/*
 * Copyright (c) 2006-2008 Intel Corporation
 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
 * Copyright (c) 2008 Red Hat Inc.
 *
 * DRM core CRTC related functions
 *
 * 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.
 *
 * Authors:
 *      Keith Packard
 *      Eric Anholt <eric@anholt.net>
 *      Dave Airlie <airlied@linux.ie>
 *      Jesse Barnes <jesse.barnes@intel.com>
 */
#include <linux/ctype.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_modeset_lock.h>

#include "drm_crtc_internal.h"
#include "drm_internal.h"

static struct drm_framebuffer *add_framebuffer_internal(struct drm_device *dev,
                                                        struct drm_mode_fb_cmd2 *r,
                                                        struct drm_file *file_priv);

/* Avoid boilerplate.  I'm tired of typing. */
#define DRM_ENUM_NAME_FN(fnname, list)                          \
        const char *fnname(int val)                             \
        {                                                       \
                int i;                                          \
                for (i = 0; i < ARRAY_SIZE(list); i++) {        \
                        if (list[i].type == val)                \
                                return list[i].name;            \
                }                                               \
                return "(unknown)";                             \
        }

/*
 * Global properties
 */
static const struct drm_prop_enum_list drm_dpms_enum_list[] =
{       { DRM_MODE_DPMS_ON, "On" },
        { DRM_MODE_DPMS_STANDBY, "Standby" },
        { DRM_MODE_DPMS_SUSPEND, "Suspend" },
        { DRM_MODE_DPMS_OFF, "Off" }
};

DRM_ENUM_NAME_FN(drm_get_dpms_name, drm_dpms_enum_list)

static const struct drm_prop_enum_list drm_plane_type_enum_list[] =
{
        { DRM_PLANE_TYPE_OVERLAY, "Overlay" },
        { DRM_PLANE_TYPE_PRIMARY, "Primary" },
        { DRM_PLANE_TYPE_CURSOR, "Cursor" },
};

/*
 * Optional properties
 */
static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] =
{
        { DRM_MODE_SCALE_NONE, "None" },
        { DRM_MODE_SCALE_FULLSCREEN, "Full" },
        { DRM_MODE_SCALE_CENTER, "Center" },
        { DRM_MODE_SCALE_ASPECT, "Full aspect" },
};

static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = {
        { DRM_MODE_PICTURE_ASPECT_NONE, "Automatic" },
        { DRM_MODE_PICTURE_ASPECT_4_3, "4:3" },
        { DRM_MODE_PICTURE_ASPECT_16_9, "16:9" },
};

/*
 * Non-global properties, but "required" for certain connectors.
 */
static const struct drm_prop_enum_list drm_dvi_i_select_enum_list[] =
{
        { DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
        { DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
        { DRM_MODE_SUBCONNECTOR_DVIA,      "DVI-A"     }, /* DVI-I  */
};

DRM_ENUM_NAME_FN(drm_get_dvi_i_select_name, drm_dvi_i_select_enum_list)

static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] =
{
        { DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
        { DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
        { DRM_MODE_SUBCONNECTOR_DVIA,      "DVI-A"     }, /* DVI-I  */
};

DRM_ENUM_NAME_FN(drm_get_dvi_i_subconnector_name,
                 drm_dvi_i_subconnector_enum_list)

static const struct drm_prop_enum_list drm_tv_select_enum_list[] =
{
        { DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
        { DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
        { DRM_MODE_SUBCONNECTOR_SVIDEO,    "SVIDEO"    }, /* TV-out */
        { DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
        { DRM_MODE_SUBCONNECTOR_SCART,     "SCART"     }, /* TV-out */
};

DRM_ENUM_NAME_FN(drm_get_tv_select_name, drm_tv_select_enum_list)

static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] =
{
        { DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
        { DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
        { DRM_MODE_SUBCONNECTOR_SVIDEO,    "SVIDEO"    }, /* TV-out */
        { DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
        { DRM_MODE_SUBCONNECTOR_SCART,     "SCART"     }, /* TV-out */
};

DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
                 drm_tv_subconnector_enum_list)

static const struct drm_prop_enum_list drm_dirty_info_enum_list[] = {
        { DRM_MODE_DIRTY_OFF,      "Off"      },
        { DRM_MODE_DIRTY_ON,       "On"       },
        { DRM_MODE_DIRTY_ANNOTATE, "Annotate" },
};

struct drm_conn_prop_enum_list {
        int type;
        const char *name;
        struct ida ida;
};

/*
 * Connector and encoder types.
 */
static struct drm_conn_prop_enum_list drm_connector_enum_list[] =
{       { DRM_MODE_CONNECTOR_Unknown, "Unknown" },
        { DRM_MODE_CONNECTOR_VGA, "VGA" },
        { DRM_MODE_CONNECTOR_DVII, "DVI-I" },
        { DRM_MODE_CONNECTOR_DVID, "DVI-D" },
        { DRM_MODE_CONNECTOR_DVIA, "DVI-A" },
        { DRM_MODE_CONNECTOR_Composite, "Composite" },
        { DRM_MODE_CONNECTOR_SVIDEO, "SVIDEO" },
        { DRM_MODE_CONNECTOR_LVDS, "LVDS" },
        { DRM_MODE_CONNECTOR_Component, "Component" },
        { DRM_MODE_CONNECTOR_9PinDIN, "DIN" },
        { DRM_MODE_CONNECTOR_DisplayPort, "DP" },
        { DRM_MODE_CONNECTOR_HDMIA, "HDMI-A" },
        { DRM_MODE_CONNECTOR_HDMIB, "HDMI-B" },
        { DRM_MODE_CONNECTOR_TV, "TV" },
        { DRM_MODE_CONNECTOR_eDP, "eDP" },
        { DRM_MODE_CONNECTOR_VIRTUAL, "Virtual" },
        { DRM_MODE_CONNECTOR_DSI, "DSI" },
};

static const struct drm_prop_enum_list drm_encoder_enum_list[] =
{       { DRM_MODE_ENCODER_NONE, "None" },
        { DRM_MODE_ENCODER_DAC, "DAC" },
        { DRM_MODE_ENCODER_TMDS, "TMDS" },
        { DRM_MODE_ENCODER_LVDS, "LVDS" },
        { DRM_MODE_ENCODER_TVDAC, "TV" },
        { DRM_MODE_ENCODER_VIRTUAL, "Virtual" },
        { DRM_MODE_ENCODER_DSI, "DSI" },
        { DRM_MODE_ENCODER_DPMST, "DP MST" },
};

static const struct drm_prop_enum_list drm_subpixel_enum_list[] =
{
        { SubPixelUnknown, "Unknown" },
        { SubPixelHorizontalRGB, "Horizontal RGB" },
        { SubPixelHorizontalBGR, "Horizontal BGR" },
        { SubPixelVerticalRGB, "Vertical RGB" },
        { SubPixelVerticalBGR, "Vertical BGR" },
        { SubPixelNone, "None" },
};

void drm_connector_ida_init(void)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
                ida_init(&drm_connector_enum_list[i].ida);
}

void drm_connector_ida_destroy(void)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
                ida_destroy(&drm_connector_enum_list[i].ida);
}

/**
 * drm_get_connector_status_name - return a string for connector status
 * @status: connector status to compute name of
 *
 * In contrast to the other drm_get_*_name functions this one here returns a
 * const pointer and hence is threadsafe.
 */
const char *drm_get_connector_status_name(enum drm_connector_status status)
{
        if (status == connector_status_connected)
                return "connected";
        else if (status == connector_status_disconnected)
                return "disconnected";
        else
                return "unknown";
}
EXPORT_SYMBOL(drm_get_connector_status_name);

/**
 * drm_get_subpixel_order_name - return a string for a given subpixel enum
 * @order: enum of subpixel_order
 *
 * Note you could abuse this and return something out of bounds, but that
 * would be a caller error.  No unscrubbed user data should make it here.
 */
const char *drm_get_subpixel_order_name(enum subpixel_order order)
{
        return drm_subpixel_enum_list[order].name;
}
EXPORT_SYMBOL(drm_get_subpixel_order_name);

static char printable_char(int c)
{
        return isascii(c) && isprint(c) ? c : '?';
}

/**
 * drm_get_format_name - return a string for drm fourcc format
 * @format: format to compute name of
 *
 * Note that the buffer used by this function is globally shared and owned by
 * the function itself.
 *
 * FIXME: This isn't really multithreading safe.
 */
const char *drm_get_format_name(uint32_t format)
{
        static char buf[32];

        snprintf(buf, sizeof(buf),
                 "%c%c%c%c %s-endian (0x%08x)",
                 printable_char(format & 0xff),
                 printable_char((format >> 8) & 0xff),
                 printable_char((format >> 16) & 0xff),
                 printable_char((format >> 24) & 0x7f),
                 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
                 format);

        return buf;
}
EXPORT_SYMBOL(drm_get_format_name);

/*
 * Internal function to assign a slot in the object idr and optionally
 * register the object into the idr.
 */
static int drm_mode_object_get_reg(struct drm_device *dev,
                                   struct drm_mode_object *obj,
                                   uint32_t obj_type,
                                   bool register_obj)
{
        int ret;

        mutex_lock(&dev->mode_config.idr_mutex);
        ret = idr_alloc(&dev->mode_config.crtc_idr, register_obj ? obj : NULL, 1, 0, GFP_KERNEL);
        if (ret >= 0) {
                /*
                 * Set up the object linking under the protection of the idr
                 * lock so that other users can't see inconsistent state.
                 */
                obj->id = ret;
                obj->type = obj_type;
        }
        mutex_unlock(&dev->mode_config.idr_mutex);

        return ret < 0 ? ret : 0;
}

/**
 * drm_mode_object_get - allocate a new modeset identifier
 * @dev: DRM device
 * @obj: object pointer, used to generate unique ID
 * @obj_type: object type
 *
 * Create a unique identifier based on @ptr in @dev's identifier space.  Used
 * for tracking modes, CRTCs and connectors. Note that despite the _get postfix
 * modeset identifiers are _not_ reference counted. Hence don't use this for
 * reference counted modeset objects like framebuffers.
 *
 * Returns:
 * New unique (relative to other objects in @dev) integer identifier for the
 * object.
 */
int drm_mode_object_get(struct drm_device *dev,
                        struct drm_mode_object *obj, uint32_t obj_type)
{
        return drm_mode_object_get_reg(dev, obj, obj_type, true);
}

static void drm_mode_object_register(struct drm_device *dev,
                                     struct drm_mode_object *obj)
{
        mutex_lock(&dev->mode_config.idr_mutex);
        idr_replace(&dev->mode_config.crtc_idr, obj, obj->id);
        mutex_unlock(&dev->mode_config.idr_mutex);
}

