2 * Freescale i.MX drm driver
4 * Copyright (C) 2011 Sascha Hauer, Pengutronix
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.
16 #include <linux/component.h>
17 #include <linux/device.h>
19 #include <linux/module.h>
20 #include <linux/platform_device.h>
22 #include <drm/drm_fb_helper.h>
23 #include <drm/drm_crtc_helper.h>
24 #include <drm/drm_gem_cma_helper.h>
25 #include <drm/drm_fb_cma_helper.h>
26 #include <drm/drm_plane_helper.h>
27 #include <drm/drm_of.h>
33 struct imx_drm_component
{
34 struct device_node
*of_node
;
35 struct list_head list
;
38 struct imx_drm_device
{
39 struct drm_device
*drm
;
40 struct imx_drm_crtc
*crtc
[MAX_CRTC
];
42 struct drm_fbdev_cma
*fbhelper
;
46 struct drm_crtc
*crtc
;
47 struct imx_drm_crtc_helper_funcs imx_drm_helper_funcs
;
50 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
51 static int legacyfb_depth
= 16;
52 module_param(legacyfb_depth
, int, 0444);
55 unsigned int imx_drm_crtc_id(struct imx_drm_crtc
*crtc
)
57 return drm_crtc_index(crtc
->crtc
);
59 EXPORT_SYMBOL_GPL(imx_drm_crtc_id
);
61 static void imx_drm_driver_lastclose(struct drm_device
*drm
)
63 struct imx_drm_device
*imxdrm
= drm
->dev_private
;
65 drm_fbdev_cma_restore_mode(imxdrm
->fbhelper
);
68 static int imx_drm_driver_unload(struct drm_device
*drm
)
70 struct imx_drm_device
*imxdrm
= drm
->dev_private
;
72 drm_kms_helper_poll_fini(drm
);
75 drm_fbdev_cma_fini(imxdrm
->fbhelper
);
77 component_unbind_all(drm
->dev
, drm
);
79 drm_vblank_cleanup(drm
);
80 drm_mode_config_cleanup(drm
);
82 platform_set_drvdata(drm
->platformdev
, NULL
);
87 static struct imx_drm_crtc
*imx_drm_find_crtc(struct drm_crtc
*crtc
)
89 struct imx_drm_device
*imxdrm
= crtc
->dev
->dev_private
;
92 for (i
= 0; i
< MAX_CRTC
; i
++)
93 if (imxdrm
->crtc
[i
] && imxdrm
->crtc
[i
]->crtc
== crtc
)
94 return imxdrm
->crtc
[i
];
99 int imx_drm_set_bus_format_pins(struct drm_encoder
*encoder
, u32 bus_format
,
100 int hsync_pin
, int vsync_pin
)
102 struct imx_drm_crtc_helper_funcs
*helper
;
103 struct imx_drm_crtc
*imx_crtc
;
105 imx_crtc
= imx_drm_find_crtc(encoder
->crtc
);
109 helper
= &imx_crtc
->imx_drm_helper_funcs
;
110 if (helper
->set_interface_pix_fmt
)
111 return helper
->set_interface_pix_fmt(encoder
->crtc
,
112 bus_format
, hsync_pin
, vsync_pin
);
115 EXPORT_SYMBOL_GPL(imx_drm_set_bus_format_pins
);
117 int imx_drm_set_bus_format(struct drm_encoder
*encoder
, u32 bus_format
)
119 return imx_drm_set_bus_format_pins(encoder
, bus_format
, 2, 3);
121 EXPORT_SYMBOL_GPL(imx_drm_set_bus_format
);
123 int imx_drm_crtc_vblank_get(struct imx_drm_crtc
*imx_drm_crtc
)
125 return drm_crtc_vblank_get(imx_drm_crtc
->crtc
);
127 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get
);
129 void imx_drm_crtc_vblank_put(struct imx_drm_crtc
*imx_drm_crtc
)
131 drm_crtc_vblank_put(imx_drm_crtc
->crtc
);
133 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put
);
135 void imx_drm_handle_vblank(struct imx_drm_crtc
*imx_drm_crtc
)
137 drm_crtc_handle_vblank(imx_drm_crtc
->crtc
);
139 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank
);
141 static int imx_drm_enable_vblank(struct drm_device
*drm
, unsigned int pipe
)
143 struct imx_drm_device
*imxdrm
= drm
->dev_private
;
144 struct imx_drm_crtc
*imx_drm_crtc
= imxdrm
->crtc
[pipe
];
150 if (!imx_drm_crtc
->imx_drm_helper_funcs
.enable_vblank
)
153 ret
