Orange Pi5 kernel

/*
 * Copyright © 2007 David Airlie
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *     David Airlie
 */
 
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/sysrq.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/screen_info.h>
#include <linux/vga_switcheroo.h>
#include <linux/console.h>
 
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_atomic.h>
 
#include "nouveau_drv.h"
#include "nouveau_gem.h"
#include "nouveau_bo.h"
#include "nouveau_fbcon.h"
#include "nouveau_chan.h"
#include "nouveau_vmm.h"
 
#include "nouveau_crtc.h"
 
MODULE_PARM_DESC(nofbaccel, "Disable fbcon acceleration");
int nouveau_nofbaccel = 0;
module_param_named(nofbaccel, nouveau_nofbaccel, int, 0400);
 
MODULE_PARM_DESC(fbcon_bpp, "fbcon bits-per-pixel (default: auto)");
static int nouveau_fbcon_bpp;
module_param_named(fbcon_bpp, nouveau_fbcon_bpp, int, 0400);
 
static void
nouveau_fbcon_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
{
<------>struct nouveau_fbdev *fbcon = info->par;
<------>struct nouveau_drm *drm = nouveau_drm(fbcon->helper.dev);
<------>struct nvif_device *device = &drm->client.device;
<------>int ret;
 
<------>if (info->state != FBINFO_STATE_RUNNING)
<------><------>return;
 
<------>ret = -ENODEV;
<------>if (!in_interrupt() && !(info->flags & FBINFO_HWACCEL_DISABLED) &&
<------>    mutex_trylock(&drm->client.mutex)) {
<------><------>if (device->info.family < NV_DEVICE_INFO_V0_TESLA)
<------><------><------>ret = nv04_fbcon_fillrect(info, rect);
<------><------>else
<------><------>if (device->info.family < NV_DEVICE_INFO_V0_FERMI)
<------><------><------>ret = nv50_fbcon_fillrect(info, rect);
<------><------>else
<------><------><------>ret = nvc0_fbcon_fillrect(info, rect);
<------><------>mutex_unlock(&drm->client.mutex);
<------>}
 
<------>if (ret == 0)
<------><------>return;
 
<------>if (ret != -ENODEV)
<------><------>nouveau_fbcon_gpu_lockup(info);
<------>drm_fb_helper_cfb_fillrect(info, rect);
}
 
static void
nouveau_fbcon_copyarea(struct fb_info *info, const struct fb_copyarea *image)
{
<------>struct nouveau_fbdev *fbcon = info->par;
<------>struct nouveau_drm *drm = nouveau_drm(fbcon->helper.dev);
<------>struct nvif_device *device = &drm->client.device;
<------>int ret;
 
<------>if (info->state != FBINFO_STATE_RUNNING)
<------><------>return;
 
<------>ret = -ENODEV;
<------>if (!in_interrupt() && !(info->flags & FBINFO_HWACCEL_DISABLED) &&
<------>    mutex_trylock(&drm->client.mutex)) {
<------><------>if (device->info.family < NV_DEVICE_INFO_V0_TESLA)
<------><------><------>ret = nv04_fbcon_copyarea(info, image);
<------><------>else
<------><------>if (device->info.family < NV_DEVICE_INFO_V0_FERMI)
<------><------><------>ret = nv50_fbcon_copyarea(info, image);
<------><------>else
<------><------><------>ret = nvc0_fbcon_copyarea(info, image);
<------><------>mutex_unlock(&drm->client.mutex);
<------>}
 
<------>if (ret == 0)
<------><------>return;
 
<------>if (ret != -ENODEV)
<------><------>nouveau_fbcon_gpu_lockup(info);
<------>drm_fb_helper_cfb_copyarea(info, image);
}
 
static void
nouveau_fbcon_imageblit(struct fb_info *info, const struct fb_image *image)
{
<------>struct nouveau_fbdev *fbcon = info->par;
<------>struct nouveau_drm *drm = nouveau_drm(fbcon->helper.dev);
<------>struct nvif_device *device = &drm->client.device;
<------>int ret;
 
