18ab59da2SThomas Zimmermann // SPDX-License-Identifier: MIT
28ab59da2SThomas Zimmermann
38ab59da2SThomas Zimmermann #include <linux/moduleparam.h>
4478f6213SThomas Zimmermann #include <linux/vmalloc.h>
58ab59da2SThomas Zimmermann
68ab59da2SThomas Zimmermann #include <drm/drm_crtc_helper.h>
78ab59da2SThomas Zimmermann #include <drm/drm_drv.h>
88ab59da2SThomas Zimmermann #include <drm/drm_fb_helper.h>
98ab59da2SThomas Zimmermann #include <drm/drm_framebuffer.h>
108fbc9af5SThomas Zimmermann #include <drm/drm_gem.h>
118ab59da2SThomas Zimmermann #include <drm/drm_print.h>
128ab59da2SThomas Zimmermann
138ab59da2SThomas Zimmermann #include <drm/drm_fbdev_generic.h>
148ab59da2SThomas Zimmermann
158ab59da2SThomas Zimmermann /* @user: 1=userspace, 0=fbcon */
drm_fbdev_generic_fb_open(struct fb_info * info,int user)16b9c93f4eSThomas Zimmermann static int drm_fbdev_generic_fb_open(struct fb_info *info, int user)
178ab59da2SThomas Zimmermann {
188ab59da2SThomas Zimmermann struct drm_fb_helper *fb_helper = info->par;
198ab59da2SThomas Zimmermann
208ab59da2SThomas Zimmermann /* No need to take a ref for fbcon because it unbinds on unregister */
218ab59da2SThomas Zimmermann if (user && !try_module_get(fb_helper->dev->driver->fops->owner))
228ab59da2SThomas Zimmermann return -ENODEV;
238ab59da2SThomas Zimmermann
248ab59da2SThomas Zimmermann return 0;
258ab59da2SThomas Zimmermann }
268ab59da2SThomas Zimmermann
drm_fbdev_generic_fb_release(struct fb_info * info,int user)27b9c93f4eSThomas Zimmermann static int drm_fbdev_generic_fb_release(struct fb_info *info, int user)
288ab59da2SThomas Zimmermann {
298ab59da2SThomas Zimmermann struct drm_fb_helper *fb_helper = info->par;
308ab59da2SThomas Zimmermann
318ab59da2SThomas Zimmermann if (user)
328ab59da2SThomas Zimmermann module_put(fb_helper->dev->driver->fops->owner);
338ab59da2SThomas Zimmermann
348ab59da2SThomas Zimmermann return 0;
358ab59da2SThomas Zimmermann }
368ab59da2SThomas Zimmermann
37*744d35d3SThomas Zimmermann FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(drm_fbdev_generic,
38c6baad68SThomas Zimmermann drm_fb_helper_damage_range,
39c6baad68SThomas Zimmermann drm_fb_helper_damage_area);
40c6baad68SThomas Zimmermann
drm_fbdev_generic_fb_destroy(struct fb_info * info)41b9c93f4eSThomas Zimmermann static void drm_fbdev_generic_fb_destroy(struct fb_info *info)
428ab59da2SThomas Zimmermann {
437f5fe873SThomas Zimmermann struct drm_fb_helper *fb_helper = info->par;
44a5b44c4aSThomas Zimmermann void *shadow = info->screen_buffer;
458ab59da2SThomas Zimmermann
468ab59da2SThomas Zimmermann if (!fb_helper->dev)
478ab59da2SThomas Zimmermann return;
488ab59da2SThomas Zimmermann
496ca80b9eSThomas Zimmermann fb_deferred_io_cleanup(info);
508ab59da2SThomas Zimmermann drm_fb_helper_fini(fb_helper);
518ab59da2SThomas Zimmermann vfree(shadow);
528ab59da2SThomas Zimmermann drm_client_framebuffer_delete(fb_helper->buffer);
533fb1f62fSThomas Zimmermann
54a5b44c4aSThomas Zimmermann drm_client_release(&fb_helper->client);
553fb1f62fSThomas Zimmermann drm_fb_helper_unprepare(fb_helper);
568ab59da2SThomas Zimmermann kfree(fb_helper);
578ab59da2SThomas Zimmermann }
588ab59da2SThomas Zimmermann
59b9c93f4eSThomas Zimmermann static const struct fb_ops drm_fbdev_generic_fb_ops = {
608ab59da2SThomas Zimmermann .owner = THIS_MODULE,
61b9c93f4eSThomas Zimmermann .fb_open = drm_fbdev_generic_fb_open,
62b9c93f4eSThomas Zimmermann .fb_release = drm_fbdev_generic_fb_release,
63c6baad68SThomas Zimmermann FB_DEFAULT_DEFERRED_OPS(drm_fbdev_generic),
64a5b44c4aSThomas Zimmermann DRM_FB_HELPER_DEFAULT_OPS,
65b9c93f4eSThomas Zimmermann .fb_destroy = drm_fbdev_generic_fb_destroy,
668ab59da2SThomas Zimmermann };
678ab59da2SThomas Zimmermann
688ab59da2SThomas Zimmermann /*
698ab59da2SThomas Zimmermann * This function uses the client API to create a framebuffer backed by a dumb buffer.
