2 * Copyright (C) STMicroelectronics SA 2014
3 * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics.
4 * License terms: GNU General Public License (GPL), version 2
9 #include <linux/component.h>
10 #include <linux/debugfs.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/of_platform.h>
15 #include <drm/drm_atomic.h>
16 #include <drm/drm_atomic_helper.h>
17 #include <drm/drm_crtc_helper.h>
18 #include <drm/drm_gem_cma_helper.h>
19 #include <drm/drm_fb_cma_helper.h>
23 #include "sti_plane.h"
25 #define DRIVER_NAME "sti"
26 #define DRIVER_DESC "STMicroelectronics SoC DRM"
27 #define DRIVER_DATE "20140601"
28 #define DRIVER_MAJOR 1
29 #define DRIVER_MINOR 0
31 #define STI_MAX_FB_HEIGHT 4096
32 #define STI_MAX_FB_WIDTH 4096
34 static int sti_drm_fps_get(void *data
, u64
*val
)
36 struct drm_device
*drm_dev
= data
;
41 list_for_each_entry(p
, &drm_dev
->mode_config
.plane_list
, head
) {
42 struct sti_plane
*plane
= to_sti_plane(p
);
44 *val
|= plane
->fps_info
.output
<< i
;
51 static int sti_drm_fps_set(void *data
, u64 val
)
53 struct drm_device
*drm_dev
= data
;
57 list_for_each_entry(p
, &drm_dev
->mode_config
.plane_list
, head
) {
58 struct sti_plane
*plane
= to_sti_plane(p
);
60 plane
->fps_info
.output
= (val
>> i
) & 1;
67 DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops
,
68 sti_drm_fps_get
, sti_drm_fps_set
, "%llu\n");
70 static int sti_drm_fps_dbg_show(struct seq_file
*s
, void *data
)
72 struct drm_info_node
*node
= s
->private;
73 struct drm_device
*dev
= node
->minor
->dev
;
76 list_for_each_entry(p
, &dev
->mode_config
.plane_list
, head
) {
77 struct sti_plane
*plane
= to_sti_plane(p
);
79 seq_printf(s
, "%s%s\n",
80 plane
->fps_info
.fps_str
,
81 plane
->fps_info
.fips_str
);
87 static struct drm_info_list sti_drm_dbg_list
[] = {
88 {"fps_get", sti_drm_fps_dbg_show
, 0},
91 static int sti_drm_debugfs_create(struct dentry
*root
,
92 struct drm_minor
*minor
,
94 const struct file_operations
*fops
)
96 struct drm_device
*dev
= minor
->dev
;
97 struct drm_info_node
*node
;
100 ent
= debugfs_create_file(name
, S_IRUGO
| S_IWUSR
, root
, dev
, fops
);
104 node
= kmalloc(sizeof(*node
), GFP_KERNEL
);
112 node
->info_ent
= (void *)fops
;
114 mutex_lock(&minor
->debugfs_lock
);
115 list_add(&node
->list
, &minor
->debugfs_list
);
116 mutex_unlock(&minor
->debugfs_lock
);
121 static int sti_drm_dbg_init(struct drm_minor
*minor
)
125 ret
= drm_debugfs_create_files(sti_drm_dbg_list
,
126 ARRAY_SIZE(sti_drm_dbg_list
),
127 minor
->debugfs_root
, minor
);
131 ret
= sti_drm_debugfs_create(minor
->debugfs_root
, minor
, "fps_show",
136 DRM_INFO("%s: debugfs installed\n", DRIVER_NAME
);
139 DRM_ERROR("%s: cannot install debugfs\n", DRIVER_NAME
);
143 void sti_drm_dbg_cleanup(struct drm_minor
*minor
)
145 drm_debugfs_remove_files(sti_drm_dbg_list
,
146 ARRAY_SIZE(sti_drm_dbg_list
), minor
);
148 drm_debugfs_remove_files((struct drm_info_list
*)&sti_drm_fps_fops
,
152 static void sti_atomic_schedule(struct sti_private
*private,
153 struct drm_atomic_state
*state
)
155 private->commit
.state
= state
;
156 schedule_work(&private->commit
.work
);
159 static void sti_atomic_complete(struct sti_private
*private,
160 struct drm_atomic_state
*state
)
162 struct drm_device
*drm
= private->drm_dev
;
165 * Everything below can be run asynchronously without the need to grab
166 * any modeset locks at all under one condition: It must be guaranteed
167 * that the asynchronous work has either been cancelled (if the driver
168 * supports it, which at least requires that the framebuffers get
169 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
170 * before the new state gets committed on the software side with
171 * drm_atomic_helper_swap_state().