<------>if (info->state != FBINFO_STATE_RUNNING)
<------><------>return;
 
<------>ret = -ENODEV;
<------>if (!in_interrupt() && !(info->flags & FBINFO_HWACCEL_DISABLED) &&
<------>    mutex_trylock(&drm->client.mutex)) {
<------><------>if (device->info.family < NV_DEVICE_INFO_V0_TESLA)
<------><------><------>ret = nv04_fbcon_imageblit(info, image);
<------><------>else
<------><------>if (device->info.family < NV_DEVICE_INFO_V0_FERMI)
<------><------><------>ret = nv50_fbcon_imageblit(info, image);
<------><------>else
<------><------><------>ret = nvc0_fbcon_imageblit(info, image);
<------><------>mutex_unlock(&drm->client.mutex);
<------>}
 
<------>if (ret == 0)
<------><------>return;
 
<------>if (ret != -ENODEV)
<------><------>nouveau_fbcon_gpu_lockup(info);
<------>drm_fb_helper_cfb_imageblit(info, image);
}
 
static int
nouveau_fbcon_sync(struct fb_info *info)
{
<------>struct nouveau_fbdev *fbcon = info->par;
<------>struct nouveau_drm *drm = nouveau_drm(fbcon->helper.dev);
<------>struct nouveau_channel *chan = drm->channel;
<------>int ret;
 
<------>if (!chan || !chan->accel_done || in_interrupt() ||
<------>    info->state != FBINFO_STATE_RUNNING ||
<------>    info->flags & FBINFO_HWACCEL_DISABLED)
<------><------>return 0;
 
<------>if (!mutex_trylock(&drm->client.mutex))
<------><------>return 0;
 
<------>ret = nouveau_channel_idle(chan);
<------>mutex_unlock(&drm->client.mutex);
<------>if (ret) {
<------><------>nouveau_fbcon_gpu_lockup(info);
<------><------>return 0;
<------>}
 
<------>chan->accel_done = false;
<------>return 0;
}
 
static int
nouveau_fbcon_open(struct fb_info *info, int user)
{
<------>struct nouveau_fbdev *fbcon = info->par;
<------>struct nouveau_drm *drm = nouveau_drm(fbcon->helper.dev);
<------>int ret = pm_runtime_get_sync(drm->dev->dev);
<------>if (ret < 0 && ret != -EACCES) {
<------><------>pm_runtime_put(drm->dev->dev);
<------><------>return ret;
<------>}
<------>return 0;
}
 
static int
nouveau_fbcon_release(struct fb_info *info, int user)
{
<------>struct nouveau_fbdev *fbcon = info->par;
<------>struct nouveau_drm *drm = nouveau_drm(fbcon->helper.dev);
<------>pm_runtime_put(drm->dev->dev);
<------>return 0;
}
 
static const struct fb_ops nouveau_fbcon_ops = {
<------>.owner = THIS_MODULE,
<------>DRM_FB_HELPER_DEFAULT_OPS,
<------>.fb_open = nouveau_fbcon_open,
<------>.fb_release = nouveau_fbcon_release,
<------>.fb_fillrect = nouveau_fbcon_fillrect,
<------>.fb_copyarea = nouveau_fbcon_copyarea,
<------>.fb_imageblit = nouveau_fbcon_imageblit,
<------>.fb_sync = nouveau_fbcon_sync,
};
 
static const struct fb_ops nouveau_fbcon_sw_ops = {
<------>.owner = THIS_MODULE,
<------>DRM_FB_HELPER_DEFAULT_OPS,
<------>.fb_open = nouveau_fbcon_open,
<------>.fb_release = nouveau_fbcon_release,
<------>.fb_fillrect = drm_fb_helper_cfb_fillrect,
<------>.fb_copyarea = drm_fb_helper_cfb_copyarea,
<------>.fb_imageblit = drm_fb_helper_cfb_imageblit,
};
 