= imx_drm_crtc
->imx_drm_helper_funcs
.enable_vblank(
159 static void imx_drm_disable_vblank(struct drm_device
*drm
, unsigned int pipe
)
161 struct imx_drm_device
*imxdrm
= drm
->dev_private
;
162 struct imx_drm_crtc
*imx_drm_crtc
= imxdrm
->crtc
[pipe
];
167 if (!imx_drm_crtc
->imx_drm_helper_funcs
.disable_vblank
)
170 imx_drm_crtc
->imx_drm_helper_funcs
.disable_vblank(imx_drm_crtc
->crtc
);
173 static const struct file_operations imx_drm_driver_fops
= {
174 .owner
= THIS_MODULE
,
176 .release
= drm_release
,
177 .unlocked_ioctl
= drm_ioctl
,
178 .mmap
= drm_gem_cma_mmap
,
181 .llseek
= noop_llseek
,
184 void imx_drm_connector_destroy(struct drm_connector
*connector
)
186 drm_connector_unregister(connector
);
187 drm_connector_cleanup(connector
);
189 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy
);
191 void imx_drm_encoder_destroy(struct drm_encoder
*encoder
)
193 drm_encoder_cleanup(encoder
);
195 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy
);
197 static void imx_drm_output_poll_changed(struct drm_device
*drm
)
199 struct imx_drm_device
*imxdrm
= drm
->dev_private
;
201 drm_fbdev_cma_hotplug_event(imxdrm
->fbhelper
);
204 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs
= {
205 .fb_create
= drm_fb_cma_create
,
206 .output_poll_changed
= imx_drm_output_poll_changed
,
210 * Main DRM initialisation. This binds, initialises and registers
211 * with DRM the subcomponents of the driver.
213 static int imx_drm_driver_load(struct drm_device
*drm
, unsigned long flags
)
215 struct imx_drm_device
*imxdrm
;
216 struct drm_connector
*connector
;
219 imxdrm
= devm_kzalloc(drm
->dev
, sizeof(*imxdrm
), GFP_KERNEL
);
225 drm
->dev_private
= imxdrm
;
228 * enable drm irq mode.
229 * - with irq_enabled = true, we can use the vblank feature.
231 * P.S. note that we wouldn't use drm irq handler but
232 * just specific driver own one instead because
233 * drm framework supports only one irq handler and
234 * drivers can well take care of their interrupts
236 drm
->irq_enabled
= true;
239 * set max width and height as default value(4096x4096).
240 * this value would be used to check framebuffer size limitation
241 * at drm_mode_addfb().
243 drm
->mode_config
.min_width
= 64;
244 drm
->mode_config
.min_height
= 64;
245 drm
->mode_config
.max_width
= 4096;
246 drm
->mode_config
.max_height
= 4096;
247 drm
->mode_config
.funcs
= &imx_drm_mode_config_funcs
;
249 drm_mode_config_init(drm
);
251 ret
= drm_vblank_init(drm
, MAX_CRTC
);
256 * with vblank_disable_allowed = true, vblank interrupt will be
257 * disabled by drm timer once a current process gives up ownership
258 * of vblank event. (after drm_vblank_put function is called)
260 drm
->vblank_disable_allowed
= true;
262 platform_set_drvdata(drm
->platformdev
, drm
);
264 /* Now try and bind all our sub-components */
265 ret
= component_bind_all(drm
->dev
, drm
);
270 * All components are now added, we can publish the connector sysfs
271 * entries to userspace. This will generate hotplug events and so
272 * userspace will expect to be able to access DRM at this point.
274 list_for_each_entry(connector
, &drm
->mode_config
.connector_list
, head
) {
275 ret
= drm_connector_register(connector
);
278 "[CONNECTOR:%d:%s] drm_connector_register failed: %d\n",
280 connector
->name
, ret
);
286 * All components are now initialised, so setup the fb helper.
