Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/staging/imx-drm/imx-drm-core.c

  1 /*
  2  * Freescale i.MX drm driver
  3  *
  4  * Copyright (C) 2011 Sascha Hauer, Pengutronix
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version 2
  9  * of the License, or (at your option) any later version.
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  */
 16 #include <linux/component.h>
 17 #include <linux/device.h>
 18 #include <linux/fb.h>
 19 #include <linux/module.h>
 20 #include <linux/of_graph.h>
 21 #include <linux/platform_device.h>
 22 #include <drm/drmP.h>
 23 #include <drm/drm_fb_helper.h>
 24 #include <drm/drm_crtc_helper.h>
 25 #include <drm/drm_gem_cma_helper.h>
 26 #include <drm/drm_fb_cma_helper.h>
 27 
 28 #include "imx-drm.h"
 29 
 30 #define MAX_CRTC        4
 31 
 32 struct imx_drm_crtc;
 33 
 34 struct imx_drm_component {
 35         struct device_node *of_node;
 36         struct list_head list;
 37 };
 38 
 39 struct imx_drm_device {
 40         struct drm_device                       *drm;
 41         struct imx_drm_crtc                     *crtc[MAX_CRTC];
 42         int                                     pipes;
 43         struct drm_fbdev_cma                    *fbhelper;
 44 };
 45 
 46 struct imx_drm_crtc {
 47         struct drm_crtc                         *crtc;
 48         int                                     pipe;
 49         struct imx_drm_crtc_helper_funcs        imx_drm_helper_funcs;
 50         struct device_node                      *port;
 51 };
 52 
 53 static int legacyfb_depth = 16;
 54 module_param(legacyfb_depth, int, 0444);
 55 
 56 int imx_drm_crtc_id(struct imx_drm_crtc *crtc)
 57 {
 58         return crtc->pipe;
 59 }
 60 EXPORT_SYMBOL_GPL(imx_drm_crtc_id);
 61 
 62 static void imx_drm_driver_lastclose(struct drm_device *drm)
 63 {
 64 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
 65         struct imx_drm_device *imxdrm = drm->dev_private;
 66 
 67         if (imxdrm->fbhelper)
 68                 drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
 69 #endif
 70 }
 71 
 72 static int imx_drm_driver_unload(struct drm_device *drm)
 73 {
 74 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
 75         struct imx_drm_device *imxdrm = drm->dev_private;
 76 #endif
 77 
 78         drm_kms_helper_poll_fini(drm);
 79 
 80 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
 81         if (imxdrm->fbhelper)
 82                 drm_fbdev_cma_fini(imxdrm->fbhelper);
 83 #endif
 84 
 85         component_unbind_all(drm->dev, drm);
 86 
 87         drm_vblank_cleanup(drm);
 88         drm_mode_config_cleanup(drm);
 89 
 90         platform_set_drvdata(drm->platformdev, NULL);
 91 
 92         return 0;
 93 }
 94 
 95 static struct imx_drm_crtc *imx_drm_find_crtc(struct drm_crtc *crtc)
 96 {
 97         struct imx_drm_device *imxdrm = crtc->dev->dev_private;
 98         unsigned i;
 99 
100         for (i = 0; i < MAX_CRTC; i++)
101                 if (imxdrm->crtc[i] && imxdrm->crtc[i]->crtc == crtc)
102                         return imxdrm->crtc[i];
103 
104         return NULL;
105 }
106 
107 int imx_drm_panel_format_pins(struct drm_encoder *encoder,
108                 u32 interface_pix_fmt, int hsync_pin, int vsync_pin)
109 {
110         struct imx_drm_crtc_helper_funcs *helper;
111         struct imx_drm_crtc *imx_crtc;
112 
113         imx_crtc = imx_drm_find_crtc(encoder->crtc);
114         if (!imx_crtc)
115                 return -EINVAL;
116 
117         helper = &imx_crtc->imx_drm_helper_funcs;
118         if (helper->set_interface_pix_fmt)
119                 return helper->set_interface_pix_fmt(encoder->crtc,
120                                 encoder->encoder_type, interface_pix_fmt,
121                                 hsync_pin, vsync_pin);
122         return 0;
123 }
124 EXPORT_SYMBOL_GPL(imx_drm_panel_format_pins);
125 
126 int imx_drm_panel_format(struct drm_encoder *encoder, u32 interface_pix_fmt)
127 {
128         return imx_drm_panel_format_pins(encoder, interface_pix_fmt, 2, 3);
129 }
130 EXPORT_SYMBOL_GPL(imx_drm_panel_format);
131 
132 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
133 {
134         return drm_vblank_get(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
135 }
136 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
137 
138 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
139 {
140         drm_vblank_put(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
141 }
142 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
143 
144 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
145 {
146         drm_handle_vblank(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
147 }
148 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
149 
150 static int imx_drm_enable_vblank(struct drm_device *drm, int crtc)
151 {
152         struct imx_drm_device *imxdrm = drm->dev_private;
