/*
* Copyright (C) 2018 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 <[email protected]>
* Daniel Vetter <[email protected]>
*/
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_blend.h>
#include <drm/drm_bridge.h>
#include <drm/drm_connector.h>
#include <drm/drm_crtc.h>
#include <drm/drm_device.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_plane.h>
#include <drm/drm_print.h>
#include <drm/drm_vblank.h>
#include <drm/drm_writeback.h>
#include <linux/slab.h>
#include <linux/dma-fence.h>
/**
* 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_state_reset - reset the CRTC state
* @crtc_state: atomic CRTC state, must not be NULL
* @crtc: CRTC object, must not be NULL
*
* Initializes the newly allocated @crtc_state with default
* values. This is useful for drivers that subclass the CRTC state.
*/
void
__drm_atomic_helper_crtc_state_reset(struct drm_crtc_state *crtc_state,
struct drm_crtc *crtc)
{
crtc_state->crtc = crtc;
}
EXPORT_SYMBOL(__drm_atomic_helper_crtc_state_reset);
/**
* __drm_atomic_helper_crtc_reset - reset state on CRTC
* @crtc: drm CRTC
* @crtc_state: CRTC state to assign
*
* Initializes the newly allocated @crtc_state and assigns it to
* the &drm_crtc->state pointer of @crtc, usually required when
* initializing the drivers or when called from the &drm_crtc_funcs.reset
* hook.
*
* This is useful for drivers that subclass the CRTC state.
*/
void
__drm_atomic_helper_crtc_reset(struct drm_crtc *crtc,
struct drm_crtc_state *crtc_state)
{
if (crtc_state)
__drm_atomic_helper_crtc_state_reset(crtc_state, crtc);
if (drm_dev_has_vblank(crtc->dev))
drm_crtc_vblank_reset(crtc);
crtc->state = crtc_state;
}
EXPORT_SYMBOL(__drm_atomic_helper_crtc_reset);
/**
* drm_atomic_helper_crtc_reset - default &drm_crtc_funcs.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)
{
struct drm_crtc_state *crtc_state =
kzalloc(sizeof(*crtc->state), GFP_KERNEL);
if (crtc->state)
crtc->funcs->atomic_destroy_state(crtc, crtc->state);
__drm_atomic_helper_crtc_reset(crtc, crtc_state);
}
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_blob_get(state->mode_blob);
if (state->degamma_lut)
drm_property_blob_get(state->degamma_lut);
if (state->ctm)
drm_property_blob_get(state->ctm);
if (state->gamma_lut)
drm_property_blob_get(state->gamma_lut);
state->mode_changed = false;
state->active_changed = false;
state->planes_changed = false;
state->connectors_changed = false;
state->color_mgmt_changed = false;
state->zpos_changed = false;
state->commit = NULL;
state->event = NULL;
state->async_flip = false;
/* Self refresh should be canceled when a new update is available */
state->active = drm_atomic_crtc_effectively_active(state);
state->self_refresh_active = false;
}
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
* @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_state *state)
{
if (state->commit) {
/*
* In the event that a non-blocking commit returns
* -ERESTARTSYS before the commit_tail work is queued, we will
* have an extra reference to the commit object. Release it, if
* the event has not been consumed by the worker.
*
* state->event may be freed, so we can't directly look at
* state->event->base.completion.
*/
if (state->event && state->commit->abort_completion)
drm_crtc_commit_put(state->commit);
kfree(state->commit->event);
state->commit->event = NULL;
drm_crtc_commit_put(state->commit);
}
drm_property_blob_put(state->mode_blob);
drm_property_blob_put(state->degamma_lut);
drm_property_blob_put(state->ctm);
drm_property_blob_put(state->gamma_lut);
}
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(state);
kfree(state);
}
EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
/**
* __drm_atomic_helper_plane_state_reset - resets plane state to default values
* @plane_state: atomic plane state, must not be NULL
* @plane: plane object, must not be NULL
*
* Initializes the newly allocated @plane_state with default
* values. This is useful for drivers that subclass the CRTC state.
