Version:  2.0.40 2.2.26 2.4.37 2.6.39 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

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 int imx_drm_connector_mode_valid(struct drm_connector *connector,
204         struct drm_display_mode *mode)
205 {
206         return MODE_OK;
207 }
208 EXPORT_SYMBOL(imx_drm_connector_mode_valid);
209 
210 void imx_drm_connector_destroy(struct drm_connector *connector)
211 {
212         drm_sysfs_connector_remove(connector);
213         drm_connector_cleanup(connector);
214 }
215 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
216 
217 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
218 {
219         drm_encoder_cleanup(encoder);
220 }
221 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
222 
223 static void imx_drm_output_poll_changed(struct drm_device *drm)
224 {
225 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
226         struct imx_drm_device *imxdrm = drm->dev_private;
227 
228         drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
229 #endif
230 }
231 
232 static struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
233         .fb_create = drm_fb_cma_create,
234         .output_poll_changed = imx_drm_output_poll_changed,
235 };
236 
237 /*
238  * Main DRM initialisation. This binds, initialises and registers
239  * with DRM the subcomponents of the driver.
240  */
241 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
242 {
243         struct imx_drm_device *imxdrm;
244         struct drm_connector *connector;
245         int ret;
246 
247         imxdrm = devm_kzalloc(drm->dev, sizeof(*imxdrm), GFP_KERNEL);
248         if (!imxdrm)
249                 return -ENOMEM;
250 
251         imxdrm->drm = drm;
252 
253         drm->dev_private = imxdrm;
254 
255         /*
256          * enable drm irq mode.
257          * - with irq_enabled = true, we can use the vblank feature.
258          *
259          * P.S. note that we wouldn't use drm irq handler but
260          *      just specific driver own one instead because
261          *      drm framework supports only one irq handler and
262          *      drivers can well take care of their interrupts
263          */
264         drm->irq_enabled = true;
265 
266         /*
267          * set max width and height as default value(4096x4096).
268          * this value would be used to check framebuffer size limitation
269          * at drm_mode_addfb().
270          */
271         drm->mode_config.min_width = 64;
272         drm->mode_config.min_height = 64;
273         drm->mode_config.max_width = 4096;
274         drm->mode_config.max_height = 4096;
275         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
276 
277         drm_mode_config_init(drm);
278 
279         ret = drm_vblank_init(drm, MAX_CRTC);
280         if (ret)
281                 goto err_kms;
282 
283         /*
284          * with vblank_disable_allowed = true, vblank interrupt will be
285          * disabled by drm timer once a current process gives up ownership
286          * of vblank event. (after drm_vblank_put function is called)
287          */
288         drm->vblank_disable_allowed = true;
289 
290         platform_set_drvdata(drm->platformdev, drm);
291 
292         /* Now try and bind all our sub-components */
293         ret = component_bind_all(drm->dev, drm);
294         if (ret)
295                 goto err_vblank;
296 
297         /*
298          * All components are now added, we can publish the connector sysfs
299          * entries to userspace.  This will generate hotplug events and so
300          * userspace will expect to be able to access DRM at this point.
301          */
302         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
303                 ret = drm_sysfs_connector_add(connector);
304                 if (ret) {
305                         dev_err(drm->dev,
306                                 "[CONNECTOR:%d:%s] drm_sysfs_connector_add failed: %d\n",
307                                 connector->base.id,
308                                 drm_get_connector_name(connector), ret);
309                         goto err_unbind;
310                 }
311         }
312 
313         /*
314          * All components are now initialised, so setup the fb helper.
315          * The fb helper takes copies of key hardware information, so the
316          * crtcs/connectors/encoders must not change after this point.
