Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/aperture.h>
4#include <linux/clk.h>
5#include <linux/of_clk.h>
6#include <linux/minmax.h>
7#include <linux/of_address.h>
8#include <linux/platform_data/simplefb.h>
9#include <linux/platform_device.h>
10#include <linux/pm_domain.h>
11#include <linux/regulator/consumer.h>
12
13#include <drm/drm_atomic.h>
14#include <drm/drm_atomic_state_helper.h>
15#include <drm/drm_client_setup.h>
16#include <drm/drm_connector.h>
17#include <drm/drm_crtc_helper.h>
18#include <drm/drm_damage_helper.h>
19#include <drm/drm_device.h>
20#include <drm/drm_drv.h>
21#include <drm/drm_fbdev_shmem.h>
22#include <drm/drm_format_helper.h>
23#include <drm/drm_framebuffer.h>
24#include <drm/drm_gem_atomic_helper.h>
25#include <drm/drm_gem_framebuffer_helper.h>
26#include <drm/drm_gem_shmem_helper.h>
27#include <drm/drm_managed.h>
28#include <drm/drm_modeset_helper_vtables.h>
29#include <drm/drm_panic.h>
30#include <drm/drm_probe_helper.h>
31
32#define DRIVER_NAME "simpledrm"
33#define DRIVER_DESC "DRM driver for simple-framebuffer platform devices"
34#define DRIVER_DATE "20200625"
35#define DRIVER_MAJOR 1
36#define DRIVER_MINOR 0
37
38/*
39 * Helpers for simplefb
40 */
41
42static int
43simplefb_get_validated_int(struct drm_device *dev, const char *name,
44 uint32_t value)
45{
46 if (value > INT_MAX) {
47 drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
48 name, value);
49 return -EINVAL;
50 }
51 return (int)value;
52}
53
54static int
55simplefb_get_validated_int0(struct drm_device *dev, const char *name,
56 uint32_t value)
57{
58 if (!value) {
59 drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
60 name, value);
61 return -EINVAL;
62 }
63 return simplefb_get_validated_int(dev, name, value);
64}
65
66static const struct drm_format_info *
67simplefb_get_validated_format(struct drm_device *dev, const char *format_name)
68{
69 static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;
70 const struct simplefb_format *fmt = formats;
71 const struct simplefb_format *end = fmt + ARRAY_SIZE(formats);
72 const struct drm_format_info *info;
73
74 if (!format_name) {
75 drm_err(dev, "simplefb: missing framebuffer format\n");
76 return ERR_PTR(-EINVAL);
77 }
78
79 while (fmt < end) {
80 if (!strcmp(format_name, fmt->name)) {
81 info = drm_format_info(fmt->fourcc);
82 if (!info)
83 return ERR_PTR(-EINVAL);
84 return info;
85 }
86 ++fmt;
87 }
88
89 drm_err(dev, "simplefb: unknown framebuffer format %s\n",
90 format_name);
91
92 return ERR_PTR(-EINVAL);
93}
94
95static int
96simplefb_get_width_pd(struct drm_device *dev,
97 const struct simplefb_platform_data *pd)
98{
99 return simplefb_get_validated_int0(dev, "width", pd->width);
100}
101
102static int
103simplefb_get_height_pd(struct drm_device *dev,
104 const struct simplefb_platform_data *pd)
105{
106 return simplefb_get_validated_int0(dev, "height", pd->height);
107}
108
109static int
110simplefb_get_stride_pd(struct drm_device *dev,
111 const struct simplefb_platform_data *pd)
112{
113 return simplefb_get_validated_int(dev, "stride", pd->stride);
114}
115
116static const struct drm_format_info *
117simplefb_get_format_pd(struct drm_device *dev,
118 const struct simplefb_platform_data *pd)
119{
120 return simplefb_get_validated_format(dev, pd->format);
121}
122
123static int
124simplefb_read_u32_of(struct drm_device *dev, struct device_node *of_node,
125 const char *name, u32 *value)
126{
127 int ret = of_property_read_u32(of_node, name, value);
128
129 if (ret)
130 drm_err(dev, "simplefb: cannot parse framebuffer %s: error %d\n",
131 name, ret);
132 return ret;
133}
134
135static int
136simplefb_read_string_of(struct drm_device *dev, struct device_node *of_node,
137 const char *name, const char **value)
138{
139 int ret = of_property_read_string(of_node, name, value);
140
141 if (ret)
142 drm_err(dev, "simplefb: cannot parse framebuffer %s: error %d\n",
143 name, ret);
144 return ret;
145}
146
147static int
148simplefb_get_width_of(struct drm_device *dev, struct device_node *of_node)
149{
150 u32 width;
151 int ret = simplefb_read_u32_of(dev, of_node, "width", &width);
152
153 if (ret)
154 return ret;
155 return simplefb_get_validated_int0(dev, "width", width);
156}
157
158static int
159simplefb_get_height_of(struct drm_device *dev, struct device_node *of_node)
160{
161 u32 height;
162 int ret = simplefb_read_u32_of(dev, of_node, "height", &height);
163
164 if (ret)
165 return ret;
166 return simplefb_get_validated_int0(dev, "height", height);
167}
168
169static int
170simplefb_get_stride_of(struct drm_device *dev, struct device_node *of_node)
171{
172 u32 stride;
173 int ret = simplefb_read_u32_of(dev, of_node, "stride", &stride);
174
175 if (ret)
176 return ret;
177 return simplefb_get_validated_int(dev, "stride", stride);
178}
179
180static const struct drm_format_info *
181simplefb_get_format_of(struct drm_device *dev, struct device_node *of_node)
182{
183 const char *format;
184 int ret = simplefb_read_string_of(dev, of_node, "format", &format);
185
186 if (ret)
187 return ERR_PTR(ret);
188 return simplefb_get_validated_format(dev, format);
189}
190
191static struct resource *
192simplefb_get_memory_of(struct drm_device *dev, struct device_node *of_node)
193{
194 struct device_node *np;
195 struct resource *res;
196 int err;
197
198 np = of_parse_phandle(of_node, "memory-region", 0);
199 if (!np)
200 return NULL;
201
202 res = devm_kzalloc(dev->dev, sizeof(*res), GFP_KERNEL);
203 if (!res)
204 return ERR_PTR(-ENOMEM);
205
206 err = of_address_to_resource(np, 0, res);
207 if (err)
208 return ERR_PTR(err);
209
210 if (of_property_present(of_node, "reg"))
211 drm_warn(dev, "preferring \"memory-region\" over \"reg\" property\n");
212
213 return res;
214}
215
216/*
217 * Simple Framebuffer device
218 */
219
220struct simpledrm_device {
221 struct drm_device dev;
222
223 /* clocks */
224#if defined CONFIG_OF && defined CONFIG_COMMON_CLK
225 unsigned int clk_count;
226 struct clk **clks;
227#endif
228 /* regulators */
229#if defined CONFIG_OF && defined CONFIG_REGULATOR
230 unsigned int regulator_count;
231 struct regulator **regulators;
232#endif
233 /* power-domains */
234#if defined CONFIG_OF && defined CONFIG_PM_GENERIC_DOMAINS
235 int pwr_dom_count;
236 struct device **pwr_dom_devs;
237 struct device_link **pwr_dom_links;
238#endif
239
240 /* simplefb settings */
241 struct drm_display_mode mode;
242 const struct drm_format_info *format;
243 unsigned int pitch;
244
245 /* memory management */
246 struct iosys_map screen_base;
247
248 /* modesetting */
249 uint32_t formats[8];
250 size_t nformats;
251 struct drm_plane primary_plane;
252 struct drm_crtc crtc;
253 struct drm_encoder encoder;
254 struct drm_connector connector;
255};
256
257static struct simpledrm_device *simpledrm_device_of_dev(struct drm_device *dev)
258{
259 return container_of(dev, struct simpledrm_device, dev);
260}
261
262/*
263 * Hardware
264 */
265
266#if defined CONFIG_OF && defined CONFIG_COMMON_CLK
267/*
268 * Clock handling code.
269 *
270 * Here we handle the clocks property of our "simple-framebuffer" dt node.
271 * This is necessary so that we can make sure that any clocks needed by
272 * the display engine that the bootloader set up for us (and for which it
273 * provided a simplefb dt node), stay up, for the life of the simplefb
274 * driver.
275 *
276 * When the driver unloads, we cleanly disable, and then release the clocks.
277 *
278 * We only complain about errors here, no action is taken as the most likely
279 * error can only happen due to a mismatch between the bootloader which set
280 * up simplefb, and the clock definitions in the device tree. Chances are
281 * that there are no adverse effects, and if there are, a clean teardown of
282 * the fb probe will not help us much either. So just complain and carry on,
283 * and hope that the user actually gets a working fb at the end of things.
