1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * shmob_drm_crtc.c -- SH Mobile DRM CRTCs
4 *
5 * Copyright (C) 2012 Renesas Electronics Corporation
6 *
7 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
8 */
9
10#include <linux/clk.h>
11#include <linux/media-bus-format.h>
12#include <linux/of.h>
13#include <linux/of_graph.h>
14#include <linux/pm_runtime.h>
15
16#include <drm/drm_atomic.h>
17#include <drm/drm_atomic_helper.h>
18#include <drm/drm_atomic_state_helper.h>
19#include <drm/drm_atomic_uapi.h>
20#include <drm/drm_bridge.h>
21#include <drm/drm_bridge_connector.h>
22#include <drm/drm_crtc.h>
23#include <drm/drm_crtc_helper.h>
24#include <drm/drm_fb_dma_helper.h>
25#include <drm/drm_fourcc.h>
26#include <drm/drm_framebuffer.h>
27#include <drm/drm_gem_dma_helper.h>
28#include <drm/drm_modeset_helper.h>
29#include <drm/drm_modeset_helper_vtables.h>
30#include <drm/drm_panel.h>
31#include <drm/drm_probe_helper.h>
32#include <drm/drm_simple_kms_helper.h>
33#include <drm/drm_vblank.h>
34
35#include <video/videomode.h>
36
37#include "shmob_drm_crtc.h"
38#include "shmob_drm_drv.h"
39#include "shmob_drm_kms.h"
40#include "shmob_drm_plane.h"
41#include "shmob_drm_regs.h"
42
43/* -----------------------------------------------------------------------------
44 * Page Flip
45 */
46
47void shmob_drm_crtc_finish_page_flip(struct shmob_drm_crtc *scrtc)
48{
49 struct drm_pending_vblank_event *event;
50 struct drm_device *dev = scrtc->base.dev;
51 unsigned long flags;
52
53 spin_lock_irqsave(&dev->event_lock, flags);
54 event = scrtc->event;
55 scrtc->event = NULL;
56 if (event) {
57 drm_crtc_send_vblank_event(crtc: &scrtc->base, e: event);
58 wake_up(&scrtc->flip_wait);
59 drm_crtc_vblank_put(crtc: &scrtc->base);
60 }
61 spin_unlock_irqrestore(lock: &dev->event_lock, flags);
62}
63
64static bool shmob_drm_crtc_page_flip_pending(struct shmob_drm_crtc *scrtc)
65{
66 struct drm_device *dev = scrtc->base.dev;
67 unsigned long flags;
68 bool pending;
69
70 spin_lock_irqsave(&dev->event_lock, flags);
71 pending = scrtc->event != NULL;
72 spin_unlock_irqrestore(lock: &dev->event_lock, flags);
73
74 return pending;
75}
76
77static void shmob_drm_crtc_wait_page_flip(struct shmob_drm_crtc *scrtc)
78{
79 struct drm_crtc *crtc = &scrtc->base;
80 struct shmob_drm_device *sdev = to_shmob_device(dev: crtc->dev);
81
82 if (wait_event_timeout(scrtc->flip_wait,
83 !shmob_drm_crtc_page_flip_pending(scrtc),
84 msecs_to_jiffies(50)))
85 return;
86
87 dev_warn(sdev->dev, "page flip timeout\n");
88
89 shmob_drm_crtc_finish_page_flip(scrtc);
90}
91
92/* -----------------------------------------------------------------------------
93 * CRTC
94 */
95
96static const struct {
97 u32 fmt;
98 u32 ldmt1r;
99} shmob_drm_bus_fmts[] = {
100 { MEDIA_BUS_FMT_RGB888_3X8, LDMT1R_MIFTYP_RGB8 },
