Linux 4.13.16

[linux/fpc-iii.git] / include / drm / drm_mode_config.h

/*
 * Copyright (c) 2016 Intel Corporation
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#ifndef __DRM_MODE_CONFIG_H__
#define __DRM_MODE_CONFIG_H__

#include <linux/mutex.h>
#include <linux/types.h>
#include <linux/idr.h>
#include <linux/workqueue.h>

#include <drm/drm_modeset_lock.h>

struct drm_file;
struct drm_device;
struct drm_atomic_state;
struct drm_mode_fb_cmd2;
struct drm_format_info;

/**
 * struct drm_mode_config_funcs - basic driver provided mode setting functions
 *
 * Some global (i.e. not per-CRTC, connector, etc) mode setting functions that
 * involve drivers.
 */
struct drm_mode_config_funcs {
        /**
         * @fb_create:
         *
         * Create a new framebuffer object. The core does basic checks on the
         * requested metadata, but most of that is left to the driver. See
         * &struct drm_mode_fb_cmd2 for details.
         *
         * If the parameters are deemed valid and the backing storage objects in
         * the underlying memory manager all exist, then the driver allocates
         * a new &drm_framebuffer structure, subclassed to contain
         * driver-specific information (like the internal native buffer object
         * references). It also needs to fill out all relevant metadata, which
         * should be done by calling drm_helper_mode_fill_fb_struct().
         *
         * The initialization is finalized by calling drm_framebuffer_init(),
         * which registers the framebuffer and makes it accessible to other
         * threads.
         *
         * RETURNS:
         *
         * A new framebuffer with an initial reference count of 1 or a negative
         * error code encoded with ERR_PTR().
         */
        struct drm_framebuffer *(*fb_create)(struct drm_device *dev,
                                             struct drm_file *file_priv,
                                             const struct drm_mode_fb_cmd2 *mode_cmd);

        /**
         * @get_format_info:
         *
         * Allows a driver to return custom format information for special
         * fb layouts (eg. ones with auxiliary compression control planes).
         *
         * RETURNS:
         *
         * The format information specific to the given fb metadata, or
         * NULL if none is found.
         */
        const struct drm_format_info *(*get_format_info)(const struct drm_mode_fb_cmd2 *mode_cmd);

        /**
         * @output_poll_changed:
         *
         * Callback used by helpers to inform the driver of output configuration
         * changes.
         *
         * Drivers implementing fbdev emulation with the helpers can call
         * drm_fb_helper_hotplug_changed from this hook to inform the fbdev
         * helper of output changes.
         *
         * FIXME:
         *
         * Except that there's no vtable for device-level helper callbacks
         * there's no reason this is a core function.
         */
        void (*output_poll_changed)(struct drm_device *dev);