284 */
285
286static void simpledrm_device_release_clocks(void *res)
287{
288 struct simpledrm_device *sdev = simpledrm_device_of_dev(res);
289 unsigned int i;
290
291 for (i = 0; i < sdev->clk_count; ++i) {
292 if (sdev->clks[i]) {
293 clk_disable_unprepare(sdev->clks[i]);
294 clk_put(sdev->clks[i]);
295 }
296 }
297}
298
299static int simpledrm_device_init_clocks(struct simpledrm_device *sdev)
300{
301 struct drm_device *dev = &sdev->dev;
302 struct platform_device *pdev = to_platform_device(dev->dev);
303 struct device_node *of_node = pdev->dev.of_node;
304 struct clk *clock;
305 unsigned int i;
306 int ret;
307
308 if (dev_get_platdata(&pdev->dev) || !of_node)
309 return 0;
310
311 sdev->clk_count = of_clk_get_parent_count(of_node);
312 if (!sdev->clk_count)
313 return 0;
314
315 sdev->clks = drmm_kzalloc(dev, sdev->clk_count * sizeof(sdev->clks[0]),
316 GFP_KERNEL);
317 if (!sdev->clks)
318 return -ENOMEM;
319
320 for (i = 0; i < sdev->clk_count; ++i) {
321 clock = of_clk_get(of_node, i);
322 if (IS_ERR(clock)) {
323 ret = PTR_ERR(clock);
324 if (ret == -EPROBE_DEFER)
325 goto err;
326 drm_err(dev, "clock %u not found: %d\n", i, ret);
327 continue;
328 }
329 ret = clk_prepare_enable(clock);
330 if (ret) {
331 drm_err(dev, "failed to enable clock %u: %d\n",
332 i, ret);
333 clk_put(clock);
334 continue;
335 }
336 sdev->clks[i] = clock;
337 }
338
339 return devm_add_action_or_reset(&pdev->dev,
340 simpledrm_device_release_clocks,
341 sdev);
342
343err:
344 while (i) {
345 --i;
346 if (sdev->clks[i]) {
347 clk_disable_unprepare(sdev->clks[i]);
348 clk_put(sdev->clks[i]);
349 }
350 }
351 return ret;
352}
353#else
354static int simpledrm_device_init_clocks(struct simpledrm_device *sdev)
355{
356 return 0;
357}
358#endif
359
360#if defined CONFIG_OF && defined CONFIG_REGULATOR
361
362#define SUPPLY_SUFFIX "-supply"
363
364/*
365 * Regulator handling code.
366 *
367 * Here we handle the num-supplies and vin*-supply properties of our
368 * "simple-framebuffer" dt node. This is necessary so that we can make sure
369 * that any regulators needed by the display hardware that the bootloader
370 * set up for us (and for which it provided a simplefb dt node), stay up,
371 * for the life of the simplefb driver.
372 *
373 * When the driver unloads, we cleanly disable, and then release the
374 * regulators.
375 *
376 * We only complain about errors here, no action is taken as the most likely
377 * error can only happen due to a mismatch between the bootloader which set
378 * up simplefb, and the regulator definitions in the device tree. Chances are
379 * that there are no adverse effects, and if there are, a clean teardown of
380 * the fb probe will not help us much either. So just complain and carry on,
381 * and hope that the user actually gets a working fb at the end of things.
382 */
383
384static void simpledrm_device_release_regulators(void *res)
385{
386 struct simpledrm_device *sdev = simpledrm_device_of_dev(res);
387 unsigned int i;
388
389 for (i = 0; i < sdev->regulator_count; ++i) {
390 if (sdev->regulators[i]) {
391 regulator_disable(sdev->regulators[i]);
392 regulator_put(sdev->regulators[i]);
393 }
394 }
395}
396
397static int simpledrm_device_init_regulators(struct simpledrm_device *sdev)
398{
399 struct drm_device *dev = &sdev->dev;
400 struct platform_device *pdev = to_platform_device(dev->dev);
401 struct device_node *of_node = pdev->dev.of_node;
402 struct property *prop;
403 struct regulator *regulator;
404 const char *p;
405 unsigned int count = 0, i = 0;
406 int ret;
407
408 if (dev_get_platdata(&pdev->dev) || !of_node)
409 return 0;
410
411 /* Count the number of regulator supplies */
412 for_each_property_of_node(of_node, prop) {
413 p = strstr(prop->name, SUPPLY_SUFFIX);
414 if (p && p != prop->name)
415 ++count;
416 }
417
418 if (!count)
419 return 0;
420
421 sdev->regulators = drmm_kzalloc(dev,
422 count * sizeof(sdev->regulators[0]),
423 GFP_KERNEL);
424 if (!sdev->regulators)
425 return -ENOMEM;
426
427 for_each_property_of_node(of_node, prop) {
428 char name[32]; /* 32 is max size of property name */
429 size_t len;
430
431 p = strstr(prop->name, SUPPLY_SUFFIX);
432 if (!p || p == prop->name)
433 continue;
434 len = strlen(prop->name) - strlen(SUPPLY_SUFFIX) + 1;
435 strscpy(name, prop->name, min(sizeof(name), len));
436
437 regulator = regulator_get_optional(&pdev->dev, name);
438 if (IS_ERR(regulator)) {
439 ret = PTR_ERR(regulator);
440 if (ret == -EPROBE_DEFER)
441 goto err;
442 drm_err(dev, "regulator %s not found: %d\n",
443 name, ret);
444 continue;
445 }
446
447 ret = regulator_enable(regulator);
448 if (ret) {
449 drm_err(dev, "failed to enable regulator %u: %d\n",
450 i, ret);
451 regulator_put(regulator);
452 continue;
453 }
454
455 sdev->regulators[i++] = regulator;
456 }
457 sdev->regulator_count = i;
458
459 return devm_add_action_or_reset(&pdev->dev,
460 simpledrm_device_release_regulators,
461 sdev);
462
463err:
464 while (i) {
465 --i;
466 if (sdev->regulators[i]) {
467 regulator_disable(sdev->regulators[i]);
468 regulator_put(sdev->regulators[i]);
469 }
470 }
471 return ret;
472}
473#else
474static int simpledrm_device_init_regulators(struct simpledrm_device *sdev)
475{
476 return 0;
477}
478#endif
479
480#if defined CONFIG_OF && defined CONFIG_PM_GENERIC_DOMAINS
481/*
482 * Generic power domain handling code.
483 *
484 * Here we handle the power-domains properties of our "simple-framebuffer"
485 * dt node. This is only necessary if there is more than one power-domain.
486 * A single power-domains is handled automatically by the driver core. Multiple
487 * power-domains have to be handled by drivers since the driver core can't know
488 * the correct power sequencing. Power sequencing is not an issue for simpledrm
489 * since the bootloader has put the power domains already in the correct state.
490 * simpledrm has only to ensure they remain active for its lifetime.
491 *
492 * When the driver unloads, we detach from the power-domains.
493 *
494 * We only complain about errors here, no action is taken as the most likely
495 * error can only happen due to a mismatch between the bootloader which set
496 * up the "simple-framebuffer" dt node, and the PM domain providers in the
497 * device tree. Chances are that there are no adverse effects, and if there are,
498 * a clean teardown of the fb probe will not help us much either. So just
499 * complain and carry on, and hope that the user actually gets a working fb at
500 * the end of things.
501 */
502static void simpledrm_device_detach_genpd(void *res)
503{
504 int i;
505 struct simpledrm_device *sdev = res;
506
507 if (sdev->pwr_dom_count <= 1)
508 return;
509
510 for (i = sdev->pwr_dom_count - 1; i >= 0; i--) {
511 if (sdev->pwr_dom_links[i])
512 device_link_del(sdev->pwr_dom_links[i]);
513 if (!IS_ERR_OR_NULL(sdev->pwr_dom_devs[i]))
514 dev_pm_domain_detach(sdev->pwr_dom_devs[i], true);
515 }
516}
517
518static int simpledrm_device_attach_genpd(struct simpledrm_device *sdev)
519{
520 struct device *dev = sdev->dev.dev;
521 int i;
522
523 sdev->pwr_dom_count = of_count_phandle_with_args(dev->of_node, "power-domains",
524 "#power-domain-cells");
525 /*
526 * Single power-domain devices are handled by driver core nothing to do
527 * here. The same for device nodes without "power-domains" property.
