquire_ctx; |
| err = drm_atomic_commit(state); |
| drm_modeset_unlock_all(dev); |
| |
| return err; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_resume); |
| |
| /** |
| * drm_atomic_helper_crtc_set_property - helper for crtc properties |
| * @crtc: DRM crtc |
| * @property: DRM property |
| * @val: value of property |
| * |
| * Provides a default crtc set_property handler using the atomic driver |
| * interface. |
| * |
| * RETURNS: |
| * Zero on success, error code on failure |
| */ |
| int |
| drm_atomic_helper_crtc_set_property(struct drm_crtc *crtc, |
| struct drm_property *property, |
| uint64_t val) |
| { |
| struct drm_atomic_state *state; |
| struct drm_crtc_state *crtc_state; |
| int ret = 0; |
| |
| state = drm_atomic_state_alloc(crtc->dev); |
| if (!state) |
| return -ENOMEM; |
| |
| /* ->set_property is always called with all locks held. */ |
| state->acquire_ctx = crtc->dev->mode_config.acquire_ctx; |
| retry: |
| crtc_state = drm_atomic_get_crtc_state(state, crtc); |
| if (IS_ERR(crtc_state)) { |
| ret = PTR_ERR(crtc_state); |
| goto fail; |
| } |
| |
| ret = drm_atomic_crtc_set_property(crtc, crtc_state, |
| property, val); |
| if (ret) |
| goto fail; |
| |
| ret = drm_atomic_commit(state); |
| if (ret != 0) |
| goto fail; |
| |
| /* Driver takes ownership of state on successful commit. */ |
| return 0; |
| fail: |
| if (ret == -EDEADLK) |
| goto backoff; |
| |
| drm_atomic_state_free(state); |
| |
| return ret; |
| backoff: |
| drm_atomic_state_clear(state); |
| drm_atomic_legacy_backoff(state); |
| |
| goto retry; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_crtc_set_property); |
| |
| /** |
| * drm_atomic_helper_plane_set_property - helper for plane properties |
| * @plane: DRM plane |
| * @property: DRM property |
| * @val: value of property |
| * |
| * Provides a default plane set_property handler using the atomic driver |
| * interface. |
| * |
| * RETURNS: |
| * Zero on success, error code on failure |
| */ |
| int |
| drm_atomic_helper_plane_set_property(struct drm_plane *plane, |
| struct drm_property *property, |
| uint64_t val) |
| { |
| struct drm_atomic_state *state; |
| struct drm_plane_state *plane_state; |
| int ret = 0; |
| |
| state = drm_atomic_state_alloc(plane->dev); |
| if (!state) |
| return -ENOMEM; |
| |
| /* ->set_property is always called with all locks held. */ |
| state->acquire_ctx = plane->dev->mode_config.acquire_ctx; |
| retry: |
| plane_state = drm_atomic_get_plane_state(state, plane); |
| if (IS_ERR(plane_state)) { |
| ret = PTR_ERR(plane_state); |
| goto fail; |
| } |
| |
| ret = drm_atomic_plane_set_property(plane, plane_state, |
| property, val); |
| if (ret) |
| goto fail; |
| |
| ret = drm_atomic_commit(state); |
| if (ret != 0) |
| goto fail; |
| |
| /* Driver takes ownership of state on successful commit. */ |
| return 0; |
| fail: |
| if (ret == -EDEADLK) |
| goto backoff; |
| |
| drm_atomic_state_free(state); |
| |
| return ret; |
| backoff: |
| drm_atomic_state_clear(state); |
| drm_atomic_legacy_backoff(state); |
| |
| goto retry; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_plane_set_property); |
| |
| /** |
| * drm_atomic_helper_connector_set_property - helper for connector properties |
| * @connector: DRM connector |
| * @property: DRM property |
| * @val: value of property |
| * |
| * Provides a default connector set_property handler using the atomic driver |
| * interface. |
| * |
| * RETURNS: |
| * Zero on success, error code on failure |
| */ |
| int |
| drm_atomic_helper_connector_set_property(struct drm_connector *connector, |
| struct drm_property *property, |
| uint64_t val) |
| { |
| struct drm_atomic_state *state; |
| struct drm_connector_state *connector_state; |
| int ret = 0; |
| |
| state = drm_atomic_state_alloc(connector->dev); |
| if (!state) |
| return -ENOMEM; |
| |