287 * The fb helper takes copies of key hardware information, so the
288 * crtcs/connectors/encoders must not change after this point.
290 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
291 if (legacyfb_depth
!= 16 && legacyfb_depth
!= 32) {
292 dev_warn(drm
->dev
, "Invalid legacyfb_depth. Defaulting to 16bpp\n");
295 drm_helper_disable_unused_functions(drm
);
296 imxdrm
->fbhelper
= drm_fbdev_cma_init(drm
, legacyfb_depth
,
297 drm
->mode_config
.num_crtc
, MAX_CRTC
);
298 if (IS_ERR(imxdrm
->fbhelper
)) {
299 ret
= PTR_ERR(imxdrm
->fbhelper
);
300 imxdrm
->fbhelper
= NULL
;
305 drm_kms_helper_poll_init(drm
);
310 component_unbind_all(drm
->dev
, drm
);
312 drm_vblank_cleanup(drm
);
314 drm_mode_config_cleanup(drm
);
320 * imx_drm_add_crtc - add a new crtc
322 int imx_drm_add_crtc(struct drm_device
*drm
, struct drm_crtc
*crtc
,
323 struct imx_drm_crtc
**new_crtc
, struct drm_plane
*primary_plane
,
324 const struct imx_drm_crtc_helper_funcs
*imx_drm_helper_funcs
,
325 struct device_node
*port
)
327 struct imx_drm_device
*imxdrm
= drm
->dev_private
;
328 struct imx_drm_crtc
*imx_drm_crtc
;
331 * The vblank arrays are dimensioned by MAX_CRTC - we can't
332 * pass IDs greater than this to those functions.
334 if (imxdrm
->pipes
>= MAX_CRTC
)
337 if (imxdrm
->drm
->open_count
)
340 imx_drm_crtc
= kzalloc(sizeof(*imx_drm_crtc
), GFP_KERNEL
);
344 imx_drm_crtc
->imx_drm_helper_funcs
= *imx_drm_helper_funcs
;
345 imx_drm_crtc
->crtc
= crtc
;
349 imxdrm
->crtc
[imxdrm
->pipes
++] = imx_drm_crtc
;
351 *new_crtc
= imx_drm_crtc
;
353 drm_crtc_helper_add(crtc
,
354 imx_drm_crtc
->imx_drm_helper_funcs
.crtc_helper_funcs
);
356 drm_crtc_init_with_planes(drm
, crtc
, primary_plane
, NULL
,
357 imx_drm_crtc
->imx_drm_helper_funcs
.crtc_funcs
, NULL
);
361 EXPORT_SYMBOL_GPL(imx_drm_add_crtc
);
364 * imx_drm_remove_crtc - remove a crtc
366 int imx_drm_remove_crtc(struct imx_drm_crtc
*imx_drm_crtc
)
368 struct imx_drm_device
*imxdrm
= imx_drm_crtc
->crtc
->dev
->dev_private
;
369 unsigned int pipe
= drm_crtc_index(imx_drm_crtc
->crtc
);
371 drm_crtc_cleanup(imx_drm_crtc
->crtc
);
373 imxdrm
->crtc
[pipe
] = NULL
;
379 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc
);
381 int imx_drm_encoder_parse_of(struct drm_device
*drm
,
382 struct drm_encoder
*encoder
, struct device_node
*np
)
384 uint32_t crtc_mask
= drm_of_find_possible_crtcs(drm
, np
);
387 * If we failed to find the CRTC(s) which this encoder is
388 * supposed to be connected to, it's because the CRTC has
389 * not been registered yet. Defer probing, and hope that
390 * the required CRTC is added later.