317          */
318 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
319         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
320                 dev_warn(drm->dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
321                 legacyfb_depth = 16;
322         }
323         imxdrm->fbhelper = drm_fbdev_cma_init(drm, legacyfb_depth,
324                                 drm->mode_config.num_crtc, MAX_CRTC);
325         if (IS_ERR(imxdrm->fbhelper)) {
326                 ret = PTR_ERR(imxdrm->fbhelper);
327                 imxdrm->fbhelper = NULL;
328                 goto err_unbind;
329         }
330 #endif
331 
332         drm_kms_helper_poll_init(drm);
333 
334         return 0;
335 
336 err_unbind:
337         component_unbind_all(drm->dev, drm);
338 err_vblank:
339         drm_vblank_cleanup(drm);
340 err_kms:
341         drm_mode_config_cleanup(drm);
342 
343         return ret;
344 }
345 
346 /*
347  * imx_drm_add_crtc - add a new crtc
348  */
349 int imx_drm_add_crtc(struct drm_device *drm, struct drm_crtc *crtc,
350                 struct imx_drm_crtc **new_crtc,
351                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
352                 struct device_node *port)
353 {
354         struct imx_drm_device *imxdrm = drm->dev_private;
355         struct imx_drm_crtc *imx_drm_crtc;
356         int ret;
357 
358         /*
359          * The vblank arrays are dimensioned by MAX_CRTC - we can't
360          * pass IDs greater than this to those functions.
361          */
362         if (imxdrm->pipes >= MAX_CRTC)
363                 return -EINVAL;
364 
365         if (imxdrm->drm->open_count)
366                 return -EBUSY;
367 
368         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
369         if (!imx_drm_crtc)
370                 return -ENOMEM;
371 
372         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
373         imx_drm_crtc->pipe = imxdrm->pipes++;
374         imx_drm_crtc->port = port;
375         imx_drm_crtc->crtc = crtc;
376 
377         imxdrm->crtc[imx_drm_crtc->pipe] = imx_drm_crtc;
378 
379         *new_crtc = imx_drm_crtc;
380 
381         ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
382         if (ret)
383                 goto err_register;
384 
385         drm_crtc_helper_add(crtc,
386                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
387 
388         drm_crtc_init(drm, crtc,
389                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
390 
391         return 0;
392 
393 err_register:
394         imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
395         kfree(imx_drm_crtc);
396         return ret;
397 }
398 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
399 
400 /*
401  * imx_drm_remove_crtc - remove a crtc
402  */
403 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
404 {
405         struct imx_drm_device *imxdrm = imx_drm_crtc->crtc->dev->dev_private;
406 
407         drm_crtc_cleanup(imx_drm_crtc->crtc);
408 
409         imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
410 
411         kfree(imx_drm_crtc);
412 
413         return 0;
414 }
415 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
416 
417 /*
418  * Find the DRM CRTC possible mask for the connected endpoint.
419  *
420  * The encoder possible masks are defined by their position in the
421  * mode_config crtc_list.  This means that CRTCs must not be added
422  * or removed once the DRM device has been fully initialised.
423  */
424 static uint32_t imx_drm_find_crtc_mask(struct imx_drm_device *imxdrm,
425         struct device_node *endpoint)
426 {
427         struct device_node *port;
428         unsigned i;
429 
430         port = of_graph_get_remote_port(endpoint);
431         if (!port)
432                 return 0;
433         of_node_put(port);
434 
435         for (i = 0; i < MAX_CRTC; i++) {
436                 struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[i];
437                 if (imx_drm_crtc && imx_drm_crtc->port == port)
438                         return drm_crtc_mask(imx_drm_crtc->crtc);
439         }
440 
441         return 0;
442 }
443 
444 static struct device_node *imx_drm_of_get_next_endpoint(
445                 const struct device_node *parent, struct device_node *prev)
446 {
447         struct device_node *node = of_graph_get_next_endpoint(parent, prev);
448         of_node_put(prev);
449         return node;
450 }
451 
452 int imx_drm_encoder_parse_of(struct drm_device *drm,
453         struct drm_encoder *encoder, struct device_node *np)
454 {
455         struct imx_drm_device *imxdrm = drm->dev_private;
456         struct device_node *ep = NULL;
457         uint32_t crtc_mask = 0;
458         int i;
459 
460         for (i = 0; ; i++) {
461                 u32 mask;
462 
463                 ep = imx_drm_of_get_next_endpoint(np, ep);
464                 if (!ep)
465                         break;
466 
467                 mask = imx_drm_find_crtc_mask(imxdrm, ep);
468 
469                 /*
470                  * If we failed to find the CRTC(s) which this encoder is
471                  * supposed to be connected to, it's because the CRTC has
472                  * not been registered yet.  Defer probing, and hope that
473                  * the required CRTC is added later.