*/
void __drm_atomic_helper_plane_state_reset(struct drm_plane_state *plane_state,
struct drm_plane *plane)
{
u64 val;
plane_state->plane = plane;
plane_state->rotation = DRM_MODE_ROTATE_0;
plane_state->alpha = DRM_BLEND_ALPHA_OPAQUE;
plane_state->pixel_blend_mode = DRM_MODE_BLEND_PREMULTI;
if (plane->color_encoding_property) {
if (!drm_object_property_get_default_value(&plane->base,
plane->color_encoding_property,
&val))
plane_state->color_encoding = val;
}
if (plane->color_range_property) {
if (!drm_object_property_get_default_value(&plane->base,
plane->color_range_property,
&val))
plane_state->color_range = val;
}
if (plane->zpos_property) {
if (!drm_object_property_get_default_value(&plane->base,
plane->zpos_property,
&val)) {
plane_state->zpos = val;
plane_state->normalized_zpos = val;
}
}
if (plane->hotspot_x_property) {
if (!drm_object_property_get_default_value(&plane->base,
plane->hotspot_x_property,
&val))
plane_state->hotspot_x = val;
}
if (plane->hotspot_y_property) {
if (!drm_object_property_get_default_value(&plane->base,
plane->hotspot_y_property,
&val))
plane_state->hotspot_y = val;
}
}
EXPORT_SYMBOL(__drm_atomic_helper_plane_state_reset);
/**
* __drm_atomic_helper_plane_reset - reset state on plane
* @plane: drm plane
* @plane_state: plane state to assign
*
* Initializes the newly allocated @plane_state and assigns it to
* the &drm_crtc->state pointer of @plane, usually required when
* initializing the drivers or when called from the &drm_plane_funcs.reset
* hook.
*
* This is useful for drivers that subclass the plane state.
*/
void __drm_atomic_helper_plane_reset(struct drm_plane *plane,
struct drm_plane_state *plane_state)
{
if (plane_state)
__drm_atomic_helper_plane_state_reset(plane_state, plane);
plane->state = plane_state;
}
EXPORT_SYMBOL(__drm_atomic_helper_plane_reset);
/**
* drm_atomic_helper_plane_reset - default &drm_plane_funcs.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)
__drm_atomic_helper_plane_destroy_state(plane->state);
kfree(plane->state);
plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
if (plane->state)
__drm_atomic_helper_plane_reset(plane, plane->state);
}
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_get(state->fb);
state->fence = NULL;
state->commit = NULL;
state->fb_damage_clips = NULL;
state->color_mgmt_changed = false;
}
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
* @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_state *state)
{
if (state->fb)
drm_framebuffer_put(state->fb);
if (state->fence)
dma_fence_put(state->fence);
if (state->commit)
drm_crtc_commit_put(state->commit);
drm_property_blob_put(state->fb_damage_clips);
}
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(state);
kfree(state);
}
EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
/**
* __drm_atomic_helper_connector_state_reset - reset the connector state
* @conn_state: atomic connector state, must not be NULL
* @connector: connectotr object, must not be NULL
*
* Initializes the newly allocated @conn_state with default
* values. This is useful for drivers that subclass the connector state.
*/
void
__drm_atomic_helper_connector_state_reset(struct drm_connector_state *conn_state,
struct drm_connector *connector)
{
conn_state->connector = connector;
}
EXPORT_SYMBOL(__drm_atomic_helper_connector_state_reset);
/**
* __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
* the &drm_connector->state pointer of @connector, usually required when
* initializing the drivers or when called from the &drm_connector_funcs.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)
__drm_atomic_helper_connector_state_reset(conn_state, connector);
connector->state = conn_state;
}
EXPORT_SYMBOL(__drm_atomic_helper_connector_reset);
/**
* drm_atomic_helper_connector_reset - default &drm_connector_funcs.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);
if (connector->state)
__drm_atomic_helper_connector_destroy_state(connector->state);
kfree(connector->state);
__drm_atomic_helper_connector_reset(connector, conn_state);
}
EXPORT_SYMBOL(drm_atomic_helper_connector_reset);
/**
* drm_atomic_helper_connector_tv_margins_reset - Resets TV connector properties
* @connector: DRM connector
*
* Resets the TV-related properties attached to a connector.