708ab59da2SThomas Zimmermann */
drm_fbdev_generic_helper_fb_probe(struct drm_fb_helper * fb_helper,struct drm_fb_helper_surface_size * sizes)71b9c93f4eSThomas Zimmermann static int drm_fbdev_generic_helper_fb_probe(struct drm_fb_helper *fb_helper,
728ab59da2SThomas Zimmermann struct drm_fb_helper_surface_size *sizes)
738ab59da2SThomas Zimmermann {
748ab59da2SThomas Zimmermann struct drm_client_dev *client = &fb_helper->client;
758ab59da2SThomas Zimmermann struct drm_device *dev = fb_helper->dev;
768ab59da2SThomas Zimmermann struct drm_client_buffer *buffer;
776ca80b9eSThomas Zimmermann struct fb_info *info;
788fbc9af5SThomas Zimmermann size_t screen_size;
7961b5d007SThomas Zimmermann void *screen_buffer;
808ab59da2SThomas Zimmermann u32 format;
818ab59da2SThomas Zimmermann int ret;
828ab59da2SThomas Zimmermann
838ab59da2SThomas Zimmermann drm_dbg_kms(dev, "surface width(%d), height(%d) and bpp(%d)\n",
848ab59da2SThomas Zimmermann sizes->surface_width, sizes->surface_height,
858ab59da2SThomas Zimmermann sizes->surface_bpp);
868ab59da2SThomas Zimmermann
878ab59da2SThomas Zimmermann format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
888ab59da2SThomas Zimmermann buffer = drm_client_framebuffer_create(client, sizes->surface_width,
898ab59da2SThomas Zimmermann sizes->surface_height, format);
908ab59da2SThomas Zimmermann if (IS_ERR(buffer))
918ab59da2SThomas Zimmermann return PTR_ERR(buffer);
928ab59da2SThomas Zimmermann
938ab59da2SThomas Zimmermann fb_helper->buffer = buffer;
948ab59da2SThomas Zimmermann fb_helper->fb = buffer->fb;
9561b5d007SThomas Zimmermann
968fbc9af5SThomas Zimmermann screen_size = buffer->gem->size;
9761b5d007SThomas Zimmermann screen_buffer = vzalloc(screen_size);
9861b5d007SThomas Zimmermann if (!screen_buffer) {
9961b5d007SThomas Zimmermann ret = -ENOMEM;
10061b5d007SThomas Zimmermann goto err_drm_client_framebuffer_delete;
10161b5d007SThomas Zimmermann }
1028ab59da2SThomas Zimmermann
1036ca80b9eSThomas Zimmermann info = drm_fb_helper_alloc_info(fb_helper);
10461b5d007SThomas Zimmermann if (IS_ERR(info)) {
10561b5d007SThomas Zimmermann ret = PTR_ERR(info);
10661b5d007SThomas Zimmermann goto err_vfree;
10761b5d007SThomas Zimmermann }
1088ab59da2SThomas Zimmermann
1096ca80b9eSThomas Zimmermann drm_fb_helper_fill_info(info, fb_helper, sizes);
1108ab59da2SThomas Zimmermann
111b9c93f4eSThomas Zimmermann info->fbops = &drm_fbdev_generic_fb_ops;
11261b5d007SThomas Zimmermann
11361b5d007SThomas Zimmermann /* screen */
1146ca80b9eSThomas Zimmermann info->flags |= FBINFO_VIRTFB | FBINFO_READS_FAST;
11561b5d007SThomas Zimmermann info->screen_buffer = screen_buffer;
116a5b44c4aSThomas Zimmermann info->fix.smem_start = page_to_phys(vmalloc_to_page(info->screen_buffer));
11761b5d007SThomas Zimmermann info->fix.smem_len = screen_size;
118a5b44c4aSThomas Zimmermann
11961b5d007SThomas Zimmermann /* deferred I/O */
120d6591da5SJavier Martinez Canillas fb_helper->fbdefio.delay = HZ / 20;
121d6591da5SJavier Martinez Canillas fb_helper->fbdefio.deferred_io = drm_fb_helper_deferred_io;
122d6591da5SJavier Martinez Canillas
123aebd8f0cSDaniel Vetter info->fbdefio = &fb_helper->fbdefio;
124aebd8f0cSDaniel Vetter ret = fb_deferred_io_init(info);
125cc88ad78SJavier Martinez Canillas if (ret)
12661b5d007SThomas Zimmermann goto err_drm_fb_helper_release_info;
1278ab59da2SThomas Zimmermann