/**
 * drm_mode_object_put - free a modeset identifer
 * @dev: DRM device
 * @object: object to free
 *
 * Free @id from @dev's unique identifier pool. Note that despite the _get
 * postfix modeset identifiers are _not_ reference counted. Hence don't use this
 * for reference counted modeset objects like framebuffers.
 */
void drm_mode_object_put(struct drm_device *dev,
                         struct drm_mode_object *object)
{
        mutex_lock(&dev->mode_config.idr_mutex);
        idr_remove(&dev->mode_config.crtc_idr, object->id);
        mutex_unlock(&dev->mode_config.idr_mutex);
}

static struct drm_mode_object *_object_find(struct drm_device *dev,
                uint32_t id, uint32_t type)
{
        struct drm_mode_object *obj = NULL;

        mutex_lock(&dev->mode_config.idr_mutex);
        obj = idr_find(&dev->mode_config.crtc_idr, id);
        if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type)
                obj = NULL;
        if (obj && obj->id != id)
                obj = NULL;
        /* don't leak out unref'd fb's */
        if (obj && (obj->type == DRM_MODE_OBJECT_FB))
                obj = NULL;
        mutex_unlock(&dev->mode_config.idr_mutex);

        return obj;
}

/**
 * drm_mode_object_find - look up a drm object with static lifetime
 * @dev: drm device
 * @id: id of the mode object
 * @type: type of the mode object
 *
 * Note that framebuffers cannot be looked up with this functions - since those
 * are reference counted, they need special treatment.  Even with
 * DRM_MODE_OBJECT_ANY (although that will simply return NULL
 * rather than WARN_ON()).
 */
struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
                uint32_t id, uint32_t type)
{
        struct drm_mode_object *obj = NULL;

        /* Framebuffers are reference counted and need their own lookup
         * function.*/
        WARN_ON(type == DRM_MODE_OBJECT_FB);
        obj = _object_find(dev, id, type);
        return obj;
}
EXPORT_SYMBOL(drm_mode_object_find);

/**
 * drm_framebuffer_init - initialize a framebuffer
 * @dev: DRM device
 * @fb: framebuffer to be initialized
 * @funcs: ... with these functions
 *
 * Allocates an ID for the framebuffer's parent mode object, sets its mode
 * functions & device file and adds it to the master fd list.
 *
 * IMPORTANT:
 * This functions publishes the fb and makes it available for concurrent access
 * by other users. Which means by this point the fb _must_ be fully set up -
 * since all the fb attributes are invariant over its lifetime, no further
 * locking but only correct reference counting is required.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
                         const struct drm_framebuffer_funcs *funcs)
{
        int ret;

        mutex_lock(&dev->mode_config.fb_lock);
        kref_init(&fb->refcount);
        INIT_LIST_HEAD(&fb->filp_head);
        fb->dev = dev;
        fb->funcs = funcs;

        ret = drm_mode_object_get(dev, &fb->base, DRM_MODE_OBJECT_FB);
        if (ret)
                goto out;

        dev->mode_config.num_fb++;
        list_add(&fb->head, &dev->mode_config.fb_list);
out:
        mutex_unlock(&dev->mode_config.fb_lock);

        return 0;
}
EXPORT_SYMBOL(drm_framebuffer_init);

/* dev->mode_config.fb_lock must be held! */
static void __drm_framebuffer_unregister(struct drm_device *dev,
                                         struct drm_framebuffer *fb)
{
        mutex_lock(&dev->mode_config.idr_mutex);
        idr_remove(&dev->mode_config.crtc_idr, fb->base.id);
        mutex_unlock(&dev->mode_config.idr_mutex);

        fb->base.id = 0;
}

static void drm_framebuffer_free(struct kref *kref)
{
        struct drm_framebuffer *fb =
                        container_of(kref, struct drm_framebuffer, refcount);
        struct drm_device *dev = fb->dev;

        /*
         * The lookup idr holds a weak reference, which has not necessarily been
         * removed at this point. Check for that.
         */
        mutex_lock(&dev->mode_config.fb_lock);
        if (fb->base.id) {
                /* Mark fb as reaped and drop idr ref. */
                __drm_framebuffer_unregister(dev, fb);
        }
        mutex_unlock(&dev->mode_config.fb_lock);

        fb->funcs->destroy(fb);
}

static struct drm_framebuffer *__drm_framebuffer_lookup(struct drm_device *dev,
                                                        uint32_t id)
{
        struct drm_mode_object *obj = NULL;
        struct drm_framebuffer *fb;

        mutex_lock(&dev->mode_config.idr_mutex);
        obj = idr_find(&dev->mode_config.crtc_idr, id);
        if (!obj || (obj->type != DRM_MODE_OBJECT_FB) || (obj->id != id))
                fb = NULL;
        else
                fb = obj_to_fb(obj);
        mutex_unlock(&dev->mode_config.idr_mutex);

        return fb;
}

/**
 * drm_framebuffer_lookup - look up a drm framebuffer and grab a reference
 * @dev: drm device
 * @id: id of the fb object
 *
 * If successful, this grabs an additional reference to the framebuffer -
 * callers need to make sure to eventually unreference the returned framebuffer
 * again, using @drm_framebuffer_unreference.
 */
struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
                                               uint32_t id)
{
        struct drm_framebuffer *fb;

        mutex_lock(&dev->mode_config.fb_lock);
        fb = __drm_framebuffer_lookup(dev, id);
        if (fb) {
                if (!kref_get_unless_zero(&fb->refcount))
                        fb = NULL;
        }
        mutex_unlock(&dev->mode_config.fb_lock);

        return fb;
}
EXPORT_SYMBOL(drm_framebuffer_lookup);

/**
 * drm_framebuffer_unreference - unref a framebuffer
 * @fb: framebuffer to unref
 *
 * This functions decrements the fb's refcount and frees it if it drops to zero.
 */
void drm_framebuffer_unreference(struct drm_framebuffer *fb)
{
        DRM_DEBUG("%p: FB ID: %d (%d)\n", fb, fb->base.id, atomic_read(&fb->refcount.refcount));
        kref_put(&fb->refcount, drm_framebuffer_free);
}
EXPORT_SYMBOL(drm_framebuffer_unreference);

/**
 * drm_framebuffer_reference - incr the fb refcnt
 * @fb: framebuffer
 *
 * This functions increments the fb's refcount.
 */
void drm_framebuffer_reference(struct drm_framebuffer *fb)
{
        DRM_DEBUG("%p: FB ID: %d (%d)\n", fb, fb->base.id, atomic_read(&fb->refcount.refcount));
        kref_get(&fb->refcount);
}
EXPORT_SYMBOL(drm_framebuffer_reference);

static void drm_framebuffer_free_bug(struct kref *kref)
{
        BUG();
}

static void __drm_framebuffer_unreference(struct drm_framebuffer *fb)
{
        DRM_DEBUG("%p: FB ID: %d (%d)\n", fb, fb->base.id, atomic_read(&fb->refcount.refcount));
        kref_put(&fb->refcount, drm_framebuffer_free_bug);
}

/**
 * drm_framebuffer_unregister_private - unregister a private fb from the lookup idr
 * @fb: fb to unregister
 *
 * Drivers need to call this when cleaning up driver-private framebuffers, e.g.
 * those used for fbdev. Note that the caller must hold a reference of it's own,
 * i.e. the object may not be destroyed through this call (since it'll lead to a
 * locking inversion).
 */
void drm_framebuffer_unregister_private(struct drm_framebuffer *fb)
{
        struct drm_device *dev = fb->dev;

        mutex_lock(&dev->mode_config.fb_lock);
        /* Mark fb as reaped and drop idr ref. */
        __drm_framebuffer_unregister(dev, fb);
        mutex_unlock(&dev->mode_config.fb_lock);
}
EXPORT_SYMBOL(drm_framebuffer_unregister_private);

/**
 * drm_framebuffer_cleanup - remove a framebuffer object
 * @fb: framebuffer to remove
 *
 * Cleanup framebuffer. This function is intended to be used from the drivers
 * ->destroy callback. It can also be used to clean up driver private
 *  framebuffers embedded into a larger structure.
 *
 * Note that this function does not remove the fb from active usuage - if it is
 * still used anywhere, hilarity can ensue since userspace could call getfb on
 * the id and get back -EINVAL. Obviously no concern at driver unload time.
 *
 * Also, the framebuffer will not be removed from the lookup idr - for
 * user-created framebuffers this will happen in in the rmfb ioctl. For
 * driver-private objects (e.g. for fbdev) drivers need to explicitly call
 * drm_framebuffer_unregister_private.
 */
void drm_framebuffer_cleanup(struct drm_framebuffer *fb)
{
        struct drm_device *dev = fb->dev;

        mutex_lock(&dev->mode_config.fb_lock);
        list_del(&fb->head);
        dev->mode_config.num_fb--;
        mutex_unlock(&dev->mode_config.fb_lock);
}
EXPORT_SYMBOL(drm_framebuffer_cleanup);

/**
 * drm_framebuffer_remove - remove and unreference a framebuffer object
 * @fb: framebuffer to remove
 *
 * Scans all the CRTCs and planes in @dev's mode_config.  If they're
 * using @fb, removes it, setting it to NULL. Then drops the reference to the
 * passed-in framebuffer. Might take the modeset locks.
 *
 * Note that this function optimizes the cleanup away if the caller holds the
 * last reference to the framebuffer. It is also guaranteed to not take the
 * modeset locks in this case.
 */
void drm_framebuffer_remove(struct drm_framebuffer *fb)
{
        struct drm_device *dev = fb->dev;
        struct drm_crtc *crtc;
        struct drm_plane *plane;
        struct drm_mode_set set;
        int ret;

        WARN_ON(!list_empty(&fb->filp_head));

        /*
         * drm ABI mandates that we remove any deleted framebuffers from active
         * useage. But since most sane clients only remove framebuffers they no
         * longer need, try to optimize this away.
         *
         * Since we're holding a reference ourselves, observing a refcount of 1
         * means that we're the last holder and can skip it. Also, the refcount
         * can never increase from 1 again, so we don't need any barriers or
         * locks.
         *
         * Note that userspace could try to race with use and instate a new
         * usage _after_ we've cleared all current ones. End result will be an
         * in-use fb with fb-id == 0. Userspace is allowed to shoot its own foot
         * in this manner.
         */
        if (atomic_read(&fb->refcount.refcount) > 1) {
                drm_modeset_lock_all(dev);
                /* remove from any CRTC */
                list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                        if (crtc->primary->fb == fb) {
                                /* should turn off the crtc */
                                memset(&set, 0, sizeof(struct drm_mode_set));
                                set.crtc = crtc;
                                set.fb = NULL;
                                ret = drm_mode_set_config_internal(&set);
                                if (ret)
                                        DRM_ERROR("failed to reset crtc %p when fb was deleted\n", crtc);
                        }
                }

                list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
                        if (plane->fb == fb)
                                drm_plane_force_disable(plane);
                }
                drm_modeset_unlock_all(dev);
        }

        drm_framebuffer_unreference(fb);
}
EXPORT_SYMBOL(drm_framebuffer_remove);

DEFINE_WW_CLASS(crtc_ww_class);

/**
 * drm_crtc_init_with_planes - Initialise a new CRTC object with
 *    specified primary and cursor planes.
 * @dev: DRM device
 * @crtc: CRTC object to init
 * @primary: Primary plane for CRTC
 * @cursor: Cursor plane for CRTC
 * @funcs: callbacks for the new CRTC
 *
 * Inits a new object created as base part of a driver crtc object.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
                              struct drm_plane *primary,
                              struct drm_plane *cursor,
                              const struct drm_crtc_funcs *funcs)
{
        struct drm_mode_config *config = &dev->mode_config;
        int ret;

        crtc->dev = dev;
        crtc->funcs = funcs;
        crtc->invert_dimensions = false;

        drm_modeset_lock_init(&crtc->mutex);
        ret = drm_mode_object_get(dev, &crtc->base, DRM_MODE_OBJECT_CRTC);
        if (ret)
                return ret;

        crtc->base.properties = &crtc->properties;

        list_add_tail(&crtc->head, &config->crtc_list);
        config->num_crtc++;

        crtc->primary = primary;
        crtc->cursor = cursor;
        if (primary)
                primary->possible_crtcs = 1 << drm_crtc_index(crtc);
        if (cursor)
                cursor->possible_crtcs = 1 << drm_crtc_index(crtc);

        return 0;
}
EXPORT_SYMBOL(drm_crtc_init_with_planes);