void
nouveau_fbcon_accel_save_disable(struct drm_device *dev)
{
<------>struct nouveau_drm *drm = nouveau_drm(dev);
<------>if (drm->fbcon && drm->fbcon->helper.fbdev) {
<------><------>drm->fbcon->saved_flags = drm->fbcon->helper.fbdev->flags;
<------><------>drm->fbcon->helper.fbdev->flags |= FBINFO_HWACCEL_DISABLED;
<------>}
}
 
void
nouveau_fbcon_accel_restore(struct drm_device *dev)
{
<------>struct nouveau_drm *drm = nouveau_drm(dev);
<------>if (drm->fbcon && drm->fbcon->helper.fbdev) {
<------><------>drm->fbcon->helper.fbdev->flags = drm->fbcon->saved_flags;
<------>}
}
 
static void
nouveau_fbcon_accel_fini(struct drm_device *dev)
{
<------>struct nouveau_drm *drm = nouveau_drm(dev);
<------>struct nouveau_fbdev *fbcon = drm->fbcon;
<------>if (fbcon && drm->channel) {
<------><------>console_lock();
<------><------>if (fbcon->helper.fbdev)
<------><------><------>fbcon->helper.fbdev->flags |= FBINFO_HWACCEL_DISABLED;
<------><------>console_unlock();
<------><------>nouveau_channel_idle(drm->channel);
<------><------>nvif_object_dtor(&fbcon->twod);
<------><------>nvif_object_dtor(&fbcon->blit);
<------><------>nvif_object_dtor(&fbcon->gdi);
<------><------>nvif_object_dtor(&fbcon->patt);
<------><------>nvif_object_dtor(&fbcon->rop);
<------><------>nvif_object_dtor(&fbcon->clip);
<------><------>nvif_object_dtor(&fbcon->surf2d);
<------>}
}
 
static void
nouveau_fbcon_accel_init(struct drm_device *dev)
{
<------>struct nouveau_drm *drm = nouveau_drm(dev);
<------>struct nouveau_fbdev *fbcon = drm->fbcon;
<------>struct fb_info *info = fbcon->helper.fbdev;
<------>int ret;
 
<------>if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA)
<------><------>ret = nv04_fbcon_accel_init(info);
<------>else
<------>if (drm->client.device.info.family < NV_DEVICE_INFO_V0_FERMI)
<------><------>ret = nv50_fbcon_accel_init(info);
<------>else
<------><------>ret = nvc0_fbcon_accel_init(info);
 
<------>if (ret == 0)
<------><------>info->fbops = &nouveau_fbcon_ops;
}
 
static void
nouveau_fbcon_zfill(struct drm_device *dev, struct nouveau_fbdev *fbcon)
{
<------>struct fb_info *info = fbcon->helper.fbdev;
<------>struct fb_fillrect rect;
 
<------>/* Clear the entire fbcon.  The drm will program every connector
<------> * with it's preferred mode.  If the sizes differ, one display will
<------> * quite likely have garbage around the console.
<------> */
<------>rect.dx = rect.dy = 0;
<------>rect.width = info->var.xres_virtual;
<------>rect.height = info->var.yres_virtual;
<------>rect.color = 0;
<------>rect.rop = ROP_COPY;
<------>info->fbops->fb_fillrect(info, &rect);
}
 
static int
nouveau_fbcon_create(struct drm_fb_helper *helper,
<------><------>     struct drm_fb_helper_surface_size *sizes)
{
<------>struct nouveau_fbdev *fbcon =
<------><------>container_of(helper, struct nouveau_fbdev, helper);
<------>struct drm_device *dev = fbcon->helper.dev;
<------>struct nouveau_drm *drm = nouveau_drm(dev);
<------>struct nvif_device *device = &drm->client.device;
<------>struct fb_info *info;
<------>struct drm_framebuffer *fb;
<------>struct nouveau_channel *chan;
<------>struct nouveau_bo *nvbo;
<------>struct drm_mode_fb_cmd2 mode_cmd = {};
<------>int ret;
 