1288ab59da2SThomas Zimmermann return 0;
12961b5d007SThomas Zimmermann
13061b5d007SThomas Zimmermann err_drm_fb_helper_release_info:
13161b5d007SThomas Zimmermann drm_fb_helper_release_info(fb_helper);
13261b5d007SThomas Zimmermann err_vfree:
13361b5d007SThomas Zimmermann vfree(screen_buffer);
13461b5d007SThomas Zimmermann err_drm_client_framebuffer_delete:
13561b5d007SThomas Zimmermann fb_helper->fb = NULL;
13661b5d007SThomas Zimmermann fb_helper->buffer = NULL;
13761b5d007SThomas Zimmermann drm_client_framebuffer_delete(buffer);
13861b5d007SThomas Zimmermann return ret;
1398ab59da2SThomas Zimmermann }
1408ab59da2SThomas Zimmermann
drm_fbdev_generic_damage_blit_real(struct drm_fb_helper * fb_helper,struct drm_clip_rect * clip,struct iosys_map * dst)141b9c93f4eSThomas Zimmermann static void drm_fbdev_generic_damage_blit_real(struct drm_fb_helper *fb_helper,
1428ab59da2SThomas Zimmermann struct drm_clip_rect *clip,
1438ab59da2SThomas Zimmermann struct iosys_map *dst)
1448ab59da2SThomas Zimmermann {
1458ab59da2SThomas Zimmermann struct drm_framebuffer *fb = fb_helper->fb;
1468ab59da2SThomas Zimmermann size_t offset = clip->y1 * fb->pitches[0];
1478ab59da2SThomas Zimmermann size_t len = clip->x2 - clip->x1;
1488ab59da2SThomas Zimmermann unsigned int y;
1498ab59da2SThomas Zimmermann void *src;
1508ab59da2SThomas Zimmermann
1518ab59da2SThomas Zimmermann switch (drm_format_info_bpp(fb->format, 0)) {
1528ab59da2SThomas Zimmermann case 1:
1538ab59da2SThomas Zimmermann offset += clip->x1 / 8;
1548ab59da2SThomas Zimmermann len = DIV_ROUND_UP(len + clip->x1 % 8, 8);
1558ab59da2SThomas Zimmermann break;
1568ab59da2SThomas Zimmermann case 2:
1578ab59da2SThomas Zimmermann offset += clip->x1 / 4;
1588ab59da2SThomas Zimmermann len = DIV_ROUND_UP(len + clip->x1 % 4, 4);
1598ab59da2SThomas Zimmermann break;
1608ab59da2SThomas Zimmermann case 4:
1618ab59da2SThomas Zimmermann offset += clip->x1 / 2;
1628ab59da2SThomas Zimmermann len = DIV_ROUND_UP(len + clip->x1 % 2, 2);
1638ab59da2SThomas Zimmermann break;
1648ab59da2SThomas Zimmermann default:
1658ab59da2SThomas Zimmermann offset += clip->x1 * fb->format->cpp[0];
1668ab59da2SThomas Zimmermann len *= fb->format->cpp[0];
1678ab59da2SThomas Zimmermann break;
1688ab59da2SThomas Zimmermann }
1698ab59da2SThomas Zimmermann
1708ab59da2SThomas Zimmermann src = fb_helper->info->screen_buffer + offset;
1718ab59da2SThomas Zimmermann iosys_map_incr(dst, offset); /* go to first pixel within clip rect */
1728ab59da2SThomas Zimmermann
1738ab59da2SThomas Zimmermann for (y = clip->y1; y < clip->y2; y++) {
1748ab59da2SThomas Zimmermann iosys_map_memcpy_to(dst, 0, src, len);
1758ab59da2SThomas Zimmermann iosys_map_incr(dst, fb->pitches[0]);
1768ab59da2SThomas Zimmermann src += fb->pitches[0];
1778ab59da2SThomas Zimmermann }
1788ab59da2SThomas Zimmermann }
1798ab59da2SThomas Zimmermann
drm_fbdev_generic_damage_blit(struct drm_fb_helper * fb_helper,struct drm_clip_rect * clip)180b9c93f4eSThomas Zimmermann static int drm_fbdev_generic_damage_blit(struct drm_fb_helper *fb_helper,
1818ab59da2SThomas Zimmermann struct drm_clip_rect *clip)
1828ab59da2SThomas Zimmermann {
1838ab59da2SThomas Zimmermann struct drm_client_buffer *buffer = fb_helper->buffer;
1848ab59da2SThomas Zimmermann struct iosys_map map, dst;
1858ab59da2SThomas Zimmermann int ret;
1868ab59da2SThomas Zimmermann
1878ab59da2SThomas Zimmermann /*
