- 根目录:
- drivers
- gpu
- drm
- drm_atomic_helper.c
/*
* 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.
*/
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 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], stealing it\n",
encoder->base.id, encoder->name,
encoder_crtc->base.id);
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]\n",
connector->base.id,
connector->name,
new_encoder->base.id,
new_encoder->name,
connector_state->crtc->base.id);
return 0;
}
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]\n",
connector->base.id,
connector->name,
new_encoder->base.id,
new_encoder->name,
connector_state->crtc->base.id);
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] fixup failed\n",
crtc->base.id);
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] mode changed\n",
crtc->base.id);
crtc_state->mode_changed = true;
}
if (crtc->state->enable != crtc_state->enable) {
DRM_DEBUG_ATOMIC("[CRTC:%d] enable changed\n",
crtc->base.id);
/*
* 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) {
int num_connectors;
/*
* 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] active changed\n",
crtc->base.id);
crtc_state->active_changed = true;
}
if (!drm_atomic_crtc_needs_modeset(crtc_state))
continue;
DRM_DEBUG_ATOMIC("[CRTC:%d] needs all connectors, enable: %c, active: %c\n",
crtc->base.id,
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;
num_connectors = drm_atomic_connectors_for_crtc(state,
crtc);
if (crtc_state->enable != !!num_connectors) {
DRM_DEBUG_ATOMIC("[CRTC:%d] enabled/connectors mismatch\n",
crtc->base.id);
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] atomic driver check failed\n",
plane->base.id);
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] atomic driver check failed\n",
crtc->base.id);
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;
struct drm_crtc_state *old_crtc_state;
/* 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]\n",
crtc->base.id);
/* 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]\n",
crtc->base.id);
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]\n",
crtc->base.id);
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;
}
}
static bool 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;
}
/**
* 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 (!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_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_h = crtc_h;
plane_state->crtc_w = crtc_w;
plane_state->src_x = src_x;
plane_state->src_y = src_y;
plane_state->src_h = src_h;
plane_state->src_w = src_w;
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_h = 0;
plane_state->crtc_w = 0;
plane_state->src_x = 0;
plane_state->src_y = 0;
plane_state->src_h = 0;
plane_state->src_w = 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 (!drm_atomic_connectors_for_crtc(state, crtc)) {
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_h = vdisplay;
primary_state->crtc_w = hdisplay;
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_h = hdisplay << 16;
primary_state->src_w = vdisplay << 16;
} else {
primary_state->src_h = vdisplay << 16;
primary_state->src_w = hdisplay << 16;
}
commit:
ret = update_output_state(state, set);
if (ret)
return ret;
return 0;
}
/**
* 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);
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.
*/
/**
* 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 && crtc->state->mode_blob)
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)
{
if (state->mode_blob)
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;
}
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 - 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)
{
kfree(connector->state);
connector->state = kzalloc(sizeof(*connector->state), GFP_KERNEL);
if (connector->state)
connector->state->connector = connector;
}
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.
*
* 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.
*/
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);