101 { MEDIA_BUS_FMT_RGB666_2X9_BE, LDMT1R_MIFTYP_RGB9 },
102 { MEDIA_BUS_FMT_RGB888_2X12_BE, LDMT1R_MIFTYP_RGB12A },
103 { MEDIA_BUS_FMT_RGB444_1X12, LDMT1R_MIFTYP_RGB12B },
104 { MEDIA_BUS_FMT_RGB565_1X16, LDMT1R_MIFTYP_RGB16 },
105 { MEDIA_BUS_FMT_RGB666_1X18, LDMT1R_MIFTYP_RGB18 },
106 { MEDIA_BUS_FMT_RGB888_1X24, LDMT1R_MIFTYP_RGB24 },
107 { MEDIA_BUS_FMT_UYVY8_1X16, LDMT1R_MIFTYP_YCBCR },
108};
109
110static void shmob_drm_crtc_setup_geometry(struct shmob_drm_crtc *scrtc)
111{
112 struct drm_crtc *crtc = &scrtc->base;
113 struct shmob_drm_device *sdev = to_shmob_device(dev: crtc->dev);
114 const struct drm_display_info *info = &sdev->connector->display_info;
115 const struct drm_display_mode *mode = &crtc->mode;
116 unsigned int i;
117 u32 value;
118
119 if (!info->num_bus_formats || !info->bus_formats) {
120 dev_warn(sdev->dev, "No bus format reported, using RGB888\n");
121 value = LDMT1R_MIFTYP_RGB24;
122 } else {
123 for (i = 0; i < ARRAY_SIZE(shmob_drm_bus_fmts); i++) {
124 if (shmob_drm_bus_fmts[i].fmt == info->bus_formats[0])
125 break;
126 }
127 if (i < ARRAY_SIZE(shmob_drm_bus_fmts)) {
128 value = shmob_drm_bus_fmts[i].ldmt1r;
129 } else {
130 dev_warn(sdev->dev,
131 "unsupported bus format 0x%x, using RGB888\n",
132 info->bus_formats[0]);
133 value = LDMT1R_MIFTYP_RGB24;
134 }
135 }
136
137 if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE)
138 value |= LDMT1R_DWPOL;
139 if (info->bus_flags & DRM_BUS_FLAG_DE_LOW)
140 value |= LDMT1R_DIPOL;
141 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
142 value |= LDMT1R_VPOL;
143 if (mode->flags & DRM_MODE_FLAG_NHSYNC)
144 value |= LDMT1R_HPOL;
145 lcdc_write(sdev, LDMT1R, data: value);
146
147 value = ((mode->hdisplay / 8) << 16) /* HDCN */
148 | (mode->htotal / 8); /* HTCN */
149 lcdc_write(sdev, LDHCNR, data: value);
150
151 value = (((mode->hsync_end - mode->hsync_start) / 8) << 16) /* HSYNW */
152 | (mode->hsync_start / 8); /* HSYNP */
153 lcdc_write(sdev, LDHSYNR, data: value);
154
155 value = ((mode->hdisplay & 7) << 24) | ((mode->htotal & 7) << 16)
156 | (((mode->hsync_end - mode->hsync_start) & 7) << 8)
157 | (mode->hsync_start & 7);
158 lcdc_write(sdev, LDHAJR, data: value);
159
160 value = ((mode->vdisplay) << 16) /* VDLN */
161 | mode->vtotal; /* VTLN */
162 lcdc_write(sdev, LDVLNR, data: value);
163
164 value = ((mode->vsync_end - mode->vsync_start) << 16) /* VSYNW */
165 | mode->vsync_start; /* VSYNP */
166 lcdc_write(sdev, LDVSYNR, data: value);
167}
168
169static void shmob_drm_crtc_start_stop(struct shmob_drm_crtc *scrtc, bool start)
170{
171 struct shmob_drm_device *sdev = to_shmob_device(dev: scrtc->base.dev);
172 u32 value;
173
174 value = lcdc_read(sdev, LDCNT2R);
175 if (start)
176 lcdc_write(sdev, LDCNT2R, data: value | LDCNT2R_DO);