1888ab59da2SThomas Zimmermann * We have to pin the client buffer to its current location while
1898ab59da2SThomas Zimmermann * flushing the shadow buffer. In the general case, concurrent
1908ab59da2SThomas Zimmermann * modesetting operations could try to move the buffer and would
1918ab59da2SThomas Zimmermann * fail. The modeset has to be serialized by acquiring the reservation
1928ab59da2SThomas Zimmermann * object of the underlying BO here.
1938ab59da2SThomas Zimmermann *
1948ab59da2SThomas Zimmermann * For fbdev emulation, we only have to protect against fbdev modeset
1958ab59da2SThomas Zimmermann * operations. Nothing else will involve the client buffer's BO. So it
1968ab59da2SThomas Zimmermann * is sufficient to acquire struct drm_fb_helper.lock here.
1978ab59da2SThomas Zimmermann */
1988ab59da2SThomas Zimmermann mutex_lock(&fb_helper->lock);
1998ab59da2SThomas Zimmermann
2008ab59da2SThomas Zimmermann ret = drm_client_buffer_vmap(buffer, &map);
2018ab59da2SThomas Zimmermann if (ret)
2028ab59da2SThomas Zimmermann goto out;
2038ab59da2SThomas Zimmermann
2048ab59da2SThomas Zimmermann dst = map;
205b9c93f4eSThomas Zimmermann drm_fbdev_generic_damage_blit_real(fb_helper, clip, &dst);
2068ab59da2SThomas Zimmermann
2078ab59da2SThomas Zimmermann drm_client_buffer_vunmap(buffer);
2088ab59da2SThomas Zimmermann
2098ab59da2SThomas Zimmermann out:
2108ab59da2SThomas Zimmermann mutex_unlock(&fb_helper->lock);
2118ab59da2SThomas Zimmermann
2128ab59da2SThomas Zimmermann return ret;
2138ab59da2SThomas Zimmermann }
2148ab59da2SThomas Zimmermann
drm_fbdev_generic_helper_fb_dirty(struct drm_fb_helper * helper,struct drm_clip_rect * clip)215b9c93f4eSThomas Zimmermann static int drm_fbdev_generic_helper_fb_dirty(struct drm_fb_helper *helper,
216b9c93f4eSThomas Zimmermann struct drm_clip_rect *clip)
2178ab59da2SThomas Zimmermann {
2188ab59da2SThomas Zimmermann struct drm_device *dev = helper->dev;
2198ab59da2SThomas Zimmermann int ret;
2208ab59da2SThomas Zimmermann
2218ab59da2SThomas Zimmermann /* Call damage handlers only if necessary */
2228ab59da2SThomas Zimmermann if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
2238ab59da2SThomas Zimmermann return 0;
2248ab59da2SThomas Zimmermann
225b9c93f4eSThomas Zimmermann ret = drm_fbdev_generic_damage_blit(helper, clip);
2268ab59da2SThomas Zimmermann if (drm_WARN_ONCE(dev, ret, "Damage blitter failed: ret=%d\n", ret))
2278ab59da2SThomas Zimmermann return ret;
2288ab59da2SThomas Zimmermann
2298ab59da2SThomas Zimmermann if (helper->fb->funcs->dirty) {
2308ab59da2SThomas Zimmermann ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
2318ab59da2SThomas Zimmermann if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret))
2328ab59da2SThomas Zimmermann return ret;
2338ab59da2SThomas Zimmermann }
2348ab59da2SThomas Zimmermann
2358ab59da2SThomas Zimmermann return 0;
2368ab59da2SThomas Zimmermann }
2378ab59da2SThomas Zimmermann
238b9c93f4eSThomas Zimmermann static const struct drm_fb_helper_funcs drm_fbdev_generic_helper_funcs = {
239b9c93f4eSThomas Zimmermann .fb_probe = drm_fbdev_generic_helper_fb_probe,
240b9c93f4eSThomas Zimmermann .fb_dirty = drm_fbdev_generic_helper_fb_dirty,
2418ab59da2SThomas Zimmermann };
2428ab59da2SThomas Zimmermann
drm_fbdev_generic_client_unregister(struct drm_client_dev * client)243b9c93f4eSThomas Zimmermann static void drm_fbdev_generic_client_unregister(struct drm_client_dev *client)