<------>mode_cmd.width = sizes->surface_width;
<------>mode_cmd.height = sizes->surface_height;
 
<------>mode_cmd.pitches[0] = mode_cmd.width * (sizes->surface_bpp >> 3);
<------>mode_cmd.pitches[0] = roundup(mode_cmd.pitches[0], 256);
 
<------>mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
<------><------><------><------><------><------><------>  sizes->surface_depth);
 
<------>ret = nouveau_gem_new(&drm->client, mode_cmd.pitches[0] *
<------><------><------>      mode_cmd.height, 0, NOUVEAU_GEM_DOMAIN_VRAM,
<------><------><------>      0, 0x0000, &nvbo);
<------>if (ret) {
<------><------>NV_ERROR(drm, "failed to allocate framebuffer\n");
<------><------>goto out;
<------>}
 
<------>ret = nouveau_framebuffer_new(dev, &mode_cmd, &nvbo->bo.base, &fb);
<------>if (ret)
<------><------>goto out_unref;
 
<------>ret = nouveau_bo_pin(nvbo, NOUVEAU_GEM_DOMAIN_VRAM, false);
<------>if (ret) {
<------><------>NV_ERROR(drm, "failed to pin fb: %d\n", ret);
<------><------>goto out_unref;
<------>}
 
<------>ret = nouveau_bo_map(nvbo);
<------>if (ret) {
<------><------>NV_ERROR(drm, "failed to map fb: %d\n", ret);
<------><------>goto out_unpin;
<------>}
 
<------>chan = nouveau_nofbaccel ? NULL : drm->channel;
<------>if (chan && device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
<------><------>ret = nouveau_vma_new(nvbo, chan->vmm, &fbcon->vma);
<------><------>if (ret) {
<------><------><------>NV_ERROR(drm, "failed to map fb into chan: %d\n", ret);
<------><------><------>chan = NULL;
<------><------>}
<------>}
 
<------>info = drm_fb_helper_alloc_fbi(helper);
<------>if (IS_ERR(info)) {
<------><------>ret = PTR_ERR(info);
<------><------>goto out_unlock;
<------>}
 
<------>/* setup helper */
<------>fbcon->helper.fb = fb;
 
<------>if (!chan)
<------><------>info->flags = FBINFO_HWACCEL_DISABLED;
<------>else
<------><------>info->flags = FBINFO_HWACCEL_COPYAREA |
<------><------><------>      FBINFO_HWACCEL_FILLRECT |
<------><------><------>      FBINFO_HWACCEL_IMAGEBLIT;
<------>info->fbops = &nouveau_fbcon_sw_ops;
<------>info->fix.smem_start = nvbo->bo.mem.bus.offset;
<------>info->fix.smem_len = nvbo->bo.mem.num_pages << PAGE_SHIFT;
 
<------>info->screen_base = nvbo_kmap_obj_iovirtual(nvbo);
<------>info->screen_size = nvbo->bo.mem.num_pages << PAGE_SHIFT;
 
<------>drm_fb_helper_fill_info(info, &fbcon->helper, sizes);
 
<------>/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 
<------>if (chan)
<------><------>nouveau_fbcon_accel_init(dev);
<------>nouveau_fbcon_zfill(dev, fbcon);
 
<------>/* To allow resizeing without swapping buffers */
<------>NV_INFO(drm, "allocated %dx%d fb: 0x%llx, bo %p\n",
<------><------>fb->width, fb->height, nvbo->offset, nvbo);
 
<------>vga_switcheroo_client_fb_set(dev->pdev, info);
<------>return 0;
 
out_unlock:
<------>if (chan)
<------><------>nouveau_vma_del(&fbcon->vma);
<------>nouveau_bo_unmap(nvbo);
out_unpin:
<------>nouveau_bo_unpin(nvbo);
out_unref:
<------>nouveau_bo_ref(NULL, &nvbo);
out:
<------>return ret;
}
 
static int
nouveau_fbcon_destroy(struct drm_device *dev, struct nouveau_fbdev *fbcon)
{
<------>struct drm_framebuffer *fb = fbcon->helper.fb;
<------>struct nouveau_bo *nvbo;
 