/**
 * drm_crtc_cleanup - Clean up the core crtc usage
 * @crtc: CRTC to cleanup
 *
 * This function cleans up @crtc and removes it from the DRM mode setting
 * core. Note that the function does *not* free the crtc structure itself,
 * this is the responsibility of the caller.
 */
void drm_crtc_cleanup(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;

        kfree(crtc->gamma_store);
        crtc->gamma_store = NULL;

        drm_modeset_lock_fini(&crtc->mutex);

        drm_mode_object_put(dev, &crtc->base);
        list_del(&crtc->head);
        dev->mode_config.num_crtc--;

        WARN_ON(crtc->state && !crtc->funcs->atomic_destroy_state);
        if (crtc->state && crtc->funcs->atomic_destroy_state)
                crtc->funcs->atomic_destroy_state(crtc, crtc->state);

        memset(crtc, 0, sizeof(*crtc));
}
EXPORT_SYMBOL(drm_crtc_cleanup);

/**
 * drm_crtc_index - find the index of a registered CRTC
 * @crtc: CRTC to find index for
 *
 * Given a registered CRTC, return the index of that CRTC within a DRM
 * device's list of CRTCs.
 */
unsigned int drm_crtc_index(struct drm_crtc *crtc)
{
        unsigned int index = 0;
        struct drm_crtc *tmp;

        list_for_each_entry(tmp, &crtc->dev->mode_config.crtc_list, head) {
                if (tmp == crtc)
                        return index;

                index++;
        }

        BUG();
}
EXPORT_SYMBOL(drm_crtc_index);

/*
 * drm_mode_remove - remove and free a mode
 * @connector: connector list to modify
 * @mode: mode to remove
 *
 * Remove @mode from @connector's mode list, then free it.
 */
static void drm_mode_remove(struct drm_connector *connector,
                            struct drm_display_mode *mode)
{
        list_del(&mode->head);
        drm_mode_destroy(connector->dev, mode);
}

/**
 * drm_connector_get_cmdline_mode - reads the user's cmdline mode
 * @connector: connector to quwery
 *
 * The kernel supports per-connector configration of its consoles through
 * use of the video= parameter. This function parses that option and
 * extracts the user's specified mode (or enable/disable status) for a
 * particular connector. This is typically only used during the early fbdev
 * setup.
 */
static void drm_connector_get_cmdline_mode(struct drm_connector *connector)
{
        struct drm_cmdline_mode *mode = &connector->cmdline_mode;
        char *option = NULL;

        if (fb_get_options(connector->name, &option))
                return;

        if (!drm_mode_parse_command_line_for_connector(option,
                                                       connector,
                                                       mode))
                return;

        if (mode->force) {
                const char *s;

                switch (mode->force) {
                case DRM_FORCE_OFF:
                        s = "OFF";
                        break;
                case DRM_FORCE_ON_DIGITAL:
                        s = "ON - dig";
                        break;
                default:
                case DRM_FORCE_ON:
                        s = "ON";
                        break;
                }

                DRM_INFO("forcing %s connector %s\n", connector->name, s);
                connector->force = mode->force;
        }

        DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
                      connector->name,
                      mode->xres, mode->yres,
                      mode->refresh_specified ? mode->refresh : 60,
                      mode->rb ? " reduced blanking" : "",
                      mode->margins ? " with margins" : "",
                      mode->interlace ?  " interlaced" : "");
}

/**
 * drm_connector_init - Init a preallocated connector
 * @dev: DRM device
 * @connector: the connector to init
 * @funcs: callbacks for this connector
 * @connector_type: user visible type of the connector
 *
 * Initialises a preallocated connector. Connectors should be
 * subclassed as part of driver connector objects.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_connector_init(struct drm_device *dev,
                       struct drm_connector *connector,
                       const struct drm_connector_funcs *funcs,
                       int connector_type)
{
        int ret;
        struct ida *connector_ida =
                &drm_connector_enum_list[connector_type].ida;

        drm_modeset_lock_all(dev);

        ret = drm_mode_object_get_reg(dev, &connector->base, DRM_MODE_OBJECT_CONNECTOR, false);
        if (ret)
                goto out_unlock;

        connector->base.properties = &connector->properties;
        connector->dev = dev;
        connector->funcs = funcs;
        connector->connector_type = connector_type;
        connector->connector_type_id =
                ida_simple_get(connector_ida, 1, 0, GFP_KERNEL);
        if (connector->connector_type_id < 0) {
                ret = connector->connector_type_id;
                goto out_put;
        }
        connector->name =
                kasprintf(GFP_KERNEL, "%s-%d",
                          drm_connector_enum_list[connector_type].name,
                          connector->connector_type_id);
        if (!connector->name) {
                ret = -ENOMEM;
                goto out_put;
        }

        INIT_LIST_HEAD(&connector->probed_modes);
        INIT_LIST_HEAD(&connector->modes);
        connector->edid_blob_ptr = NULL;
        connector->status = connector_status_unknown;

        drm_connector_get_cmdline_mode(connector);

        /* We should add connectors at the end to avoid upsetting the connector
         * index too much. */
        list_add_tail(&connector->head, &dev->mode_config.connector_list);
        dev->mode_config.num_connector++;

        if (connector_type != DRM_MODE_CONNECTOR_VIRTUAL)
                drm_object_attach_property(&connector->base,
                                              dev->mode_config.edid_property,
                                              0);

        drm_object_attach_property(&connector->base,
                                      dev->mode_config.dpms_property, 0);

        connector->debugfs_entry = NULL;

out_put:
        if (ret)
                drm_mode_object_put(dev, &connector->base);

out_unlock:
        drm_modeset_unlock_all(dev);

        return ret;
}
EXPORT_SYMBOL(drm_connector_init);

/**
 * drm_connector_cleanup - cleans up an initialised connector
 * @connector: connector to cleanup
 *
 * Cleans up the connector but doesn't free the object.
 */
void drm_connector_cleanup(struct drm_connector *connector)
{
        struct drm_device *dev = connector->dev;
        struct drm_display_mode *mode, *t;

        if (connector->tile_group) {
                drm_mode_put_tile_group(dev, connector->tile_group);
                connector->tile_group = NULL;
        }

        list_for_each_entry_safe(mode, t, &connector->probed_modes, head)
                drm_mode_remove(connector, mode);

        list_for_each_entry_safe(mode, t, &connector->modes, head)
                drm_mode_remove(connector, mode);

        ida_remove(&drm_connector_enum_list[connector->connector_type].ida,
                   connector->connector_type_id);

        drm_mode_object_put(dev, &connector->base);
        kfree(connector->name);
        connector->name = NULL;
        list_del(&connector->head);
        dev->mode_config.num_connector--;

        WARN_ON(connector->state && !connector->funcs->atomic_destroy_state);
        if (connector->state && connector->funcs->atomic_destroy_state)
                connector->funcs->atomic_destroy_state(connector,
                                                       connector->state);

        memset(connector, 0, sizeof(*connector));
}
EXPORT_SYMBOL(drm_connector_cleanup);

/**
 * drm_connector_index - find the index of a registered connector
 * @connector: connector to find index for
 *
 * Given a registered connector, return the index of that connector within a DRM
 * device's list of connectors.
 */
unsigned int drm_connector_index(struct drm_connector *connector)
{
        unsigned int index = 0;
        struct drm_connector *tmp;
        struct drm_mode_config *config = &connector->dev->mode_config;

        WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));

        list_for_each_entry(tmp, &connector->dev->mode_config.connector_list, head) {
                if (tmp == connector)
                        return index;

                index++;
        }

        BUG();
}
EXPORT_SYMBOL(drm_connector_index);

/**
 * drm_connector_register - register a connector
 * @connector: the connector to register
 *
 * Register userspace interfaces for a connector
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_connector_register(struct drm_connector *connector)
{
        int ret;

        drm_mode_object_register(connector->dev, &connector->base);

        ret = drm_sysfs_connector_add(connector);
        if (ret)
                return ret;

        ret = drm_debugfs_connector_add(connector);
        if (ret) {
                drm_sysfs_connector_remove(connector);
                return ret;
        }

        return 0;
}
EXPORT_SYMBOL(drm_connector_register);

/**
 * drm_connector_unregister - unregister a connector
 * @connector: the connector to unregister
 *

 * Unregister userspace interfaces for a connector
 */
void drm_connector_unregister(struct drm_connector *connector)
{
        drm_sysfs_connector_remove(connector);
        drm_debugfs_connector_remove(connector);
}
EXPORT_SYMBOL(drm_connector_unregister);


/**
 * drm_connector_unplug_all - unregister connector userspace interfaces
 * @dev: drm device
 *
 * This function unregisters all connector userspace interfaces in sysfs. Should
 * be call when the device is disconnected, e.g. from an usb driver's
 * ->disconnect callback.
 */
void drm_connector_unplug_all(struct drm_device *dev)
{
        struct drm_connector *connector;

        /* taking the mode config mutex ends up in a clash with sysfs */
        list_for_each_entry(connector, &dev->mode_config.connector_list, head)
                drm_connector_unregister(connector);

}
EXPORT_SYMBOL(drm_connector_unplug_all);

/**
 * drm_bridge_init - initialize a drm transcoder/bridge
 * @dev: drm device
 * @bridge: transcoder/bridge to set up
 * @funcs: bridge function table
 *
 * Initialises a preallocated bridge. Bridges should be
 * subclassed as part of driver connector objects.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_bridge_init(struct drm_device *dev, struct drm_bridge *bridge,
                const struct drm_bridge_funcs *funcs)
{
        int ret;

        drm_modeset_lock_all(dev);

        ret = drm_mode_object_get(dev, &bridge->base, DRM_MODE_OBJECT_BRIDGE);
        if (ret)
                goto out;

        bridge->dev = dev;
        bridge->funcs = funcs;

        list_add_tail(&bridge->head, &dev->mode_config.bridge_list);
        dev->mode_config.num_bridge++;

 out:
        drm_modeset_unlock_all(dev);
        return ret;
}
EXPORT_SYMBOL(drm_bridge_init);

/**
 * drm_bridge_cleanup - cleans up an initialised bridge
 * @bridge: bridge to cleanup
 *
 * Cleans up the bridge but doesn't free the object.
 */
void drm_bridge_cleanup(struct drm_bridge *bridge)
{
        struct drm_device *dev = bridge->dev;

        drm_modeset_lock_all(dev);
        drm_mode_object_put(dev, &bridge->base);
        list_del(&bridge->head);
        dev->mode_config.num_bridge--;
        drm_modeset_unlock_all(dev);

        memset(bridge, 0, sizeof(*bridge));
}
EXPORT_SYMBOL(drm_bridge_cleanup);