177 else
178 lcdc_write(sdev, LDCNT2R, data: value & ~LDCNT2R_DO);
179
180 /* Wait until power is applied/stopped. */
181 while (1) {
182 value = lcdc_read(sdev, LDPMR) & LDPMR_LPS;
183 if ((start && value) || (!start && !value))
184 break;
185
186 cpu_relax();
187 }
188
189 if (!start) {
190 /* Stop the dot clock. */
191 lcdc_write(sdev, LDDCKSTPR, LDDCKSTPR_DCKSTP);
192 }
193}
194
195static inline struct shmob_drm_crtc *to_shmob_crtc(struct drm_crtc *crtc)
196{
197 return container_of(crtc, struct shmob_drm_crtc, base);
198}
199
200static void shmob_drm_crtc_atomic_enable(struct drm_crtc *crtc,
201 struct drm_atomic_state *state)
202{
203 struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);
204 struct shmob_drm_device *sdev = to_shmob_device(dev: crtc->dev);
205 unsigned int clk_div = sdev->config.clk_div;
206 struct device *dev = sdev->dev;
207 u32 value;
208 int ret;
209
210 ret = pm_runtime_resume_and_get(dev);
211 if (ret)
212 return;
213
214 /* Reset and enable the LCDC. */
215 lcdc_write(sdev, LDCNT2R, data: lcdc_read(sdev, LDCNT2R) | LDCNT2R_BR);
216 lcdc_wait_bit(sdev, LDCNT2R, LDCNT2R_BR, until: 0);
217 lcdc_write(sdev, LDCNT2R, LDCNT2R_ME);
218
219 /* Stop the LCDC first and disable all interrupts. */
220 shmob_drm_crtc_start_stop(scrtc, start: false);
221 lcdc_write(sdev, LDINTR, data: 0);
222
223 /* Configure power supply, dot clocks and start them. */
224 lcdc_write(sdev, LDPMR, data: 0);
225
226 value = sdev->lddckr;
227 if (clk_div) {
228 /* FIXME: sh7724 can only use 42, 48, 54 and 60 for the divider
229 * denominator.
230 */
231 lcdc_write(sdev, LDDCKPAT1R, data: 0);
232 lcdc_write(sdev, LDDCKPAT2R, data: (1 << (clk_div / 2)) - 1);
233
234 if (clk_div == 1)
235 value |= LDDCKR_MOSEL;
236 else
237 value |= clk_div;
238 }
239
240 lcdc_write(sdev, LDDCKR, data: value);
241 lcdc_write(sdev, LDDCKSTPR, data: 0);
242 lcdc_wait_bit(sdev, LDDCKSTPR, mask: ~0, until: 0);
243
244 /* Setup geometry, format, frame buffer memory and operation mode. */
245 shmob_drm_crtc_setup_geometry(scrtc);
246
247 lcdc_write(sdev, LDSM1R, data: 0);
248
249 /* Enable the display output. */
250 lcdc_write(sdev, LDCNT1R, LDCNT1R_DE);
251
252 shmob_drm_crtc_start_stop(scrtc, start: true);
253
254 /* Turn vertical blank interrupt reporting back on. */
255 drm_crtc_vblank_on(crtc);
256}
257
258static void shmob_drm_crtc_atomic_disable(struct drm_crtc *crtc,
259 struct drm_atomic_state *state)
260{
261 struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);
262 struct shmob_drm_device *sdev = to_shmob_device(dev: crtc->dev);
263
264 /*
265 * Disable vertical blank interrupt reporting. We first need to wait
266 * for page flip completion before stopping the CRTC as userspace
267 * expects page flips to eventually complete.