153         struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[crtc];
154         int ret;
155 
156         if (!imx_drm_crtc)
157                 return -EINVAL;
158 
159         if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
160                 return -ENOSYS;
161 
162         ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
163                         imx_drm_crtc->crtc);
164 
165         return ret;
166 }
167 
168 static void imx_drm_disable_vblank(struct drm_device *drm, int crtc)
169 {
170         struct imx_drm_device *imxdrm = drm->dev_private;
171         struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[crtc];
172 
173         if (!imx_drm_crtc)
174                 return;
175 
176         if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
177                 return;
178 
179         imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
180 }
181 
182 static void imx_drm_driver_preclose(struct drm_device *drm,
183                 struct drm_file *file)
184 {
185         int i;
186 
187         if (!file->is_master)
188                 return;
189 
190         for (i = 0; i < MAX_CRTC; i++)
191                 imx_drm_disable_vblank(drm, i);
192 }
193 
194 static const struct file_operations imx_drm_driver_fops = {
195         .owner = THIS_MODULE,
196         .open = drm_open,
197         .release = drm_release,
198         .unlocked_ioctl = drm_ioctl,
199         .mmap = drm_gem_cma_mmap,
200         .poll = drm_poll,
201         .read = drm_read,
202         .llseek = noop_llseek,
203 };
204 
205 void imx_drm_connector_destroy(struct drm_connector *connector)
206 {
207         drm_connector_unregister(connector);
208         drm_connector_cleanup(connector);
209 }
210 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
211 
212 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
213 {
214         drm_encoder_cleanup(encoder);
215 }
216 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
217 
218 static void imx_drm_output_poll_changed(struct drm_device *drm)
219 {
220 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
221         struct imx_drm_device *imxdrm = drm->dev_private;
222 
223         drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
224 #endif
225 }
226 
227 static struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
228         .fb_create = drm_fb_cma_create,
229         .output_poll_changed = imx_drm_output_poll_changed,
230 };
231 
232 /*
233  * Main DRM initialisation. This binds, initialises and registers
234  * with DRM the subcomponents of the driver.
235  */
236 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
237 {
238         struct imx_drm_device *imxdrm;
239         struct drm_connector *connector;
240         int ret;
241 
242         imxdrm = devm_kzalloc(drm->dev, sizeof(*imxdrm), GFP_KERNEL);
243         if (!imxdrm)
244                 return -ENOMEM;
245 
246         imxdrm->drm = drm;
247 
248         drm->dev_private = imxdrm;
249 
250         /*
251          * enable drm irq mode.
252          * - with irq_enabled = true, we can use the vblank feature.
253          *
254          * P.S. note that we wouldn't use drm irq handler but
255          *      just specific driver own one instead because
256          *      drm framework supports only one irq handler and
257          *      drivers can well take care of their interrupts
258          */
259         drm->irq_enabled = true;
260 
261         /*
262          * set max width and height as default value(4096x4096).
263          * this value would be used to check framebuffer size limitation
264          * at drm_mode_addfb().
265          */
266         drm->mode_config.min_width = 64;
267         drm->mode_config.min_height = 64;
268         drm->mode_config.max_width = 4096;
269         drm->mode_config.max_height = 4096;
270         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
271 
272         drm_mode_config_init(drm);
273 
274         ret = drm_vblank_init(drm, MAX_CRTC);
275         if (ret)
276                 goto err_kms;
277 
278         /*
279          * with vblank_disable_allowed = true, vblank interrupt will be
280          * disabled by drm timer once a current process gives up ownership
281          * of vblank event. (after drm_vblank_put function is called)
282          */
283         drm->vblank_disable_allowed = true;
284 
285         platform_set_drvdata(drm->platformdev, drm);
286 
287         /* Now try and bind all our sub-components */
288         ret = component_bind_all(drm->dev, drm);
289         if (ret)
290                 goto err_vblank;
291 
292         /*
293          * All components are now added, we can publish the connector sysfs
294          * entries to userspace.  This will generate hotplug events and so
295          * userspace will expect to be able to access DRM at this point.