        /**
         * @atomic_check:
         *
         * This is the only hook to validate an atomic modeset update. This
         * function must reject any modeset and state changes which the hardware
         * or driver doesn't support. This includes but is of course not limited
         * to:
         *
         *  - Checking that the modes, framebuffers, scaling and placement
         *    requirements and so on are within the limits of the hardware.
         *
         *  - Checking that any hidden shared resources are not oversubscribed.
         *    This can be shared PLLs, shared lanes, overall memory bandwidth,
         *    display fifo space (where shared between planes or maybe even
         *    CRTCs).
         *
         *  - Checking that virtualized resources exported to userspace are not
         *    oversubscribed. For various reasons it can make sense to expose
         *    more planes, crtcs or encoders than which are physically there. One
         *    example is dual-pipe operations (which generally should be hidden
         *    from userspace if when lockstepped in hardware, exposed otherwise),
         *    where a plane might need 1 hardware plane (if it's just on one
         *    pipe), 2 hardware planes (when it spans both pipes) or maybe even
         *    shared a hardware plane with a 2nd plane (if there's a compatible
         *    plane requested on the area handled by the other pipe).
         *
         *  - Check that any transitional state is possible and that if
         *    requested, the update can indeed be done in the vblank period
         *    without temporarily disabling some functions.
         *
         *  - Check any other constraints the driver or hardware might have.
         *
         *  - This callback also needs to correctly fill out the &drm_crtc_state
         *    in this update to make sure that drm_atomic_crtc_needs_modeset()
         *    reflects the nature of the possible update and returns true if and
         *    only if the update cannot be applied without tearing within one
         *    vblank on that CRTC. The core uses that information to reject
         *    updates which require a full modeset (i.e. blanking the screen, or
         *    at least pausing updates for a substantial amount of time) if
         *    userspace has disallowed that in its request.
         *
         *  - The driver also does not need to repeat basic input validation
         *    like done for the corresponding legacy entry points. The core does
         *    that before calling this hook.
         *
         * See the documentation of @atomic_commit for an exhaustive list of
         * error conditions which don't have to be checked at the in this
         * callback.
         *
         * See the documentation for &struct drm_atomic_state for how exactly
         * an atomic modeset update is described.
         *
         * Drivers using the atomic helpers can implement this hook using
         * drm_atomic_helper_check(), or one of the exported sub-functions of
         * it.
         *
         * RETURNS:
         *
         * 0 on success or one of the below negative error codes:
         *
         *  - -EINVAL, if any of the above constraints are violated.
         *
         *  - -EDEADLK, when returned from an attempt to acquire an additional
         *    &drm_modeset_lock through drm_modeset_lock().
         *
         *  - -ENOMEM, if allocating additional state sub-structures failed due
         *    to lack of memory.
         *
         *  - -EINTR, -EAGAIN or -ERESTARTSYS, if the IOCTL should be restarted.
         *    This can either be due to a pending signal, or because the driver
         *    needs to completely bail out to recover from an exceptional
         *    situation like a GPU hang. From a userspace point all errors are
         *    treated equally.
         */
        int (*atomic_check)(struct drm_device *dev,
                            struct drm_atomic_state *state);

        /**
         * @atomic_commit:
         *
         * This is the only hook to commit an atomic modeset update. The core
         * guarantees that @atomic_check has been called successfully before
         * calling this function, and that nothing has been changed in the
         * interim.
         *
         * See the documentation for &struct drm_atomic_state for how exactly
         * an atomic modeset update is described.
         *
         * Drivers using the atomic helpers can implement this hook using
         * drm_atomic_helper_commit(), or one of the exported sub-functions of
         * it.
         *
         * Nonblocking commits (as indicated with the nonblock parameter) must
         * do any preparatory work which might result in an unsuccessful commit
         * in the context of this callback. The only exceptions are hardware
         * errors resulting in -EIO. But even in that case the driver must
         * ensure that the display pipe is at least running, to avoid
         * compositors crashing when pageflips don't work. Anything else,
         * specifically committing the update to the hardware, should be done
         * without blocking the caller. For updates which do not require a
         * modeset this must be guaranteed.
         *
         * The driver must wait for any pending rendering to the new
         * framebuffers to complete before executing the flip. It should also
         * wait for any pending rendering from other drivers if the underlying
         * buffer is a shared dma-buf. Nonblocking commits must not wait for
         * rendering in the context of this callback.
         *
         * An application can request to be notified when the atomic commit has
         * completed. These events are per-CRTC and can be distinguished by the
         * CRTC index supplied in &drm_event to userspace.
         *
         * The drm core will supply a &struct drm_event in each CRTC's
         * &drm_crtc_state.event. See the documentation for
         * &drm_crtc_state.event for more details about the precise semantics of
         * this event.
         *
         * NOTE:
         *
         * Drivers are not allowed to shut down any display pipe successfully
         * enabled through an atomic commit on their own. Doing so can result in
         * compositors crashing if a page flip is suddenly rejected because the
         * pipe is off.
         *
         * RETURNS:
         *
         * 0 on success or one of the below negative error codes:
         *
         *  - -EBUSY, if a nonblocking updated is requested and there is
         *    an earlier updated pending. Drivers are allowed to support a queue
         *    of outstanding updates, but currently no driver supports that.
         *    Note that drivers must wait for preceding updates to complete if a
         *    synchronous update is requested, they are not allowed to fail the
         *    commit in that case.
         *
         *  - -ENOMEM, if the driver failed to allocate memory. Specifically
         *    this can happen when trying to pin framebuffers, which must only
         *    be done when committing the state.
         *
         *  - -ENOSPC, as a refinement of the more generic -ENOMEM to indicate
         *    that the driver has run out of vram, iommu space or similar GPU
         *    address space needed for framebuffer.
         *
         *  - -EIO, if the hardware completely died.
         *
         *  - -EINTR, -EAGAIN or -ERESTARTSYS, if the IOCTL should be restarted.
         *    This can either be due to a pending signal, or because the driver
         *    needs to completely bail out to recover from an exceptional
         *    situation like a GPU hang. From a userspace point of view all errors are
         *    treated equally.
         *
         * This list is exhaustive. Specifically this hook is not allowed to
         * return -EINVAL (any invalid requests should be caught in
         * @atomic_check) or -EDEADLK (this function must not acquire
         * additional modeset locks).
         */
        int (*atomic_commit)(struct drm_device *dev,
                             struct drm_atomic_state *state,
                             bool nonblock);