528 */
529 if (sdev->pwr_dom_count <= 1)
530 return 0;
531
532 sdev->pwr_dom_devs = devm_kcalloc(dev, sdev->pwr_dom_count,
533 sizeof(*sdev->pwr_dom_devs),
534 GFP_KERNEL);
535 if (!sdev->pwr_dom_devs)
536 return -ENOMEM;
537
538 sdev->pwr_dom_links = devm_kcalloc(dev, sdev->pwr_dom_count,
539 sizeof(*sdev->pwr_dom_links),
540 GFP_KERNEL);
541 if (!sdev->pwr_dom_links)
542 return -ENOMEM;
543
544 for (i = 0; i < sdev->pwr_dom_count; i++) {
545 sdev->pwr_dom_devs[i] = dev_pm_domain_attach_by_id(dev, i);
546 if (IS_ERR(sdev->pwr_dom_devs[i])) {
547 int ret = PTR_ERR(sdev->pwr_dom_devs[i]);
548 if (ret == -EPROBE_DEFER) {
549 simpledrm_device_detach_genpd(sdev);
550 return ret;
551 }
552 drm_warn(&sdev->dev,
553 "pm_domain_attach_by_id(%u) failed: %d\n", i, ret);
554 continue;
555 }
556
557 sdev->pwr_dom_links[i] = device_link_add(dev,
558 sdev->pwr_dom_devs[i],
559 DL_FLAG_STATELESS |
560 DL_FLAG_PM_RUNTIME |
561 DL_FLAG_RPM_ACTIVE);
562 if (!sdev->pwr_dom_links[i])
563 drm_warn(&sdev->dev, "failed to link power-domain %d\n", i);
564 }
565
566 return devm_add_action_or_reset(dev, simpledrm_device_detach_genpd, sdev);
567}
568#else
569static int simpledrm_device_attach_genpd(struct simpledrm_device *sdev)
570{
571 return 0;
572}
573#endif
574
575/*
576 * Modesetting
577 */
578
579static const uint64_t simpledrm_primary_plane_format_modifiers[] = {
580 DRM_FORMAT_MOD_LINEAR,
581 DRM_FORMAT_MOD_INVALID
582};
583
584static int simpledrm_primary_plane_helper_atomic_check(struct drm_plane *plane,
585 struct drm_atomic_state *state)
586{
587 struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
588 struct drm_shadow_plane_state *new_shadow_plane_state =
589 to_drm_shadow_plane_state(new_plane_state);
590 struct drm_framebuffer *new_fb = new_plane_state->fb;
591 struct drm_crtc *new_crtc = new_plane_state->crtc;
592 struct drm_crtc_state *new_crtc_state = NULL;
593 struct drm_device *dev = plane->dev;
594 struct simpledrm_device *sdev = simpledrm_device_of_dev(dev);
595 int ret;
596
597 if (new_crtc)
598 new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
599
600 ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
601 DRM_PLANE_NO_SCALING,
602 DRM_PLANE_NO_SCALING,
603 false, false);
604 if (ret)
605 return ret;
606 else if (!new_plane_state->visible)
607 return 0;
608
609 if (new_fb->format != sdev->format) {
610 void *buf;
611
612 /* format conversion necessary; reserve buffer */
613 buf = drm_format_conv_state_reserve(&new_shadow_plane_state->fmtcnv_state,
614 sdev->pitch, GFP_KERNEL);
615 if (!buf)
616 return -ENOMEM;
617 }
618
619 return 0;
620}
621
622static void simpledrm_primary_plane_helper_atomic_update(struct drm_plane *plane,
623 struct drm_atomic_state *state)
624{
625 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
626 struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
627 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
628 struct drm_framebuffer *fb = plane_state->fb;
629 struct drm_device *dev = plane->dev;
630 struct simpledrm_device *sdev = simpledrm_device_of_dev(dev);
631 struct drm_atomic_helper_damage_iter iter;
632 struct drm_rect damage;
633 int ret, idx;
634
635 ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
636 if (ret)
637 return;
638
639 if (!drm_dev_enter(dev, &idx))
640 goto out_drm_gem_fb_end_cpu_access;
641
642 drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
643 drm_atomic_for_each_plane_damage(&iter, &damage) {
644 struct drm_rect dst_clip = plane_state->dst;
645 struct iosys_map dst = sdev->screen_base;
646
647 if (!drm_rect_intersect(&dst_clip, &damage))
648 continue;
649
650 iosys_map_incr(&dst, drm_fb_clip_offset(sdev->pitch, sdev->format, &dst_clip));
651 drm_fb_blit(&dst, &sdev->pitch, sdev->format->format, shadow_plane_state->data,
652 fb, &damage, &shadow_plane_state->fmtcnv_state);
653 }
654
655 drm_dev_exit(idx);
656out_drm_gem_fb_end_cpu_access:
657 drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
658}
659
660static void simpledrm_primary_plane_helper_atomic_disable(struct drm_plane *plane,
661 struct drm_atomic_state *state)
662{
663 struct drm_device *dev = plane->dev;
664 struct simpledrm_device *sdev = simpledrm_device_of_dev(dev);
665 int idx;
666
667 if (!drm_dev_enter(dev, &idx))
668 return;
669
670 /* Clear screen to black if disabled */
671 iosys_map_memset(&sdev->screen_base, 0, 0, sdev->pitch * sdev->mode.vdisplay);
672
673 drm_dev_exit(idx);
674}
675
676static int simpledrm_primary_plane_helper_get_scanout_buffer(struct drm_plane *plane,
677 struct drm_scanout_buffer *sb)
678{
679 struct simpledrm_device *sdev = simpledrm_device_of_dev(plane->dev);
680
681 sb->width = sdev->mode.hdisplay;
682 sb->height = sdev->mode.vdisplay;
683 sb->format = sdev->format;
684 sb->pitch[0] = sdev->pitch;
685 sb->map[0] = sdev->screen_base;
686
687 return 0;
688}
689
690static const struct drm_plane_helper_funcs simpledrm_primary_plane_helper_funcs = {
691 DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
692 .atomic_check = simpledrm_primary_plane_helper_atomic_check,
693 .atomic_update = simpledrm_primary_plane_helper_atomic_update,
694 .atomic_disable = simpledrm_primary_plane_helper_atomic_disable,
695 .get_scanout_buffer = simpledrm_primary_plane_helper_get_scanout_buffer,
696};
697
698static const struct drm_plane_funcs simpledrm_primary_plane_funcs = {
699 .update_plane = drm_atomic_helper_update_plane,
700 .disable_plane = drm_atomic_helper_disable_plane,
701 .destroy = drm_plane_cleanup,
702 DRM_GEM_SHADOW_PLANE_FUNCS,
703};
704
705static enum drm_mode_status simpledrm_crtc_helper_mode_valid(struct drm_crtc *crtc,
706 const struct drm_display_mode *mode)
707{
708 struct simpledrm_device *sdev = simpledrm_device_of_dev(crtc->dev);
709
710 return drm_crtc_helper_mode_valid_fixed(crtc, mode, &sdev->mode);
711}
712
713/*
714 * The CRTC is always enabled. Screen updates are performed by
715 * the primary plane's atomic_update function. Disabling clears
716 * the screen in the primary plane's atomic_disable function.
717 */
718static const struct drm_crtc_helper_funcs simpledrm_crtc_helper_funcs = {
719 .mode_valid = simpledrm_crtc_helper_mode_valid,
720 .atomic_check = drm_crtc_helper_atomic_check,
721};
722
723static const struct drm_crtc_funcs simpledrm_crtc_funcs = {
724 .reset = drm_atomic_helper_crtc_reset,
725 .destroy = drm_crtc_cleanup,
726 .set_config = drm_atomic_helper_set_config,
727 .page_flip = drm_atomic_helper_page_flip,
728 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
729 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
730};
731
732static const struct drm_encoder_funcs simpledrm_encoder_funcs = {
733 .destroy = drm_encoder_cleanup,
734};
735
736static int simpledrm_connector_helper_get_modes(struct drm_connector *connector)
737{
738 struct simpledrm_device *sdev = simpledrm_device_of_dev(connector->dev);
739
740 return drm_connector_helper_get_modes_fixed(connector, &sdev->mode);
741}
742
743static const struct drm_connector_helper_funcs simpledrm_connector_helper_funcs = {
744 .get_modes = simpledrm_connector_helper_get_modes,
745};
746
747static const struct drm_connector_funcs simpledrm_connector_funcs = {
748 .reset = drm_atomic_helper_connector_reset,
749 .fill_modes = drm_helper_probe_single_connector_modes,
750 .destroy = drm_connector_cleanup,
751 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
752 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
753};
754
755static const struct drm_mode_config_funcs simpledrm_mode_config_funcs = {
756 .fb_create = drm_gem_fb_create_with_dirty,
757 .atomic_check = drm_atomic_helper_check,
758 .atomic_commit = drm_atomic_helper_commit,
759};
760
761/*
762 * Init / Cleanup
763 */
764
765static struct drm_display_mode simpledrm_mode(unsigned int width,
766 unsigned int height,
767 unsigned int width_mm,
768 unsigned int height_mm)
769{
770 const struct drm_display_mode mode = {
771 DRM_MODE_INIT(60, width, height, width_mm, height_mm)
772 };
773
774 return mode;
775}
776
777static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv,
778 struct platform_device *pdev)
779{
780 const struct simplefb_platform_data *pd = dev_get_platdata(&pdev->dev);
781 struct device_node *of_node = pdev->dev.of_node;
782 struct simpledrm_device *sdev;
783 struct drm_device *dev;
784 int width, height, stride;
785 int width_mm = 0, height_mm = 0;
786 struct device_node *panel_node;
787 const struct drm_format_info *format;
788 struct resource *res, *mem = NULL;
789 struct drm_plane *primary_plane;
790 struct drm_crtc *crtc;
791 struct drm_encoder *encoder;
792 struct drm_connector *connector;
793 unsigned long max_width, max_height;
794 size_t nformats;
795 int ret;
796
797 sdev = devm_drm_dev_alloc(&pdev->dev, drv, struct simpledrm_device, dev);
798 if (IS_ERR(sdev))
799 return ERR_CAST(sdev);
800 dev = &sdev->dev;
801 platform_set_drvdata(pdev, sdev);
802
803 /*
804 * Hardware settings
805 */
806
807 ret = simpledrm_device_init_clocks(sdev);
808 if (ret)
809 return ERR_PTR(ret);
810 ret = simpledrm_device_init_regulators(sdev);
811 if (ret)
812 return ERR_PTR(ret);
813 ret = simpledrm_device_attach_genpd(sdev);
814 if (ret)
815 return ERR_PTR(ret);
816
817 if (pd) {
818 width = simplefb_get_width_pd(dev, pd);
819 if (width < 0)
820 return ERR_PTR(width);
821 height = simplefb_get_height_pd(dev, pd);
822 if (height < 0)
823 return ERR_PTR(height);
824 stride = simplefb_get_stride_pd(dev, pd);
825 if (stride < 0)
826 return ERR_PTR(stride);
827 format = simplefb_get_format_pd(dev, pd);
828 if (IS_ERR(format))
829 return ERR_CAST(format);
830 } else if (of_node) {
831 width = simplefb_get_width_of(dev, of_node);
832 if (width < 0)
833 return ERR_PTR(width);
834 height = simplefb_get_height_of(dev, of_node);
835 if (height < 0)
836 return ERR_PTR(height);
837 stride = simplefb_get_stride_of(dev, of_node);
838 if (stride < 0)
839 return ERR_PTR(stride);
840 format = simplefb_get_format_of(dev, of_node);
841 if (IS_ERR(format))
842 return ERR_CAST(format);
843 mem = simplefb_get_memory_of(dev, of_node);
844 if (IS_ERR(mem))
845 return ERR_CAST(mem);
846 panel_node = of_parse_phandle(of_node, "panel", 0);
847 if (panel_node) {
848 simplefb_read_u32_of(dev, panel_node, "width-mm", &width_mm);
849 simplefb_read_u32_of(dev, panel_node, "height-mm", &height_mm);
850 of_node_put(panel_node);
851 }
852 } else {
853 drm_err(dev, "no simplefb configuration found\n");
854 return ERR_PTR(-ENODEV);
855 }
856 if (!stride) {
857 stride = drm_format_info_min_pitch(format, 0, width);
858 if (drm_WARN_ON(dev, !stride))
859 return ERR_PTR(-EINVAL);
860 }
861
862 /*
863 * Assume a monitor resolution of 96 dpi if physical dimensions
864 * are not specified to get a somewhat reasonable screen size.