/**
 * drm_encoder_init - Init a preallocated encoder
 * @dev: drm device
 * @encoder: the encoder to init
 * @funcs: callbacks for this encoder
 * @encoder_type: user visible type of the encoder
 *
 * Initialises a preallocated encoder. Encoder should be
 * subclassed as part of driver encoder objects.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_encoder_init(struct drm_device *dev,
                      struct drm_encoder *encoder,
                      const struct drm_encoder_funcs *funcs,
                      int encoder_type)
{
        int ret;

        drm_modeset_lock_all(dev);

        ret = drm_mode_object_get(dev, &encoder->base, DRM_MODE_OBJECT_ENCODER);
        if (ret)
                goto out_unlock;

        encoder->dev = dev;
        encoder->encoder_type = encoder_type;
        encoder->funcs = funcs;
        encoder->name = kasprintf(GFP_KERNEL, "%s-%d",
                                  drm_encoder_enum_list[encoder_type].name,
                                  encoder->base.id);
        if (!encoder->name) {
                ret = -ENOMEM;
                goto out_put;
        }

        list_add_tail(&encoder->head, &dev->mode_config.encoder_list);
        dev->mode_config.num_encoder++;

out_put:
        if (ret)
                drm_mode_object_put(dev, &encoder->base);

out_unlock:
        drm_modeset_unlock_all(dev);

        return ret;
}
EXPORT_SYMBOL(drm_encoder_init);

/**
 * drm_encoder_cleanup - cleans up an initialised encoder
 * @encoder: encoder to cleanup
 *
 * Cleans up the encoder but doesn't free the object.
 */
void drm_encoder_cleanup(struct drm_encoder *encoder)
{
        struct drm_device *dev = encoder->dev;
        drm_modeset_lock_all(dev);
        drm_mode_object_put(dev, &encoder->base);
        kfree(encoder->name);
        list_del(&encoder->head);
        dev->mode_config.num_encoder--;
        drm_modeset_unlock_all(dev);

        memset(encoder, 0, sizeof(*encoder));
}
EXPORT_SYMBOL(drm_encoder_cleanup);

/**
 * drm_universal_plane_init - Initialize a new universal plane object
 * @dev: DRM device
 * @plane: plane object to init
 * @possible_crtcs: bitmask of possible CRTCs
 * @funcs: callbacks for the new plane
 * @formats: array of supported formats (%DRM_FORMAT_*)
 * @format_count: number of elements in @formats
 * @type: type of plane (overlay, primary, cursor)
 *
 * Initializes a plane object of type @type.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
                             unsigned long possible_crtcs,
                             const struct drm_plane_funcs *funcs,
                             const uint32_t *formats, uint32_t format_count,
                             enum drm_plane_type type)
{
        int ret;

        ret = drm_mode_object_get(dev, &plane->base, DRM_MODE_OBJECT_PLANE);
        if (ret)
                return ret;

        drm_modeset_lock_init(&plane->mutex);

        plane->base.properties = &plane->properties;
        plane->dev = dev;
        plane->funcs = funcs;
        plane->format_types = kmalloc(sizeof(uint32_t) * format_count,
                                      GFP_KERNEL);
        if (!plane->format_types) {
                DRM_DEBUG_KMS("out of memory when allocating plane\n");
                drm_mode_object_put(dev, &plane->base);
                return -ENOMEM;
        }

        memcpy(plane->format_types, formats, format_count * sizeof(uint32_t));
        plane->format_count = format_count;
        plane->possible_crtcs = possible_crtcs;
        plane->type = type;

        list_add_tail(&plane->head, &dev->mode_config.plane_list);
        dev->mode_config.num_total_plane++;
        if (plane->type == DRM_PLANE_TYPE_OVERLAY)
                dev->mode_config.num_overlay_plane++;

        drm_object_attach_property(&plane->base,
                                   dev->mode_config.plane_type_property,
                                   plane->type);

        return 0;
}
EXPORT_SYMBOL(drm_universal_plane_init);

/**
 * drm_plane_init - Initialize a legacy plane
 * @dev: DRM device
 * @plane: plane object to init
 * @possible_crtcs: bitmask of possible CRTCs
 * @funcs: callbacks for the new plane
 * @formats: array of supported formats (%DRM_FORMAT_*)
 * @format_count: number of elements in @formats
 * @is_primary: plane type (primary vs overlay)
 *
 * Legacy API to initialize a DRM plane.
 *
 * New drivers should call drm_universal_plane_init() instead.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_plane_init(struct drm_device *dev, struct drm_plane *plane,
                   unsigned long possible_crtcs,
                   const struct drm_plane_funcs *funcs,
                   const uint32_t *formats, uint32_t format_count,
                   bool is_primary)
{
        enum drm_plane_type type;

        type = is_primary ? DRM_PLANE_TYPE_PRIMARY : DRM_PLANE_TYPE_OVERLAY;
        return drm_universal_plane_init(dev, plane, possible_crtcs, funcs,
                                        formats, format_count, type);
}
EXPORT_SYMBOL(drm_plane_init);

/**
 * drm_plane_cleanup - Clean up the core plane usage
 * @plane: plane to cleanup
 *
 * This function cleans up @plane and removes it from the DRM mode setting
 * core. Note that the function does *not* free the plane structure itself,
 * this is the responsibility of the caller.
 */
void drm_plane_cleanup(struct drm_plane *plane)
{
        struct drm_device *dev = plane->dev;

        drm_modeset_lock_all(dev);
        kfree(plane->format_types);
        drm_mode_object_put(dev, &plane->base);

        BUG_ON(list_empty(&plane->head));

        list_del(&plane->head);
        dev->mode_config.num_total_plane--;
        if (plane->type == DRM_PLANE_TYPE_OVERLAY)
                dev->mode_config.num_overlay_plane--;
        drm_modeset_unlock_all(dev);

        WARN_ON(plane->state && !plane->funcs->atomic_destroy_state);
        if (plane->state && plane->funcs->atomic_destroy_state)
                plane->funcs->atomic_destroy_state(plane, plane->state);

        memset(plane, 0, sizeof(*plane));
}
EXPORT_SYMBOL(drm_plane_cleanup);

/**
 * drm_plane_index - find the index of a registered plane
 * @plane: plane to find index for
 *
 * Given a registered plane, return the index of that CRTC within a DRM
 * device's list of planes.
 */
unsigned int drm_plane_index(struct drm_plane *plane)
{
        unsigned int index = 0;
        struct drm_plane *tmp;

        list_for_each_entry(tmp, &plane->dev->mode_config.plane_list, head) {
                if (tmp == plane)
                        return index;

                index++;
        }

        BUG();
}
EXPORT_SYMBOL(drm_plane_index);

/**
 * drm_plane_force_disable - Forcibly disable a plane
 * @plane: plane to disable
 *
 * Forces the plane to be disabled.
 *
 * Used when the plane's current framebuffer is destroyed,
 * and when restoring fbdev mode.
 */
void drm_plane_force_disable(struct drm_plane *plane)
{
        int ret;

        if (!plane->fb)
                return;

        plane->old_fb = plane->fb;
        ret = plane->funcs->disable_plane(plane);
        if (ret) {
                DRM_ERROR("failed to disable plane with busy fb\n");
                plane->old_fb = NULL;
                return;
        }
        /* disconnect the plane from the fb and crtc: */
        __drm_framebuffer_unreference(plane->old_fb);
        plane->old_fb = NULL;
        plane->fb = NULL;
        plane->crtc = NULL;
}
EXPORT_SYMBOL(drm_plane_force_disable);

static int drm_mode_create_standard_connector_properties(struct drm_device *dev)
{
        struct drm_property *edid;
        struct drm_property *dpms;
        struct drm_property *dev_path;

        /*
         * Standard properties (apply to all connectors)
         */
        edid = drm_property_create(dev, DRM_MODE_PROP_BLOB |
                                   DRM_MODE_PROP_IMMUTABLE,
                                   "EDID", 0);
        dev->mode_config.edid_property = edid;

        dpms = drm_property_create_enum(dev, 0,
                                   "DPMS", drm_dpms_enum_list,
                                   ARRAY_SIZE(drm_dpms_enum_list));
        dev->mode_config.dpms_property = dpms;

        dev_path = drm_property_create(dev,
                                       DRM_MODE_PROP_BLOB |
                                       DRM_MODE_PROP_IMMUTABLE,
                                       "PATH", 0);
        dev->mode_config.path_property = dev_path;

        dev->mode_config.tile_property = drm_property_create(dev,
                                                             DRM_MODE_PROP_BLOB |
                                                             DRM_MODE_PROP_IMMUTABLE,
                                                             "TILE", 0);

        return 0;
}

static int drm_mode_create_standard_plane_properties(struct drm_device *dev)
{
        struct drm_property *type;

        /*
         * Standard properties (apply to all planes)
         */
        type = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
                                        "type", drm_plane_type_enum_list,
                                        ARRAY_SIZE(drm_plane_type_enum_list));
        dev->mode_config.plane_type_property = type;

        return 0;
}

/**
 * drm_mode_create_dvi_i_properties - create DVI-I specific connector properties
 * @dev: DRM device
 *
 * Called by a driver the first time a DVI-I connector is made.
 */
int drm_mode_create_dvi_i_properties(struct drm_device *dev)
{
        struct drm_property *dvi_i_selector;
        struct drm_property *dvi_i_subconnector;

        if (dev->mode_config.dvi_i_select_subconnector_property)
                return 0;

        dvi_i_selector =
                drm_property_create_enum(dev, 0,
                                    "select subconnector",
                                    drm_dvi_i_select_enum_list,
                                    ARRAY_SIZE(drm_dvi_i_select_enum_list));
        dev->mode_config.dvi_i_select_subconnector_property = dvi_i_selector;

        dvi_i_subconnector = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
                                    "subconnector",
                                    drm_dvi_i_subconnector_enum_list,
                                    ARRAY_SIZE(drm_dvi_i_subconnector_enum_list));
        dev->mode_config.dvi_i_subconnector_property = dvi_i_subconnector;

        return 0;
}
EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);

/**
 * drm_create_tv_properties - create TV specific connector properties
 * @dev: DRM device
 * @num_modes: number of different TV formats (modes) supported
 * @modes: array of pointers to strings containing name of each format
 *
 * Called by a driver's TV initialization routine, this function creates
 * the TV specific connector properties for a given device.  Caller is
 * responsible for allocating a list of format names and passing them to
 * this routine.
 */
int drm_mode_create_tv_properties(struct drm_device *dev,
                                  unsigned int num_modes,
                                  char *modes[])
{
        struct drm_property *tv_selector;
        struct drm_property *tv_subconnector;
        unsigned int i;

        if (dev->mode_config.tv_select_subconnector_property)
                return 0;

        /*
         * Basic connector properties
         */
        tv_selector = drm_property_create_enum(dev, 0,
                                          "select subconnector",
                                          drm_tv_select_enum_list,
                                          ARRAY_SIZE(drm_tv_select_enum_list));
        dev->mode_config.tv_select_subconnector_property = tv_selector;

        tv_subconnector =
                drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
                                    "subconnector",
                                    drm_tv_subconnector_enum_list,
                                    ARRAY_SIZE(drm_tv_subconnector_enum_list));
        dev->mode_config.tv_subconnector_property = tv_subconnector;

