Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 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

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         return 0;
 91 }
 92 
 93 static struct imx_drm_crtc *imx_drm_find_crtc(struct drm_crtc *crtc)
 94 {
 95         struct imx_drm_device *imxdrm = crtc->dev->dev_private;
 96         unsigned i;
 97 
 98         for (i = 0; i < MAX_CRTC; i++)
 99                 if (imxdrm->crtc[i] && imxdrm->crtc[i]->crtc == crtc)
100                         return imxdrm->crtc[i];
101 
102         return NULL;
103 }
104 
105 int imx_drm_panel_format_pins(struct drm_encoder *encoder,
106                 u32 interface_pix_fmt, int hsync_pin, int vsync_pin)
107 {
108         struct imx_drm_crtc_helper_funcs *helper;
109         struct imx_drm_crtc *imx_crtc;
110 
111         imx_crtc = imx_drm_find_crtc(encoder->crtc);
112         if (!imx_crtc)
113                 return -EINVAL;
114 
115         helper = &imx_crtc->imx_drm_helper_funcs;
116         if (helper->set_interface_pix_fmt)
117                 return helper->set_interface_pix_fmt(encoder->crtc,
118                                 encoder->encoder_type, interface_pix_fmt,
119                                 hsync_pin, vsync_pin);
120         return 0;
121 }
122 EXPORT_SYMBOL_GPL(imx_drm_panel_format_pins);
123 
124 int imx_drm_panel_format(struct drm_encoder *encoder, u32 interface_pix_fmt)
125 {
126         return imx_drm_panel_format_pins(encoder, interface_pix_fmt, 2, 3);
127 }
128 EXPORT_SYMBOL_GPL(imx_drm_panel_format);
129 
130 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
131 {
132         return drm_vblank_get(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
133 }
134 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
135 
136 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
137 {
138         drm_vblank_put(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
139 }
140 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
141 
142 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
143 {
144         drm_handle_vblank(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
145 }
146 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
147 
148 static int imx_drm_enable_vblank(struct drm_device *drm, int crtc)
149 {
150         struct imx_drm_device *imxdrm = drm->dev_private;
151         struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[crtc];
152         int ret;
153 
154         if (!imx_drm_crtc)
155                 return -EINVAL;
156 
157         if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
158                 return -ENOSYS;
159 
160         ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
161                         imx_drm_crtc->crtc);
162 
163         return ret;
164 }
165 
166 static void imx_drm_disable_vblank(struct drm_device *drm, int crtc)
167 {
168         struct imx_drm_device *imxdrm = drm->dev_private;
169         struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[crtc];
170 
171         if (!imx_drm_crtc)
172                 return;
173 
174         if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
175                 return;
176 
177         imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
178 }
179 
180 static void imx_drm_driver_preclose(struct drm_device *drm,
181                 struct drm_file *file)
182 {
183         int i;
184 
185         if (!file->is_master)
186                 return;
187 
188         for (i = 0; i < MAX_CRTC; i++)
189                 imx_drm_disable_vblank(drm, i);
190 }
191 
192 static const struct file_operations imx_drm_driver_fops = {
193         .owner = THIS_MODULE,
194         .open = drm_open,
195         .release = drm_release,
196         .unlocked_ioctl = drm_ioctl,
197         .mmap = drm_gem_cma_mmap,
198         .poll = drm_poll,
199         .read = drm_read,
200         .llseek = noop_llseek,
201 };
202 
203 void imx_drm_connector_destroy(struct drm_connector *connector)
204 {
205         drm_sysfs_connector_remove(connector);
206         drm_connector_cleanup(connector);
207 }
208 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
209 
210 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
211 {
212         drm_encoder_cleanup(encoder);
213 }
214 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
215 
216 static void imx_drm_output_poll_changed(struct drm_device *drm)
217 {
218 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
219         struct imx_drm_device *imxdrm = drm->dev_private;
220 
221         drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
222 #endif
223 }
224 
225 static struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
226         .fb_create = drm_fb_cma_create,
227         .output_poll_changed = imx_drm_output_poll_changed,
228 };
229 
230 /*
231  * Main DRM initialisation. This binds, initialises and registers
232  * with DRM the subcomponents of the driver.
233  */
234 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
235 {
236         struct imx_drm_device *imxdrm;
237         struct drm_connector *connector;
238         int ret;
239 
240         imxdrm = devm_kzalloc(drm->dev, sizeof(*imxdrm), GFP_KERNEL);
241         if (!imxdrm)
242                 return -ENOMEM;
243 
244         imxdrm->drm = drm;
245 
246         drm->dev_private = imxdrm;
247 
248         /*
249          * enable drm irq mode.
250          * - with irq_enabled = true, we can use the vblank feature.