173 * This scheme allows new atomic state updates to be prepared and
174 * checked in parallel to the asynchronous completion of the previous
175 * update. Which is important since compositors need to figure out the
176 * composition of the next frame right after having submitted the
180 drm_atomic_helper_commit_modeset_disables(drm
, state
);
181 drm_atomic_helper_commit_planes(drm
, state
, false);
182 drm_atomic_helper_commit_modeset_enables(drm
, state
);
184 drm_atomic_helper_wait_for_vblanks(drm
, state
);
186 drm_atomic_helper_cleanup_planes(drm
, state
);
187 drm_atomic_state_free(state
);
190 static void sti_atomic_work(struct work_struct
*work
)
192 struct sti_private
*private = container_of(work
,
193 struct sti_private
, commit
.work
);
195 sti_atomic_complete(private, private->commit
.state
);
198 static int sti_atomic_commit(struct drm_device
*drm
,
199 struct drm_atomic_state
*state
, bool nonblock
)
201 struct sti_private
*private = drm
->dev_private
;
204 err
= drm_atomic_helper_prepare_planes(drm
, state
);
208 /* serialize outstanding nonblocking commits */
209 mutex_lock(&private->commit
.lock
);
210 flush_work(&private->commit
.work
);
213 * This is the point of no return - everything below never fails except
214 * when the hw goes bonghits. Which means we can commit the new state on
215 * the software side now.
218 drm_atomic_helper_swap_state(state
, true);
221 sti_atomic_schedule(private, state
);
223 sti_atomic_complete(private, state
);
225 mutex_unlock(&private->commit
.lock
);
229 static void sti_output_poll_changed(struct drm_device
*ddev
)
231 struct sti_private
*private = ddev
->dev_private
;
233 if (!ddev
->mode_config
.num_connector
)
236 if (private->fbdev
) {
237 drm_fbdev_cma_hotplug_event(private->fbdev
);
241 private->fbdev
= drm_fbdev_cma_init(ddev
, 32,
242 ddev
->mode_config
.num_crtc
,
243 ddev
->mode_config
.num_connector
);
244 if (IS_ERR(private->fbdev
))
245 private->fbdev
= NULL
;
248 static const struct drm_mode_config_funcs sti_mode_config_funcs
= {
249 .fb_create
= drm_fb_cma_create
,
250 .output_poll_changed
= sti_output_poll_changed
,
251 .atomic_check
= drm_atomic_helper_check
,
252 .atomic_commit
= sti_atomic_commit
,
255 static void sti_mode_config_init(struct drm_device
*dev
)
257 dev
->mode_config
.min_width
= 0;
258 dev
->mode_config
.min_height
= 0;
261 * set max width and height as default value.
262 * this value would be used to check framebuffer size limitation
263 * at drm_mode_addfb().
265 dev
->mode_config
.max_width
= STI_MAX_FB_WIDTH
;
266 dev
->mode_config
.max_height
= STI_MAX_FB_HEIGHT
;
268 dev
->mode_config
.funcs
= &sti_mode_config_funcs
;
271 static const struct file_operations sti_driver_fops
= {
272 .owner
= THIS_MODULE
,
274 .mmap
= drm_gem_cma_mmap
,
277 .unlocked_ioctl
= drm_ioctl
,
279 .compat_ioctl
= drm_compat_ioctl
,
281 .release
= drm_release
,
284 static struct drm_driver sti_driver
= {
285 .driver_features
= DRIVER_HAVE_IRQ
| DRIVER_MODESET
|
286 DRIVER_GEM
| DRIVER_PRIME
| DRIVER_ATOMIC
,
287 .gem_free_object_unlocked
= drm_gem_cma_free_object
,
288 .gem_vm_ops
= &drm_gem_cma_vm_ops
,
289 .dumb_create
= drm_gem_cma_dumb_create
,
290 .dumb_map_offset
= drm_gem_cma_dumb_map_offset
,
291 .dumb_destroy
= drm_gem_dumb_destroy
,
292 .fops
= &sti_driver_fops
,
294 .get_vblank_counter
= drm_vblank_no_hw_counter
,
295 .enable_vblank
= sti_crtc_enable_vblank
,
296 .disable_vblank
= sti_crtc_disable_vblank
,
298 .prime_handle_to_fd
= drm_gem_prime_handle_to_fd
,
299 .prime_fd_to_handle
= drm_gem_prime_fd_to_handle
,