865 */
866 if (!width_mm)
867 width_mm = DRM_MODE_RES_MM(width, 96ul);
868 if (!height_mm)
869 height_mm = DRM_MODE_RES_MM(height, 96ul);
870
871 sdev->mode = simpledrm_mode(width, height, width_mm, height_mm);
872 sdev->format = format;
873 sdev->pitch = stride;
874
875 drm_dbg(dev, "display mode={" DRM_MODE_FMT "}\n", DRM_MODE_ARG(&sdev->mode));
876 drm_dbg(dev, "framebuffer format=%p4cc, size=%dx%d, stride=%d byte\n",
877 &format->format, width, height, stride);
878
879 /*
880 * Memory management
881 */
882
883 if (mem) {
884 void *screen_base;
885
886 ret = devm_aperture_acquire_for_platform_device(pdev, mem->start,
887 resource_size(mem));
888 if (ret) {
889 drm_err(dev, "could not acquire memory range %pr: %d\n", mem, ret);
890 return ERR_PTR(ret);
891 }
892
893 drm_dbg(dev, "using system memory framebuffer at %pr\n", mem);
894
895 screen_base = devm_memremap(dev->dev, mem->start, resource_size(mem), MEMREMAP_WC);
896 if (IS_ERR(screen_base))
897 return screen_base;
898
899 iosys_map_set_vaddr(&sdev->screen_base, screen_base);
900 } else {
901 void __iomem *screen_base;
902
903 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
904 if (!res)
905 return ERR_PTR(-EINVAL);
906
907 ret = devm_aperture_acquire_for_platform_device(pdev, res->start,
908 resource_size(res));
909 if (ret) {
910 drm_err(dev, "could not acquire memory range %pr: %d\n", res, ret);
911 return ERR_PTR(ret);
912 }
913
914 drm_dbg(dev, "using I/O memory framebuffer at %pr\n", res);
915
916 mem = devm_request_mem_region(&pdev->dev, res->start, resource_size(res),
917 drv->name);
918 if (!mem) {
919 /*
920 * We cannot make this fatal. Sometimes this comes from magic
921 * spaces our resource handlers simply don't know about. Use
922 * the I/O-memory resource as-is and try to map that instead.
923 */
924 drm_warn(dev, "could not acquire memory region %pr\n", res);
925 mem = res;
926 }
927
928 screen_base = devm_ioremap_wc(&pdev->dev, mem->start, resource_size(mem));
929 if (!screen_base)
930 return ERR_PTR(-ENOMEM);
931
932 iosys_map_set_vaddr_iomem(&sdev->screen_base, screen_base);
933 }
934
935 /*
936 * Modesetting
937 */
938
939 ret = drmm_mode_config_init(dev);
940 if (ret)
941 return ERR_PTR(ret);
942
943 max_width = max_t(unsigned long, width, DRM_SHADOW_PLANE_MAX_WIDTH);
944 max_height = max_t(unsigned long, height, DRM_SHADOW_PLANE_MAX_HEIGHT);
945
946 dev->mode_config.min_width = width;
947 dev->mode_config.max_width = max_width;
948 dev->mode_config.min_height = height;
949 dev->mode_config.max_height = max_height;
950 dev->mode_config.preferred_depth = format->depth;
951 dev->mode_config.funcs = &simpledrm_mode_config_funcs;
952
953 /* Primary plane */
954
955 nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
956 sdev->formats, ARRAY_SIZE(sdev->formats));
957
958 primary_plane = &sdev->primary_plane;
959 ret = drm_universal_plane_init(dev, primary_plane, 0, &simpledrm_primary_plane_funcs,
960 sdev->formats, nformats,
961 simpledrm_primary_plane_format_modifiers,
962 DRM_PLANE_TYPE_PRIMARY, NULL);
963 if (ret)
964 return ERR_PTR(ret);
965 drm_plane_helper_add(primary_plane, &simpledrm_primary_plane_helper_funcs);
966 drm_plane_enable_fb_damage_clips(primary_plane);
967
968 /* CRTC */
969
970 crtc = &sdev->crtc;
971 ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
972 &simpledrm_crtc_funcs, NULL);
973 if (ret)
974 return ERR_PTR(ret);
975 drm_crtc_helper_add(crtc, &simpledrm_crtc_helper_funcs);
976
977 /* Encoder */
978
979 encoder = &sdev->encoder;
980 ret = drm_encoder_init(dev, encoder, &simpledrm_encoder_funcs,
981 DRM_MODE_ENCODER_NONE, NULL);
982 if (ret)
983 return ERR_PTR(ret);
984 encoder->possible_crtcs = drm_crtc_mask(crtc);
985
986 /* Connector */
987
988 connector = &sdev->connector;
989 ret = drm_connector_init(dev, connector, &simpledrm_connector_funcs,
990 DRM_MODE_CONNECTOR_Unknown);
991 if (ret)
992 return ERR_PTR(ret);
993 drm_connector_helper_add(connector, &simpledrm_connector_helper_funcs);
994 drm_connector_set_panel_orientation_with_quirk(connector,
995 DRM_MODE_PANEL_ORIENTATION_UNKNOWN,
996 width, height);
997
998 ret = drm_connector_attach_encoder(connector, encoder);
999 if (ret)
1000 return ERR_PTR(ret);
1001
1002 drm_mode_config_reset(dev);
1003
1004 return sdev;
1005}
1006
1007/*
1008 * DRM driver
1009 */
1010
1011DEFINE_DRM_GEM_FOPS(simpledrm_fops);
1012
1013static struct drm_driver simpledrm_driver = {
1014 DRM_GEM_SHMEM_DRIVER_OPS,
1015 DRM_FBDEV_SHMEM_DRIVER_OPS,
1016 .name = DRIVER_NAME,
1017 .desc = DRIVER_DESC,
1018 .date = DRIVER_DATE,
1019 .major = DRIVER_MAJOR,
1020 .minor = DRIVER_MINOR,
1021 .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
1022 .fops = &simpledrm_fops,
1023};
1024
1025/*
1026 * Platform driver
1027 */
1028
1029static int simpledrm_probe(struct platform_device *pdev)
1030{
1031 struct simpledrm_device *sdev;
1032 struct drm_device *dev;
1033 int ret;
1034
1035 sdev = simpledrm_device_create(&simpledrm_driver, pdev);
1036 if (IS_ERR(sdev))
1037 return PTR_ERR(sdev);
1038 dev = &sdev->dev;
1039
1040 ret = drm_dev_register(dev, 0);
1041 if (ret)
1042 return ret;
1043
1044 drm_client_setup(dev, sdev->format);
1045
1046 return 0;
1047}
1048
1049static void simpledrm_remove(struct platform_device *pdev)
1050{
1051 struct simpledrm_device *sdev = platform_get_drvdata(pdev);
1052 struct drm_device *dev = &sdev->dev;
1053
1054 drm_dev_unplug(dev);
1055}
1056
1057static const struct of_device_id simpledrm_of_match_table[] = {
1058 { .compatible = "simple-framebuffer", },
1059 { },
1060};
1061MODULE_DEVICE_TABLE(of, simpledrm_of_match_table);
1062
1063static struct platform_driver simpledrm_platform_driver = {
1064 .driver = {
1065 .name = "simple-framebuffer", /* connect to sysfb */
1066 .of_match_table = simpledrm_of_match_table,
1067 },
1068 .probe = simpledrm_probe,
1069 .remove = simpledrm_remove,
1070};
1071
1072module_platform_driver(simpledrm_platform_driver);
1073
1074MODULE_DESCRIPTION(DRIVER_DESC);
1075MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/clk.h>
4#include <linux/of_clk.h>
5#include <linux/minmax.h>
6#include <linux/of_address.h>
7#include <linux/platform_data/simplefb.h>
8#include <linux/platform_device.h>
9#include <linux/pm_domain.h>
10#include <linux/regulator/consumer.h>
11
12#include <drm/drm_aperture.h>
13#include <drm/drm_atomic.h>
14#include <drm/drm_atomic_state_helper.h>
15#include <drm/drm_connector.h>
16#include <drm/drm_crtc_helper.h>
17#include <drm/drm_damage_helper.h>
18#include <drm/drm_device.h>
19#include <drm/drm_drv.h>
20#include <drm/drm_fbdev_generic.h>
21#include <drm/drm_format_helper.h>
22#include <drm/drm_framebuffer.h>
23#include <drm/drm_gem_atomic_helper.h>
24#include <drm/drm_gem_framebuffer_helper.h>
25#include <drm/drm_gem_shmem_helper.h>
26#include <drm/drm_managed.h>
27#include <drm/drm_modeset_helper_vtables.h>
28#include <drm/drm_probe_helper.h>
29
30#define DRIVER_NAME "simpledrm"