<------>drm_fb_helper_unregister_fbi(&fbcon->helper);
<------>drm_fb_helper_fini(&fbcon->helper);
 
<------>if (fb && fb->obj[0]) {
<------><------>nvbo = nouveau_gem_object(fb->obj[0]);
<------><------>nouveau_vma_del(&fbcon->vma);
<------><------>nouveau_bo_unmap(nvbo);
<------><------>nouveau_bo_unpin(nvbo);
<------><------>drm_framebuffer_put(fb);
<------>}
 
<------>return 0;
}
 
void nouveau_fbcon_gpu_lockup(struct fb_info *info)
{
<------>struct nouveau_fbdev *fbcon = info->par;
<------>struct nouveau_drm *drm = nouveau_drm(fbcon->helper.dev);
 
<------>NV_ERROR(drm, "GPU lockup - switching to software fbcon\n");
<------>info->flags |= FBINFO_HWACCEL_DISABLED;
}
 
static const struct drm_fb_helper_funcs nouveau_fbcon_helper_funcs = {
<------>.fb_probe = nouveau_fbcon_create,
};
 
static void
nouveau_fbcon_set_suspend_work(struct work_struct *work)
{
<------>struct nouveau_drm *drm = container_of(work, typeof(*drm), fbcon_work);
<------>int state = READ_ONCE(drm->fbcon_new_state);
 
<------>if (state == FBINFO_STATE_RUNNING)
<------><------>pm_runtime_get_sync(drm->dev->dev);
 
<------>console_lock();
<------>if (state == FBINFO_STATE_RUNNING)
<------><------>nouveau_fbcon_accel_restore(drm->dev);
<------>drm_fb_helper_set_suspend(&drm->fbcon->helper, state);
<------>if (state != FBINFO_STATE_RUNNING)
<------><------>nouveau_fbcon_accel_save_disable(drm->dev);
<------>console_unlock();
 
<------>if (state == FBINFO_STATE_RUNNING) {
<------><------>nouveau_fbcon_hotplug_resume(drm->fbcon);
<------><------>pm_runtime_mark_last_busy(drm->dev->dev);
<------><------>pm_runtime_put_sync(drm->dev->dev);
<------>}
}
 
void
nouveau_fbcon_set_suspend(struct drm_device *dev, int state)
{
<------>struct nouveau_drm *drm = nouveau_drm(dev);
 
<------>if (!drm->fbcon)
<------><------>return;
 
<------>drm->fbcon_new_state = state;
<------>/* Since runtime resume can happen as a result of a sysfs operation,
<------> * it's possible we already have the console locked. So handle fbcon
<------> * init/deinit from a seperate work thread
<------> */
<------>schedule_work(&drm->fbcon_work);
}
 
void
nouveau_fbcon_output_poll_changed(struct drm_device *dev)
{
<------>struct nouveau_drm *drm = nouveau_drm(dev);
<------>struct nouveau_fbdev *fbcon = drm->fbcon;
<------>int ret;
 
<------>if (!fbcon)
<------><------>return;
 
<------>mutex_lock(&fbcon->hotplug_lock);
 
<------>ret = pm_runtime_get(dev->dev);
<------>if (ret == 1 || ret == -EACCES) {
<------><------>drm_fb_helper_hotplug_event(&fbcon->helper);
 