        /**
         * @atomic_state_alloc:
         *
         * This optional hook can be used by drivers that want to subclass struct
         * &drm_atomic_state to be able to track their own driver-private global
         * state easily. If this hook is implemented, drivers must also
         * implement @atomic_state_clear and @atomic_state_free.
         *
         * RETURNS:
         *
         * A new &drm_atomic_state on success or NULL on failure.
         */
        struct drm_atomic_state *(*atomic_state_alloc)(struct drm_device *dev);

        /**
         * @atomic_state_clear:
         *
         * This hook must clear any driver private state duplicated into the
         * passed-in &drm_atomic_state. This hook is called when the caller
         * encountered a &drm_modeset_lock deadlock and needs to drop all
         * already acquired locks as part of the deadlock avoidance dance
         * implemented in drm_modeset_backoff().
         *
         * Any duplicated state must be invalidated since a concurrent atomic
         * update might change it, and the drm atomic interfaces always apply
         * updates as relative changes to the current state.
         *
         * Drivers that implement this must call drm_atomic_state_default_clear()
         * to clear common state.
         */
        void (*atomic_state_clear)(struct drm_atomic_state *state);

        /**
         * @atomic_state_free:
         *
         * This hook needs driver private resources and the &drm_atomic_state
         * itself. Note that the core first calls drm_atomic_state_clear() to
         * avoid code duplicate between the clear and free hooks.
         *
         * Drivers that implement this must call
         * drm_atomic_state_default_release() to release common resources.
         */
        void (*atomic_state_free)(struct drm_atomic_state *state);
};

/**
 * struct drm_mode_config - Mode configuration control structure
 * @min_width: minimum pixel width on this device
 * @min_height: minimum pixel height on this device
 * @max_width: maximum pixel width on this device
 * @max_height: maximum pixel height on this device
 * @funcs: core driver provided mode setting functions
 * @fb_base: base address of the framebuffer
 * @poll_enabled: track polling support for this device
 * @poll_running: track polling status for this device
 * @delayed_event: track delayed poll uevent deliver for this device
 * @output_poll_work: delayed work for polling in process context
 * @preferred_depth: preferred RBG pixel depth, used by fb helpers
 * @prefer_shadow: hint to userspace to prefer shadow-fb rendering
 * @cursor_width: hint to userspace for max cursor width
 * @cursor_height: hint to userspace for max cursor height
 * @helper_private: mid-layer private data
 *
 * Core mode resource tracking structure.  All CRTC, encoders, and connectors
 * enumerated by the driver are added here, as are global properties.  Some
 * global restrictions are also here, e.g. dimension restrictions.
 */
struct drm_mode_config {
        /**
         * @mutex:
         *
         * This is the big scary modeset BKL which protects everything that
         * isn't protect otherwise. Scope is unclear and fuzzy, try to remove
         * anything from under it's protection and move it into more well-scoped
         * locks.
         *
         * The one important thing this protects is the use of @acquire_ctx.
         */
        struct mutex mutex;

        /**
         * @connection_mutex:
         *
         * This protects connector state and the connector to encoder to CRTC
         * routing chain.
         *
         * For atomic drivers specifically this protects &drm_connector.state.
         */
        struct drm_modeset_lock connection_mutex;