        /*
         * Other, TV specific properties: margins & TV modes.
         */
        dev->mode_config.tv_left_margin_property =
                drm_property_create_range(dev, 0, "left margin", 0, 100);

        dev->mode_config.tv_right_margin_property =
                drm_property_create_range(dev, 0, "right margin", 0, 100);

        dev->mode_config.tv_top_margin_property =
                drm_property_create_range(dev, 0, "top margin", 0, 100);

        dev->mode_config.tv_bottom_margin_property =
                drm_property_create_range(dev, 0, "bottom margin", 0, 100);

        dev->mode_config.tv_mode_property =
                drm_property_create(dev, DRM_MODE_PROP_ENUM,
                                    "mode", num_modes);
        for (i = 0; i < num_modes; i++)
                drm_property_add_enum(dev->mode_config.tv_mode_property, i,
                                      i, modes[i]);

        dev->mode_config.tv_brightness_property =
                drm_property_create_range(dev, 0, "brightness", 0, 100);

        dev->mode_config.tv_contrast_property =
                drm_property_create_range(dev, 0, "contrast", 0, 100);

        dev->mode_config.tv_flicker_reduction_property =
                drm_property_create_range(dev, 0, "flicker reduction", 0, 100);

        dev->mode_config.tv_overscan_property =
                drm_property_create_range(dev, 0, "overscan", 0, 100);

        dev->mode_config.tv_saturation_property =
                drm_property_create_range(dev, 0, "saturation", 0, 100);

        dev->mode_config.tv_hue_property =
                drm_property_create_range(dev, 0, "hue", 0, 100);

        return 0;
}
EXPORT_SYMBOL(drm_mode_create_tv_properties);

/**
 * drm_mode_create_scaling_mode_property - create scaling mode property
 * @dev: DRM device
 *
 * Called by a driver the first time it's needed, must be attached to desired
 * connectors.
 */
int drm_mode_create_scaling_mode_property(struct drm_device *dev)
{
        struct drm_property *scaling_mode;

        if (dev->mode_config.scaling_mode_property)
                return 0;

        scaling_mode =
                drm_property_create_enum(dev, 0, "scaling mode",
                                drm_scaling_mode_enum_list,
                                    ARRAY_SIZE(drm_scaling_mode_enum_list));

        dev->mode_config.scaling_mode_property = scaling_mode;

        return 0;
}
EXPORT_SYMBOL(drm_mode_create_scaling_mode_property);

/**
 * drm_mode_create_aspect_ratio_property - create aspect ratio property
 * @dev: DRM device
 *
 * Called by a driver the first time it's needed, must be attached to desired
 * connectors.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_create_aspect_ratio_property(struct drm_device *dev)
{
        if (dev->mode_config.aspect_ratio_property)
                return 0;

        dev->mode_config.aspect_ratio_property =
                drm_property_create_enum(dev, 0, "aspect ratio",
                                drm_aspect_ratio_enum_list,
                                ARRAY_SIZE(drm_aspect_ratio_enum_list));

        if (dev->mode_config.aspect_ratio_property == NULL)
                return -ENOMEM;

        return 0;
}
EXPORT_SYMBOL(drm_mode_create_aspect_ratio_property);

/**
 * drm_mode_create_dirty_property - create dirty property
 * @dev: DRM device
 *
 * Called by a driver the first time it's needed, must be attached to desired
 * connectors.
 */
int drm_mode_create_dirty_info_property(struct drm_device *dev)
{
        struct drm_property *dirty_info;

        if (dev->mode_config.dirty_info_property)
                return 0;

        dirty_info =
                drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
                                    "dirty",
                                    drm_dirty_info_enum_list,
                                    ARRAY_SIZE(drm_dirty_info_enum_list));
        dev->mode_config.dirty_info_property = dirty_info;

        return 0;
}
EXPORT_SYMBOL(drm_mode_create_dirty_info_property);

/**
 * drm_mode_create_suggested_offset_properties - create suggests offset properties
 * @dev: DRM device
 *
 * Create the the suggested x/y offset property for connectors.
 */
int drm_mode_create_suggested_offset_properties(struct drm_device *dev)
{
        if (dev->mode_config.suggested_x_property && dev->mode_config.suggested_y_property)
                return 0;

        dev->mode_config.suggested_x_property =
                drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested X", 0, 0xffffffff);

        dev->mode_config.suggested_y_property =
                drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested Y", 0, 0xffffffff);

        if (dev->mode_config.suggested_x_property == NULL ||
            dev->mode_config.suggested_y_property == NULL)
                return -ENOMEM;
        return 0;
}
EXPORT_SYMBOL(drm_mode_create_suggested_offset_properties);

static int drm_mode_group_init(struct drm_device *dev, struct drm_mode_group *group)
{
        uint32_t total_objects = 0;

        total_objects += dev->mode_config.num_crtc;
        total_objects += dev->mode_config.num_connector;
        total_objects += dev->mode_config.num_encoder;
        total_objects += dev->mode_config.num_bridge;

        group->id_list = kzalloc(total_objects * sizeof(uint32_t), GFP_KERNEL);
        if (!group->id_list)
                return -ENOMEM;

        group->num_crtcs = 0;
        group->num_connectors = 0;
        group->num_encoders = 0;
        group->num_bridges = 0;
        return 0;
}

void drm_mode_group_destroy(struct drm_mode_group *group)
{
        kfree(group->id_list);
        group->id_list = NULL;
}

/*
 * NOTE: Driver's shouldn't ever call drm_mode_group_init_legacy_group - it is
 * the drm core's responsibility to set up mode control groups.
 */
int drm_mode_group_init_legacy_group(struct drm_device *dev,
                                     struct drm_mode_group *group)
{
        struct drm_crtc *crtc;
        struct drm_encoder *encoder;
        struct drm_connector *connector;
        struct drm_bridge *bridge;
        int ret;

        if ((ret = drm_mode_group_init(dev, group)))
                return ret;

        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
                group->id_list[group->num_crtcs++] = crtc->base.id;

        list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
                group->id_list[group->num_crtcs + group->num_encoders++] =
                encoder->base.id;

        list_for_each_entry(connector, &dev->mode_config.connector_list, head)
                group->id_list[group->num_crtcs + group->num_encoders +
                               group->num_connectors++] = connector->base.id;

        list_for_each_entry(bridge, &dev->mode_config.bridge_list, head)
                group->id_list[group->num_crtcs + group->num_encoders +
                               group->num_connectors + group->num_bridges++] =
                                        bridge->base.id;

        return 0;
}
EXPORT_SYMBOL(drm_mode_group_init_legacy_group);

void drm_reinit_primary_mode_group(struct drm_device *dev)
{
        drm_modeset_lock_all(dev);
        drm_mode_group_destroy(&dev->primary->mode_group);
        drm_mode_group_init_legacy_group(dev, &dev->primary->mode_group);
        drm_modeset_unlock_all(dev);
}
EXPORT_SYMBOL(drm_reinit_primary_mode_group);

/**
 * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
 * @out: drm_mode_modeinfo struct to return to the user
 * @in: drm_display_mode to use
 *
 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
 * the user.
 */
static void drm_crtc_convert_to_umode(struct drm_mode_modeinfo *out,
                                      const struct drm_display_mode *in)
{
        WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
             in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
             in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
             in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
             in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
             "timing values too large for mode info\n");

        out->clock = in->clock;
        out->hdisplay = in->hdisplay;
        out->hsync_start = in->hsync_start;
        out->hsync_end = in->hsync_end;
        out->htotal = in->htotal;
        out->hskew = in->hskew;
        out->vdisplay = in->vdisplay;
        out->vsync_start = in->vsync_start;
        out->vsync_end = in->vsync_end;
        out->vtotal = in->vtotal;
        out->vscan = in->vscan;
        out->vrefresh = in->vrefresh;
        out->flags = in->flags;
        out->type = in->type;
        strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
        out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
}

/**
 * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
 * @out: drm_display_mode to return to the user
 * @in: drm_mode_modeinfo to use
 *
 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
 * the caller.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
static int drm_crtc_convert_umode(struct drm_display_mode *out,
                                  const struct drm_mode_modeinfo *in)
{
        if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
                return -ERANGE;

        if ((in->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
                return -EINVAL;

        out->clock = in->clock;
        out->hdisplay = in->hdisplay;
        out->hsync_start = in->hsync_start;
        out->hsync_end = in->hsync_end;
        out->htotal = in->htotal;
        out->hskew = in->hskew;
        out->vdisplay = in->vdisplay;
        out->vsync_start = in->vsync_start;
        out->vsync_end = in->vsync_end;
        out->vtotal = in->vtotal;
        out->vscan = in->vscan;
        out->vrefresh = in->vrefresh;
        out->flags = in->flags;
        out->type = in->type;
        strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
        out->name[DRM_DISPLAY_MODE_LEN-1] = 0;

        return 0;
}

/**
 * drm_mode_getresources - get graphics configuration
 * @dev: drm device for the ioctl
 * @data: data pointer for the ioctl
 * @file_priv: drm file for the ioctl call
 *
 * Construct a set of configuration description structures and return
 * them to the user, including CRTC, connector and framebuffer configuration.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_getresources(struct drm_device *dev, void *data,
                          struct drm_file *file_priv)
{
        struct drm_mode_card_res *card_res = data;
        struct list_head *lh;
        struct drm_framebuffer *fb;
        struct drm_connector *connector;
        struct drm_crtc *crtc;
        struct drm_encoder *encoder;
        int ret = 0;
        int connector_count = 0;
        int crtc_count = 0;
        int fb_count = 0;
        int encoder_count = 0;
        int copied = 0, i;
        uint32_t __user *fb_id;
        uint32_t __user *crtc_id;
        uint32_t __user *connector_id;
        uint32_t __user *encoder_id;
        struct drm_mode_group *mode_group;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;


        mutex_lock(&file_priv->fbs_lock);
        /*
         * For the non-control nodes we need to limit the list of resources
         * by IDs in the group list for this node
         */
        list_for_each(lh, &file_priv->fbs)
                fb_count++;

        /* handle this in 4 parts */
        /* FBs */
        if (card_res->count_fbs >= fb_count) {
                copied = 0;
                fb_id = (uint32_t __user *)(unsigned long)card_res->fb_id_ptr;
                list_for_each_entry(fb, &file_priv->fbs, filp_head) {
                        if (put_user(fb->base.id, fb_id + copied)) {
                                mutex_unlock(&file_priv->fbs_lock);
                                return -EFAULT;
                        }
                        copied++;
                }
        }
        card_res->count_fbs = fb_count;
        mutex_unlock(&file_priv->fbs_lock);

        /* mode_config.mutex protects the connector list against e.g. DP MST
         * connector hot-adding. CRTC/Plane lists are invariant. */
        mutex_lock(&dev->mode_config.mutex);
        if (!drm_is_primary_client(file_priv)) {

                mode_group = NULL;
                list_for_each(lh, &dev->mode_config.crtc_list)
                        crtc_count++;

                list_for_each(lh, &dev->mode_config.connector_list)
                        connector_count++;

                list_for_each(lh, &dev->mode_config.encoder_list)
                        encoder_count++;
        } else {

                mode_group = &file_priv->master->minor->mode_group;
                crtc_count = mode_group->num_crtcs;
                connector_count = mode_group->num_connectors;
                encoder_count = mode_group->num_encoders;
        }

        card_res->max_height = dev->mode_config.max_height;
        card_res->min_height = dev->mode_config.min_height;
        card_res->max_width = dev->mode_config.max_width;
        card_res->min_width = dev->mode_config.min_width;

        /* CRTCs */
        if (card_res->count_crtcs >= crtc_count) {
                copied = 0;
                crtc_id = (uint32_t __user *)(unsigned long)card_res->crtc_id_ptr;
                if (!mode_group) {
                        list_for_each_entry(crtc, &dev->mode_config.crtc_list,
                                            head) {
                                DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
                                if (put_user(crtc->base.id, crtc_id + copied)) {
                                        ret = -EFAULT;
                                        goto out;
                                }
                                copied++;
                        }
                } else {
                        for (i = 0; i < mode_group->num_crtcs; i++) {
                                if (put_user(mode_group->id_list[i],
                                             crtc_id + copied)) {
                                        ret = -EFAULT;
                                        goto out;
                                }
                                copied++;
                        }
                }
        }
        card_res->count_crtcs = crtc_count;