<------><------>pm_runtime_mark_last_busy(dev->dev);
<------><------>pm_runtime_put_autosuspend(dev->dev);
<------>} else if (ret == 0) {
<------><------>/* If the GPU was already in the process of suspending before
<------><------> * this event happened, then we can't block here as we'll
<------><------> * deadlock the runtime pmops since they wait for us to
<------><------> * finish. So, just defer this event for when we runtime
<------><------> * resume again. It will be handled by fbcon_work.
<------><------> */
<------><------>NV_DEBUG(drm, "fbcon HPD event deferred until runtime resume\n");
<------><------>fbcon->hotplug_waiting = true;
<------><------>pm_runtime_put_noidle(drm->dev->dev);
<------>} else {
<------><------>DRM_WARN("fbcon HPD event lost due to RPM failure: %d\n",
<------><------><------> ret);
<------>}
 
<------>mutex_unlock(&fbcon->hotplug_lock);
}
 
void
nouveau_fbcon_hotplug_resume(struct nouveau_fbdev *fbcon)
{
<------>struct nouveau_drm *drm;
 
<------>if (!fbcon)
<------><------>return;
<------>drm = nouveau_drm(fbcon->helper.dev);
 
<------>mutex_lock(&fbcon->hotplug_lock);
<------>if (fbcon->hotplug_waiting) {
<------><------>fbcon->hotplug_waiting = false;
 
<------><------>NV_DEBUG(drm, "Handling deferred fbcon HPD events\n");
<------><------>drm_fb_helper_hotplug_event(&fbcon->helper);
<------>}
<------>mutex_unlock(&fbcon->hotplug_lock);
}
 
int
nouveau_fbcon_init(struct drm_device *dev)
{
<------>struct nouveau_drm *drm = nouveau_drm(dev);
<------>struct nouveau_fbdev *fbcon;
<------>int preferred_bpp = nouveau_fbcon_bpp;
<------>int ret;
 
<------>if (!dev->mode_config.num_crtc ||
<------>    (dev->pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
<------><------>return 0;
 
<------>fbcon = kzalloc(sizeof(struct nouveau_fbdev), GFP_KERNEL);
<------>if (!fbcon)
<------><------>return -ENOMEM;
 
<------>drm->fbcon = fbcon;
<------>INIT_WORK(&drm->fbcon_work, nouveau_fbcon_set_suspend_work);
<------>mutex_init(&fbcon->hotplug_lock);
 
<------>drm_fb_helper_prepare(dev, &fbcon->helper, &nouveau_fbcon_helper_funcs);
 
<------>ret = drm_fb_helper_init(dev, &fbcon->helper);
<------>if (ret)
<------><------>goto free;
 
<------>if (preferred_bpp != 8 && preferred_bpp != 16 && preferred_bpp != 32) {
<------><------>if (drm->client.device.info.ram_size <= 32 * 1024 * 1024)
<------><------><------>preferred_bpp = 8;
<------><------>else
<------><------>if (drm->client.device.info.ram_size <= 64 * 1024 * 1024)
<------><------><------>preferred_bpp = 16;
<------><------>else
<------><------><------>preferred_bpp = 32;
<------>}
 
<------>/* disable all the possible outputs/crtcs before entering KMS mode */
<------>if (!drm_drv_uses_atomic_modeset(dev))
<------><------>drm_helper_disable_unused_functions(dev);
 
<------>ret = drm_fb_helper_initial_config(&fbcon->helper, preferred_bpp);
<------>if (ret)
<------><------>goto fini;
 
<------>if (fbcon->helper.fbdev)
<------><------>fbcon->helper.fbdev->pixmap.buf_align = 4;
<------>return 0;
 
fini:
<------>drm_fb_helper_fini(&fbcon->helper);
free:
<------>kfree(fbcon);
<------>drm->fbcon = NULL;
<------>return ret;
}
 
void
nouveau_fbcon_fini(struct drm_device *dev)
{
<------>struct nouveau_drm *drm = nouveau_drm(dev);
 
<------>if (!drm->fbcon)
<------><------>return;
 
<------>nouveau_fbcon_accel_fini(dev);
<------>nouveau_fbcon_destroy(dev, drm->fbcon);
<------>kfree(drm->fbcon);
<------>drm->fbcon = NULL;
}