31#define DRIVER_DESC "DRM driver for simple-framebuffer platform devices"
32#define DRIVER_DATE "20200625"
33#define DRIVER_MAJOR 1
34#define DRIVER_MINOR 0
35
36/*
37 * Helpers for simplefb
38 */
39
40static int
41simplefb_get_validated_int(struct drm_device *dev, const char *name,
42 uint32_t value)
43{
44 if (value > INT_MAX) {
45 drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
46 name, value);
47 return -EINVAL;
48 }
49 return (int)value;
50}
51
52static int
53simplefb_get_validated_int0(struct drm_device *dev, const char *name,
54 uint32_t value)
55{
56 if (!value) {
57 drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
58 name, value);
59 return -EINVAL;
60 }
61 return simplefb_get_validated_int(dev, name, value);
62}
63
64static const struct drm_format_info *
65simplefb_get_validated_format(struct drm_device *dev, const char *format_name)
66{
67 static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;
68 const struct simplefb_format *fmt = formats;
69 const struct simplefb_format *end = fmt + ARRAY_SIZE(formats);
70 const struct drm_format_info *info;
71
72 if (!format_name) {
73 drm_err(dev, "simplefb: missing framebuffer format\n");
74 return ERR_PTR(-EINVAL);
75 }
76
77 while (fmt < end) {
78 if (!strcmp(format_name, fmt->name)) {
79 info = drm_format_info(fmt->fourcc);
80 if (!info)
81 return ERR_PTR(-EINVAL);
82 return info;
83 }
84 ++fmt;
85 }
86
87 drm_err(dev, "simplefb: unknown framebuffer format %s\n",
88 format_name);
89
90 return ERR_PTR(-EINVAL);
91}
92
93static int
94simplefb_get_width_pd(struct drm_device *dev,
95 const struct simplefb_platform_data *pd)
96{
97 return simplefb_get_validated_int0(dev, "width", pd->width);
98}
99
100static int
101simplefb_get_height_pd(struct drm_device *dev,
102 const struct simplefb_platform_data *pd)
103{
104 return simplefb_get_validated_int0(dev, "height", pd->height);
105}
106
107static int
108simplefb_get_stride_pd(struct drm_device *dev,
109 const struct simplefb_platform_data *pd)
110{
111 return simplefb_get_validated_int(dev, "stride", pd->stride);
112}
113
114static const struct drm_format_info *
115simplefb_get_format_pd(struct drm_device *dev,
116 const struct simplefb_platform_data *pd)
117{
118 return simplefb_get_validated_format(dev, pd->format);
119}
120
121static int
122simplefb_read_u32_of(struct drm_device *dev, struct device_node *of_node,
123 const char *name, u32 *value)
124{
125 int ret = of_property_read_u32(of_node, name, value);
126
127 if (ret)
128 drm_err(dev, "simplefb: cannot parse framebuffer %s: error %d\n",
129 name, ret);
130 return ret;
131}
132
133static int
134simplefb_read_string_of(struct drm_device *dev, struct device_node *of_node,
135 const char *name, const char **value)
136{
137 int ret = of_property_read_string(of_node, name, value);
138
139 if (ret)
140 drm_err(dev, "simplefb: cannot parse framebuffer %s: error %d\n",
141 name, ret);
142 return ret;
143}
144
145static int
146simplefb_get_width_of(struct drm_device *dev, struct device_node *of_node)
147{
148 u32 width;
149 int ret = simplefb_read_u32_of(dev, of_node, "width", &width);
150
151 if (ret)
152 return ret;
153 return simplefb_get_validated_int0(dev, "width", width);
154}
155
156static int
157simplefb_get_height_of(struct drm_device *dev, struct device_node *of_node)
158{
159 u32 height;
160 int ret = simplefb_read_u32_of(dev, of_node, "height", &height);
161
162 if (ret)
163 return ret;
164 return simplefb_get_validated_int0(dev, "height", height);
165}
166
167static int
168simplefb_get_stride_of(struct drm_device *dev, struct device_node *of_node)
169{
170 u32 stride;
171 int ret = simplefb_read_u32_of(dev, of_node, "stride", &stride);
172
173 if (ret)
174 return ret;
175 return simplefb_get_validated_int(dev, "stride", stride);
176}
177
178static const struct drm_format_info *
179simplefb_get_format_of(struct drm_device *dev, struct device_node *of_node)
180{
181 const char *format;
182 int ret = simplefb_read_string_of(dev, of_node, "format", &format);
183
184 if (ret)
185 return ERR_PTR(ret);
186 return simplefb_get_validated_format(dev, format);
187}
188
189static struct resource *
190simplefb_get_memory_of(struct drm_device *dev, struct device_node *of_node)
191{
192 struct device_node *np;
193 struct resource *res;
194 int err;
195
196 np = of_parse_phandle(of_node, "memory-region", 0);
197 if (!np)
198 return NULL;
199
200 res = devm_kzalloc(dev->dev, sizeof(*res), GFP_KERNEL);
201 if (!res)
202 return ERR_PTR(-ENOMEM);
203
204 err = of_address_to_resource(np, 0, res);
205 if (err)
206 return ERR_PTR(err);
207
208 if (of_property_present(of_node, "reg"))
209 drm_warn(dev, "preferring \"memory-region\" over \"reg\" property\n");
210
211 return res;
212}
213
214/*
215 * Simple Framebuffer device
216 */
217
218struct simpledrm_device {
219 struct drm_device dev;
220
221 /* clocks */
222#if defined CONFIG_OF && defined CONFIG_COMMON_CLK
223 unsigned int clk_count;
224 struct clk **clks;
225#endif
226 /* regulators */
227#if defined CONFIG_OF && defined CONFIG_REGULATOR
228 unsigned int regulator_count;
229 struct regulator **regulators;
230#endif
231 /* power-domains */
232#if defined CONFIG_OF && defined CONFIG_PM_GENERIC_DOMAINS
233 int pwr_dom_count;
234 struct device **pwr_dom_devs;
235 struct device_link **pwr_dom_links;
236#endif
237
238 /* simplefb settings */
239 struct drm_display_mode mode;
240 const struct drm_format_info *format;
241 unsigned int pitch;
242
243 /* memory management */
244 struct iosys_map screen_base;
245
246 /* modesetting */
247 uint32_t formats[8];
248 size_t nformats;
249 struct drm_plane primary_plane;
250 struct drm_crtc crtc;
251 struct drm_encoder encoder;
252 struct drm_connector connector;
253};
254
255static struct simpledrm_device *simpledrm_device_of_dev(struct drm_device *dev)
256{
257 return container_of(dev, struct simpledrm_device, dev);
258}
259
260/*
261 * Hardware
262 */
263
264#if defined CONFIG_OF && defined CONFIG_COMMON_CLK
265/*
266 * Clock handling code.
267 *
268 * Here we handle the clocks property of our "simple-framebuffer" dt node.
269 * This is necessary so that we can make sure that any clocks needed by
270 * the display engine that the bootloader set up for us (and for which it
271 * provided a simplefb dt node), stay up, for the life of the simplefb
272 * driver.
273 *
274 * When the driver unloads, we cleanly disable, and then release the clocks.
275 *
276 * We only complain about errors here, no action is taken as the most likely
277 * error can only happen due to a mismatch between the bootloader which set
278 * up simplefb, and the clock definitions in the device tree. Chances are
279 * that there are no adverse effects, and if there are, a clean teardown of
280 * the fb probe will not help us much either. So just complain and carry on,
281 * and hope that the user actually gets a working fb at the end of things.
