omap_drv.c

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/*
 * drivers/staging/omapdrm/omap_drv.c
 *
 * Copyright (C) 2011 Texas Instruments
 * Author: Rob Clark <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "omap_drv.h"

#include "drm_crtc_helper.h"
#include "drm_fb_helper.h"
#include "omap_dmm_tiler.h"

#define DRIVER_NAME     MODULE_NAME
#define DRIVER_DESC     "OMAP DRM"
#define DRIVER_DATE     "20110917"
#define DRIVER_MAJOR        1
#define DRIVER_MINOR        0
#define DRIVER_PATCHLEVEL   0

struct drm_device *drm_device;

static int num_crtc = CONFIG_DRM_OMAP_NUM_CRTCS;

MODULE_PARM_DESC(num_crtc, "Number of overlays to use as CRTCs");
module_param(num_crtc, int, 0600);

/*
 * mode config funcs
 */

/* Notes about mapping DSS and DRM entities:
 *    CRTC:        overlay
 *    encoder:     manager.. with some extension to allow one primary CRTC
 *                 and zero or more video CRTC's to be mapped to one encoder?
 *    connector:   dssdev.. manager can be attached/detached from different
 *                 devices
 */

static void omap_fb_output_poll_changed(struct drm_device *dev)
{
    struct omap_drm_private *priv = dev->dev_private;
    DBG("dev=%p", dev);
    if (priv->fbdev) {
        drm_fb_helper_hotplug_event(priv->fbdev);
    }
}

static const struct drm_mode_config_funcs omap_mode_config_funcs = {
    .fb_create = omap_framebuffer_create,
    .output_poll_changed = omap_fb_output_poll_changed,
};

static int get_connector_type(struct omap_dss_device *dssdev)
{
    switch (dssdev->type) {
    case OMAP_DISPLAY_TYPE_HDMI:
        return DRM_MODE_CONNECTOR_HDMIA;
    case OMAP_DISPLAY_TYPE_DPI:
        if (!strcmp(dssdev->name, "dvi"))
            return DRM_MODE_CONNECTOR_DVID;
        /* fallthrough */
    default:
        return DRM_MODE_CONNECTOR_Unknown;
    }
}

#if 0 /* enable when dss2 supports hotplug */
static int omap_drm_notifier(struct notifier_block *nb,
        unsigned long evt, void *arg)
{
    switch (evt) {
    case OMAP_DSS_SIZE_CHANGE:
    case OMAP_DSS_HOTPLUG_CONNECT:
    case OMAP_DSS_HOTPLUG_DISCONNECT: {
        struct drm_device *dev = drm_device;
        DBG("hotplug event: evt=%d, dev=%p", evt, dev);
        if (dev) {
            drm_sysfs_hotplug_event(dev);
        }
        return NOTIFY_OK;
    }
    default:  /* don't care about other events for now */
        return NOTIFY_DONE;
    }
}
#endif

static void dump_video_chains(void)
{
    int i;

    DBG("dumping video chains: ");
    for (i = 0; i < omap_dss_get_num_overlays(); i++) {
        struct omap_overlay *ovl = omap_dss_get_overlay(i);
        struct omap_overlay_manager *mgr = ovl->manager;
        struct omap_dss_device *dssdev = mgr ?
                    mgr->get_device(mgr) : NULL;
        if (dssdev) {
            DBG("%d: %s -> %s -> %s", i, ovl->name, mgr->name,
                        dssdev->name);
        } else if (mgr) {
            DBG("%d: %s -> %s", i, ovl->name, mgr->name);
        } else {
            DBG("%d: %s", i, ovl->name);
        }
    }
}

/* create encoders for each manager */
static int create_encoder(struct drm_device *dev,
        struct omap_overlay_manager *mgr)
{
    struct omap_drm_private *priv = dev->dev_private;
    struct drm_encoder *encoder = omap_encoder_init(dev, mgr);

    if (!encoder) {
        dev_err(dev->dev, "could not create encoder: %s\n",
                mgr->name);
        return -ENOMEM;
    }