268 */
269 shmob_drm_crtc_wait_page_flip(scrtc);
270 drm_crtc_vblank_off(crtc);
271
272 /* Stop the LCDC. */
273 shmob_drm_crtc_start_stop(scrtc, start: false);
274
275 /* Disable the display output. */
276 lcdc_write(sdev, LDCNT1R, data: 0);
277
278 pm_runtime_put(dev: sdev->dev);
279}
280
281static void shmob_drm_crtc_atomic_flush(struct drm_crtc *crtc,
282 struct drm_atomic_state *state)
283{
284 struct drm_pending_vblank_event *event;
285 struct drm_device *dev = crtc->dev;
286 unsigned long flags;
287
288 if (crtc->state->event) {
289 spin_lock_irqsave(&dev->event_lock, flags);
290 event = crtc->state->event;
291 crtc->state->event = NULL;
292 drm_crtc_send_vblank_event(crtc, e: event);
293 spin_unlock_irqrestore(lock: &dev->event_lock, flags);
294 }
295}
296
297static const struct drm_crtc_helper_funcs crtc_helper_funcs = {
298 .atomic_flush = shmob_drm_crtc_atomic_flush,
299 .atomic_enable = shmob_drm_crtc_atomic_enable,
300 .atomic_disable = shmob_drm_crtc_atomic_disable,
301};
302
303static int shmob_drm_crtc_page_flip(struct drm_crtc *crtc,
304 struct drm_framebuffer *fb,
305 struct drm_pending_vblank_event *event,
306 uint32_t page_flip_flags,
307 struct drm_modeset_acquire_ctx *ctx)
308{
309 struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);
310 struct drm_device *dev = scrtc->base.dev;
311 unsigned long flags;
312
313 spin_lock_irqsave(&dev->event_lock, flags);
314 if (scrtc->event != NULL) {
315 spin_unlock_irqrestore(lock: &dev->event_lock, flags);
316 return -EBUSY;
317 }
318 spin_unlock_irqrestore(lock: &dev->event_lock, flags);
319
320 drm_atomic_set_fb_for_plane(plane_state: crtc->primary->state, fb);
321
322 if (event) {
323 event->pipe = 0;
324 drm_crtc_vblank_get(crtc: &scrtc->base);
325 spin_lock_irqsave(&dev->event_lock, flags);
326 scrtc->event = event;
327 spin_unlock_irqrestore(lock: &dev->event_lock, flags);
328 }
329
330 return 0;
331}
332
333static void shmob_drm_crtc_enable_vblank(struct shmob_drm_device *sdev,
334 bool enable)
335{
336 unsigned long flags;
337 u32 ldintr;
338
339 /* Be careful not to acknowledge any pending interrupt. */
340 spin_lock_irqsave(&sdev->irq_lock, flags);
341 ldintr = lcdc_read(sdev, LDINTR) | LDINTR_STATUS_MASK;
342 if (enable)
343 ldintr |= LDINTR_VEE;
344 else
345 ldintr &= ~LDINTR_VEE;
346 lcdc_write(sdev, LDINTR, data: ldintr);
347 spin_unlock_irqrestore(lock: &sdev->irq_lock, flags);
348}
349
350static int shmob_drm_enable_vblank(struct drm_crtc *crtc)
351{
352 struct shmob_drm_device *sdev = to_shmob_device(dev: crtc->dev);
353
354 shmob_drm_crtc_enable_vblank(sdev, enable: true);
355
356 return 0;
357}
358
359static void shmob_drm_disable_vblank(struct drm_crtc *crtc)
360{
361 struct shmob_drm_device *sdev = to_shmob_device(dev: crtc->dev);
362
363 shmob_drm_crtc_enable_vblank(sdev, enable: false);
364}
365
366static const struct drm_crtc_funcs crtc_funcs = {
367 .reset = drm_atomic_helper_crtc_reset,
368 .destroy = drm_crtc_cleanup,
369 .set_config = drm_atomic_helper_set_config,
370 .page_flip = shmob_drm_crtc_page_flip,
371 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
372 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
373 .enable_vblank = shmob_drm_enable_vblank,
374 .disable_vblank = shmob_drm_disable_vblank,
375};
376
377int shmob_drm_crtc_create(struct shmob_drm_device *sdev)
378{
379 struct drm_crtc *crtc = &sdev->crtc.base;
380 struct drm_plane *primary, *plane;
381 unsigned int i;
382 int ret;
383
384 init_waitqueue_head(&sdev->crtc.flip_wait);