        /**
         * @acquire_ctx:
         *
         * Global implicit acquire context used by atomic drivers for legacy
         * IOCTLs. Deprecated, since implicit locking contexts make it
         * impossible to use driver-private &struct drm_modeset_lock. Users of
         * this must hold @mutex.
         */
        struct drm_modeset_acquire_ctx *acquire_ctx;

        /**
         * @idr_mutex:
         *
         * Mutex for KMS ID allocation and management. Protects both @crtc_idr
         * and @tile_idr.
         */
        struct mutex idr_mutex;

        /**
         * @crtc_idr:
         *
         * Main KMS ID tracking object. Use this idr for all IDs, fb, crtc,
         * connector, modes - just makes life easier to have only one.
         */
        struct idr crtc_idr;

        /**
         * @tile_idr:
         *
         * Use this idr for allocating new IDs for tiled sinks like use in some
         * high-res DP MST screens.
         */
        struct idr tile_idr;

        /** @fb_lock: Mutex to protect fb the global @fb_list and @num_fb. */
        struct mutex fb_lock;
        /** @num_fb: Number of entries on @fb_list. */
        int num_fb;
        /** @fb_list: List of all &struct drm_framebuffer. */
        struct list_head fb_list;

        /**
         * @connector_list_lock: Protects @num_connector and
         * @connector_list.
         */
        spinlock_t connector_list_lock;
        /**
         * @num_connector: Number of connectors on this device. Protected by
         * @connector_list_lock.
         */
        int num_connector;
        /**
         * @connector_ida: ID allocator for connector indices.
         */
        struct ida connector_ida;
        /**
         * @connector_list:
         *
         * List of connector objects linked with &drm_connector.head. Protected
         * by @connector_list_lock. Only use drm_for_each_connector_iter() and
         * &struct drm_connector_list_iter to walk this list.
         */
        struct list_head connector_list;
        /**
         * @num_encoder:
         *
         * Number of encoders on this device. This is invariant over the
         * lifetime of a device and hence doesn't need any locks.
         */
        int num_encoder;
        /**
         * @encoder_list:
         *
         * List of encoder objects linked with &drm_encoder.head. This is
         * invariant over the lifetime of a device and hence doesn't need any
         * locks.
         */
        struct list_head encoder_list;

        /**
         * @num_overlay_plane:
         *
         * Number of overlay planes on this device, excluding primary and cursor
         * planes.
         *
         * Track number of overlay planes separately from number of total
         * planes.  By default we only advertise overlay planes to userspace; if
         * userspace sets the "universal plane" capability bit, we'll go ahead
         * and expose all planes. This is invariant over the lifetime of a
         * device and hence doesn't need any locks.
         */
        int num_overlay_plane;
        /**
         * @num_total_plane:
         *
         * Number of universal (i.e. with primary/curso) planes on this device.
         * This is invariant over the lifetime of a device and hence doesn't
         * need any locks.
         */
        int num_total_plane;
        /**
         * @plane_list:
         *
         * List of plane objects linked with &drm_plane.head. This is invariant
         * over the lifetime of a device and hence doesn't need any locks.
         */
        struct list_head plane_list;

        /**
         * @num_crtc:
         *
         * Number of CRTCs on this device linked with &drm_crtc.head. This is invariant over the lifetime
         * of a device and hence doesn't need any locks.
         */
        int num_crtc;
        /**
         * @crtc_list:
         *
         * List of CRTC objects linked with &drm_crtc.head. This is invariant
         * over the lifetime of a device and hence doesn't need any locks.
         */
        struct list_head crtc_list;

        /**
         * @property_list:
         *
         * List of property type objects linked with &drm_property.head. This is
         * invariant over the lifetime of a device and hence doesn't need any
         * locks.
         */
        struct list_head property_list;

        int min_width, min_height;
        int max_width, max_height;
        const struct drm_mode_config_funcs *funcs;
        resource_size_t fb_base;

        /* output poll support */
        bool poll_enabled;
        bool poll_running;
        bool delayed_event;
        struct delayed_work output_poll_work;

        /**
         * @blob_lock:
         *
         * Mutex for blob property allocation and management, protects
         * @property_blob_list and &drm_file.blobs.
         */
        struct mutex blob_lock;