*/
void drm_atomic_helper_connector_tv_margins_reset(struct drm_connector *connector)
{
struct drm_cmdline_mode *cmdline = &connector->cmdline_mode;
struct drm_connector_state *state = connector->state;
state->tv.margins.left = cmdline->tv_margins.left;
state->tv.margins.right = cmdline->tv_margins.right;
state->tv.margins.top = cmdline->tv_margins.top;
state->tv.margins.bottom = cmdline->tv_margins.bottom;
}
EXPORT_SYMBOL(drm_atomic_helper_connector_tv_margins_reset);
/**
* drm_atomic_helper_connector_tv_reset - Resets Analog TV connector properties
* @connector: DRM connector
*
* Resets the analog TV properties attached to a connector
*/
void drm_atomic_helper_connector_tv_reset(struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
struct drm_cmdline_mode *cmdline = &connector->cmdline_mode;
struct drm_connector_state *state = connector->state;
struct drm_property *prop;
uint64_t val;
prop = dev->mode_config.tv_mode_property;
if (prop)
if (!drm_object_property_get_default_value(&connector->base,
prop, &val))
state->tv.mode = val;
if (cmdline->tv_mode_specified)
state->tv.mode = cmdline->tv_mode;
prop = dev->mode_config.tv_select_subconnector_property;
if (prop)
if (!drm_object_property_get_default_value(&connector->base,
prop, &val))
state->tv.select_subconnector = val;
prop = dev->mode_config.tv_subconnector_property;
if (prop)
if (!drm_object_property_get_default_value(&connector->base,
prop, &val))
state->tv.subconnector = val;
prop = dev->mode_config.tv_brightness_property;
if (prop)
if (!drm_object_property_get_default_value(&connector->base,
prop, &val))
state->tv.brightness = val;
prop = dev->mode_config.tv_contrast_property;
if (prop)
if (!drm_object_property_get_default_value(&connector->base,
prop, &val))
state->tv.contrast = val;
prop = dev->mode_config.tv_flicker_reduction_property;
if (prop)
if (!drm_object_property_get_default_value(&connector->base,
prop, &val))
state->tv.flicker_reduction = val;
prop = dev->mode_config.tv_overscan_property;
if (prop)
if (!drm_object_property_get_default_value(&connector->base,
prop, &val))
state->tv.overscan = val;
prop = dev->mode_config.tv_saturation_property;
if (prop)
if (!drm_object_property_get_default_value(&connector->base,
prop, &val))
state->tv.saturation = val;
prop = dev->mode_config.tv_hue_property;
if (prop)
if (!drm_object_property_get_default_value(&connector->base,
prop, &val))
state->tv.hue = val;
drm_atomic_helper_connector_tv_margins_reset(connector);
}
EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset);
/**
* drm_atomic_helper_connector_tv_check - Validate an analog TV connector state
* @connector: DRM Connector
* @state: the DRM State object
*
* Checks the state object to see if the requested state is valid for an
* analog TV connector.
*
* Return:
* %0 for success, a negative error code on error.
*/
int drm_atomic_helper_connector_tv_check(struct drm_connector *connector,
struct drm_atomic_state *state)
{
struct drm_connector_state *old_conn_state =
drm_atomic_get_old_connector_state(state, connector);
struct drm_connector_state *new_conn_state =
drm_atomic_get_new_connector_state(state, connector);
struct drm_crtc_state *crtc_state;
struct drm_crtc *crtc;
crtc = new_conn_state->crtc;
if (!crtc)
return 0;
crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
if (!crtc_state)
return -EINVAL;
if (old_conn_state->tv.mode != new_conn_state->tv.mode)
crtc_state->mode_changed = true;
if (old_conn_state->tv.margins.left != new_conn_state->tv.margins.left ||
old_conn_state->tv.margins.right != new_conn_state->tv.margins.right ||
old_conn_state->tv.margins.top != new_conn_state->tv.margins.top ||
old_conn_state->tv.margins.bottom != new_conn_state->tv.margins.bottom ||
old_conn_state->tv.mode != new_conn_state->tv.mode ||
old_conn_state->tv.brightness != new_conn_state->tv.brightness ||
old_conn_state->tv.contrast != new_conn_state->tv.contrast ||
old_conn_state->tv.flicker_reduction != new_conn_state->tv.flicker_reduction ||
old_conn_state->tv.overscan != new_conn_state->tv.overscan ||
old_conn_state->tv.saturation != new_conn_state->tv.saturation ||
old_conn_state->tv.hue != new_conn_state->tv.hue)
crtc_state->connectors_changed = true;
return 0;
}
EXPORT_SYMBOL(drm_atomic_helper_connector_tv_check);
/**
* __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));
if (state->crtc)
drm_connector_get(connector);
state->commit = NULL;
if (state->hdr_output_metadata)
drm_property_blob_get(state->hdr_output_metadata);
/* Don't copy over a writeback job, they are used only once */
state->writeback_job = NULL;
}
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_connector_destroy_state - release connector state
* @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_state *state)
{
if (state->crtc)
drm_connector_put(state->connector);
if (state->commit)
drm_crtc_commit_put(state->commit);
if (state->writeback_job)
drm_writeback_cleanup_job(state->writeback_job);
drm_property_blob_put(state->hdr_output_metadata);
}
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(state);
kfree(state);
}
EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);
/**
* __drm_atomic_helper_private_obj_duplicate_state - copy atomic private state
* @obj: CRTC object
* @state: new private object state
*
* Copies atomic state from a private objects's current state and resets inferred values.