2448ab59da2SThomas Zimmermann {
2458ab59da2SThomas Zimmermann struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
2468ab59da2SThomas Zimmermann
247032116bbSThomas Zimmermann if (fb_helper->info) {
2488ab59da2SThomas Zimmermann drm_fb_helper_unregister_info(fb_helper);
249032116bbSThomas Zimmermann } else {
250032116bbSThomas Zimmermann drm_client_release(&fb_helper->client);
251032116bbSThomas Zimmermann drm_fb_helper_unprepare(fb_helper);
252032116bbSThomas Zimmermann kfree(fb_helper);
253032116bbSThomas Zimmermann }
2548ab59da2SThomas Zimmermann }
2558ab59da2SThomas Zimmermann
drm_fbdev_generic_client_restore(struct drm_client_dev * client)256b9c93f4eSThomas Zimmermann static int drm_fbdev_generic_client_restore(struct drm_client_dev *client)
2578ab59da2SThomas Zimmermann {
2588ab59da2SThomas Zimmermann drm_fb_helper_lastclose(client->dev);
2598ab59da2SThomas Zimmermann
2608ab59da2SThomas Zimmermann return 0;
2618ab59da2SThomas Zimmermann }
2628ab59da2SThomas Zimmermann
drm_fbdev_generic_client_hotplug(struct drm_client_dev * client)263b9c93f4eSThomas Zimmermann static int drm_fbdev_generic_client_hotplug(struct drm_client_dev *client)
2648ab59da2SThomas Zimmermann {
2658ab59da2SThomas Zimmermann struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
2668ab59da2SThomas Zimmermann struct drm_device *dev = client->dev;
2678ab59da2SThomas Zimmermann int ret;
2688ab59da2SThomas Zimmermann
2698ab59da2SThomas Zimmermann if (dev->fb_helper)
2708ab59da2SThomas Zimmermann return drm_fb_helper_hotplug_event(dev->fb_helper);
2718ab59da2SThomas Zimmermann
2728ab59da2SThomas Zimmermann ret = drm_fb_helper_init(dev, fb_helper);
2738ab59da2SThomas Zimmermann if (ret)
274643231b2SThomas Zimmermann goto err_drm_err;
2758ab59da2SThomas Zimmermann
2768ab59da2SThomas Zimmermann if (!drm_drv_uses_atomic_modeset(dev))
2778ab59da2SThomas Zimmermann drm_helper_disable_unused_functions(dev);
2788ab59da2SThomas Zimmermann
2796c80a93bSThomas Zimmermann ret = drm_fb_helper_initial_config(fb_helper);
2808ab59da2SThomas Zimmermann if (ret)
281643231b2SThomas Zimmermann goto err_drm_fb_helper_fini;
2828ab59da2SThomas Zimmermann
2838ab59da2SThomas Zimmermann return 0;
2848ab59da2SThomas Zimmermann
285643231b2SThomas Zimmermann err_drm_fb_helper_fini:
286643231b2SThomas Zimmermann drm_fb_helper_fini(fb_helper);
287643231b2SThomas Zimmermann err_drm_err:
2888ab59da2SThomas Zimmermann drm_err(dev, "fbdev: Failed to setup generic emulation (ret=%d)\n", ret);
2898ab59da2SThomas Zimmermann return ret;
2908ab59da2SThomas Zimmermann }
2918ab59da2SThomas Zimmermann
292b9c93f4eSThomas Zimmermann static const struct drm_client_funcs drm_fbdev_generic_client_funcs = {
2938ab59da2SThomas Zimmermann .owner = THIS_MODULE,
294b9c93f4eSThomas Zimmermann .unregister = drm_fbdev_generic_client_unregister,
295b9c93f4eSThomas Zimmermann .restore = drm_fbdev_generic_client_restore,
296b9c93f4eSThomas Zimmermann .hotplug = drm_fbdev_generic_client_hotplug,
2978ab59da2SThomas Zimmermann };
2988ab59da2SThomas Zimmermann
2998ab59da2SThomas Zimmermann /**
3008ab59da2SThomas Zimmermann * drm_fbdev_generic_setup() - Setup generic fbdev emulation
3018ab59da2SThomas Zimmermann * @dev: DRM device
3028ab59da2SThomas Zimmermann * @preferred_bpp: Preferred bits per pixel for the device.