        /**
         * @property_blob_list:
         *
         * List of all the blob property objects linked with
         * &drm_property_blob.head. Protected by @blob_lock.
         */
        struct list_head property_blob_list;

        /* pointers to standard properties */

        /**
         * @edid_property: Default connector property to hold the EDID of the
         * currently connected sink, if any.
         */
        struct drm_property *edid_property;
        /**
         * @dpms_property: Default connector property to control the
         * connector's DPMS state.
         */
        struct drm_property *dpms_property;
        /**
         * @path_property: Default connector property to hold the DP MST path
         * for the port.
         */
        struct drm_property *path_property;
        /**
         * @tile_property: Default connector property to store the tile
         * position of a tiled screen, for sinks which need to be driven with
         * multiple CRTCs.
         */
        struct drm_property *tile_property;
        /**
         * @link_status_property: Default connector property for link status
         * of a connector
         */
        struct drm_property *link_status_property;
        /**
         * @plane_type_property: Default plane property to differentiate
         * CURSOR, PRIMARY and OVERLAY legacy uses of planes.
         */
        struct drm_property *plane_type_property;
        /**
         * @prop_src_x: Default atomic plane property for the plane source
         * position in the connected &drm_framebuffer.
         */
        struct drm_property *prop_src_x;
        /**
         * @prop_src_y: Default atomic plane property for the plane source
         * position in the connected &drm_framebuffer.
         */
        struct drm_property *prop_src_y;
        /**
         * @prop_src_w: Default atomic plane property for the plane source
         * position in the connected &drm_framebuffer.
         */
        struct drm_property *prop_src_w;
        /**
         * @prop_src_h: Default atomic plane property for the plane source
         * position in the connected &drm_framebuffer.
         */
        struct drm_property *prop_src_h;
        /**
         * @prop_crtc_x: Default atomic plane property for the plane destination
         * position in the &drm_crtc is is being shown on.
         */
        struct drm_property *prop_crtc_x;
        /**
         * @prop_crtc_y: Default atomic plane property for the plane destination
         * position in the &drm_crtc is is being shown on.
         */
        struct drm_property *prop_crtc_y;
        /**
         * @prop_crtc_w: Default atomic plane property for the plane destination
         * position in the &drm_crtc is is being shown on.
         */
        struct drm_property *prop_crtc_w;
        /**
         * @prop_crtc_h: Default atomic plane property for the plane destination
         * position in the &drm_crtc is is being shown on.
         */
        struct drm_property *prop_crtc_h;
        /**
         * @prop_fb_id: Default atomic plane property to specify the
         * &drm_framebuffer.
         */
        struct drm_property *prop_fb_id;
        /**
         * @prop_in_fence_fd: Sync File fd representing the incoming fences
         * for a Plane.
         */
        struct drm_property *prop_in_fence_fd;
        /**
         * @prop_out_fence_ptr: Sync File fd pointer representing the
         * outgoing fences for a CRTC. Userspace should provide a pointer to a
         * value of type s32, and then cast that pointer to u64.
         */
        struct drm_property *prop_out_fence_ptr;
        /**
         * @prop_crtc_id: Default atomic plane property to specify the
         * &drm_crtc.
         */
        struct drm_property *prop_crtc_id;
        /**
         * @prop_active: Default atomic CRTC property to control the active
         * state, which is the simplified implementation for DPMS in atomic
         * drivers.
         */
        struct drm_property *prop_active;
        /**
         * @prop_mode_id: Default atomic CRTC property to set the mode for a
         * CRTC. A 0 mode implies that the CRTC is entirely disabled - all
         * connectors must be of and active must be set to disabled, too.
         */
        struct drm_property *prop_mode_id;

        /**
         * @dvi_i_subconnector_property: Optional DVI-I property to
         * differentiate between analog or digital mode.
         */
        struct drm_property *dvi_i_subconnector_property;
        /**
         * @dvi_i_select_subconnector_property: Optional DVI-I property to
         * select between analog or digital mode.
         */
        struct drm_property *dvi_i_select_subconnector_property;