300 .gem_prime_export
= drm_gem_prime_export
,
301 .gem_prime_import
= drm_gem_prime_import
,
302 .gem_prime_get_sg_table
= drm_gem_cma_prime_get_sg_table
,
303 .gem_prime_import_sg_table
= drm_gem_cma_prime_import_sg_table
,
304 .gem_prime_vmap
= drm_gem_cma_prime_vmap
,
305 .gem_prime_vunmap
= drm_gem_cma_prime_vunmap
,
306 .gem_prime_mmap
= drm_gem_cma_prime_mmap
,
308 .debugfs_init
= sti_drm_dbg_init
,
309 .debugfs_cleanup
= sti_drm_dbg_cleanup
,
314 .major
= DRIVER_MAJOR
,
315 .minor
= DRIVER_MINOR
,
318 static int compare_of(struct device
*dev
, void *data
)
320 return dev
->of_node
== data
;
323 static int sti_init(struct drm_device
*ddev
)
325 struct sti_private
*private;
327 private = kzalloc(sizeof(*private), GFP_KERNEL
);
331 ddev
->dev_private
= (void *)private;
332 dev_set_drvdata(ddev
->dev
, ddev
);
333 private->drm_dev
= ddev
;
335 mutex_init(&private->commit
.lock
);
336 INIT_WORK(&private->commit
.work
, sti_atomic_work
);
338 drm_mode_config_init(ddev
);
340 sti_mode_config_init(ddev
);
342 drm_kms_helper_poll_init(ddev
);
347 static void sti_cleanup(struct drm_device
*ddev
)
349 struct sti_private
*private = ddev
->dev_private
;
351 if (private->fbdev
) {
352 drm_fbdev_cma_fini(private->fbdev
);
353 private->fbdev
= NULL
;
356 drm_kms_helper_poll_fini(ddev
);
357 drm_vblank_cleanup(ddev
);
359 ddev
->dev_private
= NULL
;
362 static int sti_bind(struct device
*dev
)
364 struct drm_device
*ddev
;
367 ddev
= drm_dev_alloc(&sti_driver
, dev
);
371 ddev
->platformdev
= to_platform_device(dev
);
373 ret
= sti_init(ddev
);
375 goto err_drm_dev_unref
;
377 ret
= component_bind_all(ddev
->dev
, ddev
);
381 ret
= drm_dev_register(ddev
, 0);
385 drm_mode_config_reset(ddev
);
390 drm_mode_config_cleanup(ddev
);
398 static void sti_unbind(struct device
*dev
)
400 struct drm_device
*ddev
= dev_get_drvdata(dev
);
402 drm_dev_unregister(ddev
);
407 static const struct component_master_ops sti_ops
= {
409 .unbind
= sti_unbind
,
412 static int sti_platform_probe(struct platform_device
*pdev
)
414 struct device
*dev
= &pdev
->dev
;
415 struct device_node
*node
= dev
->of_node
;
416 struct device_node
*child_np
;
417 struct component_match
*match
= NULL
;
419 dma_set_coherent_mask(dev
, DMA_BIT_MASK(32));
421 of_platform_populate(node
, NULL
, NULL
, dev
);
423 child_np
= of_get_next_available_child(node
, NULL
);
426 component_match_add(dev
, &match
, compare_of
, child_np
);
427 of_node_put(child_np
);
428 child_np
= of_get_next_available_child(node
, child_np
);
431 return component_master_add_with_match(dev
, &sti_ops
, match
);
434 static int sti_platform_remove(struct platform_device
*pdev
)
436 component_master_del(&pdev
->dev
, &sti_ops
);
437 of_platform_depopulate(&pdev
->dev
);
442 static const struct of_device_id sti_dt_ids
[] = {
443 { .compatible
= "st,sti-display-subsystem", },
446 MODULE_DEVICE_TABLE(of
, sti_dt_ids
);
448 static struct platform_driver sti_platform_driver
= {
449 .probe
= sti_platform_probe
,
450 .remove
= sti_platform_remove
,
453 .of_match_table
= sti_dt_ids
,
457 static struct platform_driver
* const drivers
[] = {
465 &sti_compositor_driver
,
466 &sti_platform_driver
,
469 static int sti_drm_init(void)
471 return platform_register_drivers(drivers
, ARRAY_SIZE(drivers
));
473 module_init(sti_drm_init
);
475 static void sti_drm_exit(void)
477 platform_unregister_drivers(drivers
, ARRAY_SIZE(drivers
));
479 module_exit(sti_drm_exit
);
481 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
482 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
483 MODULE_LICENSE("GPL");