474                  */
475                 if (mask == 0)
476                         return -EPROBE_DEFER;
477 
478                 crtc_mask |= mask;
479         }
480 
481         if (ep)
482                 of_node_put(ep);
483         if (i == 0)
484                 return -ENOENT;
485 
486         encoder->possible_crtcs = crtc_mask;
487 
488         /* FIXME: this is the mask of outputs which can clone this output. */
489         encoder->possible_clones = ~0;
490 
491         return 0;
492 }
493 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
494 
495 /*
496  * @node: device tree node containing encoder input ports
497  * @encoder: drm_encoder
498  */
499 int imx_drm_encoder_get_mux_id(struct device_node *node,
500                                struct drm_encoder *encoder)
501 {
502         struct imx_drm_crtc *imx_crtc = imx_drm_find_crtc(encoder->crtc);
503         struct device_node *ep = NULL;
504         struct of_endpoint endpoint;
505         struct device_node *port;
506         int ret;
507 
508         if (!node || !imx_crtc)
509                 return -EINVAL;
510 
511         do {
512                 ep = imx_drm_of_get_next_endpoint(node, ep);
513                 if (!ep)
514                         break;
515 
516                 port = of_graph_get_remote_port(ep);
517                 of_node_put(port);
518                 if (port == imx_crtc->port) {
519                         ret = of_graph_parse_endpoint(ep, &endpoint);
520                         return ret ? ret : endpoint.port;
521                 }
522         } while (ep);
523 
524         return -EINVAL;
525 }
526 EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
527 
528 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
529         /* none so far */
530 };
531 
532 static struct drm_driver imx_drm_driver = {
533         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
534         .load                   = imx_drm_driver_load,
535         .unload                 = imx_drm_driver_unload,
536         .lastclose              = imx_drm_driver_lastclose,
537         .preclose               = imx_drm_driver_preclose,
538         .gem_free_object        = drm_gem_cma_free_object,
539         .gem_vm_ops             = &drm_gem_cma_vm_ops,
540         .dumb_create            = drm_gem_cma_dumb_create,
541         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
542         .dumb_destroy           = drm_gem_dumb_destroy,
543 
544         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
545         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
546         .gem_prime_import       = drm_gem_prime_import,
547         .gem_prime_export       = drm_gem_prime_export,
548         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
549         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
550         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
551         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
552         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
553         .get_vblank_counter     = drm_vblank_count,
554         .enable_vblank          = imx_drm_enable_vblank,
555         .disable_vblank         = imx_drm_disable_vblank,
556         .ioctls                 = imx_drm_ioctls,
557         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
558         .fops                   = &imx_drm_driver_fops,
559         .name                   = "imx-drm",
560         .desc                   = "i.MX DRM graphics",
561         .date                   = "20120507",
562         .major                  = 1,
563         .minor                  = 0,
564         .patchlevel             = 0,
565 };
566 
567 static int compare_of(struct device *dev, void *data)
568 {
569         struct device_node *np = data;
570 
571         /* Special case for LDB, one device for two channels */
572         if (of_node_cmp(np->name, "lvds-channel") == 0) {
573                 np = of_get_parent(np);
574                 of_node_put(np);
575         }
576 
577         return dev->of_node == np;
578 }
579 
580 static LIST_HEAD(imx_drm_components);
581 
582 static int imx_drm_add_components(struct device *master, struct master *m)
583 {
584         struct imx_drm_component *component;
585         int ret;
586 
587         list_for_each_entry(component, &imx_drm_components, list) {
588                 ret = component_master_add_child(m, compare_of,
589                                                  component->of_node);
590                 if (ret)
591                         return ret;
592         }
593         return 0;
594 }
595 