        /* Encoders */
        if (card_res->count_encoders >= encoder_count) {
                copied = 0;
                encoder_id = (uint32_t __user *)(unsigned long)card_res->encoder_id_ptr;
                if (!mode_group) {
                        list_for_each_entry(encoder,
                                            &dev->mode_config.encoder_list,
                                            head) {
                                DRM_DEBUG_KMS("[ENCODER:%d:%s]\n", encoder->base.id,
                                                encoder->name);
                                if (put_user(encoder->base.id, encoder_id +
                                             copied)) {
                                        ret = -EFAULT;
                                        goto out;
                                }
                                copied++;
                        }
                } else {
                        for (i = mode_group->num_crtcs; i < mode_group->num_crtcs + mode_group->num_encoders; i++) {
                                if (put_user(mode_group->id_list[i],
                                             encoder_id + copied)) {
                                        ret = -EFAULT;
                                        goto out;
                                }
                                copied++;
                        }

                }
        }
        card_res->count_encoders = encoder_count;

        /* Connectors */
        if (card_res->count_connectors >= connector_count) {
                copied = 0;
                connector_id = (uint32_t __user *)(unsigned long)card_res->connector_id_ptr;
                if (!mode_group) {
                        list_for_each_entry(connector,
                                            &dev->mode_config.connector_list,
                                            head) {
                                DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
                                        connector->base.id,
                                        connector->name);
                                if (put_user(connector->base.id,
                                             connector_id + copied)) {
                                        ret = -EFAULT;
                                        goto out;
                                }
                                copied++;
                        }
                } else {
                        int start = mode_group->num_crtcs +
                                mode_group->num_encoders;
                        for (i = start; i < start + mode_group->num_connectors; i++) {
                                if (put_user(mode_group->id_list[i],
                                             connector_id + copied)) {
                                        ret = -EFAULT;
                                        goto out;
                                }
                                copied++;
                        }
                }
        }
        card_res->count_connectors = connector_count;

        DRM_DEBUG_KMS("CRTC[%d] CONNECTORS[%d] ENCODERS[%d]\n", card_res->count_crtcs,
                  card_res->count_connectors, card_res->count_encoders);

out:
        mutex_unlock(&dev->mode_config.mutex);
        return ret;
}

/**
 * drm_mode_getcrtc - get CRTC configuration
 * @dev: drm device for the ioctl
 * @data: data pointer for the ioctl
 * @file_priv: drm file for the ioctl call
 *
 * Construct a CRTC configuration structure to return to the user.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_getcrtc(struct drm_device *dev,
                     void *data, struct drm_file *file_priv)
{
        struct drm_mode_crtc *crtc_resp = data;
        struct drm_crtc *crtc;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;

        crtc = drm_crtc_find(dev, crtc_resp->crtc_id);
        if (!crtc)
                return -ENOENT;

        drm_modeset_lock_crtc(crtc, crtc->primary);
        crtc_resp->x = crtc->x;
        crtc_resp->y = crtc->y;
        crtc_resp->gamma_size = crtc->gamma_size;
        if (crtc->primary->fb)
                crtc_resp->fb_id = crtc->primary->fb->base.id;
        else
                crtc_resp->fb_id = 0;

        if (crtc->enabled) {

                drm_crtc_convert_to_umode(&crtc_resp->mode, &crtc->mode);
                crtc_resp->mode_valid = 1;

        } else {
                crtc_resp->mode_valid = 0;
        }
        drm_modeset_unlock_crtc(crtc);

        return 0;
}

static bool drm_mode_expose_to_userspace(const struct drm_display_mode *mode,
                                         const struct drm_file *file_priv)
{
        /*
         * If user-space hasn't configured the driver to expose the stereo 3D
         * modes, don't expose them.
         */
        if (!file_priv->stereo_allowed && drm_mode_is_stereo(mode))
                return false;

        return true;
}

static struct drm_encoder *drm_connector_get_encoder(struct drm_connector *connector)
{
        /* For atomic drivers only state objects are synchronously updated and
         * protected by modeset locks, so check those first. */
        if (connector->state)
                return connector->state->best_encoder;
        return connector->encoder;
}

/**
 * drm_mode_getconnector - get connector configuration

 * @dev: drm device for the ioctl
 * @data: data pointer for the ioctl
 * @file_priv: drm file for the ioctl call
 *
 * Construct a connector configuration structure to return to the user.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_getconnector(struct drm_device *dev, void *data,
                          struct drm_file *file_priv)
{
        struct drm_mode_get_connector *out_resp = data;
        struct drm_connector *connector;
        struct drm_encoder *encoder;
        struct drm_display_mode *mode;
        int mode_count = 0;
        int props_count = 0;
        int encoders_count = 0;
        int ret = 0;
        int copied = 0;
        int i;
        struct drm_mode_modeinfo u_mode;
        struct drm_mode_modeinfo __user *mode_ptr;
        uint32_t __user *prop_ptr;
        uint64_t __user *prop_values;
        uint32_t __user *encoder_ptr;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;

        memset(&u_mode, 0, sizeof(struct drm_mode_modeinfo));

        DRM_DEBUG_KMS("[CONNECTOR:%d:?]\n", out_resp->connector_id);

        mutex_lock(&dev->mode_config.mutex);

        connector = drm_connector_find(dev, out_resp->connector_id);
        if (!connector) {
                ret = -ENOENT;
                goto out;
        }

        props_count = connector->properties.count;

        for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
                if (connector->encoder_ids[i] != 0) {
                        encoders_count++;
                }
        }

        if (out_resp->count_modes == 0) {
                connector->funcs->fill_modes(connector,
                                             dev->mode_config.max_width,
                                             dev->mode_config.max_height);
        }

        /* delayed so we get modes regardless of pre-fill_modes state */
        list_for_each_entry(mode, &connector->modes, head)
                if (drm_mode_expose_to_userspace(mode, file_priv))
                        mode_count++;

        out_resp->connector_id = connector->base.id;
        out_resp->connector_type = connector->connector_type;
        out_resp->connector_type_id = connector->connector_type_id;
        out_resp->mm_width = connector->display_info.width_mm;
        out_resp->mm_height = connector->display_info.height_mm;
        out_resp->subpixel = connector->display_info.subpixel_order;
        out_resp->connection = connector->status;
        drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);

        encoder = drm_connector_get_encoder(connector);
        if (encoder)
                out_resp->encoder_id = encoder->base.id;
        else
                out_resp->encoder_id = 0;
        drm_modeset_unlock(&dev->mode_config.connection_mutex);

        /*
         * This ioctl is called twice, once to determine how much space is
         * needed, and the 2nd time to fill it.
         */
        if ((out_resp->count_modes >= mode_count) && mode_count) {
                copied = 0;
                mode_ptr = (struct drm_mode_modeinfo __user *)(unsigned long)out_resp->modes_ptr;
                list_for_each_entry(mode, &connector->modes, head) {
                        if (!drm_mode_expose_to_userspace(mode, file_priv))
                                continue;

                        drm_crtc_convert_to_umode(&u_mode, mode);
                        if (copy_to_user(mode_ptr + copied,
                                         &u_mode, sizeof(u_mode))) {
                                ret = -EFAULT;
                                goto out;
                        }
                        copied++;
                }
        }
        out_resp->count_modes = mode_count;

        if ((out_resp->count_props >= props_count) && props_count) {
                copied = 0;
                prop_ptr = (uint32_t __user *)(unsigned long)(out_resp->props_ptr);
                prop_values = (uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr);
                for (i = 0; i < connector->properties.count; i++) {
                        if (put_user(connector->properties.ids[i],
                                     prop_ptr + copied)) {
                                ret = -EFAULT;
                                goto out;
                        }

                        if (put_user(connector->properties.values[i],
                                     prop_values + copied)) {
                                ret = -EFAULT;
                                goto out;
                        }
                        copied++;
                }
        }
        out_resp->count_props = props_count;

        if ((out_resp->count_encoders >= encoders_count) && encoders_count) {
                copied = 0;
                encoder_ptr = (uint32_t __user *)(unsigned long)(out_resp->encoders_ptr);
                for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
                        if (connector->encoder_ids[i] != 0) {
                                if (put_user(connector->encoder_ids[i],
                                             encoder_ptr + copied)) {
                                        ret = -EFAULT;
                                        goto out;
                                }
                                copied++;
                        }
                }
        }
        out_resp->count_encoders = encoders_count;

out:
        mutex_unlock(&dev->mode_config.mutex);

        return ret;
}

static struct drm_crtc *drm_encoder_get_crtc(struct drm_encoder *encoder)
{
        struct drm_connector *connector;
        struct drm_device *dev = encoder->dev;
        bool uses_atomic = false;

        /* For atomic drivers only state objects are synchronously updated and
         * protected by modeset locks, so check those first. */
        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
                if (!connector->state)
                        continue;

                uses_atomic = true;

                if (connector->state->best_encoder != encoder)
                        continue;

                return connector->state->crtc;
        }

        /* Don't return stale data (e.g. pending async disable). */
        if (uses_atomic)
                return NULL;

        return encoder->crtc;
}

/**
 * drm_mode_getencoder - get encoder configuration
 * @dev: drm device for the ioctl
 * @data: data pointer for the ioctl
 * @file_priv: drm file for the ioctl call
 *
 * Construct a encoder configuration structure to return to the user.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_getencoder(struct drm_device *dev, void *data,
                        struct drm_file *file_priv)
{
        struct drm_mode_get_encoder *enc_resp = data;
        struct drm_encoder *encoder;
        struct drm_crtc *crtc;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;

        encoder = drm_encoder_find(dev, enc_resp->encoder_id);
        if (!encoder)
                return -ENOENT;

        drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
        crtc = drm_encoder_get_crtc(encoder);
        if (crtc)
                enc_resp->crtc_id = crtc->base.id;
        else if (encoder->crtc)
                enc_resp->crtc_id = encoder->crtc->base.id;
        else
                enc_resp->crtc_id = 0;
        drm_modeset_unlock(&dev->mode_config.connection_mutex);

        enc_resp->encoder_type = encoder->encoder_type;
        enc_resp->encoder_id = encoder->base.id;
        enc_resp->possible_crtcs = encoder->possible_crtcs;
        enc_resp->possible_clones = encoder->possible_clones;

        return 0;
}

/**
 * drm_mode_getplane_res - enumerate all plane resources
 * @dev: DRM device
 * @data: ioctl data
 * @file_priv: DRM file info
 *
 * Construct a list of plane ids to return to the user.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_getplane_res(struct drm_device *dev, void *data,
                          struct drm_file *file_priv)
{
        struct drm_mode_get_plane_res *plane_resp = data;
        struct drm_mode_config *config;
        struct drm_plane *plane;
        uint32_t __user *plane_ptr;
        int copied = 0;
        unsigned num_planes;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;

        config = &dev->mode_config;

        if (file_priv->universal_planes)
                num_planes = config->num_total_plane;
        else
                num_planes = config->num_overlay_plane;