* This is useful for drivers that subclass the private state.
*/
void __drm_atomic_helper_private_obj_duplicate_state(struct drm_private_obj *obj,
struct drm_private_state *state)
{
memcpy(state, obj->state, sizeof(*state));
}
EXPORT_SYMBOL(__drm_atomic_helper_private_obj_duplicate_state);
/**
* __drm_atomic_helper_bridge_duplicate_state() - Copy atomic bridge state
* @bridge: bridge object
* @state: atomic bridge state
*
* Copies atomic state from a bridge's current state and resets inferred values.
* This is useful for drivers that subclass the bridge state.
*/
void __drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge,
struct drm_bridge_state *state)
{
__drm_atomic_helper_private_obj_duplicate_state(&bridge->base,
&state->base);
state->bridge = bridge;
}
EXPORT_SYMBOL(__drm_atomic_helper_bridge_duplicate_state);
/**
* drm_atomic_helper_bridge_duplicate_state() - Duplicate a bridge state object
* @bridge: bridge object
*
* Allocates a new bridge state and initializes it with the current bridge
* state values. This helper is meant to be used as a bridge
* &drm_bridge_funcs.atomic_duplicate_state hook for bridges that don't
* subclass the bridge state.
*/
struct drm_bridge_state *
drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge)
{
struct drm_bridge_state *new;
if (WARN_ON(!bridge->base.state))
return NULL;
new = kzalloc(sizeof(*new), GFP_KERNEL);
if (new)
__drm_atomic_helper_bridge_duplicate_state(bridge, new);
return new;
}
EXPORT_SYMBOL(drm_atomic_helper_bridge_duplicate_state);
/**
* drm_atomic_helper_bridge_destroy_state() - Destroy a bridge state object
* @bridge: the bridge this state refers to
* @state: bridge state to destroy
*
* Destroys a bridge state previously created by
* &drm_atomic_helper_bridge_reset() or
* &drm_atomic_helper_bridge_duplicate_state(). This helper is meant to be
* used as a bridge &drm_bridge_funcs.atomic_destroy_state hook for bridges
* that don't subclass the bridge state.
*/
void drm_atomic_helper_bridge_destroy_state(struct drm_bridge *bridge,
struct drm_bridge_state *state)
{
kfree(state);
}
EXPORT_SYMBOL(drm_atomic_helper_bridge_destroy_state);
/**
* __drm_atomic_helper_bridge_reset() - Initialize a bridge state to its
* default
* @bridge: the bridge this state refers to
* @state: bridge state to initialize
*
* Initializes the bridge state to default values. This is meant to be called
* by the bridge &drm_bridge_funcs.atomic_reset hook for bridges that subclass
* the bridge state.
*/
void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge,
struct drm_bridge_state *state)
{
memset(state, 0, sizeof(*state));
state->bridge = bridge;
}
EXPORT_SYMBOL(__drm_atomic_helper_bridge_reset);
/**
* drm_atomic_helper_bridge_reset() - Allocate and initialize a bridge state
* to its default
* @bridge: the bridge this state refers to
*
* Allocates the bridge state and initializes it to default values. This helper
* is meant to be used as a bridge &drm_bridge_funcs.atomic_reset hook for
* bridges that don't subclass the bridge state.
*/
struct drm_bridge_state *
drm_atomic_helper_bridge_reset(struct drm_bridge *bridge)
{
struct drm_bridge_state *bridge_state;
bridge_state = kzalloc(sizeof(*bridge_state), GFP_KERNEL);
if (!bridge_state)
return ERR_PTR(-ENOMEM);
__drm_atomic_helper_bridge_reset(bridge, bridge_state);
return bridge_state;
}
EXPORT_SYMBOL(drm_atomic_helper_bridge_reset);
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