296          */
297         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
298                 ret = drm_connector_register(connector);
299                 if (ret) {
300                         dev_err(drm->dev,
301                                 "[CONNECTOR:%d:%s] drm_connector_register failed: %d\n",
302                                 connector->base.id,
303                                 connector->name, ret);
304                         goto err_unbind;
305                 }
306         }
307 
308         /*
309          * All components are now initialised, so setup the fb helper.
310          * The fb helper takes copies of key hardware information, so the
311          * crtcs/connectors/encoders must not change after this point.
312          */
313 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
314         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
315                 dev_warn(drm->dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
316                 legacyfb_depth = 16;
317         }
318         imxdrm->fbhelper = drm_fbdev_cma_init(drm, legacyfb_depth,
319                                 drm->mode_config.num_crtc, MAX_CRTC);
320         if (IS_ERR(imxdrm->fbhelper)) {
321                 ret = PTR_ERR(imxdrm->fbhelper);
322                 imxdrm->fbhelper = NULL;
323                 goto err_unbind;
324         }
325 #endif
326 
327         drm_kms_helper_poll_init(drm);
328 
329         return 0;
330 
331 err_unbind:
332         component_unbind_all(drm->dev, drm);
333 err_vblank:
334         drm_vblank_cleanup(drm);
335 err_kms:
336         drm_mode_config_cleanup(drm);
337 
338         return ret;
339 }
340 
341 /*
342  * imx_drm_add_crtc - add a new crtc
343  */
344 int imx_drm_add_crtc(struct drm_device *drm, struct drm_crtc *crtc,
345                 struct imx_drm_crtc **new_crtc,
346                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
347                 struct device_node *port)
348 {
349         struct imx_drm_device *imxdrm = drm->dev_private;
350         struct imx_drm_crtc *imx_drm_crtc;
351         int ret;
352 
353         /*
354          * The vblank arrays are dimensioned by MAX_CRTC - we can't
355          * pass IDs greater than this to those functions.
356          */
357         if (imxdrm->pipes >= MAX_CRTC)
358                 return -EINVAL;
359 
360         if (imxdrm->drm->open_count)
361                 return -EBUSY;
362 
363         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
364         if (!imx_drm_crtc)
365                 return -ENOMEM;
366 
367         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
368         imx_drm_crtc->pipe = imxdrm->pipes++;
369         imx_drm_crtc->port = port;
370         imx_drm_crtc->crtc = crtc;
371 
372         imxdrm->crtc[imx_drm_crtc->pipe] = imx_drm_crtc;
373 
374         *new_crtc = imx_drm_crtc;
375 
376         ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
377         if (ret)
378                 goto err_register;
379 
380         drm_crtc_helper_add(crtc,
381                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
382 
383         drm_crtc_init(drm, crtc,
384                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
385 
386         return 0;
387 
388 err_register:
389         imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
390         kfree(imx_drm_crtc);
391         return ret;
392 }
393 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
394 
395 /*
396  * imx_drm_remove_crtc - remove a crtc
397  */
398 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
399 {
400         struct imx_drm_device *imxdrm = imx_drm_crtc->crtc->dev->dev_private;
401 
402         drm_crtc_cleanup(imx_drm_crtc->crtc);
403 
404         imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
405 
406         kfree(imx_drm_crtc);
407 
408         return 0;
409 }
410 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
411 
412 /*
413  * Find the DRM CRTC possible mask for the connected endpoint.
414  *
415  * The encoder possible masks are defined by their position in the
416  * mode_config crtc_list.  This means that CRTCs must not be added
417  * or removed once the DRM device has been fully initialised.