385
386 primary = shmob_drm_plane_create(sdev, type: DRM_PLANE_TYPE_PRIMARY, index: 0);
387 if (IS_ERR(ptr: primary))
388 return PTR_ERR(ptr: primary);
389
390 for (i = 1; i < 5; ++i) {
391 plane = shmob_drm_plane_create(sdev, type: DRM_PLANE_TYPE_OVERLAY, index: i);
392 if (IS_ERR(ptr: plane))
393 return PTR_ERR(ptr: plane);
394 }
395
396 ret = drm_crtc_init_with_planes(dev: &sdev->ddev, crtc, primary, NULL,
397 funcs: &crtc_funcs, NULL);
398 if (ret < 0)
399 return ret;
400
401 drm_crtc_helper_add(crtc, funcs: &crtc_helper_funcs);
402
403 /* Start with vertical blank interrupt reporting disabled. */
404 drm_crtc_vblank_off(crtc);
405
406 return 0;
407}
408
409/* -----------------------------------------------------------------------------
410 * Legacy Encoder
411 */
412
413static bool shmob_drm_encoder_mode_fixup(struct drm_encoder *encoder,
414 const struct drm_display_mode *mode,
415 struct drm_display_mode *adjusted_mode)
416{
417 struct drm_device *dev = encoder->dev;
418 struct shmob_drm_device *sdev = to_shmob_device(dev);
419 struct drm_connector *connector = sdev->connector;
420 const struct drm_display_mode *panel_mode;
421
422 if (list_empty(head: &connector->modes)) {
423 dev_dbg(dev->dev, "mode_fixup: empty modes list\n");
424 return false;
425 }
426
427 /* The flat panel mode is fixed, just copy it to the adjusted mode. */
428 panel_mode = list_first_entry(&connector->modes,
429 struct drm_display_mode, head);
430 drm_mode_copy(dst: adjusted_mode, src: panel_mode);
431
432 return true;
433}
434
435static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
436 .mode_fixup = shmob_drm_encoder_mode_fixup,
437};
438
439/* -----------------------------------------------------------------------------
440 * Encoder
441 */
442
443int shmob_drm_encoder_create(struct shmob_drm_device *sdev)
444{
445 struct drm_encoder *encoder = &sdev->encoder;
446 struct drm_bridge *bridge;
447 int ret;
448
449 encoder->possible_crtcs = 1;
450
451 ret = drm_simple_encoder_init(dev: &sdev->ddev, encoder,
452 DRM_MODE_ENCODER_DPI);
453 if (ret < 0)
454 return ret;
455
456 if (sdev->pdata) {
457 drm_encoder_helper_add(encoder, funcs: &encoder_helper_funcs);
458 return 0;
459 }
460
461 /* Create a panel bridge */
462 bridge = devm_drm_of_get_bridge(dev: sdev->dev, node: sdev->dev->of_node, port: 0, endpoint: 0);
463 if (IS_ERR(ptr: bridge))
464 return PTR_ERR(ptr: bridge);
465
466 /* Attach the bridge to the encoder */
467 ret = drm_bridge_attach(encoder, bridge, NULL,
468 flags: DRM_BRIDGE_ATTACH_NO_CONNECTOR);
469 if (ret) {
470 dev_err(sdev->dev, "failed to attach bridge: %pe\n",
471 ERR_PTR(ret));
472 return ret;
473 }
474
475 return 0;
476}
477
478/* -----------------------------------------------------------------------------
479 * Legacy Connector
480 */
481
482static inline struct shmob_drm_connector *to_shmob_connector(struct drm_connector *connector)
483{
484 return container_of(connector, struct shmob_drm_connector, base);
485}
486
487static int shmob_drm_connector_get_modes(struct drm_connector *connector)
488{
489 struct shmob_drm_connector *scon = to_shmob_connector(connector);
490 struct drm_display_mode *mode;
491
492 mode = drm_mode_create(dev: connector->dev);
493 if (mode == NULL)
494 return 0;
495
496 mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
497
498 drm_display_mode_from_videomode(vm: scon->mode, dmode: mode);
499
500 drm_mode_probed_add(connector, mode);
501
502 return 1;
503}
504
505static struct drm_encoder *