    BUG_ON(priv->num_encoders >= ARRAY_SIZE(priv->encoders));

    priv->encoders[priv->num_encoders++] = encoder;

    return 0;
}

/* create connectors for each display device */
static int create_connector(struct drm_device *dev,
        struct omap_dss_device *dssdev)
{
    struct omap_drm_private *priv = dev->dev_private;
    static struct notifier_block *notifier;
    struct drm_connector *connector;
    int j;

    if (!dssdev->driver) {
        dev_warn(dev->dev, "%s has no driver.. skipping it\n",
                dssdev->name);
        return 0;
    }

    if (!(dssdev->driver->get_timings ||
                dssdev->driver->read_edid)) {
        dev_warn(dev->dev, "%s driver does not support "
            "get_timings or read_edid.. skipping it!\n",
            dssdev->name);
        return 0;
    }

    connector = omap_connector_init(dev,
            get_connector_type(dssdev), dssdev);

    if (!connector) {
        dev_err(dev->dev, "could not create connector: %s\n",
                dssdev->name);
        return -ENOMEM;
    }

    BUG_ON(priv->num_connectors >= ARRAY_SIZE(priv->connectors));

    priv->connectors[priv->num_connectors++] = connector;

#if 0 /* enable when dss2 supports hotplug */
    notifier = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
    notifier->notifier_call = omap_drm_notifier;
    omap_dss_add_notify(dssdev, notifier);
#else
    notifier = NULL;
#endif

    for (j = 0; j < priv->num_encoders; j++) {
        struct omap_overlay_manager *mgr =
            omap_encoder_get_manager(priv->encoders[j]);
        if (mgr->get_device(mgr) == dssdev) {
            drm_mode_connector_attach_encoder(connector,
                    priv->encoders[j]);
        }
    }

    return 0;
}

/* create up to max_overlays CRTCs mapping to overlays.. by default,
 * connect the overlays to different managers/encoders, giving priority
 * to encoders connected to connectors with a detected connection
 */
static int create_crtc(struct drm_device *dev, struct omap_overlay *ovl,
        int *j, unsigned int connected_connectors)
{
    struct omap_drm_private *priv = dev->dev_private;
    struct omap_overlay_manager *mgr = NULL;
    struct drm_crtc *crtc;

    /* find next best connector, ones with detected connection first
     */
    while (*j < priv->num_connectors && !mgr) {
        if (connected_connectors & (1 << *j)) {
            struct drm_encoder *encoder =
                omap_connector_attached_encoder(
                        priv->connectors[*j]);
            if (encoder) {
                mgr = omap_encoder_get_manager(encoder);
            }
        }
        (*j)++;
    }

    /* if we couldn't find another connected connector, lets start
     * looking at the unconnected connectors:
     *
     * note: it might not be immediately apparent, but thanks to
     * the !mgr check in both this loop and the one above, the only
     * way to enter this loop is with *j == priv->num_connectors,
     * so idx can never go negative.
     */
    while (*j < 2 * priv->num_connectors && !mgr) {
        int idx = *j - priv->num_connectors;
        if (!(connected_connectors & (1 << idx))) {
            struct drm_encoder *encoder =
                omap_connector_attached_encoder(
                        priv->connectors[idx]);
            if (encoder) {
                mgr = omap_encoder_get_manager(encoder);
            }
        }
        (*j)++;
    }

    crtc = omap_crtc_init(dev, ovl, priv->num_crtcs);

    if (!crtc) {
        dev_err(dev->dev, "could not create CRTC: %s\n",
                ovl->name);
        return -ENOMEM;
    }

    BUG_ON(priv->num_crtcs >= ARRAY_SIZE(priv->crtcs));

    priv->crtcs[priv->num_crtcs++] = crtc;

    return 0;
}

static int create_plane(struct drm_device *dev, struct omap_overlay *ovl,
        unsigned int possible_crtcs)
{
    struct omap_drm_private *priv = dev->dev_private;
    struct drm_plane *plane =
            omap_plane_init(dev, ovl, possible_crtcs, false);

    if (!plane) {
        dev_err(dev->dev, "could not create plane: %s\n",
                ovl->name);
        return -ENOMEM;
    }