        /*
         * This ioctl is called twice, once to determine how much space is
         * needed, and the 2nd time to fill it.
         */
        if (num_planes &&
            (plane_resp->count_planes >= num_planes)) {
                plane_ptr = (uint32_t __user *)(unsigned long)plane_resp->plane_id_ptr;

                /* Plane lists are invariant, no locking needed. */
                list_for_each_entry(plane, &config->plane_list, head) {
                        /*
                         * Unless userspace set the 'universal planes'
                         * capability bit, only advertise overlays.
                         */
                        if (plane->type != DRM_PLANE_TYPE_OVERLAY &&
                            !file_priv->universal_planes)
                                continue;

                        if (put_user(plane->base.id, plane_ptr + copied))
                                return -EFAULT;
                        copied++;
                }
        }
        plane_resp->count_planes = num_planes;

        return 0;
}

/**
 * drm_mode_getplane - get plane configuration
 * @dev: DRM device
 * @data: ioctl data
 * @file_priv: DRM file info
 *
 * Construct a plane configuration structure to return to the user.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_getplane(struct drm_device *dev, void *data,
                      struct drm_file *file_priv)
{
        struct drm_mode_get_plane *plane_resp = data;
        struct drm_plane *plane;
        uint32_t __user *format_ptr;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;

        plane = drm_plane_find(dev, plane_resp->plane_id);
        if (!plane)
                return -ENOENT;

        drm_modeset_lock(&plane->mutex, NULL);
        if (plane->crtc)
                plane_resp->crtc_id = plane->crtc->base.id;
        else
                plane_resp->crtc_id = 0;

        if (plane->fb)
                plane_resp->fb_id = plane->fb->base.id;
        else
                plane_resp->fb_id = 0;
        drm_modeset_unlock(&plane->mutex);

        plane_resp->plane_id = plane->base.id;
        plane_resp->possible_crtcs = plane->possible_crtcs;
        plane_resp->gamma_size = 0;

        /*
         * This ioctl is called twice, once to determine how much space is
         * needed, and the 2nd time to fill it.
         */
        if (plane->format_count &&
            (plane_resp->count_format_types >= plane->format_count)) {
                format_ptr = (uint32_t __user *)(unsigned long)plane_resp->format_type_ptr;
                if (copy_to_user(format_ptr,
                                 plane->format_types,
                                 sizeof(uint32_t) * plane->format_count)) {
                        return -EFAULT;
                }
        }
        plane_resp->count_format_types = plane->format_count;

        return 0;
}

/*
 * setplane_internal - setplane handler for internal callers
 *
 * Note that we assume an extra reference has already been taken on fb.  If the
 * update fails, this reference will be dropped before return; if it succeeds,
 * the previous framebuffer (if any) will be unreferenced instead.
 *
 * src_{x,y,w,h} are provided in 16.16 fixed point format
 */
static int __setplane_internal(struct drm_plane *plane,
                               struct drm_crtc *crtc,
                               struct drm_framebuffer *fb,
                               int32_t crtc_x, int32_t crtc_y,
                               uint32_t crtc_w, uint32_t crtc_h,
                               /* src_{x,y,w,h} values are 16.16 fixed point */
                               uint32_t src_x, uint32_t src_y,
                               uint32_t src_w, uint32_t src_h)
{
        int ret = 0;
        unsigned int fb_width, fb_height;
        unsigned int i;

        /* No fb means shut it down */
        if (!fb) {
                plane->old_fb = plane->fb;
                ret = plane->funcs->disable_plane(plane);
                if (!ret) {
                        plane->crtc = NULL;
                        plane->fb = NULL;
                } else {
                        plane->old_fb = NULL;
                }
                goto out;
        }

        /* Check whether this plane is usable on this CRTC */
        if (!(plane->possible_crtcs & drm_crtc_mask(crtc))) {
                DRM_DEBUG_KMS("Invalid crtc for plane\n");
                ret = -EINVAL;
                goto out;
        }

        /* Check whether this plane supports the fb pixel format. */
        for (i = 0; i < plane->format_count; i++)
                if (fb->pixel_format == plane->format_types[i])
                        break;
        if (i == plane->format_count) {
                DRM_DEBUG_KMS("Invalid pixel format %s\n",
                              drm_get_format_name(fb->pixel_format));
                ret = -EINVAL;
                goto out;
        }

        fb_width = fb->width << 16;
        fb_height = fb->height << 16;

        /* Make sure source coordinates are inside the fb. */
        if (src_w > fb_width ||
            src_x > fb_width - src_w ||
            src_h > fb_height ||
            src_y > fb_height - src_h) {
                DRM_DEBUG_KMS("Invalid source coordinates "
                              "%u.%06ux%u.%06u+%u.%06u+%u.%06u\n",
                              src_w >> 16, ((src_w & 0xffff) * 15625) >> 10,
                              src_h >> 16, ((src_h & 0xffff) * 15625) >> 10,
                              src_x >> 16, ((src_x & 0xffff) * 15625) >> 10,
                              src_y >> 16, ((src_y & 0xffff) * 15625) >> 10);
                ret = -ENOSPC;
                goto out;
        }

        plane->old_fb = plane->fb;
        ret = plane->funcs->update_plane(plane, crtc, fb,
                                         crtc_x, crtc_y, crtc_w, crtc_h,
                                         src_x, src_y, src_w, src_h);
        if (!ret) {
                plane->crtc = crtc;
                plane->fb = fb;
                fb = NULL;
        } else {
                plane->old_fb = NULL;
        }

out:
        if (fb)
                drm_framebuffer_unreference(fb);
        if (plane->old_fb)
                drm_framebuffer_unreference(plane->old_fb);
        plane->old_fb = NULL;

        return ret;
}

static int setplane_internal(struct drm_plane *plane,
                             struct drm_crtc *crtc,
                             struct drm_framebuffer *fb,
                             int32_t crtc_x, int32_t crtc_y,
                             uint32_t crtc_w, uint32_t crtc_h,
                             /* src_{x,y,w,h} values are 16.16 fixed point */
                             uint32_t src_x, uint32_t src_y,
                             uint32_t src_w, uint32_t src_h)
{
        int ret;

        drm_modeset_lock_all(plane->dev);
        ret = __setplane_internal(plane, crtc, fb,
                                  crtc_x, crtc_y, crtc_w, crtc_h,
                                  src_x, src_y, src_w, src_h);
        drm_modeset_unlock_all(plane->dev);

        return ret;
}

/**
 * drm_mode_setplane - configure a plane's configuration
 * @dev: DRM device
 * @data: ioctl data*
 * @file_priv: DRM file info
 *
 * Set plane configuration, including placement, fb, scaling, and other factors.
 * Or pass a NULL fb to disable (planes may be disabled without providing a
 * valid crtc).
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_setplane(struct drm_device *dev, void *data,
                      struct drm_file *file_priv)
{
        struct drm_mode_set_plane *plane_req = data;
        struct drm_plane *plane;
        struct drm_crtc *crtc = NULL;
        struct drm_framebuffer *fb = NULL;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;

        /* Give drivers some help against integer overflows */
        if (plane_req->crtc_w > INT_MAX ||
            plane_req->crtc_x > INT_MAX - (int32_t) plane_req->crtc_w ||
            plane_req->crtc_h > INT_MAX ||
            plane_req->crtc_y > INT_MAX - (int32_t) plane_req->crtc_h) {
                DRM_DEBUG_KMS("Invalid CRTC coordinates %ux%u+%d+%d\n",
                              plane_req->crtc_w, plane_req->crtc_h,
                              plane_req->crtc_x, plane_req->crtc_y);
                return -ERANGE;
        }

        /*
         * First, find the plane, crtc, and fb objects.  If not available,
         * we don't bother to call the driver.
         */
        plane = drm_plane_find(dev, plane_req->plane_id);
        if (!plane) {
                DRM_DEBUG_KMS("Unknown plane ID %d\n",
                              plane_req->plane_id);
                return -ENOENT;
        }

        if (plane_req->fb_id) {
                fb = drm_framebuffer_lookup(dev, plane_req->fb_id);
                if (!fb) {
                        DRM_DEBUG_KMS("Unknown framebuffer ID %d\n",
                                      plane_req->fb_id);
                        return -ENOENT;
                }

                crtc = drm_crtc_find(dev, plane_req->crtc_id);
                if (!crtc) {
                        DRM_DEBUG_KMS("Unknown crtc ID %d\n",
                                      plane_req->crtc_id);
                        return -ENOENT;
                }
        }

        /*
         * setplane_internal will take care of deref'ing either the old or new
         * framebuffer depending on success.
         */
        return setplane_internal(plane, crtc, fb,
                                 plane_req->crtc_x, plane_req->crtc_y,
                                 plane_req->crtc_w, plane_req->crtc_h,
                                 plane_req->src_x, plane_req->src_y,
                                 plane_req->src_w, plane_req->src_h);
}

/**
 * drm_mode_set_config_internal - helper to call ->set_config
 * @set: modeset config to set
 *
 * This is a little helper to wrap internal calls to the ->set_config driver
 * interface. The only thing it adds is correct refcounting dance.
 * 
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_set_config_internal(struct drm_mode_set *set)
{
        struct drm_crtc *crtc = set->crtc;
        struct drm_framebuffer *fb;
        struct drm_crtc *tmp;
        int ret;

        /*
         * NOTE: ->set_config can also disable other crtcs (if we steal all
         * connectors from it), hence we need to refcount the fbs across all
         * crtcs. Atomic modeset will have saner semantics ...
         */
        list_for_each_entry(tmp, &crtc->dev->mode_config.crtc_list, head)
                tmp->primary->old_fb = tmp->primary->fb;

        fb = set->fb;

        ret = crtc->funcs->set_config(set);
        if (ret == 0) {
                crtc->primary->crtc = crtc;
                crtc->primary->fb = fb;
        }

        list_for_each_entry(tmp, &crtc->dev->mode_config.crtc_list, head) {
                if (tmp->primary->fb)
                        drm_framebuffer_reference(tmp->primary->fb);
                if (tmp->primary->old_fb)
                        drm_framebuffer_unreference(tmp->primary->old_fb);
                tmp->primary->old_fb = NULL;
        }

        return ret;
}
EXPORT_SYMBOL(drm_mode_set_config_internal);

/**
 * drm_crtc_check_viewport - Checks that a framebuffer is big enough for the
 *     CRTC viewport
 * @crtc: CRTC that framebuffer will be displayed on
 * @x: x panning
 * @y: y panning
 * @mode: mode that framebuffer will be displayed under
 * @fb: framebuffer to check size of
 */
int drm_crtc_check_viewport(const struct drm_crtc *crtc,
                            int x, int y,
                            const struct drm_display_mode *mode,
                            const struct drm_framebuffer *fb)

{
        int hdisplay, vdisplay;

        hdisplay = mode->hdisplay;
        vdisplay = mode->vdisplay;

        if (drm_mode_is_stereo(mode)) {
                struct drm_display_mode adjusted = *mode;

                drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE);
                hdisplay = adjusted.crtc_hdisplay;
                vdisplay = adjusted.crtc_vdisplay;
        }

        if (crtc->invert_dimensions)
                swap(hdisplay, vdisplay);

        if (hdisplay > fb->width ||
            vdisplay > fb->height ||
            x > fb->width - hdisplay ||
            y > fb->height - vdisplay) {
                DRM_DEBUG_KMS("Invalid fb size %ux%u for CRTC viewport %ux%u+%d+%d%s.\n",
                              fb->width, fb->height, hdisplay, vdisplay, x, y,
                              crtc->invert_dimensions ? " (inverted)" : "");
                return -ENOSPC;
        }

        return 0;
}
EXPORT_SYMBOL(drm_crtc_check_viewport);