        /**
         * @tv_subconnector_property: Optional TV property to differentiate
         * between different TV connector types.
         */
        struct drm_property *tv_subconnector_property;
        /**
         * @tv_select_subconnector_property: Optional TV property to select
         * between different TV connector types.
         */
        struct drm_property *tv_select_subconnector_property;
        /**
         * @tv_mode_property: Optional TV property to select
         * the output TV mode.
         */
        struct drm_property *tv_mode_property;
        /**
         * @tv_left_margin_property: Optional TV property to set the left
         * margin.
         */
        struct drm_property *tv_left_margin_property;
        /**
         * @tv_right_margin_property: Optional TV property to set the right
         * margin.
         */
        struct drm_property *tv_right_margin_property;
        /**
         * @tv_top_margin_property: Optional TV property to set the right
         * margin.
         */
        struct drm_property *tv_top_margin_property;
        /**
         * @tv_bottom_margin_property: Optional TV property to set the right
         * margin.
         */
        struct drm_property *tv_bottom_margin_property;
        /**
         * @tv_brightness_property: Optional TV property to set the
         * brightness.
         */
        struct drm_property *tv_brightness_property;
        /**
         * @tv_contrast_property: Optional TV property to set the
         * contrast.
         */
        struct drm_property *tv_contrast_property;
        /**
         * @tv_flicker_reduction_property: Optional TV property to control the
         * flicker reduction mode.
         */
        struct drm_property *tv_flicker_reduction_property;
        /**
         * @tv_overscan_property: Optional TV property to control the overscan
         * setting.
         */
        struct drm_property *tv_overscan_property;
        /**
         * @tv_saturation_property: Optional TV property to set the
         * saturation.
         */
        struct drm_property *tv_saturation_property;
        /**
         * @tv_hue_property: Optional TV property to set the hue.
         */
        struct drm_property *tv_hue_property;

        /**
         * @scaling_mode_property: Optional connector property to control the
         * upscaling, mostly used for built-in panels.
         */
        struct drm_property *scaling_mode_property;
        /**
         * @aspect_ratio_property: Optional connector property to control the
         * HDMI infoframe aspect ratio setting.
         */
        struct drm_property *aspect_ratio_property;
        /**
         * @degamma_lut_property: Optional CRTC property to set the LUT used to
         * convert the framebuffer's colors to linear gamma.
         */
        struct drm_property *degamma_lut_property;
        /**
         * @degamma_lut_size_property: Optional CRTC property for the size of
         * the degamma LUT as supported by the driver (read-only).
         */
        struct drm_property *degamma_lut_size_property;
        /**
         * @ctm_property: Optional CRTC property to set the
         * matrix used to convert colors after the lookup in the
         * degamma LUT.
         */
        struct drm_property *ctm_property;
        /**
         * @gamma_lut_property: Optional CRTC property to set the LUT used to
         * convert the colors, after the CTM matrix, to the gamma space of the
         * connected screen.
         */
        struct drm_property *gamma_lut_property;
        /**
         * @gamma_lut_size_property: Optional CRTC property for the size of the
         * gamma LUT as supported by the driver (read-only).
         */
        struct drm_property *gamma_lut_size_property;

        /**
         * @suggested_x_property: Optional connector property with a hint for
         * the position of the output on the host's screen.
         */
        struct drm_property *suggested_x_property;
        /**
         * @suggested_y_property: Optional connector property with a hint for
         * the position of the output on the host's screen.
         */
        struct drm_property *suggested_y_property;

        /* dumb ioctl parameters */
        uint32_t preferred_depth, prefer_shadow;

        /**
         * @async_page_flip: Does this device support async flips on the primary
         * plane?
         */
        bool async_page_flip;

        /**
         * @allow_fb_modifiers:
         *
         * Whether the driver supports fb modifiers in the ADDFB2.1 ioctl call.
         */
        bool allow_fb_modifiers;

        /* cursor size */
        uint32_t cursor_width, cursor_height;

        const struct drm_mode_config_helper_funcs *helper_private;
};

void drm_mode_config_init(struct drm_device *dev);
void drm_mode_config_reset(struct drm_device *dev);
void drm_mode_config_cleanup(struct drm_device *dev);

#endif