    BUG_ON(priv->num_planes >= ARRAY_SIZE(priv->planes));

    priv->planes[priv->num_planes++] = plane;

    return 0;
}

static int match_dev_name(struct omap_dss_device *dssdev, void *data)
{
    return !strcmp(dssdev->name, data);
}

static unsigned int detect_connectors(struct drm_device *dev)
{
    struct omap_drm_private *priv = dev->dev_private;
    unsigned int connected_connectors = 0;
    int i;

    for (i = 0; i < priv->num_connectors; i++) {
        struct drm_connector *connector = priv->connectors[i];
        if (omap_connector_detect(connector, true) ==
                connector_status_connected) {
            connected_connectors |= (1 << i);
        }
    }

    return connected_connectors;
}

static int omap_modeset_init(struct drm_device *dev)
{
    const struct omap_drm_platform_data *pdata = dev->dev->platform_data;
    struct omap_kms_platform_data *kms_pdata = NULL;
    struct omap_drm_private *priv = dev->dev_private;
    struct omap_dss_device *dssdev = NULL;
    int i, j;
    unsigned int connected_connectors = 0;

    drm_mode_config_init(dev);

    if (pdata && pdata->kms_pdata) {
        kms_pdata = pdata->kms_pdata;

        /* if platform data is provided by the board file, use it to
         * control which overlays, managers, and devices we own.
         */
        for (i = 0; i < kms_pdata->mgr_cnt; i++) {
            struct omap_overlay_manager *mgr =
                omap_dss_get_overlay_manager(
                        kms_pdata->mgr_ids[i]);
            create_encoder(dev, mgr);
        }

        for (i = 0; i < kms_pdata->dev_cnt; i++) {
            struct omap_dss_device *dssdev =
                omap_dss_find_device(
                    (void *)kms_pdata->dev_names[i],
                    match_dev_name);
            if (!dssdev) {
                dev_warn(dev->dev, "no such dssdev: %s\n",
                        kms_pdata->dev_names[i]);
                continue;
            }
            create_connector(dev, dssdev);
        }

        connected_connectors = detect_connectors(dev);

        j = 0;
        for (i = 0; i < kms_pdata->ovl_cnt; i++) {
            struct omap_overlay *ovl =
                omap_dss_get_overlay(kms_pdata->ovl_ids[i]);
            create_crtc(dev, ovl, &j, connected_connectors);
        }

        for (i = 0; i < kms_pdata->pln_cnt; i++) {
            struct omap_overlay *ovl =
                omap_dss_get_overlay(kms_pdata->pln_ids[i]);
            create_plane(dev, ovl, (1 << priv->num_crtcs) - 1);
        }
    } else {
        /* otherwise just grab up to CONFIG_DRM_OMAP_NUM_CRTCS and try
         * to make educated guesses about everything else
         */
        int max_overlays = min(omap_dss_get_num_overlays(), num_crtc);

        for (i = 0; i < omap_dss_get_num_overlay_managers(); i++) {
            create_encoder(dev, omap_dss_get_overlay_manager(i));
        }

        for_each_dss_dev(dssdev) {
            create_connector(dev, dssdev);
        }

        connected_connectors = detect_connectors(dev);

        j = 0;
        for (i = 0; i < max_overlays; i++) {
            create_crtc(dev, omap_dss_get_overlay(i),
                    &j, connected_connectors);
        }

        /* use any remaining overlays as drm planes */
        for (; i < omap_dss_get_num_overlays(); i++) {
            struct omap_overlay *ovl = omap_dss_get_overlay(i);
            create_plane(dev, ovl, (1 << priv->num_crtcs) - 1);
        }
    }

    /* for now keep the mapping of CRTCs and encoders static.. */
    for (i = 0; i < priv->num_encoders; i++) {
        struct drm_encoder *encoder = priv->encoders[i];
        struct omap_overlay_manager *mgr =
                omap_encoder_get_manager(encoder);

        encoder->possible_crtcs = (1 << priv->num_crtcs) - 1;

        DBG("%s: possible_crtcs=%08x", mgr->name,
                    encoder->possible_crtcs);
    }

    dump_video_chains();

    dev->mode_config.min_width = 32;
    dev->mode_config.min_height = 32;

    /* note: eventually will need some cpu_is_omapXYZ() type stuff here
     * to fill in these limits properly on different OMAP generations..
     */
    dev->mode_config.max_width = 2048;
    dev->mode_config.max_height = 2048;

    dev->mode_config.funcs = &omap_mode_config_funcs;

    return 0;
}

static void omap_modeset_free(struct drm_device *dev)
{
    drm_mode_config_cleanup(dev);
}