418  */
419 static uint32_t imx_drm_find_crtc_mask(struct imx_drm_device *imxdrm,
420         struct device_node *endpoint)
421 {
422         struct device_node *port;
423         unsigned i;
424 
425         port = of_graph_get_remote_port(endpoint);
426         if (!port)
427                 return 0;
428         of_node_put(port);
429 
430         for (i = 0; i < MAX_CRTC; i++) {
431                 struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[i];
432 
433                 if (imx_drm_crtc && imx_drm_crtc->port == port)
434                         return drm_crtc_mask(imx_drm_crtc->crtc);
435         }
436 
437         return 0;
438 }
439 
440 static struct device_node *imx_drm_of_get_next_endpoint(
441                 const struct device_node *parent, struct device_node *prev)
442 {
443         struct device_node *node = of_graph_get_next_endpoint(parent, prev);
444 
445         of_node_put(prev);
446         return node;
447 }
448 
449 int imx_drm_encoder_parse_of(struct drm_device *drm,
450         struct drm_encoder *encoder, struct device_node *np)
451 {
452         struct imx_drm_device *imxdrm = drm->dev_private;
453         struct device_node *ep = NULL;
454         uint32_t crtc_mask = 0;
455         int i;
456 
457         for (i = 0; ; i++) {
458                 u32 mask;
459 
460                 ep = imx_drm_of_get_next_endpoint(np, ep);
461                 if (!ep)
462                         break;
463 
464                 mask = imx_drm_find_crtc_mask(imxdrm, ep);
465 
466                 /*
467                  * If we failed to find the CRTC(s) which this encoder is
468                  * supposed to be connected to, it's because the CRTC has
469                  * not been registered yet.  Defer probing, and hope that
470                  * the required CRTC is added later.
471                  */
472                 if (mask == 0)
473                         return -EPROBE_DEFER;
474 
475                 crtc_mask |= mask;
476         }
477 
478         of_node_put(ep);
479         if (i == 0)
480                 return -ENOENT;
481 
482         encoder->possible_crtcs = crtc_mask;
483 
484         /* FIXME: this is the mask of outputs which can clone this output. */
485         encoder->possible_clones = ~0;
486 
487         return 0;
488 }
489 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
490 
491 /*
492  * @node: device tree node containing encoder input ports
493  * @encoder: drm_encoder
494  */
495 int imx_drm_encoder_get_mux_id(struct device_node *node,
496                                struct drm_encoder *encoder)
497 {
498         struct imx_drm_crtc *imx_crtc = imx_drm_find_crtc(encoder->crtc);
499         struct device_node *ep = NULL;
500         struct of_endpoint endpoint;
501         struct device_node *port;
502         int ret;
503 
504         if (!node || !imx_crtc)
505                 return -EINVAL;
506 
507         do {
508                 ep = imx_drm_of_get_next_endpoint(node, ep);
509                 if (!ep)
510                         break;
511 
512                 port = of_graph_get_remote_port(ep);
513                 of_node_put(port);
514                 if (port == imx_crtc->port) {
515                         ret = of_graph_parse_endpoint(ep, &endpoint);
516                         return ret ? ret : endpoint.port;
517                 }
518         } while (ep);
519 
520         return -EINVAL;
521 }
522 EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
523 
524 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
525         /* none so far */
526 };
527 
528 static struct drm_driver imx_drm_driver = {
529         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
530         .load                   = imx_drm_driver_load,
531         .unload                 = imx_drm_driver_unload,
532         .lastclose              = imx_drm_driver_lastclose,
533         .preclose               = imx_drm_driver_preclose,
534         .set_busid              = drm_platform_set_busid,
535         .gem_free_object        = drm_gem_cma_free_object,
536         .gem_vm_ops             = &drm_gem_cma_vm_ops,
537         .dumb_create            = drm_gem_cma_dumb_create,
538         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
539         .dumb_destroy           = drm_gem_dumb_destroy,
540 
541         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
542         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
543         .gem_prime_import       = drm_gem_prime_import,
544         .gem_prime_export       = drm_gem_prime_export,
545         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
546         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
547         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
548         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
549         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
550         .get_vblank_counter     = drm_vblank_count,
551         .enable_vblank          = imx_drm_enable_vblank,
552         .disable_vblank         = imx_drm_disable_vblank,
553         .ioctls                 = imx_drm_ioctls,
554         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
555         .fops                   = &imx_drm_driver_fops,
556         .name                   = "imx-drm",
557         .desc                   = "i.MX DRM graphics",
558         .date                   = "20120507",
559         .major                  = 1,
560         .minor                  = 0,
561         .patchlevel             = 0,
562 };
563 
564 static int compare_of(struct device *dev, void *data)
565 {
566         struct device_node *np = data;
567 
568         /* Special case for LDB, one device for two channels */
569         if (of_node_cmp(np->name, "lvds-channel") == 0) {
570                 np = of_get_parent(np);
571                 of_node_put(np);
572         }
573 
574         return dev->of_node == np;
575 }
576 
577 static int imx_drm_bind(struct device *dev)
578 {
579         return drm_platform_init(&imx_drm_driver, to_platform_device(dev));
580 }
581 
582 static void imx_drm_unbind(struct device *dev)
583 {
584         drm_put_dev(dev_get_drvdata(dev));
585 }
586 
587 static const struct component_master_ops imx_drm_ops = {
588         .bind = imx_drm_bind,
589         .unbind = imx_drm_unbind,
590 };
591 
592 static int imx_drm_platform_probe(struct platform_device *pdev)
593 {
594         struct device_node *ep, *port, *remote;
595         struct component_match *match = NULL;
596         int ret;
597         int i;
598 
599         /*
600          * Bind the IPU display interface ports first, so that
601          * imx_drm_encoder_parse_of called from encoder .bind callbacks
602          * works as expected.