3038ab59da2SThomas Zimmermann *
3048ab59da2SThomas Zimmermann * This function sets up generic fbdev emulation for drivers that supports
3058ab59da2SThomas Zimmermann * dumb buffers with a virtual address and that can be mmap'ed.
3068ab59da2SThomas Zimmermann * drm_fbdev_generic_setup() shall be called after the DRM driver registered
3078ab59da2SThomas Zimmermann * the new DRM device with drm_dev_register().
3088ab59da2SThomas Zimmermann *
3098ab59da2SThomas Zimmermann * Restore, hotplug events and teardown are all taken care of. Drivers that do
3108ab59da2SThomas Zimmermann * suspend/resume need to call drm_fb_helper_set_suspend_unlocked() themselves.
3118ab59da2SThomas Zimmermann * Simple drivers might use drm_mode_config_helper_suspend().
3128ab59da2SThomas Zimmermann *
313a5b44c4aSThomas Zimmermann * In order to provide fixed mmap-able memory ranges, generic fbdev emulation
314a5b44c4aSThomas Zimmermann * uses a shadow buffer in system memory. The implementation blits the shadow
315a5b44c4aSThomas Zimmermann * fbdev buffer onto the real buffer in regular intervals.
3168ab59da2SThomas Zimmermann *
3178ab59da2SThomas Zimmermann * This function is safe to call even when there are no connectors present.
3188ab59da2SThomas Zimmermann * Setup will be retried on the next hotplug event.
3198ab59da2SThomas Zimmermann *
3208ab59da2SThomas Zimmermann * The fbdev is destroyed by drm_dev_unregister().
3218ab59da2SThomas Zimmermann */
drm_fbdev_generic_setup(struct drm_device * dev,unsigned int preferred_bpp)322b9c93f4eSThomas Zimmermann void drm_fbdev_generic_setup(struct drm_device *dev, unsigned int preferred_bpp)
3238ab59da2SThomas Zimmermann {
3248ab59da2SThomas Zimmermann struct drm_fb_helper *fb_helper;
3258ab59da2SThomas Zimmermann int ret;
3268ab59da2SThomas Zimmermann
3278ab59da2SThomas Zimmermann drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
3288ab59da2SThomas Zimmermann drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
3298ab59da2SThomas Zimmermann
3308ab59da2SThomas Zimmermann fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
3318ab59da2SThomas Zimmermann if (!fb_helper)
3328ab59da2SThomas Zimmermann return;
333b9c93f4eSThomas Zimmermann drm_fb_helper_prepare(dev, fb_helper, preferred_bpp, &drm_fbdev_generic_helper_funcs);
3348ab59da2SThomas Zimmermann
335b9c93f4eSThomas Zimmermann ret = drm_client_init(dev, &fb_helper->client, "fbdev", &drm_fbdev_generic_client_funcs);
3368ab59da2SThomas Zimmermann if (ret) {
3378ab59da2SThomas Zimmermann drm_err(dev, "Failed to register client: %d\n", ret);
338f73ab51bSThomas Zimmermann goto err_drm_client_init;
3398ab59da2SThomas Zimmermann }
3408ab59da2SThomas Zimmermann
3418ab59da2SThomas Zimmermann drm_client_register(&fb_helper->client);
342f73ab51bSThomas Zimmermann
343f73ab51bSThomas Zimmermann return;
344f73ab51bSThomas Zimmermann
345f73ab51bSThomas Zimmermann err_drm_client_init:
346f73ab51bSThomas Zimmermann drm_fb_helper_unprepare(fb_helper);
347f73ab51bSThomas Zimmermann kfree(fb_helper);
348f73ab51bSThomas Zimmermann return;
3498ab59da2SThomas Zimmermann }
3508ab59da2SThomas Zimmermann EXPORT_SYMBOL(drm_fbdev_generic_setup);
351