393 return -EPROBE_DEFER
;
395 encoder
->possible_crtcs
= crtc_mask
;
397 /* FIXME: this is the mask of outputs which can clone this output. */
398 encoder
->possible_clones
= ~0;
402 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of
);
404 static const struct drm_ioctl_desc imx_drm_ioctls
[] = {
408 static struct drm_driver imx_drm_driver
= {
409 .driver_features
= DRIVER_MODESET
| DRIVER_GEM
| DRIVER_PRIME
,
410 .load
= imx_drm_driver_load
,
411 .unload
= imx_drm_driver_unload
,
412 .lastclose
= imx_drm_driver_lastclose
,
413 .set_busid
= drm_platform_set_busid
,
414 .gem_free_object
= drm_gem_cma_free_object
,
415 .gem_vm_ops
= &drm_gem_cma_vm_ops
,
416 .dumb_create
= drm_gem_cma_dumb_create
,
417 .dumb_map_offset
= drm_gem_cma_dumb_map_offset
,
418 .dumb_destroy
= drm_gem_dumb_destroy
,
420 .prime_handle_to_fd
= drm_gem_prime_handle_to_fd
,
421 .prime_fd_to_handle
= drm_gem_prime_fd_to_handle
,
422 .gem_prime_import
= drm_gem_prime_import
,
423 .gem_prime_export
= drm_gem_prime_export
,
424 .gem_prime_get_sg_table
= drm_gem_cma_prime_get_sg_table
,
425 .gem_prime_import_sg_table
= drm_gem_cma_prime_import_sg_table
,
426 .gem_prime_vmap
= drm_gem_cma_prime_vmap
,
427 .gem_prime_vunmap
= drm_gem_cma_prime_vunmap
,
428 .gem_prime_mmap
= drm_gem_cma_prime_mmap
,
429 .get_vblank_counter
= drm_vblank_no_hw_counter
,
430 .enable_vblank
= imx_drm_enable_vblank
,
431 .disable_vblank
= imx_drm_disable_vblank
,
432 .ioctls
= imx_drm_ioctls
,
433 .num_ioctls
= ARRAY_SIZE(imx_drm_ioctls
),
434 .fops
= &imx_drm_driver_fops
,
436 .desc
= "i.MX DRM graphics",
443 static int compare_of(struct device
*dev
, void *data
)
445 struct device_node
*np
= data
;
447 /* Special case for LDB, one device for two channels */
448 if (of_node_cmp(np
->name
, "lvds-channel") == 0) {
449 np
= of_get_parent(np
);
453 return dev
->of_node
== np
;
456 static int imx_drm_bind(struct device
*dev
)
458 return drm_platform_init(&imx_drm_driver
, to_platform_device(dev
));
461 static void imx_drm_unbind(struct device
*dev
)
463 drm_put_dev(dev_get_drvdata(dev
));
466 static const struct component_master_ops imx_drm_ops
= {
467 .bind
= imx_drm_bind
,
468 .unbind
= imx_drm_unbind
,
471 static int imx_drm_platform_probe(struct platform_device
*pdev
)
473 int ret
= drm_of_component_probe(&pdev
->dev
, compare_of
, &imx_drm_ops
);
476 ret
= dma_set_coherent_mask(&pdev
->dev
, DMA_BIT_MASK(32));
481 static int imx_drm_platform_remove(struct platform_device
*pdev
)
483 component_master_del(&pdev
->dev
, &imx_drm_ops
);
487 #ifdef CONFIG_PM_SLEEP
488 static int imx_drm_suspend(struct device
*dev
)
490 struct drm_device
*drm_dev
= dev_get_drvdata(dev
);
492 /* The drm_dev is NULL before .load hook is called */
496 drm_kms_helper_poll_disable(drm_dev
);
501 static int imx_drm_resume(struct device
*dev
)
503 struct drm_device
*drm_dev
= dev_get_drvdata(dev
);
508 drm_helper_resume_force_mode(drm_dev
);
509 drm_kms_helper_poll_enable(drm_dev
);
515 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops
, imx_drm_suspend
, imx_drm_resume
);
517 static const struct of_device_id imx_drm_dt_ids
[] = {
518 { .compatible
= "fsl,imx-display-subsystem", },
521 MODULE_DEVICE_TABLE(of
, imx_drm_dt_ids
);
523 static struct platform_driver imx_drm_pdrv
= {
524 .probe
= imx_drm_platform_probe
,
525 .remove
= imx_drm_platform_remove
,
528 .pm
= &imx_drm_pm_ops
,
529 .of_match_table
= imx_drm_dt_ids
,
532 module_platform_driver(imx_drm_pdrv
);
534 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
535 MODULE_DESCRIPTION("i.MX drm driver core");
536 MODULE_LICENSE("GPL");