251          *
252          * P.S. note that we wouldn't use drm irq handler but
253          *      just specific driver own one instead because
254          *      drm framework supports only one irq handler and
255          *      drivers can well take care of their interrupts
256          */
257         drm->irq_enabled = true;
258 
259         /*
260          * set max width and height as default value(4096x4096).
261          * this value would be used to check framebuffer size limitation
262          * at drm_mode_addfb().
263          */
264         drm->mode_config.min_width = 64;
265         drm->mode_config.min_height = 64;
266         drm->mode_config.max_width = 4096;
267         drm->mode_config.max_height = 4096;
268         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
269 
270         drm_mode_config_init(drm);
271 
272         ret = drm_vblank_init(drm, MAX_CRTC);
273         if (ret)
274                 goto err_kms;
275 
276         /*
277          * with vblank_disable_allowed = true, vblank interrupt will be
278          * disabled by drm timer once a current process gives up ownership
279          * of vblank event. (after drm_vblank_put function is called)
280          */
281         drm->vblank_disable_allowed = true;
282 
283         platform_set_drvdata(drm->platformdev, drm);
284 
285         /* Now try and bind all our sub-components */
286         ret = component_bind_all(drm->dev, drm);
287         if (ret)
288                 goto err_vblank;
289 
290         /*
291          * All components are now added, we can publish the connector sysfs
292          * entries to userspace.  This will generate hotplug events and so
293          * userspace will expect to be able to access DRM at this point.
294          */
295         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
296                 ret = drm_sysfs_connector_add(connector);
297                 if (ret) {
298                         dev_err(drm->dev,
299                                 "[CONNECTOR:%d:%s] drm_sysfs_connector_add failed: %d\n",
300                                 connector->base.id,
301                                 connector->name, ret);
302                         goto err_unbind;
303                 }
304         }
305 
306         /*
307          * All components are now initialised, so setup the fb helper.
308          * The fb helper takes copies of key hardware information, so the
309          * crtcs/connectors/encoders must not change after this point.
310          */
311 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
312         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
313                 dev_warn(drm->dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
314                 legacyfb_depth = 16;
315         }
316         imxdrm->fbhelper = drm_fbdev_cma_init(drm, legacyfb_depth,
317                                 drm->mode_config.num_crtc, MAX_CRTC);
318         if (IS_ERR(imxdrm->fbhelper)) {
319                 ret = PTR_ERR(imxdrm->fbhelper);
320                 imxdrm->fbhelper = NULL;
321                 goto err_unbind;
322         }
323 #endif
324 
325         drm_kms_helper_poll_init(drm);
326 
327         return 0;
328 
329 err_unbind:
330         component_unbind_all(drm->dev, drm);
331 err_vblank:
332         drm_vblank_cleanup(drm);
333 err_kms:
334         drm_mode_config_cleanup(drm);
335 
336         return ret;
337 }
338 
339 /*
340  * imx_drm_add_crtc - add a new crtc
341  */
342 int imx_drm_add_crtc(struct drm_device *drm, struct drm_crtc *crtc,
343                 struct imx_drm_crtc **new_crtc,
344                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
345                 struct device_node *port)
346 {
347         struct imx_drm_device *imxdrm = drm->dev_private;
348         struct imx_drm_crtc *imx_drm_crtc;
349         int ret;
350 
351         /*
352          * The vblank arrays are dimensioned by MAX_CRTC - we can't
353          * pass IDs greater than this to those functions.
354          */
355         if (imxdrm->pipes >= MAX_CRTC)
356                 return -EINVAL;
357 
358         if (imxdrm->drm->open_count)
359                 return -EBUSY;
360 
361         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
362         if (!imx_drm_crtc)
363                 return -ENOMEM;
364 
365         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
366         imx_drm_crtc->pipe = imxdrm->pipes++;
367         imx_drm_crtc->port = port;
368         imx_drm_crtc->crtc = crtc;
369 
370         imxdrm->crtc[imx_drm_crtc->pipe] = imx_drm_crtc;
371 
372         *new_crtc = imx_drm_crtc;
373 
374         ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
375         if (ret)
376                 goto err_register;
377 
378         drm_crtc_helper_add(crtc,
379                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
380 
381         drm_crtc_init(drm, crtc,
382                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
383 
384         return 0;
385 
386 err_register:
387         imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
388         kfree(imx_drm_crtc);
389         return ret;
390 }
391 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
392 
393 /*
394  * imx_drm_remove_crtc - remove a crtc
395  */
396 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
397 {
398         struct imx_drm_device *imxdrm = imx_drm_crtc->crtc->dev->dev_private;
399 
400         drm_crtc_cleanup(imx_drm_crtc->crtc);
401 
402         imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
403 
404         kfree(imx_drm_crtc);
405 
406         return 0;
407 }
408 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
409 
410 /*
411  * Find the DRM CRTC possible mask for the connected endpoint.