/*
 * drm ioctl funcs
 */


static int ioctl_get_param(struct drm_device *dev, void *data,
        struct drm_file *file_priv)
{
    struct drm_omap_param *args = data;

    DBG("%p: param=%llu", dev, args->param);

    switch (args->param) {
    case OMAP_PARAM_CHIPSET_ID:
        args->value = GET_OMAP_TYPE;
        break;
    default:
        DBG("unknown parameter %lld", args->param);
        return -EINVAL;
    }

    return 0;
}

static int ioctl_set_param(struct drm_device *dev, void *data,
        struct drm_file *file_priv)
{
    struct drm_omap_param *args = data;

    switch (args->param) {
    default:
        DBG("unknown parameter %lld", args->param);
        return -EINVAL;
    }

    return 0;
}

static int ioctl_gem_new(struct drm_device *dev, void *data,
        struct drm_file *file_priv)
{
    struct drm_omap_gem_new *args = data;
    DBG("%p:%p: size=0x%08x, flags=%08x", dev, file_priv,
            args->size.bytes, args->flags);
    return omap_gem_new_handle(dev, file_priv, args->size,
            args->flags, &args->handle);
}

static int ioctl_gem_cpu_prep(struct drm_device *dev, void *data,
        struct drm_file *file_priv)
{
    struct drm_omap_gem_cpu_prep *args = data;
    struct drm_gem_object *obj;
    int ret;

    VERB("%p:%p: handle=%d, op=%x", dev, file_priv, args->handle, args->op);

    obj = drm_gem_object_lookup(dev, file_priv, args->handle);
    if (!obj) {
        return -ENOENT;
    }

    ret = omap_gem_op_sync(obj, args->op);

    if (!ret) {
        ret = omap_gem_op_start(obj, args->op);
    }

    drm_gem_object_unreference_unlocked(obj);

    return ret;
}

static int ioctl_gem_cpu_fini(struct drm_device *dev, void *data,
        struct drm_file *file_priv)
{
    struct drm_omap_gem_cpu_fini *args = data;
    struct drm_gem_object *obj;
    int ret;

    VERB("%p:%p: handle=%d", dev, file_priv, args->handle);

    obj = drm_gem_object_lookup(dev, file_priv, args->handle);
    if (!obj) {
        return -ENOENT;
    }

    /* XXX flushy, flushy */
    ret = 0;

    if (!ret) {
        ret = omap_gem_op_finish(obj, args->op);
    }

    drm_gem_object_unreference_unlocked(obj);

    return ret;
}

static int ioctl_gem_info(struct drm_device *dev, void *data,
        struct drm_file *file_priv)
{
    struct drm_omap_gem_info *args = data;
    struct drm_gem_object *obj;
    int ret = 0;

    DBG("%p:%p: handle=%d", dev, file_priv, args->handle);

    obj = drm_gem_object_lookup(dev, file_priv, args->handle);
    if (!obj) {
        return -ENOENT;
    }

    args->size = omap_gem_mmap_size(obj);
    args->offset = omap_gem_mmap_offset(obj);

    drm_gem_object_unreference_unlocked(obj);

    return ret;
}

struct drm_ioctl_desc ioctls[DRM_COMMAND_END - DRM_COMMAND_BASE] = {
    DRM_IOCTL_DEF_DRV(OMAP_GET_PARAM, ioctl_get_param, DRM_UNLOCKED|DRM_AUTH),
    DRM_IOCTL_DEF_DRV(OMAP_SET_PARAM, ioctl_set_param, DRM_UNLOCKED|DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
    DRM_IOCTL_DEF_DRV(OMAP_GEM_NEW, ioctl_gem_new, DRM_UNLOCKED|DRM_AUTH),
    DRM_IOCTL_DEF_DRV(OMAP_GEM_CPU_PREP, ioctl_gem_cpu_prep, DRM_UNLOCKED|DRM_AUTH),
    DRM_IOCTL_DEF_DRV(OMAP_GEM_CPU_FINI, ioctl_gem_cpu_fini, DRM_UNLOCKED|DRM_AUTH),
    DRM_IOCTL_DEF_DRV(OMAP_GEM_INFO, ioctl_gem_info, DRM_UNLOCKED|DRM_AUTH),
};