603          */
604         for (i = 0; ; i++) {
605                 port = of_parse_phandle(pdev->dev.of_node, "ports", i);
606                 if (!port)
607                         break;
608 
609                 component_match_add(&pdev->dev, &match, compare_of, port);
610         }
611 
612         if (i == 0) {
613                 dev_err(&pdev->dev, "missing 'ports' property\n");
614                 return -ENODEV;
615         }
616 
617         /* Then bind all encoders */
618         for (i = 0; ; i++) {
619                 port = of_parse_phandle(pdev->dev.of_node, "ports", i);
620                 if (!port)
621                         break;
622 
623                 for_each_child_of_node(port, ep) {
624                         remote = of_graph_get_remote_port_parent(ep);
625                         if (!remote || !of_device_is_available(remote)) {
626                                 of_node_put(remote);
627                                 continue;
628                         } else if (!of_device_is_available(remote->parent)) {
629                                 dev_warn(&pdev->dev, "parent device of %s is not available\n",
630                                          remote->full_name);
631                                 of_node_put(remote);
632                                 continue;
633                         }
634 
635                         component_match_add(&pdev->dev, &match, compare_of, remote);
636                         of_node_put(remote);
637                 }
638                 of_node_put(port);
639         }
640 
641         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
642         if (ret)
643                 return ret;
644 
645         return component_master_add_with_match(&pdev->dev, &imx_drm_ops, match);
646 }
647 
648 static int imx_drm_platform_remove(struct platform_device *pdev)
649 {
650         component_master_del(&pdev->dev, &imx_drm_ops);
651         return 0;
652 }
653 
654 #ifdef CONFIG_PM_SLEEP
655 static int imx_drm_suspend(struct device *dev)
656 {
657         struct drm_device *drm_dev = dev_get_drvdata(dev);
658 
659         /* The drm_dev is NULL before .load hook is called */
660         if (drm_dev == NULL)
661                 return 0;
662 
663         drm_kms_helper_poll_disable(drm_dev);
664 
665         return 0;
666 }
667 
668 static int imx_drm_resume(struct device *dev)
669 {
670         struct drm_device *drm_dev = dev_get_drvdata(dev);
671 
672         if (drm_dev == NULL)
673                 return 0;
674 
675         drm_helper_resume_force_mode(drm_dev);
676         drm_kms_helper_poll_enable(drm_dev);
677 
678         return 0;
679 }
680 #endif
681 
682 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
683 
684 static const struct of_device_id imx_drm_dt_ids[] = {
685         { .compatible = "fsl,imx-display-subsystem", },
686         { /* sentinel */ },
687 };
688 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
689 
690 static struct platform_driver imx_drm_pdrv = {
691         .probe          = imx_drm_platform_probe,
692         .remove         = imx_drm_platform_remove,
693         .driver         = {
694                 .owner  = THIS_MODULE,
695                 .name   = "imx-drm",
696                 .pm     = &imx_drm_pm_ops,
697                 .of_match_table = imx_drm_dt_ids,
698         },
699 };
700 module_platform_driver(imx_drm_pdrv);
701 
702 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
703 MODULE_DESCRIPTION("i.MX drm driver core");
704 MODULE_LICENSE("GPL");
705 

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