412  *
413  * The encoder possible masks are defined by their position in the
414  * mode_config crtc_list.  This means that CRTCs must not be added
415  * or removed once the DRM device has been fully initialised.
416  */
417 static uint32_t imx_drm_find_crtc_mask(struct imx_drm_device *imxdrm,
418         struct device_node *endpoint)
419 {
420         struct device_node *port;
421         unsigned i;
422 
423         port = of_graph_get_remote_port(endpoint);
424         if (!port)
425                 return 0;
426         of_node_put(port);
427 
428         for (i = 0; i < MAX_CRTC; i++) {
429                 struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[i];
430                 if (imx_drm_crtc && imx_drm_crtc->port == port)
431                         return drm_crtc_mask(imx_drm_crtc->crtc);
432         }
433 
434         return 0;
435 }
436 
437 static struct device_node *imx_drm_of_get_next_endpoint(
438                 const struct device_node *parent, struct device_node *prev)
439 {
440         struct device_node *node = of_graph_get_next_endpoint(parent, prev);
441         of_node_put(prev);
442         return node;
443 }
444 
445 int imx_drm_encoder_parse_of(struct drm_device *drm,
446         struct drm_encoder *encoder, struct device_node *np)
447 {
448         struct imx_drm_device *imxdrm = drm->dev_private;
449         struct device_node *ep = NULL;
450         uint32_t crtc_mask = 0;
451         int i;
452 
453         for (i = 0; ; i++) {
454                 u32 mask;
455 
456                 ep = imx_drm_of_get_next_endpoint(np, ep);
457                 if (!ep)
458                         break;
459 
460                 mask = imx_drm_find_crtc_mask(imxdrm, ep);
461 
462                 /*
463                  * If we failed to find the CRTC(s) which this encoder is
464                  * supposed to be connected to, it's because the CRTC has
465                  * not been registered yet.  Defer probing, and hope that
466                  * the required CRTC is added later.
467                  */
468                 if (mask == 0)
469                         return -EPROBE_DEFER;
470 
471                 crtc_mask |= mask;
472         }
473 
474         if (ep)
475                 of_node_put(ep);
476         if (i == 0)
477                 return -ENOENT;
478 
479         encoder->possible_crtcs = crtc_mask;
480 
481         /* FIXME: this is the mask of outputs which can clone this output. */
482         encoder->possible_clones = ~0;
483 
484         return 0;
485 }
486 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
487 
488 /*
489  * @node: device tree node containing encoder input ports
490  * @encoder: drm_encoder
491  */
492 int imx_drm_encoder_get_mux_id(struct device_node *node,
493                                struct drm_encoder *encoder)
494 {
495         struct imx_drm_crtc *imx_crtc = imx_drm_find_crtc(encoder->crtc);
496         struct device_node *ep = NULL;
497         struct of_endpoint endpoint;
498         struct device_node *port;
499         int ret;
500 
501         if (!node || !imx_crtc)
502                 return -EINVAL;
503 
504         do {
505                 ep = imx_drm_of_get_next_endpoint(node, ep);
506                 if (!ep)
507                         break;
508 
509                 port = of_graph_get_remote_port(ep);
510                 of_node_put(port);
511                 if (port == imx_crtc->port) {
512                         ret = of_graph_parse_endpoint(ep, &endpoint);
513                         return ret ? ret : endpoint.port;
514                 }
515         } while (ep);
516 
517         return -EINVAL;
518 }
519 EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
520 
521 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
522         /* none so far */
523 };
524 
525 static struct drm_driver imx_drm_driver = {
526         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
527         .load                   = imx_drm_driver_load,
528         .unload                 = imx_drm_driver_unload,
529         .lastclose              = imx_drm_driver_lastclose,
530         .preclose               = imx_drm_driver_preclose,
531         .gem_free_object        = drm_gem_cma_free_object,
532         .gem_vm_ops             = &drm_gem_cma_vm_ops,
533         .dumb_create            = drm_gem_cma_dumb_create,
534         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
535         .dumb_destroy           = drm_gem_dumb_destroy,
536 
537         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
538         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
539         .gem_prime_import       = drm_gem_prime_import,
540         .gem_prime_export       = drm_gem_prime_export,
541         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
542         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
543         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
544         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
545         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
546         .get_vblank_counter     = drm_vblank_count,
547         .enable_vblank          = imx_drm_enable_vblank,
548         .disable_vblank         = imx_drm_disable_vblank,
549         .ioctls                 = imx_drm_ioctls,
550         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
551         .fops                   = &imx_drm_driver_fops,
552         .name                   = "imx-drm",
553         .desc                   = "i.MX DRM graphics",
554         .date                   = "20120507",
555         .major                  = 1,