| /* ->set_property is always called with all locks held. */ |
| state->acquire_ctx = connector->dev->mode_config.acquire_ctx; |
| retry: |
| connector_state = drm_atomic_get_connector_state(state, connector); |
| if (IS_ERR(connector_state)) { |
| ret = PTR_ERR(connector_state); |
| goto fail; |
| } |
| |
| ret = drm_atomic_connector_set_property(connector, connector_state, |
| property, val); |
| if (ret) |
| goto fail; |
| |
| ret = drm_atomic_commit(state); |
| if (ret != 0) |
| goto fail; |
| |
| /* Driver takes ownership of state on successful commit. */ |
| return 0; |
| fail: |
| if (ret == -EDEADLK) |
| goto backoff; |
| |
| drm_atomic_state_free(state); |
| |
| return ret; |
| backoff: |
| drm_atomic_state_clear(state); |
| drm_atomic_legacy_backoff(state); |
| |
| goto retry; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_connector_set_property); |
| |
| /** |
| * drm_atomic_helper_page_flip - execute a legacy page flip |
| * @crtc: DRM crtc |
| * @fb: DRM framebuffer |
| * @event: optional DRM event to signal upon completion |
| * @flags: flip flags for non-vblank sync'ed updates |
| * |
| * Provides a default page flip implementation using the atomic driver interface. |
| * |
| * Note that for now so called async page flips (i.e. updates which are not |
| * synchronized to vblank) are not supported, since the atomic interfaces have |
| * no provisions for this yet. |
| * |
| * Returns: |
| * Returns 0 on success, negative errno numbers on failure. |
| */ |
| int drm_atomic_helper_page_flip(struct drm_crtc *crtc, |
| struct drm_framebuffer *fb, |
| struct drm_pending_vblank_event *event, |
| uint32_t flags) |
| { |
| struct drm_plane *plane = crtc->primary; |
| struct drm_atomic_state *state; |
| struct drm_plane_state *plane_state; |
| struct drm_crtc_state *crtc_state; |
| int ret = 0; |
| |
| if (flags & DRM_MODE_PAGE_FLIP_ASYNC) |
| return -EINVAL; |
| |
| state = drm_atomic_state_alloc(plane->dev); |
| if (!state) |
| return -ENOMEM; |
| |
| state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc); |
| retry: |
| crtc_state = drm_atomic_get_crtc_state(state, crtc); |
| if (IS_ERR(crtc_state)) { |
| ret = PTR_ERR(crtc_state); |
| goto fail; |
| } |
| crtc_state->event = event; |
| |
| plane_state = drm_atomic_get_plane_state(state, plane); |
| if (IS_ERR(plane_state)) { |
| ret = PTR_ERR(plane_state); |
| goto fail; |
| } |
| |
| ret = drm_atomic_set_crtc_for_plane(plane_state, crtc); |
| if (ret != 0) |
| goto fail; |
| drm_atomic_set_fb_for_plane(plane_state, fb); |
| |
| /* Make sure we don't accidentally do a full modeset. */ |
| state->allow_modeset = false; |
| if (!crtc_state->active) { |
| DRM_DEBUG_ATOMIC("[CRTC:%d] disabled, rejecting legacy flip\n", |
| crtc->base.id); |
| ret = -EINVAL; |
| goto fail; |
| } |
| |
| ret = drm_atomic_async_commit(state); |
| if (ret != 0) |
| goto fail; |
| |
| /* Driver takes ownership of state on successful async commit. */ |
| return 0; |
| fail: |
| if (ret == -EDEADLK) |
| goto backoff; |
| |
| drm_atomic_state_free(state); |
| |
| return ret; |
| backoff: |
| drm_atomic_state_clear(state); |
| drm_atomic_legacy_backoff(state); |
| |
| /* |
| * Someone might have exchanged the framebuffer while we dropped locks |
| * in the backoff code. We need to fix up the fb refcount tracking the |
| * core does for us. |
| */ |
| plane->old_fb = plane->fb; |
| |
| goto retry; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_page_flip); |
| |
| /** |
| * drm_atomic_helper_connector_dpms() - connector dpms helper implementation |
| * @connector: affected connector |
| * @mode: DPMS mode |
| * |
| * This is the main helper function provided by the atomic helper framework for |
| * implementing the legacy DPMS connector interface. It computes the new desired |
| * ->active state for the corresponding CRTC (if the connector is enabled) and |