282 */
283
284static void simpledrm_device_release_clocks(void *res)
285{
286 struct simpledrm_device *sdev = simpledrm_device_of_dev(res);
287 unsigned int i;
288
289 for (i = 0; i < sdev->clk_count; ++i) {
290 if (sdev->clks[i]) {
291 clk_disable_unprepare(sdev->clks[i]);
292 clk_put(sdev->clks[i]);
293 }
294 }
295}
296
297static int simpledrm_device_init_clocks(struct simpledrm_device *sdev)
298{
299 struct drm_device *dev = &sdev->dev;
300 struct platform_device *pdev = to_platform_device(dev->dev);
301 struct device_node *of_node = pdev->dev.of_node;
302 struct clk *clock;
303 unsigned int i;
304 int ret;
305
306 if (dev_get_platdata(&pdev->dev) || !of_node)
307 return 0;
308
309 sdev->clk_count = of_clk_get_parent_count(of_node);
310 if (!sdev->clk_count)
311 return 0;
312
313 sdev->clks = drmm_kzalloc(dev, sdev->clk_count * sizeof(sdev->clks[0]),
314 GFP_KERNEL);
315 if (!sdev->clks)
316 return -ENOMEM;
317
318 for (i = 0; i < sdev->clk_count; ++i) {
319 clock = of_clk_get(of_node, i);
320 if (IS_ERR(clock)) {
321 ret = PTR_ERR(clock);
322 if (ret == -EPROBE_DEFER)
323 goto err;
324 drm_err(dev, "clock %u not found: %d\n", i, ret);
325 continue;
326 }
327 ret = clk_prepare_enable(clock);
328 if (ret) {
329 drm_err(dev, "failed to enable clock %u: %d\n",
330 i, ret);
331 clk_put(clock);
332 continue;
333 }
334 sdev->clks[i] = clock;
335 }
336
337 return devm_add_action_or_reset(&pdev->dev,
338 simpledrm_device_release_clocks,
339 sdev);
340
341err:
342 while (i) {
343 --i;
344 if (sdev->clks[i]) {
345 clk_disable_unprepare(sdev->clks[i]);
346 clk_put(sdev->clks[i]);
347 }
348 }
349 return ret;
350}
351#else
352static int simpledrm_device_init_clocks(struct simpledrm_device *sdev)
353{
354 return 0;
355}
356#endif
357
358#if defined CONFIG_OF && defined CONFIG_REGULATOR
359
360#define SUPPLY_SUFFIX "-supply"
361
362/*
363 * Regulator handling code.
364 *
365 * Here we handle the num-supplies and vin*-supply properties of our
366 * "simple-framebuffer" dt node. This is necessary so that we can make sure
367 * that any regulators needed by the display hardware that the bootloader
368 * set up for us (and for which it provided a simplefb dt node), stay up,
369 * for the life of the simplefb driver.
370 *
371 * When the driver unloads, we cleanly disable, and then release the
372 * regulators.
373 *
374 * We only complain about errors here, no action is taken as the most likely
375 * error can only happen due to a mismatch between the bootloader which set
376 * up simplefb, and the regulator definitions in the device tree. Chances are
377 * that there are no adverse effects, and if there are, a clean teardown of
378 * the fb probe will not help us much either. So just complain and carry on,
379 * and hope that the user actually gets a working fb at the end of things.
380 */
381
382static void simpledrm_device_release_regulators(void *res)
383{
384 struct simpledrm_device *sdev = simpledrm_device_of_dev(res);
385 unsigned int i;
386
387 for (i = 0; i < sdev->regulator_count; ++i) {
388 if (sdev->regulators[i]) {
389 regulator_disable(sdev->regulators[i]);
390 regulator_put(sdev->regulators[i]);
391 }
392 }
393}
394
395static int simpledrm_device_init_regulators(struct simpledrm_device *sdev)
396{
397 struct drm_device *dev = &sdev->dev;
398 struct platform_device *pdev = to_platform_device(dev->dev);
399 struct device_node *of_node = pdev->dev.of_node;
400 struct property *prop;
401 struct regulator *regulator;
402 const char *p;
403 unsigned int count = 0, i = 0;
404 int ret;
405
406 if (dev_get_platdata(&pdev->dev) || !of_node)
407 return 0;
408
409 /* Count the number of regulator supplies */
410 for_each_property_of_node(of_node, prop) {
411 p = strstr(prop->name, SUPPLY_SUFFIX);
412 if (p && p != prop->name)
413 ++count;
414 }
415
416 if (!count)
417 return 0;
418
419 sdev->regulators = drmm_kzalloc(dev,
420 count * sizeof(sdev->regulators[0]),
421 GFP_KERNEL);
422 if (!sdev->regulators)
423 return -ENOMEM;
424
425 for_each_property_of_node(of_node, prop) {
426 char name[32]; /* 32 is max size of property name */
427 size_t len;
428
429 p = strstr(prop->name, SUPPLY_SUFFIX);
430 if (!p || p == prop->name)
431 continue;
432 len = strlen(prop->name) - strlen(SUPPLY_SUFFIX) + 1;
433 strscpy(name, prop->name, min(sizeof(name), len));
434
435 regulator = regulator_get_optional(&pdev->dev, name);
436 if (IS_ERR(regulator)) {
437 ret = PTR_ERR(regulator);
438 if (ret == -EPROBE_DEFER)
439 goto err;
440 drm_err(dev, "regulator %s not found: %d\n",
441 name, ret);
442 continue;
443 }
444
445 ret = regulator_enable(regulator);
446 if (ret) {
447 drm_err(dev, "failed to enable regulator %u: %d\n",
448 i, ret);
449 regulator_put(regulator);
450 continue;
451 }
452
453 sdev->regulators[i++] = regulator;
454 }
455 sdev->regulator_count = i;
456
457 return devm_add_action_or_reset(&pdev->dev,
458 simpledrm_device_release_regulators,
459 sdev);
460
461err:
462 while (i) {
463 --i;
464 if (sdev->regulators[i]) {
465 regulator_disable(sdev->regulators[i]);
466 regulator_put(sdev->regulators[i]);
467 }
468 }
469 return ret;
470}
471#else
472static int simpledrm_device_init_regulators(struct simpledrm_device *sdev)
473{
474 return 0;
475}
476#endif
477
478#if defined CONFIG_OF && defined CONFIG_PM_GENERIC_DOMAINS
479/*
480 * Generic power domain handling code.
481 *
482 * Here we handle the power-domains properties of our "simple-framebuffer"
483 * dt node. This is only necessary if there is more than one power-domain.
484 * A single power-domains is handled automatically by the driver core. Multiple
485 * power-domains have to be handled by drivers since the driver core can't know
486 * the correct power sequencing. Power sequencing is not an issue for simpledrm
487 * since the bootloader has put the power domains already in the correct state.
488 * simpledrm has only to ensure they remain active for its lifetime.
489 *
490 * When the driver unloads, we detach from the power-domains.
491 *
492 * We only complain about errors here, no action is taken as the most likely
493 * error can only happen due to a mismatch between the bootloader which set
494 * up the "simple-framebuffer" dt node, and the PM domain providers in the
495 * device tree. Chances are that there are no adverse effects, and if there are,
496 * a clean teardown of the fb probe will not help us much either. So just
497 * complain and carry on, and hope that the user actually gets a working fb at
498 * the end of things.
499 */
500static void simpledrm_device_detach_genpd(void *res)
501{
502 int i;
503 struct simpledrm_device *sdev = res;
504
505 if (sdev->pwr_dom_count <= 1)
506 return;
507
508 for (i = sdev->pwr_dom_count - 1; i >= 0; i--) {
509 if (sdev->pwr_dom_links[i])
510 device_link_del(sdev->pwr_dom_links[i]);
511 if (!IS_ERR_OR_NULL(sdev->pwr_dom_devs[i]))
512 dev_pm_domain_detach(sdev->pwr_dom_devs[i], true);
513 }
514}
515
516static int simpledrm_device_attach_genpd(struct simpledrm_device *sdev)
517{
518 struct device *dev = sdev->dev.dev;
519 int i;
520
521 sdev->pwr_dom_count = of_count_phandle_with_args(dev->of_node, "power-domains",
522 "#power-domain-cells");
523 /*
524 * Single power-domain devices are handled by driver core nothing to do
525 * here. The same for device nodes without "power-domains" property.