556         .minor                  = 0,
557         .patchlevel             = 0,
558 };
559 
560 static int compare_of(struct device *dev, void *data)
561 {
562         struct device_node *np = data;
563 
564         /* Special case for LDB, one device for two channels */
565         if (of_node_cmp(np->name, "lvds-channel") == 0) {
566                 np = of_get_parent(np);
567                 of_node_put(np);
568         }
569 
570         return dev->of_node == np;
571 }
572 
573 static LIST_HEAD(imx_drm_components);
574 
575 static int imx_drm_add_components(struct device *master, struct master *m)
576 {
577         struct imx_drm_component *component;
578         int ret;
579 
580         list_for_each_entry(component, &imx_drm_components, list) {
581                 ret = component_master_add_child(m, compare_of,
582                                                  component->of_node);
583                 if (ret)
584                         return ret;
585         }
586         return 0;
587 }
588 
589 static int imx_drm_bind(struct device *dev)
590 {
591         return drm_platform_init(&imx_drm_driver, to_platform_device(dev));
592 }
593 
594 static void imx_drm_unbind(struct device *dev)
595 {
596         drm_put_dev(dev_get_drvdata(dev));
597 }
598 
599 static const struct component_master_ops imx_drm_ops = {
600         .add_components = imx_drm_add_components,
601         .bind = imx_drm_bind,
602         .unbind = imx_drm_unbind,
603 };
604 
605 static struct imx_drm_component *imx_drm_find_component(struct device *dev,
606                 struct device_node *node)
607 {
608         struct imx_drm_component *component;
609 
610         list_for_each_entry(component, &imx_drm_components, list)
611                 if (component->of_node == node)
612                         return component;
613 
614         return NULL;
615 }
616 
617 static int imx_drm_add_component(struct device *dev, struct device_node *node)
618 {
619         struct imx_drm_component *component;
620 
621         if (imx_drm_find_component(dev, node))
622                 return 0;
623 
624         component = devm_kzalloc(dev, sizeof(*component), GFP_KERNEL);
625         if (!component)
626                 return -ENOMEM;
627 
628         component->of_node = node;
629         list_add_tail(&component->list, &imx_drm_components);
630 
631         return 0;
632 }
633 
634 static int imx_drm_platform_probe(struct platform_device *pdev)
635 {
636         struct device_node *ep, *port, *remote;
637         int ret;
638         int i;
639 
640         /*
641          * Bind the IPU display interface ports first, so that
642          * imx_drm_encoder_parse_of called from encoder .bind callbacks
643          * works as expected.
644          */
645         for (i = 0; ; i++) {
646                 port = of_parse_phandle(pdev->dev.of_node, "ports", i);
647                 if (!port)
648                         break;
649 
650                 ret = imx_drm_add_component(&pdev->dev, port);
651                 if (ret < 0)
652                         return ret;
653         }
654 
655         if (i == 0) {
656                 dev_err(&pdev->dev, "missing 'ports' property\n");
657                 return -ENODEV;
658         }
659 
660         /* Then bind all encoders */
661         for (i = 0; ; i++) {
662                 port = of_parse_phandle(pdev->dev.of_node, "ports", i);
663                 if (!port)
664                         break;
665 
666                 for_each_child_of_node(port, ep) {
667                         remote = of_graph_get_remote_port_parent(ep);
668                         if (!remote || !of_device_is_available(remote)) {
669                                 of_node_put(remote);
670                                 continue;
671                         } else if (!of_device_is_available(remote->parent)) {
672                                 dev_warn(&pdev->dev, "parent device of %s is not available\n",
673                                          remote->full_name);
674                                 of_node_put(remote);
675                                 continue;
676                         }
677 
678                         ret = imx_drm_add_component(&pdev->dev, remote);
679                         of_node_put(remote);
680                         if (ret < 0)
681                                 return ret;
682                 }
683                 of_node_put(port);
684         }
685 
686         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
687         if (ret)
688                 return ret;
689 
690         return component_master_add(&pdev->dev, &imx_drm_ops);
691 }
692 
693 static int imx_drm_platform_remove(struct platform_device *pdev)
694 {
695         component_master_del(&pdev->dev, &imx_drm_ops);
696         return 0;
697 }
698 
699 static const struct of_device_id imx_drm_dt_ids[] = {
700         { .compatible = "fsl,imx-display-subsystem", },
701         { /* sentinel */ },
702 };
703 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
704 
705 static struct platform_driver imx_drm_pdrv = {
706         .probe          = imx_drm_platform_probe,
707         .remove         = imx_drm_platform_remove,
708         .driver         = {
709                 .owner  = THIS_MODULE,
710                 .name   = "imx-drm",
711                 .of_match_table = imx_drm_dt_ids,
712         },
713 };
714 module_platform_driver(imx_drm_pdrv);
715 
716 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
717 MODULE_DESCRIPTION("i.MX drm driver core");
718 MODULE_LICENSE("GPL");
719 

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