/*
 * drm driver funcs
 */

static int dev_load(struct drm_device *dev, unsigned long flags)
{
    struct omap_drm_private *priv;
    int ret;

    DBG("load: dev=%p", dev);

    drm_device = dev;

    priv = kzalloc(sizeof(*priv), GFP_KERNEL);
    if (!priv) {
        dev_err(dev->dev, "could not allocate priv\n");
        return -ENOMEM;
    }

    dev->dev_private = priv;

    priv->wq = alloc_ordered_workqueue("omapdrm", 0);

    INIT_LIST_HEAD(&priv->obj_list);

    omap_gem_init(dev);

    ret = omap_modeset_init(dev);
    if (ret) {
        dev_err(dev->dev, "omap_modeset_init failed: ret=%d\n", ret);
        dev->dev_private = NULL;
        kfree(priv);
        return ret;
    }

    priv->fbdev = omap_fbdev_init(dev);
    if (!priv->fbdev) {
        dev_warn(dev->dev, "omap_fbdev_init failed\n");
        /* well, limp along without an fbdev.. maybe X11 will work? */
    }

    drm_kms_helper_poll_init(dev);

    ret = drm_vblank_init(dev, priv->num_crtcs);
    if (ret) {
        dev_warn(dev->dev, "could not init vblank\n");
    }

    return 0;
}

static int dev_unload(struct drm_device *dev)
{
    struct omap_drm_private *priv = dev->dev_private;

    DBG("unload: dev=%p", dev);

    drm_vblank_cleanup(dev);
    drm_kms_helper_poll_fini(dev);

    omap_fbdev_free(dev);
    omap_modeset_free(dev);
    omap_gem_deinit(dev);

    flush_workqueue(priv->wq);
    destroy_workqueue(priv->wq);

    kfree(dev->dev_private);
    dev->dev_private = NULL;

    return 0;
}

static int dev_open(struct drm_device *dev, struct drm_file *file)
{
    file->driver_priv = NULL;

    DBG("open: dev=%p, file=%p", dev, file);

    return 0;
}

static int dev_firstopen(struct drm_device *dev)
{
    DBG("firstopen: dev=%p", dev);
    return 0;
}

static void dev_lastclose(struct drm_device *dev)
{
    int i;

    /* we don't support vga-switcheroo.. so just make sure the fbdev
     * mode is active
     */
    struct omap_drm_private *priv = dev->dev_private;
    int ret;

    DBG("lastclose: dev=%p", dev);

    /* need to restore default rotation state.. not sure if there is
     * a cleaner way to restore properties to default state?  Maybe
     * a flag that properties should automatically be restored to
     * default state on lastclose?
     */
    for (i = 0; i < priv->num_crtcs; i++) {
        drm_object_property_set_value(&priv->crtcs[i]->base,
                priv->rotation_prop, 0);
    }

    for (i = 0; i < priv->num_planes; i++) {
        drm_object_property_set_value(&priv->planes[i]->base,
                priv->rotation_prop, 0);
    }

    ret = drm_fb_helper_restore_fbdev_mode(priv->fbdev);
    if (ret)
        DBG("failed to restore crtc mode");
}

static void dev_preclose(struct drm_device *dev, struct drm_file *file)
{
    DBG("preclose: dev=%p", dev);
}

static void dev_postclose(struct drm_device *dev, struct drm_file *file)
{
    DBG("postclose: dev=%p, file=%p", dev, file);
}

static int dev_enable_vblank(struct drm_device *dev, int crtc)
{
    DBG("enable_vblank: dev=%p, crtc=%d", dev, crtc);
    return 0;
}

static void dev_disable_vblank(struct drm_device *dev, int crtc)
{
    DBG("disable_vblank: dev=%p, crtc=%d", dev, crtc);
}

static irqreturn_t dev_irq_handler(DRM_IRQ_ARGS)
{
    return IRQ_HANDLED;
}

static void dev_irq_preinstall(struct drm_device *dev)
{
    DBG("irq_preinstall: dev=%p", dev);
}

static int dev_irq_postinstall(struct drm_device *dev)
{
    DBG("irq_postinstall: dev=%p", dev);
    return 0;
}