596 static int imx_drm_bind(struct device *dev)
597 {
598         return drm_platform_init(&imx_drm_driver, to_platform_device(dev));
599 }
600 
601 static void imx_drm_unbind(struct device *dev)
602 {
603         drm_put_dev(dev_get_drvdata(dev));
604 }
605 
606 static const struct component_master_ops imx_drm_ops = {
607         .add_components = imx_drm_add_components,
608         .bind = imx_drm_bind,
609         .unbind = imx_drm_unbind,
610 };
611 
612 static struct imx_drm_component *imx_drm_find_component(struct device *dev,
613                 struct device_node *node)
614 {
615         struct imx_drm_component *component;
616 
617         list_for_each_entry(component, &imx_drm_components, list)
618                 if (component->of_node == node)
619                         return component;
620 
621         return NULL;
622 }
623 
624 static int imx_drm_add_component(struct device *dev, struct device_node *node)
625 {
626         struct imx_drm_component *component;
627 
628         if (imx_drm_find_component(dev, node))
629                 return 0;
630 
631         component = devm_kzalloc(dev, sizeof(*component), GFP_KERNEL);
632         if (!component)
633                 return -ENOMEM;
634 
635         component->of_node = node;
636         list_add_tail(&component->list, &imx_drm_components);
637 
638         return 0;
639 }
640 
641 static int imx_drm_platform_probe(struct platform_device *pdev)
642 {
643         struct device_node *ep, *port, *remote;
644         int ret;
645         int i;
646 
647         /*
648          * Bind the IPU display interface ports first, so that
649          * imx_drm_encoder_parse_of called from encoder .bind callbacks
650          * works as expected.
651          */
652         for (i = 0; ; i++) {
653                 port = of_parse_phandle(pdev->dev.of_node, "ports", i);
654                 if (!port)
655                         break;
656 
657                 ret = imx_drm_add_component(&pdev->dev, port);
658                 if (ret < 0)
659                         return ret;
660         }
661 
662         if (i == 0) {
663                 dev_err(&pdev->dev, "missing 'ports' property\n");
664                 return -ENODEV;
665         }
666 
667         /* Then bind all encoders */
668         for (i = 0; ; i++) {
669                 port = of_parse_phandle(pdev->dev.of_node, "ports", i);
670                 if (!port)
671                         break;
672 
673                 for_each_child_of_node(port, ep) {
674                         remote = of_graph_get_remote_port_parent(ep);
675                         if (!remote || !of_device_is_available(remote)) {
676                                 of_node_put(remote);
677                                 continue;
678                         } else if (!of_device_is_available(remote->parent)) {
679                                 dev_warn(&pdev->dev, "parent device of %s is not available\n",
680                                          remote->full_name);
681                                 of_node_put(remote);
682                                 continue;
683                         }
684 
685                         ret = imx_drm_add_component(&pdev->dev, remote);
686                         of_node_put(remote);
687                         if (ret < 0)
688                                 return ret;
689                 }
690                 of_node_put(port);
691         }
692 
693         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
694         if (ret)
695                 return ret;
696 
697         return component_master_add(&pdev->dev, &imx_drm_ops);
698 }
699 
700 static int imx_drm_platform_remove(struct platform_device *pdev)
701 {
702         component_master_del(&pdev->dev, &imx_drm_ops);
703         return 0;
704 }
705 
706 static const struct of_device_id imx_drm_dt_ids[] = {
707         { .compatible = "fsl,imx-display-subsystem", },
708         { /* sentinel */ },
709 };
710 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
711 
712 static struct platform_driver imx_drm_pdrv = {
713         .probe          = imx_drm_platform_probe,
714         .remove         = imx_drm_platform_remove,
715         .driver         = {
716                 .owner  = THIS_MODULE,
717                 .name   = "imx-drm",
718                 .of_match_table = imx_drm_dt_ids,
719         },
720 };
721 module_platform_driver(imx_drm_pdrv);
722 
723 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
724 MODULE_DESCRIPTION("i.MX drm driver core");
725 MODULE_LICENSE("GPL");
726 

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