| * updates it. |
| * |
| * Returns: |
| * Returns 0 on success, negative errno numbers on failure. |
| */ |
| int drm_atomic_helper_connector_dpms(struct drm_connector *connector, |
| int mode) |
| { |
| struct drm_mode_config *config = &connector->dev->mode_config; |
| struct drm_atomic_state *state; |
| struct drm_crtc_state *crtc_state; |
| struct drm_crtc *crtc; |
| struct drm_connector *tmp_connector; |
| int ret; |
| bool active = false; |
| int old_mode = connector->dpms; |
| |
| if (mode != DRM_MODE_DPMS_ON) |
| mode = DRM_MODE_DPMS_OFF; |
| |
| connector->dpms = mode; |
| crtc = connector->state->crtc; |
| |
| if (!crtc) |
| return 0; |
| |
| state = drm_atomic_state_alloc(connector->dev); |
| if (!state) |
| return -ENOMEM; |
| |
| state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc); |
| retry: |
| crtc_state = drm_atomic_get_crtc_state(state, crtc); |
| if (IS_ERR(crtc_state)) { |
| ret = PTR_ERR(crtc_state); |
| goto fail; |
| } |
| |
| WARN_ON(!drm_modeset_is_locked(&config->connection_mutex)); |
| |
| drm_for_each_connector(tmp_connector, connector->dev) { |
| if (tmp_connector->state->crtc != crtc) |
| continue; |
| |
| if (tmp_connector->dpms == DRM_MODE_DPMS_ON) { |
| active = true; |
| break; |
| } |
| } |
| crtc_state->active = active; |
| |
| ret = drm_atomic_commit(state); |
| if (ret != 0) |
| goto fail; |
| |
| /* Driver takes ownership of state on successful commit. */ |
| return 0; |
| fail: |
| if (ret == -EDEADLK) |
| goto backoff; |
| |
| connector->dpms = old_mode; |
| drm_atomic_state_free(state); |
| |
| return ret; |
| backoff: |
| drm_atomic_state_clear(state); |
| drm_atomic_legacy_backoff(state); |
| |
| goto retry; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_connector_dpms); |
| |
| /** |
| * DOC: atomic state reset and initialization |
| * |
| * Both the drm core and the atomic helpers assume that there is always the full |
| * and correct atomic software state for all connectors, CRTCs and planes |
| * available. Which is a bit a problem on driver load and also after system |
| * suspend. One way to solve this is to have a hardware state read-out |
| * infrastructure which reconstructs the full software state (e.g. the i915 |
| * driver). |
| * |
| * The simpler solution is to just reset the software state to everything off, |
| * which is easiest to do by calling drm_mode_config_reset(). To facilitate this |
| * the atomic helpers provide default reset implementations for all hooks. |
| * |
| * On the upside the precise state tracking of atomic simplifies system suspend |
| * and resume a lot. For drivers using drm_mode_config_reset() a complete recipe |
| * is implemented in drm_atomic_helper_suspend() and drm_atomic_helper_resume(). |
| * For other drivers the building blocks are split out, see the documentation |
| * for these functions. |
| */ |
| |
| /** |
| * drm_atomic_helper_crtc_reset - default ->reset hook for CRTCs |
| * @crtc: drm CRTC |
| * |
| * Resets the atomic state for @crtc by freeing the state pointer (which might |
| * be NULL, e.g. at driver load time) and allocating a new empty state object. |
| */ |
| void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc) |
| { |
| if (crtc->state) |
| drm_property_unreference_blob(crtc->state->mode_blob); |
| kfree(crtc->state); |
| crtc->state = kzalloc(sizeof(*crtc->state), GFP_KERNEL); |
| |
| if (crtc->state) |
| crtc->state->crtc = crtc; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_crtc_reset); |
| |
| /** |
| * __drm_atomic_helper_crtc_duplicate_state - copy atomic CRTC state |
| * @crtc: CRTC object |
| * @state: atomic CRTC state |
| * |
| * Copies atomic state from a CRTC's current state and resets inferred values. |
| * This is useful for drivers that subclass the CRTC state. |
| */ |
| void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc, |