static void dev_irq_uninstall(struct drm_device *dev)
{
    DBG("irq_uninstall: dev=%p", dev);
}

static const struct vm_operations_struct omap_gem_vm_ops = {
    .fault = omap_gem_fault,
    .open = drm_gem_vm_open,
    .close = drm_gem_vm_close,
};

static const struct file_operations omapdriver_fops = {
        .owner = THIS_MODULE,
        .open = drm_open,
        .unlocked_ioctl = drm_ioctl,
        .release = drm_release,
        .mmap = omap_gem_mmap,
        .poll = drm_poll,
        .fasync = drm_fasync,
        .read = drm_read,
        .llseek = noop_llseek,
};

static struct drm_driver omap_drm_driver = {
        .driver_features =
                DRIVER_HAVE_IRQ | DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
        .load = dev_load,
        .unload = dev_unload,
        .open = dev_open,
        .firstopen = dev_firstopen,
        .lastclose = dev_lastclose,
        .preclose = dev_preclose,
        .postclose = dev_postclose,
        .get_vblank_counter = drm_vblank_count,
        .enable_vblank = dev_enable_vblank,
        .disable_vblank = dev_disable_vblank,
        .irq_preinstall = dev_irq_preinstall,
        .irq_postinstall = dev_irq_postinstall,
        .irq_uninstall = dev_irq_uninstall,
        .irq_handler = dev_irq_handler,
#ifdef CONFIG_DEBUG_FS
        .debugfs_init = omap_debugfs_init,
        .debugfs_cleanup = omap_debugfs_cleanup,
#endif
        .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
        .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
        .gem_prime_export = omap_gem_prime_export,
        .gem_prime_import = omap_gem_prime_import,
        .gem_init_object = omap_gem_init_object,
        .gem_free_object = omap_gem_free_object,
        .gem_vm_ops = &omap_gem_vm_ops,
        .dumb_create = omap_gem_dumb_create,
        .dumb_map_offset = omap_gem_dumb_map_offset,
        .dumb_destroy = omap_gem_dumb_destroy,
        .ioctls = ioctls,
        .num_ioctls = DRM_OMAP_NUM_IOCTLS,
        .fops = &omapdriver_fops,
        .name = DRIVER_NAME,
        .desc = DRIVER_DESC,
        .date = DRIVER_DATE,
        .major = DRIVER_MAJOR,
        .minor = DRIVER_MINOR,
        .patchlevel = DRIVER_PATCHLEVEL,
};

static int pdev_suspend(struct platform_device *pDevice, pm_message_t state)
{
    DBG("");
    return 0;
}

static int pdev_resume(struct platform_device *device)
{
    DBG("");
    return 0;
}

static void pdev_shutdown(struct platform_device *device)
{
    DBG("");
}

static int pdev_probe(struct platform_device *device)
{
    DBG("%s", device->name);
    return drm_platform_init(&omap_drm_driver, device);
}

static int pdev_remove(struct platform_device *device)
{
    DBG("");
    drm_platform_exit(&omap_drm_driver, device);

    platform_driver_unregister(&omap_dmm_driver);
    return 0;
}

struct platform_driver pdev = {
        .driver = {
            .name = DRIVER_NAME,
            .owner = THIS_MODULE,
        },
        .probe = pdev_probe,
        .remove = pdev_remove,
        .suspend = pdev_suspend,
        .resume = pdev_resume,
        .shutdown = pdev_shutdown,
};

static int __init omap_drm_init(void)
{
    DBG("init");
    if (platform_driver_register(&omap_dmm_driver)) {
        /* we can continue on without DMM.. so not fatal */
        dev_err(NULL, "DMM registration failed\n");
    }
    return platform_driver_register(&pdev);
}

static void __exit omap_drm_fini(void)
{
    DBG("fini");
    platform_driver_unregister(&pdev);
}

/* need late_initcall() so we load after dss_driver's are loaded */
late_initcall(omap_drm_init);
module_exit(omap_drm_fini);

MODULE_AUTHOR("Rob Clark <[email protected]>");
MODULE_DESCRIPTION("OMAP DRM Display Driver");
MODULE_ALIAS("platform:" DRIVER_NAME);
MODULE_LICENSE("GPL v2");