526 */
527 if (sdev->pwr_dom_count <= 1)
528 return 0;
529
530 sdev->pwr_dom_devs = devm_kcalloc(dev, sdev->pwr_dom_count,
531 sizeof(*sdev->pwr_dom_devs),
532 GFP_KERNEL);
533 if (!sdev->pwr_dom_devs)
534 return -ENOMEM;
535
536 sdev->pwr_dom_links = devm_kcalloc(dev, sdev->pwr_dom_count,
537 sizeof(*sdev->pwr_dom_links),
538 GFP_KERNEL);
539 if (!sdev->pwr_dom_links)
540 return -ENOMEM;
541
542 for (i = 0; i < sdev->pwr_dom_count; i++) {
543 sdev->pwr_dom_devs[i] = dev_pm_domain_attach_by_id(dev, i);
544 if (IS_ERR(sdev->pwr_dom_devs[i])) {
545 int ret = PTR_ERR(sdev->pwr_dom_devs[i]);
546 if (ret == -EPROBE_DEFER) {
547 simpledrm_device_detach_genpd(sdev);
548 return ret;
549 }
550 drm_warn(&sdev->dev,
551 "pm_domain_attach_by_id(%u) failed: %d\n", i, ret);
552 continue;
553 }
554
555 sdev->pwr_dom_links[i] = device_link_add(dev,
556 sdev->pwr_dom_devs[i],
557 DL_FLAG_STATELESS |
558 DL_FLAG_PM_RUNTIME |
559 DL_FLAG_RPM_ACTIVE);
560 if (!sdev->pwr_dom_links[i])
561 drm_warn(&sdev->dev, "failed to link power-domain %d\n", i);
562 }
563
564 return devm_add_action_or_reset(dev, simpledrm_device_detach_genpd, sdev);
565}
566#else
567static int simpledrm_device_attach_genpd(struct simpledrm_device *sdev)
568{
569 return 0;
570}
571#endif
572
573/*
574 * Modesetting
575 */
576
577static const uint64_t simpledrm_primary_plane_format_modifiers[] = {
578 DRM_FORMAT_MOD_LINEAR,
579 DRM_FORMAT_MOD_INVALID
580};
581
582static int simpledrm_primary_plane_helper_atomic_check(struct drm_plane *plane,
583 struct drm_atomic_state *state)
584{
585 struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
586 struct drm_shadow_plane_state *new_shadow_plane_state =
587 to_drm_shadow_plane_state(new_plane_state);
588 struct drm_framebuffer *new_fb = new_plane_state->fb;
589 struct drm_crtc *new_crtc = new_plane_state->crtc;
590 struct drm_crtc_state *new_crtc_state = NULL;
591 struct drm_device *dev = plane->dev;
592 struct simpledrm_device *sdev = simpledrm_device_of_dev(dev);
593 int ret;
594
595 if (new_crtc)
596 new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
597
598 ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
599 DRM_PLANE_NO_SCALING,
600 DRM_PLANE_NO_SCALING,
601 false, false);
602 if (ret)
603 return ret;
604 else if (!new_plane_state->visible)
605 return 0;
606
607 if (new_fb->format != sdev->format) {
608 void *buf;
609
610 /* format conversion necessary; reserve buffer */
611 buf = drm_format_conv_state_reserve(&new_shadow_plane_state->fmtcnv_state,
612 sdev->pitch, GFP_KERNEL);
613 if (!buf)
614 return -ENOMEM;
615 }
616
617 return 0;
618}
619
620static void simpledrm_primary_plane_helper_atomic_update(struct drm_plane *plane,
621 struct drm_atomic_state *state)
622{
623 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
624 struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
625 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
626 struct drm_framebuffer *fb = plane_state->fb;
627 struct drm_device *dev = plane->dev;
628 struct simpledrm_device *sdev = simpledrm_device_of_dev(dev);
629 struct drm_atomic_helper_damage_iter iter;
630 struct drm_rect damage;
631 int ret, idx;
632
633 ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
634 if (ret)
635 return;
636
637 if (!drm_dev_enter(dev, &idx))
638 goto out_drm_gem_fb_end_cpu_access;
639
640 drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
641 drm_atomic_for_each_plane_damage(&iter, &damage) {
642 struct drm_rect dst_clip = plane_state->dst;
643 struct iosys_map dst = sdev->screen_base;
644
645 if (!drm_rect_intersect(&dst_clip, &damage))
646 continue;
647
648 iosys_map_incr(&dst, drm_fb_clip_offset(sdev->pitch, sdev->format, &dst_clip));
649 drm_fb_blit(&dst, &sdev->pitch, sdev->format->format, shadow_plane_state->data,
650 fb, &damage, &shadow_plane_state->fmtcnv_state);
651 }
652
653 drm_dev_exit(idx);
654out_drm_gem_fb_end_cpu_access:
655 drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
656}
657
658static void simpledrm_primary_plane_helper_atomic_disable(struct drm_plane *plane,
659 struct drm_atomic_state *state)
660{
661 struct drm_device *dev = plane->dev;
662 struct simpledrm_device *sdev = simpledrm_device_of_dev(dev);
663 int idx;
664
665 if (!drm_dev_enter(dev, &idx))
666 return;
667
668 /* Clear screen to black if disabled */
669 iosys_map_memset(&sdev->screen_base, 0, 0, sdev->pitch * sdev->mode.vdisplay);
670
671 drm_dev_exit(idx);
672}
673
674static const struct drm_plane_helper_funcs simpledrm_primary_plane_helper_funcs = {
675 DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
676 .atomic_check = simpledrm_primary_plane_helper_atomic_check,
677 .atomic_update = simpledrm_primary_plane_helper_atomic_update,
678 .atomic_disable = simpledrm_primary_plane_helper_atomic_disable,
679};
680
681static const struct drm_plane_funcs simpledrm_primary_plane_funcs = {
682 .update_plane = drm_atomic_helper_update_plane,
683 .disable_plane = drm_atomic_helper_disable_plane,
684 .destroy = drm_plane_cleanup,
685 DRM_GEM_SHADOW_PLANE_FUNCS,
686};
687
688static enum drm_mode_status simpledrm_crtc_helper_mode_valid(struct drm_crtc *crtc,
689 const struct drm_display_mode *mode)
690{
691 struct simpledrm_device *sdev = simpledrm_device_of_dev(crtc->dev);
692
693 return drm_crtc_helper_mode_valid_fixed(crtc, mode, &sdev->mode);
694}
695
696/*
697 * The CRTC is always enabled. Screen updates are performed by
698 * the primary plane's atomic_update function. Disabling clears
699 * the screen in the primary plane's atomic_disable function.
700 */
701static const struct drm_crtc_helper_funcs simpledrm_crtc_helper_funcs = {
702 .mode_valid = simpledrm_crtc_helper_mode_valid,
703 .atomic_check = drm_crtc_helper_atomic_check,
704};
705
706static const struct drm_crtc_funcs simpledrm_crtc_funcs = {
707 .reset = drm_atomic_helper_crtc_reset,
708 .destroy = drm_crtc_cleanup,
709 .set_config = drm_atomic_helper_set_config,
710 .page_flip = drm_atomic_helper_page_flip,
711 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
712 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
713};
714
715static const struct drm_encoder_funcs simpledrm_encoder_funcs = {
716 .destroy = drm_encoder_cleanup,
717};
718
719static int simpledrm_connector_helper_get_modes(struct drm_connector *connector)
720{
721 struct simpledrm_device *sdev = simpledrm_device_of_dev(connector->dev);
722
723 return drm_connector_helper_get_modes_fixed(connector, &sdev->mode);
724}
725
726static const struct drm_connector_helper_funcs simpledrm_connector_helper_funcs = {
727 .get_modes = simpledrm_connector_helper_get_modes,
728};
729
730static const struct drm_connector_funcs simpledrm_connector_funcs = {
731 .reset = drm_atomic_helper_connector_reset,
732 .fill_modes = drm_helper_probe_single_connector_modes,
733 .destroy = drm_connector_cleanup,
734 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
735 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
736};
737
738static const struct drm_mode_config_funcs simpledrm_mode_config_funcs = {
739 .fb_create = drm_gem_fb_create_with_dirty,
740 .atomic_check = drm_atomic_helper_check,
741 .atomic_commit = drm_atomic_helper_commit,
742};
743
744/*
745 * Init / Cleanup
746 */
747
748static struct drm_display_mode simpledrm_mode(unsigned int width,
749 unsigned int height,
750 unsigned int width_mm,
751 unsigned int height_mm)
752{
753 const struct drm_display_mode mode = {
754 DRM_MODE_INIT(60, width, height, width_mm, height_mm)
755 };
756
757 return mode;
758}
759
760static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv,
761 struct platform_device *pdev)
762{
763 const struct simplefb_platform_data *pd = dev_get_platdata(&pdev->dev);
764 struct device_node *of_node = pdev->dev.of_node;
765 struct simpledrm_device *sdev;
766 struct drm_device *dev;
767 int width, height, stride;
768 int width_mm = 0, height_mm = 0;
769 struct device_node *panel_node;
770 const struct drm_format_info *format;
771 struct resource *res, *mem = NULL;
772 struct drm_plane *primary_plane;
773 struct drm_crtc *crtc;
774 struct drm_encoder *encoder;
775 struct drm_connector *connector;
776 unsigned long max_width, max_height;
777 size_t nformats;
778 int ret;
779
780 sdev = devm_drm_dev_alloc(&pdev->dev, drv, struct simpledrm_device, dev);
781 if (IS_ERR(sdev))
782 return ERR_CAST(sdev);
783 dev = &sdev->dev;
784 platform_set_drvdata(pdev, sdev);
785
786 /*
787 * Hardware settings
788 */
789
790 ret = simpledrm_device_init_clocks(sdev);
791 if (ret)
792 return ERR_PTR(ret);
793 ret = simpledrm_device_init_regulators(sdev);
794 if (ret)
795 return ERR_PTR(ret);
796 ret = simpledrm_device_attach_genpd(sdev);
797 if (ret)
798 return ERR_PTR(ret);
799
800 if (pd) {
801 width = simplefb_get_width_pd(dev, pd);
802 if (width < 0)
803 return ERR_PTR(width);
804 height = simplefb_get_height_pd(dev, pd);
805 if (height < 0)
806 return ERR_PTR(height);
807 stride = simplefb_get_stride_pd(dev, pd);
808 if (stride < 0)
809 return ERR_PTR(stride);
810 format = simplefb_get_format_pd(dev, pd);
811 if (IS_ERR(format))
812 return ERR_CAST(format);
813 } else if (of_node) {
814 width = simplefb_get_width_of(dev, of_node);
815 if (width < 0)
816 return ERR_PTR(width);
817 height = simplefb_get_height_of(dev, of_node);
818 if (height < 0)
819 return ERR_PTR(height);
820 stride = simplefb_get_stride_of(dev, of_node);
821 if (stride < 0)
822 return ERR_PTR(stride);
823 format = simplefb_get_format_of(dev, of_node);
824 if (IS_ERR(format))
825 return ERR_CAST(format);
826 mem = simplefb_get_memory_of(dev, of_node);
827 if (IS_ERR(mem))
828 return ERR_CAST(mem);
829 panel_node = of_parse_phandle(of_node, "panel", 0);
830 if (panel_node) {
831 simplefb_read_u32_of(dev, panel_node, "width-mm", &width_mm);
832 simplefb_read_u32_of(dev, panel_node, "height-mm", &height_mm);
833 of_node_put(panel_node);
834 }
835 } else {
836 drm_err(dev, "no simplefb configuration found\n");
837 return ERR_PTR(-ENODEV);
838 }
839 if (!stride) {
840 stride = drm_format_info_min_pitch(format, 0, width);
841 if (drm_WARN_ON(dev, !stride))
842 return ERR_PTR(-EINVAL);
843 }
844
845 /*
846 * Assume a monitor resolution of 96 dpi if physical dimensions
847 * are not specified to get a somewhat reasonable screen size.