| struct drm_crtc_state *state) |
| { |
| memcpy(state, crtc->state, sizeof(*state)); |
| |
| if (state->mode_blob) |
| drm_property_reference_blob(state->mode_blob); |
| state->mode_changed = false; |
| state->active_changed = false; |
| state->planes_changed = false; |
| state->connectors_changed = false; |
| state->event = NULL; |
| } |
| EXPORT_SYMBOL(__drm_atomic_helper_crtc_duplicate_state); |
| |
| /** |
| * drm_atomic_helper_crtc_duplicate_state - default state duplicate hook |
| * @crtc: drm CRTC |
| * |
| * Default CRTC state duplicate hook for drivers which don't have their own |
| * subclassed CRTC state structure. |
| */ |
| struct drm_crtc_state * |
| drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc) |
| { |
| struct drm_crtc_state *state; |
| |
| if (WARN_ON(!crtc->state)) |
| return NULL; |
| |
| state = kmalloc(sizeof(*state), GFP_KERNEL); |
| if (state) |
| __drm_atomic_helper_crtc_duplicate_state(crtc, state); |
| |
| return state; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state); |
| |
| /** |
| * __drm_atomic_helper_crtc_destroy_state - release CRTC state |
| * @crtc: CRTC object |
| * @state: CRTC state object to release |
| * |
| * Releases all resources stored in the CRTC state without actually freeing |
| * the memory of the CRTC state. This is useful for drivers that subclass the |
| * CRTC state. |
| */ |
| void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc, |
| struct drm_crtc_state *state) |
| { |
| drm_property_unreference_blob(state->mode_blob); |
| } |
| EXPORT_SYMBOL(__drm_atomic_helper_crtc_destroy_state); |
| |
| /** |
| * drm_atomic_helper_crtc_destroy_state - default state destroy hook |
| * @crtc: drm CRTC |
| * @state: CRTC state object to release |
| * |
| * Default CRTC state destroy hook for drivers which don't have their own |
| * subclassed CRTC state structure. |
| */ |
| void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc, |
| struct drm_crtc_state *state) |
| { |
| __drm_atomic_helper_crtc_destroy_state(crtc, state); |
| kfree(state); |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state); |
| |
| /** |
| * drm_atomic_helper_plane_reset - default ->reset hook for planes |
| * @plane: drm plane |
| * |
| * Resets the atomic state for @plane by freeing the state pointer (which might |
| * be NULL, e.g. at driver load time) and allocating a new empty state object. |
| */ |
| void drm_atomic_helper_plane_reset(struct drm_plane *plane) |
| { |
| if (plane->state && plane->state->fb) |
| drm_framebuffer_unreference(plane->state->fb); |
| |
| kfree(plane->state); |
| plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL); |
| |
| if (plane->state) { |
| plane->state->plane = plane; |
| plane->state->rotation = BIT(DRM_ROTATE_0); |
| } |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_plane_reset); |
| |
| /** |
| * __drm_atomic_helper_plane_duplicate_state - copy atomic plane state |
| * @plane: plane object |
| * @state: atomic plane state |
| * |
| * Copies atomic state from a plane's current state. This is useful for |
| * drivers that subclass the plane state. |
| */ |
| void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane, |
| struct drm_plane_state *state) |
| { |
| memcpy(state, plane->state, sizeof(*state)); |
| |
| if (state->fb) |
| drm_framebuffer_reference(state->fb); |
| } |
| EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state); |
| |
| /** |
| * drm_atomic_helper_plane_duplicate_state - default state duplicate hook |
| * @plane: drm plane |
| * |
| * Default plane state duplicate hook for drivers which don't have their own |
| * subclassed plane state structure. |
| */ |
| struct drm_plane_state * |
| drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane) |
| { |
| struct drm_plane_state *state; |
| |
| if (WARN_ON(!plane->state)) |
| return NULL; |