506shmob_drm_connector_best_encoder(struct drm_connector *connector)
507{
508 struct shmob_drm_connector *scon = to_shmob_connector(connector);
509
510 return scon->encoder;
511}
512
513static const struct drm_connector_helper_funcs connector_helper_funcs = {
514 .get_modes = shmob_drm_connector_get_modes,
515 .best_encoder = shmob_drm_connector_best_encoder,
516};
517
518static void shmob_drm_connector_destroy(struct drm_connector *connector)
519{
520 drm_connector_unregister(connector);
521 drm_connector_cleanup(connector);
522
523 kfree(objp: connector);
524}
525
526static const struct drm_connector_funcs connector_funcs = {
527 .reset = drm_atomic_helper_connector_reset,
528 .fill_modes = drm_helper_probe_single_connector_modes,
529 .destroy = shmob_drm_connector_destroy,
530 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
531 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
532};
533
534static struct drm_connector *
535shmob_drm_connector_init(struct shmob_drm_device *sdev,
536 struct drm_encoder *encoder)
537{
538 u32 bus_fmt = sdev->pdata->iface.bus_fmt;
539 struct shmob_drm_connector *scon;
540 struct drm_connector *connector;
541 struct drm_display_info *info;
542 unsigned int i;
543 int ret;
544
545 for (i = 0; i < ARRAY_SIZE(shmob_drm_bus_fmts); i++) {
546 if (shmob_drm_bus_fmts[i].fmt == bus_fmt)
547 break;
548 }
549 if (i == ARRAY_SIZE(shmob_drm_bus_fmts)) {
550 dev_err(sdev->dev, "unsupported bus format 0x%x\n", bus_fmt);
551 return ERR_PTR(error: -EINVAL);
552 }
553
554 scon = kzalloc(size: sizeof(*scon), GFP_KERNEL);
555 if (!scon)
556 return ERR_PTR(error: -ENOMEM);
557
558 connector = &scon->base;
559 scon->encoder = encoder;
560 scon->mode = &sdev->pdata->panel.mode;
561
562 info = &connector->display_info;
563 info->width_mm = sdev->pdata->panel.width_mm;
564 info->height_mm = sdev->pdata->panel.height_mm;
565
566 if (scon->mode->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
567 info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
568 if (scon->mode->flags & DISPLAY_FLAGS_DE_LOW)
569 info->bus_flags |= DRM_BUS_FLAG_DE_LOW;
570
571 ret = drm_display_info_set_bus_formats(info, formats: &bus_fmt, num_formats: 1);
572 if (ret < 0) {
573 kfree(objp: scon);
574 return ERR_PTR(error: ret);
575 }
576
577 ret = drm_connector_init(dev: &sdev->ddev, connector, funcs: &connector_funcs,
578 DRM_MODE_CONNECTOR_DPI);
579 if (ret < 0) {
580 kfree(objp: scon);
581 return ERR_PTR(error: ret);
582 }
583
584 drm_connector_helper_add(connector, funcs: &connector_helper_funcs);
585
586 return connector;
587}
588
589/* -----------------------------------------------------------------------------
590 * Connector
591 */
592
593int shmob_drm_connector_create(struct shmob_drm_device *sdev,
594 struct drm_encoder *encoder)
595{
596 struct drm_connector *connector;
597 int ret;
598
599 if (sdev->pdata)
600 connector = shmob_drm_connector_init(sdev, encoder);
601 else
602 connector = drm_bridge_connector_init(drm: &sdev->ddev, encoder);
603 if (IS_ERR(ptr: connector)) {
604 dev_err(sdev->dev, "failed to created connector: %pe\n",
605 connector);
606 return PTR_ERR(ptr: connector);
607 }
608
609 ret = drm_connector_attach_encoder(connector, encoder);
610 if (ret < 0)
611 goto error;
612
613 connector->dpms = DRM_MODE_DPMS_OFF;
614
615 sdev->connector = connector;
616
617 return 0;
618
619error:
620 drm_connector_cleanup(connector);
621 return ret;
622}
623

source code of linux/drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c