848 */
849 if (!width_mm)
850 width_mm = DRM_MODE_RES_MM(width, 96ul);
851 if (!height_mm)
852 height_mm = DRM_MODE_RES_MM(height, 96ul);
853
854 sdev->mode = simpledrm_mode(width, height, width_mm, height_mm);
855 sdev->format = format;
856 sdev->pitch = stride;
857
858 drm_dbg(dev, "display mode={" DRM_MODE_FMT "}\n", DRM_MODE_ARG(&sdev->mode));
859 drm_dbg(dev, "framebuffer format=%p4cc, size=%dx%d, stride=%d byte\n",
860 &format->format, width, height, stride);
861
862 /*
863 * Memory management
864 */
865
866 if (mem) {
867 void *screen_base;
868
869 ret = devm_aperture_acquire_from_firmware(dev, mem->start, resource_size(mem));
870 if (ret) {
871 drm_err(dev, "could not acquire memory range %pr: %d\n", mem, ret);
872 return ERR_PTR(ret);
873 }
874
875 drm_dbg(dev, "using system memory framebuffer at %pr\n", mem);
876
877 screen_base = devm_memremap(dev->dev, mem->start, resource_size(mem), MEMREMAP_WC);
878 if (IS_ERR(screen_base))
879 return screen_base;
880
881 iosys_map_set_vaddr(&sdev->screen_base, screen_base);
882 } else {
883 void __iomem *screen_base;
884
885 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
886 if (!res)
887 return ERR_PTR(-EINVAL);
888
889 ret = devm_aperture_acquire_from_firmware(dev, res->start, resource_size(res));
890 if (ret) {
891 drm_err(dev, "could not acquire memory range %pr: %d\n", res, ret);
892 return ERR_PTR(ret);
893 }
894
895 drm_dbg(dev, "using I/O memory framebuffer at %pr\n", res);
896
897 mem = devm_request_mem_region(&pdev->dev, res->start, resource_size(res),
898 drv->name);
899 if (!mem) {
900 /*
901 * We cannot make this fatal. Sometimes this comes from magic
902 * spaces our resource handlers simply don't know about. Use
903 * the I/O-memory resource as-is and try to map that instead.
904 */
905 drm_warn(dev, "could not acquire memory region %pr\n", res);
906 mem = res;
907 }
908
909 screen_base = devm_ioremap_wc(&pdev->dev, mem->start, resource_size(mem));
910 if (!screen_base)
911 return ERR_PTR(-ENOMEM);
912
913 iosys_map_set_vaddr_iomem(&sdev->screen_base, screen_base);
914 }
915
916 /*
917 * Modesetting
918 */
919
920 ret = drmm_mode_config_init(dev);
921 if (ret)
922 return ERR_PTR(ret);
923
924 max_width = max_t(unsigned long, width, DRM_SHADOW_PLANE_MAX_WIDTH);
925 max_height = max_t(unsigned long, height, DRM_SHADOW_PLANE_MAX_HEIGHT);
926
927 dev->mode_config.min_width = width;
928 dev->mode_config.max_width = max_width;
929 dev->mode_config.min_height = height;
930 dev->mode_config.max_height = max_height;
931 dev->mode_config.preferred_depth = format->depth;
932 dev->mode_config.funcs = &simpledrm_mode_config_funcs;
933
934 /* Primary plane */
935
936 nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
937 sdev->formats, ARRAY_SIZE(sdev->formats));
938
939 primary_plane = &sdev->primary_plane;
940 ret = drm_universal_plane_init(dev, primary_plane, 0, &simpledrm_primary_plane_funcs,
941 sdev->formats, nformats,
942 simpledrm_primary_plane_format_modifiers,
943 DRM_PLANE_TYPE_PRIMARY, NULL);
944 if (ret)
945 return ERR_PTR(ret);
946 drm_plane_helper_add(primary_plane, &simpledrm_primary_plane_helper_funcs);
947 drm_plane_enable_fb_damage_clips(primary_plane);
948
949 /* CRTC */
950
951 crtc = &sdev->crtc;
952 ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
953 &simpledrm_crtc_funcs, NULL);
954 if (ret)
955 return ERR_PTR(ret);
956 drm_crtc_helper_add(crtc, &simpledrm_crtc_helper_funcs);
957
958 /* Encoder */
959
960 encoder = &sdev->encoder;
961 ret = drm_encoder_init(dev, encoder, &simpledrm_encoder_funcs,
962 DRM_MODE_ENCODER_NONE, NULL);
963 if (ret)
964 return ERR_PTR(ret);
965 encoder->possible_crtcs = drm_crtc_mask(crtc);
966
967 /* Connector */
968
969 connector = &sdev->connector;
970 ret = drm_connector_init(dev, connector, &simpledrm_connector_funcs,
971 DRM_MODE_CONNECTOR_Unknown);
972 if (ret)
973 return ERR_PTR(ret);
974 drm_connector_helper_add(connector, &simpledrm_connector_helper_funcs);
975 drm_connector_set_panel_orientation_with_quirk(connector,
976 DRM_MODE_PANEL_ORIENTATION_UNKNOWN,
977 width, height);
978
979 ret = drm_connector_attach_encoder(connector, encoder);
980 if (ret)
981 return ERR_PTR(ret);
982
983 drm_mode_config_reset(dev);
984
985 return sdev;
986}
987
988/*
989 * DRM driver
990 */
991
992DEFINE_DRM_GEM_FOPS(simpledrm_fops);
993
994static struct drm_driver simpledrm_driver = {
995 DRM_GEM_SHMEM_DRIVER_OPS,
996 .name = DRIVER_NAME,
997 .desc = DRIVER_DESC,
998 .date = DRIVER_DATE,
999 .major = DRIVER_MAJOR,
1000 .minor = DRIVER_MINOR,
1001 .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
1002 .fops = &simpledrm_fops,
1003};
1004
1005/*
1006 * Platform driver
1007 */
1008
1009static int simpledrm_probe(struct platform_device *pdev)
1010{
1011 struct simpledrm_device *sdev;
1012 struct drm_device *dev;
1013 unsigned int color_mode;
1014 int ret;
1015
1016 sdev = simpledrm_device_create(&simpledrm_driver, pdev);
1017 if (IS_ERR(sdev))
1018 return PTR_ERR(sdev);
1019 dev = &sdev->dev;
1020
1021 ret = drm_dev_register(dev, 0);
1022 if (ret)
1023 return ret;
1024
1025 color_mode = drm_format_info_bpp(sdev->format, 0);
1026 if (color_mode == 16)
1027 color_mode = sdev->format->depth; // can be 15 or 16
1028
1029 drm_fbdev_generic_setup(dev, color_mode);
1030
1031 return 0;
1032}
1033
1034static void simpledrm_remove(struct platform_device *pdev)
1035{
1036 struct simpledrm_device *sdev = platform_get_drvdata(pdev);
1037 struct drm_device *dev = &sdev->dev;
1038
1039 drm_dev_unplug(dev);
1040}
1041
1042static const struct of_device_id simpledrm_of_match_table[] = {
1043 { .compatible = "simple-framebuffer", },
1044 { },
1045};
1046MODULE_DEVICE_TABLE(of, simpledrm_of_match_table);
1047
1048static struct platform_driver simpledrm_platform_driver = {
1049 .driver = {
1050 .name = "simple-framebuffer", /* connect to sysfb */
1051 .of_match_table = simpledrm_of_match_table,
1052 },
1053 .probe = simpledrm_probe,
1054 .remove_new = simpledrm_remove,
1055};
1056
1057module_platform_driver(simpledrm_platform_driver);
1058
1059MODULE_DESCRIPTION(DRIVER_DESC);
1060MODULE_LICENSE("GPL v2");