| |
| state = kmalloc(sizeof(*state), GFP_KERNEL); |
| if (state) |
| __drm_atomic_helper_plane_duplicate_state(plane, state); |
| |
| return state; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state); |
| |
| /** |
| * __drm_atomic_helper_plane_destroy_state - release plane state |
| * @plane: plane object |
| * @state: plane state object to release |
| * |
| * Releases all resources stored in the plane state without actually freeing |
| * the memory of the plane state. This is useful for drivers that subclass the |
| * plane state. |
| */ |
| void __drm_atomic_helper_plane_destroy_state(struct drm_plane *plane, |
| struct drm_plane_state *state) |
| { |
| if (state->fb) |
| drm_framebuffer_unreference(state->fb); |
| } |
| EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state); |
| |
| /** |
| * drm_atomic_helper_plane_destroy_state - default state destroy hook |
| * @plane: drm plane |
| * @state: plane state object to release |
| * |
| * Default plane state destroy hook for drivers which don't have their own |
| * subclassed plane state structure. |
| */ |
| void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane, |
| struct drm_plane_state *state) |
| { |
| __drm_atomic_helper_plane_destroy_state(plane, state); |
| kfree(state); |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state); |
| |
| /** |
| * __drm_atomic_helper_connector_reset - reset state on connector |
| * @connector: drm connector |
| * @conn_state: connector state to assign |
| * |
| * Initializes the newly allocated @conn_state and assigns it to |
| * #connector ->state, usually required when initializing the drivers |
| * or when called from the ->reset hook. |
| * |
| * This is useful for drivers that subclass the connector state. |
| */ |
| void |
| __drm_atomic_helper_connector_reset(struct drm_connector *connector, |
| struct drm_connector_state *conn_state) |
| { |
| if (conn_state) |
| conn_state->connector = connector; |
| |
| connector->state = conn_state; |
| } |
| EXPORT_SYMBOL(__drm_atomic_helper_connector_reset); |
| |
| /** |
| * drm_atomic_helper_connector_reset - default ->reset hook for connectors |
| * @connector: drm connector |
| * |
| * Resets the atomic state for @connector by freeing the state pointer (which |
| * might be NULL, e.g. at driver load time) and allocating a new empty state |
| * object. |
| */ |
| void drm_atomic_helper_connector_reset(struct drm_connector *connector) |
| { |
| struct drm_connector_state *conn_state = |
| kzalloc(sizeof(*conn_state), GFP_KERNEL); |
| |
| kfree(connector->state); |
| __drm_atomic_helper_connector_reset(connector, conn_state); |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_connector_reset); |
| |
| /** |
| * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state |
| * @connector: connector object |
| * @state: atomic connector state |
| * |
| * Copies atomic state from a connector's current state. This is useful for |
| * drivers that subclass the connector state. |
| */ |
| void |
| __drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector, |
| struct drm_connector_state *state) |
| { |
| memcpy(state, connector->state, sizeof(*state)); |
| } |
| EXPORT_SYMBOL(__drm_atomic_helper_connector_duplicate_state); |
| |
| /** |
| * drm_atomic_helper_connector_duplicate_state - default state duplicate hook |
| * @connector: drm connector |
| * |
| * Default connector state duplicate hook for drivers which don't have their own |
| * subclassed connector state structure. |
| */ |
| struct drm_connector_state * |
| drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector) |
| { |
| struct drm_connector_state *state; |
| |
| if (WARN_ON(!connector->state)) |
| return NULL; |
| |
| state = kmalloc(sizeof(*state), GFP_KERNEL); |
| if (state) |
| __drm_atomic_helper_connector_duplicate_state(connector, state); |