/**
 * drm_mode_setcrtc - set CRTC configuration
 * @dev: drm device for the ioctl
 * @data: data pointer for the ioctl
 * @file_priv: drm file for the ioctl call
 *
 * Build a new CRTC configuration based on user request.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_setcrtc(struct drm_device *dev, void *data,
                     struct drm_file *file_priv)
{
        struct drm_mode_config *config = &dev->mode_config;
        struct drm_mode_crtc *crtc_req = data;
        struct drm_crtc *crtc;
        struct drm_connector **connector_set = NULL, *connector;
        struct drm_framebuffer *fb = NULL;
        struct drm_display_mode *mode = NULL;
        struct drm_mode_set set;
        uint32_t __user *set_connectors_ptr;
        int ret;
        int i;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;

        /* For some reason crtc x/y offsets are signed internally. */
        if (crtc_req->x > INT_MAX || crtc_req->y > INT_MAX)
                return -ERANGE;

        drm_modeset_lock_all(dev);
        crtc = drm_crtc_find(dev, crtc_req->crtc_id);
        if (!crtc) {
                DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_req->crtc_id);
                ret = -ENOENT;
                goto out;
        }
        DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);

        if (crtc_req->mode_valid) {
                /* If we have a mode we need a framebuffer. */
                /* If we pass -1, set the mode with the currently bound fb */
                if (crtc_req->fb_id == -1) {
                        if (!crtc->primary->fb) {
                                DRM_DEBUG_KMS("CRTC doesn't have current FB\n");
                                ret = -EINVAL;
                                goto out;
                        }
                        fb = crtc->primary->fb;
                        /* Make refcounting symmetric with the lookup path. */
                        drm_framebuffer_reference(fb);
                } else {
                        fb = drm_framebuffer_lookup(dev, crtc_req->fb_id);
                        if (!fb) {
                                DRM_DEBUG_KMS("Unknown FB ID%d\n",
                                                crtc_req->fb_id);
                                ret = -ENOENT;
                                goto out;
                        }
                }

                mode = drm_mode_create(dev);
                if (!mode) {
                        ret = -ENOMEM;
                        goto out;
                }

                ret = drm_crtc_convert_umode(mode, &crtc_req->mode);
                if (ret) {
                        DRM_DEBUG_KMS("Invalid mode\n");
                        goto out;
                }

                drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);

                ret = drm_crtc_check_viewport(crtc, crtc_req->x, crtc_req->y,
                                              mode, fb);
                if (ret)
                        goto out;

        }

        if (crtc_req->count_connectors == 0 && mode) {
                DRM_DEBUG_KMS("Count connectors is 0 but mode set\n");
                ret = -EINVAL;
                goto out;
        }

        if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
                DRM_DEBUG_KMS("Count connectors is %d but no mode or fb set\n",
                          crtc_req->count_connectors);
                ret = -EINVAL;
                goto out;
        }

        if (crtc_req->count_connectors > 0) {
                u32 out_id;

                /* Avoid unbounded kernel memory allocation */
                if (crtc_req->count_connectors > config->num_connector) {
                        ret = -EINVAL;
                        goto out;
                }

                connector_set = kmalloc(crtc_req->count_connectors *
                                        sizeof(struct drm_connector *),
                                        GFP_KERNEL);
                if (!connector_set) {
                        ret = -ENOMEM;
                        goto out;
                }

                for (i = 0; i < crtc_req->count_connectors; i++) {
                        set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;
                        if (get_user(out_id, &set_connectors_ptr[i])) {
                                ret = -EFAULT;
                                goto out;
                        }

                        connector = drm_connector_find(dev, out_id);
                        if (!connector) {
                                DRM_DEBUG_KMS("Connector id %d unknown\n",
                                                out_id);
                                ret = -ENOENT;
                                goto out;
                        }
                        DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
                                        connector->base.id,
                                        connector->name);

                        connector_set[i] = connector;
                }
        }

        set.crtc = crtc;
        set.x = crtc_req->x;
        set.y = crtc_req->y;
        set.mode = mode;
        set.connectors = connector_set;
        set.num_connectors = crtc_req->count_connectors;
        set.fb = fb;
        ret = drm_mode_set_config_internal(&set);

out:
        if (fb)
                drm_framebuffer_unreference(fb);

        kfree(connector_set);
        drm_mode_destroy(dev, mode);
        drm_modeset_unlock_all(dev);
        return ret;
}

/**
 * drm_mode_cursor_universal - translate legacy cursor ioctl call into a
 *     universal plane handler call
 * @crtc: crtc to update cursor for
 * @req: data pointer for the ioctl
 * @file_priv: drm file for the ioctl call
 *
 * Legacy cursor ioctl's work directly with driver buffer handles.  To
 * translate legacy ioctl calls into universal plane handler calls, we need to
 * wrap the native buffer handle in a drm_framebuffer.
 *
 * Note that we assume any handle passed to the legacy ioctls was a 32-bit ARGB
 * buffer with a pitch of 4*width; the universal plane interface should be used
 * directly in cases where the hardware can support other buffer settings and
 * userspace wants to make use of these capabilities.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
static int drm_mode_cursor_universal(struct drm_crtc *crtc,
                                     struct drm_mode_cursor2 *req,
                                     struct drm_file *file_priv)
{
        struct drm_device *dev = crtc->dev;
        struct drm_framebuffer *fb = NULL;
        struct drm_mode_fb_cmd2 fbreq = {
                .width = req->width,
                .height = req->height,
                .pixel_format = DRM_FORMAT_ARGB8888,
                .pitches = { req->width * 4 },
                .handles = { req->handle },
        };
        int32_t crtc_x, crtc_y;
        uint32_t crtc_w = 0, crtc_h = 0;
        uint32_t src_w = 0, src_h = 0;
        int ret = 0;

        BUG_ON(!crtc->cursor);
        WARN_ON(crtc->cursor->crtc != crtc && crtc->cursor->crtc != NULL);

        /*
         * Obtain fb we'll be using (either new or existing) and take an extra
         * reference to it if fb != null.  setplane will take care of dropping
         * the reference if the plane update fails.
         */
        if (req->flags & DRM_MODE_CURSOR_BO) {
                if (req->handle) {
                        fb = add_framebuffer_internal(dev, &fbreq, file_priv);
                        if (IS_ERR(fb)) {
                                DRM_DEBUG_KMS("failed to wrap cursor buffer in drm framebuffer\n");
                                return PTR_ERR(fb);
                        }

                        drm_framebuffer_reference(fb);
                } else {
                        fb = NULL;
                }
        } else {
                fb = crtc->cursor->fb;
                if (fb)
                        drm_framebuffer_reference(fb);
        }

        if (req->flags & DRM_MODE_CURSOR_MOVE) {
                crtc_x = req->x;
                crtc_y = req->y;
        } else {
                crtc_x = crtc->cursor_x;
                crtc_y = crtc->cursor_y;
        }

        if (fb) {
                crtc_w = fb->width;
                crtc_h = fb->height;
                src_w = fb->width << 16;
                src_h = fb->height << 16;
        }

        /*
         * setplane_internal will take care of deref'ing either the old or new
         * framebuffer depending on success.
         */
        ret = __setplane_internal(crtc->cursor, crtc, fb,
                                crtc_x, crtc_y, crtc_w, crtc_h,
                                0, 0, src_w, src_h);

        /* Update successful; save new cursor position, if necessary */
        if (ret == 0 && req->flags & DRM_MODE_CURSOR_MOVE) {
                crtc->cursor_x = req->x;
                crtc->cursor_y = req->y;
        }

        return ret;
}

static int drm_mode_cursor_common(struct drm_device *dev,
                                  struct drm_mode_cursor2 *req,
                                  struct drm_file *file_priv)
{
        struct drm_crtc *crtc;
        int ret = 0;

        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;

        if (!req->flags || (~DRM_MODE_CURSOR_FLAGS & req->flags))
                return -EINVAL;

        crtc = drm_crtc_find(dev, req->crtc_id);
        if (!crtc) {
                DRM_DEBUG_KMS("Unknown CRTC ID %d\n", req->crtc_id);
                return -ENOENT;
        }

        /*
         * If this crtc has a universal cursor plane, call that plane's update
         * handler rather than using legacy cursor handlers.
         */
        drm_modeset_lock_crtc(crtc, crtc->cursor);
        if (crtc->cursor) {
                ret = drm_mode_cursor_universal(crtc, req, file_priv);
                goto out;
        }

        if (req->flags & DRM_MODE_CURSOR_BO) {
                if (!crtc->funcs->cursor_set && !crtc->funcs->cursor_set2) {
                        ret = -ENXIO;
                        goto out;
                }
                /* Turns off the cursor if handle is 0 */
                if (crtc->funcs->cursor_set2)
                        ret = crtc->funcs->cursor_set2(crtc, file_priv, req->handle,
                                                      req->width, req->height, req->hot_x, req->hot_y);
                else
                        ret = crtc->funcs->cursor_set(crtc, file_priv, req->handle,
                                                      req->width, req->height);
        }

        if (req->flags & DRM_MODE_CURSOR_MOVE) {
                if (crtc->funcs->cursor_move) {
                        ret = crtc->funcs->cursor_move(crtc, req->x, req->y);
                } else {
                        ret = -EFAULT;
                        goto out;
                }
        }
out:
        drm_modeset_unlock_crtc(crtc);

        return ret;

}


/**
 * drm_mode_cursor_ioctl - set CRTC's cursor configuration
 * @dev: drm device for the ioctl
 * @data: data pointer for the ioctl
 * @file_priv: drm file for the ioctl call
 *
 * Set the cursor configuration based on user request.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_cursor_ioctl(struct drm_device *dev,
                          void *data, struct drm_file *file_priv)
{
        struct drm_mode_cursor *req = data;
        struct drm_mode_cursor2 new_req;

        memcpy(&new_req, req, sizeof(struct drm_mode_cursor));
        new_req.hot_x = new_req.hot_y = 0;

        return drm_mode_cursor_common(dev, &new_req, file_priv);
}

/**
 * drm_mode_cursor2_ioctl - set CRTC's cursor configuration
 * @dev: drm device for the ioctl
 * @data: data pointer for the ioctl
 * @file_priv: drm file for the ioctl call
 *
 * Set the cursor configuration based on user request. This implements the 2nd
 * version of the cursor ioctl, which allows userspace to additionally specify
 * the hotspot of the pointer.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int drm_mode_cursor2_ioctl(struct drm_device *dev,
                           void *data, struct drm_file *file_priv)
{
        struct drm_mode_cursor2 *req = data;
        return drm_mode_cursor_common(dev, req, file_priv);
}

/**
 * drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
 * @bpp: bits per pixels
 * @depth: bit depth per pixel
 *
 * Computes a drm fourcc pixel format code for the given @bpp/@depth values.
 * Useful in fbdev emulation code, since that deals in those values.
 */
uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth)
{
        uint32_t fmt;

        switch (bpp) {
        case 8:
                fmt = DRM_FORMAT_C8;
                break;
        case 16:
                if (depth == 15)
                        fmt = DRM_FORMAT_XRGB1555;
                else
                        fmt = DRM_FORMAT_RGB565;
                break;
        case 24:
                fmt = DRM_FORMAT_RGB888;
                break;
        case 32:
                if (depth == 24)