| |
| return state; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state); |
| |
| /** |
| * drm_atomic_helper_duplicate_state - duplicate an atomic state object |
| * @dev: DRM device |
| * @ctx: lock acquisition context |
| * |
| * Makes a copy of the current atomic state by looping over all objects and |
| * duplicating their respective states. This is used for example by suspend/ |
| * resume support code to save the state prior to suspend such that it can |
| * be restored upon resume. |
| * |
| * Note that this treats atomic state as persistent between save and restore. |
| * Drivers must make sure that this is possible and won't result in confusion |
| * or erroneous behaviour. |
| * |
| * Note that if callers haven't already acquired all modeset locks this might |
| * return -EDEADLK, which must be handled by calling drm_modeset_backoff(). |
| * |
| * Returns: |
| * A pointer to the copy of the atomic state object on success or an |
| * ERR_PTR()-encoded error code on failure. |
| * |
| * See also: |
| * drm_atomic_helper_suspend(), drm_atomic_helper_resume() |
| */ |
| struct drm_atomic_state * |
| drm_atomic_helper_duplicate_state(struct drm_device *dev, |
| struct drm_modeset_acquire_ctx *ctx) |
| { |
| struct drm_atomic_state *state; |
| struct drm_connector *conn; |
| struct drm_plane *plane; |
| struct drm_crtc *crtc; |
| int err = 0; |
| |
| state = drm_atomic_state_alloc(dev); |
| if (!state) |
| return ERR_PTR(-ENOMEM); |
| |
| state->acquire_ctx = ctx; |
| |
| drm_for_each_crtc(crtc, dev) { |
| struct drm_crtc_state *crtc_state; |
| |
| crtc_state = drm_atomic_get_crtc_state(state, crtc); |
| if (IS_ERR(crtc_state)) { |
| err = PTR_ERR(crtc_state); |
| goto free; |
| } |
| } |
| |
| drm_for_each_plane(plane, dev) { |
| struct drm_plane_state *plane_state; |
| |
| plane_state = drm_atomic_get_plane_state(state, plane); |
| if (IS_ERR(plane_state)) { |
| err = PTR_ERR(plane_state); |
| goto free; |
| } |
| } |
| |
| drm_for_each_connector(conn, dev) { |
| struct drm_connector_state *conn_state; |
| |
| conn_state = drm_atomic_get_connector_state(state, conn); |
| if (IS_ERR(conn_state)) { |
| err = PTR_ERR(conn_state); |
| goto free; |
| } |
| } |
| |
| /* clear the acquire context so that it isn't accidentally reused */ |
| state->acquire_ctx = NULL; |
| |
| free: |
| if (err < 0) { |
| drm_atomic_state_free(state); |
| state = ERR_PTR(err); |
| } |
| |
| return state; |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_duplicate_state); |
| |
| /** |
| * __drm_atomic_helper_connector_destroy_state - release connector state |
| * @connector: connector object |
| * @state: connector state object to release |
| * |
| * Releases all resources stored in the connector state without actually |
| * freeing the memory of the connector state. This is useful for drivers that |
| * subclass the connector state. |
| */ |
| void |
| __drm_atomic_helper_connector_destroy_state(struct drm_connector *connector, |
| struct drm_connector_state *state) |
| { |
| /* |
| * This is currently a placeholder so that drivers that subclass the |
| * state will automatically do the right thing if code is ever added |
| * to this function. |
| */ |
| } |
| EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state); |
| |
| /** |
| * drm_atomic_helper_connector_destroy_state - default state destroy hook |
| * @connector: drm connector |
| * @state: connector state object to release |
| * |
| * Default connector state destroy hook for drivers which don't have their own |
| * subclassed connector state structure. |
| */ |
| void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector, |
| struct drm_connector_state *state) |
| { |
| __drm_atomic_helper_connector_destroy_state(connector, state); |
| kfree(state); |
| } |
| EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state); |