1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright © 2018 Broadcom
4 *
5 * Authors:
6 * Eric Anholt <eric@anholt.net>
7 * Boris Brezillon <boris.brezillon@bootlin.com>
8 */
9
10#include <linux/clk.h>
11#include <linux/component.h>
12#include <linux/mod_devicetable.h>
13#include <linux/platform_device.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_drv.h>
19#include <drm/drm_edid.h>
20#include <drm/drm_fb_dma_helper.h>
21#include <drm/drm_fourcc.h>
22#include <drm/drm_framebuffer.h>
23#include <drm/drm_panel.h>
24#include <drm/drm_print.h>
25#include <drm/drm_probe_helper.h>
26#include <drm/drm_vblank.h>
27#include <drm/drm_writeback.h>
28
29#include "vc4_drv.h"
30#include "vc4_regs.h"
31
32/* Base address of the output. Raster formats must be 4-byte aligned,
33 * T and LT must be 16-byte aligned or maybe utile-aligned (docs are
34 * inconsistent, but probably utile).
35 */
36#define TXP_DST_PTR 0x00
37
38/* Pitch in bytes for raster images, 16-byte aligned. For tiled, it's
39 * the width in tiles.
40 */
41#define TXP_DST_PITCH 0x04
42/* For T-tiled imgaes, DST_PITCH should be the number of tiles wide,
43 * shifted up.
44 */
45# define TXP_T_TILE_WIDTH_SHIFT 7
46/* For LT-tiled images, DST_PITCH should be the number of utiles wide,
47 * shifted up.
48 */
49# define TXP_LT_TILE_WIDTH_SHIFT 4
50
51/* Pre-rotation width/height of the image. Must match HVS config.
52 *
53 * If TFORMAT and 32-bit, limit is 1920 for 32-bit and 3840 to 16-bit
54 * and width/height must be tile or utile-aligned as appropriate. If
55 * transposing (rotating), width is limited to 1920.
56 *
57 * Height is limited to various numbers between 4088 and 4095. I'd
58 * just use 4088 to be safe.
59 */
60#define TXP_DIM 0x08
61# define TXP_HEIGHT_SHIFT 16
62# define TXP_HEIGHT_MASK GENMASK(31, 16)
63# define TXP_WIDTH_SHIFT 0
64# define TXP_WIDTH_MASK GENMASK(15, 0)
65
66#define TXP_DST_CTRL 0x0c
67/* These bits are set to 0x54 */
68#define TXP_PILOT_SHIFT 24
69#define TXP_PILOT_MASK GENMASK(31, 24)
70/* Bits 22-23 are set to 0x01 */
71#define TXP_VERSION_SHIFT 22
72#define TXP_VERSION_MASK GENMASK(23, 22)
73
74/* Powers down the internal memory. */
75# define TXP_POWERDOWN BIT(21)
76
77/* Enables storing the alpha component in 8888/4444, instead of
78 * filling with ~ALPHA_INVERT.
79 */
80# define TXP_ALPHA_ENABLE BIT(20)
81
82/* 4 bits, each enables stores for a channel in each set of 4 bytes.
83 * Set to 0xf for normal operation.
84 */
85# define TXP_BYTE_ENABLE_SHIFT 16
86# define TXP_BYTE_ENABLE_MASK GENMASK(19, 16)
87
88/* Debug: Generate VSTART again at EOF. */
89# define TXP_VSTART_AT_EOF BIT(15)
90
91/* Debug: Terminate the current frame immediately. Stops AXI
92 * writes.
93 */
94# define TXP_ABORT BIT(14)
95
96# define TXP_DITHER BIT(13)
97
98/* Inverts alpha if TXP_ALPHA_ENABLE, chooses fill value for
99 * !TXP_ALPHA_ENABLE.
100 */
101# define TXP_ALPHA_INVERT BIT(12)
102
103/* Note: I've listed the channels here in high bit (in byte 3/2/1) to
104 * low bit (in byte 0) order.
105 */
106# define TXP_FORMAT_SHIFT 8
107# define TXP_FORMAT_MASK GENMASK(11, 8)
108# define TXP_FORMAT_ABGR4444 0
109# define TXP_FORMAT_ARGB4444 1
110# define TXP_FORMAT_BGRA4444 2
111# define TXP_FORMAT_RGBA4444 3
112# define TXP_FORMAT_BGR565 6
113# define TXP_FORMAT_RGB565 7
114/* 888s are non-rotated, raster-only */
115# define TXP_FORMAT_BGR888 8
116# define TXP_FORMAT_RGB888 9
117# define TXP_FORMAT_ABGR8888 12
118# define TXP_FORMAT_ARGB8888 13
119# define TXP_FORMAT_BGRA8888 14
120# define TXP_FORMAT_RGBA8888 15
121
122/* If TFORMAT is set, generates LT instead of T format. */
123# define TXP_LINEAR_UTILE BIT(7)
124
125/* Rotate output by 90 degrees. */
126# define TXP_TRANSPOSE BIT(6)
127
128/* Generate a tiled format for V3D. */
129# define TXP_TFORMAT BIT(5)
130
131/* Generates some undefined test mode output. */
132# define TXP_TEST_MODE BIT(4)
133
134/* Request odd field from HVS. */
135# define TXP_FIELD BIT(3)
136
137/* Raise interrupt when idle. */
138# define TXP_EI BIT(2)
139
140/* Set when generating a frame, clears when idle. */
141# define TXP_BUSY BIT(1)
142
143/* Starts a frame. Self-clearing. */
144# define TXP_GO BIT(0)
145
146/* Number of lines received and committed to memory. */
147#define TXP_PROGRESS 0x10
148
149#define TXP_DST_PTR_HIGH_MOPLET 0x1c
150#define TXP_DST_PTR_HIGH_MOP 0x24
151
152#define TXP_READ(offset) \
153 ({ \
154 kunit_fail_current_test("Accessing a register in a unit test!\n"); \
155 readl(txp->regs + (offset)); \
156 })
157
158#define TXP_WRITE(offset, val) \
159 do { \
160 kunit_fail_current_test("Accessing a register in a unit test!\n"); \
161 writel(val, txp->regs + (offset)); \
162 } while (0)
163
164struct vc4_txp {
165 struct vc4_crtc base;
166 const struct vc4_txp_data *data;
167
168 struct platform_device *pdev;
169
170 struct vc4_encoder encoder;
171 struct drm_writeback_connector connector;
172
173 void __iomem *regs;
174};
175
176#define encoder_to_vc4_txp(_encoder) \
177 container_of_const(_encoder, struct vc4_txp, encoder.base)
178
179#define connector_to_vc4_txp(_connector) \
180 container_of_const(_connector, struct vc4_txp, connector.base)
181
182static const struct debugfs_reg32 txp_regs[] = {
183 VC4_REG32(TXP_DST_PTR),
184 VC4_REG32(TXP_DST_PITCH),
185 VC4_REG32(TXP_DIM),
186 VC4_REG32(TXP_DST_CTRL),
187 VC4_REG32(TXP_PROGRESS),
188};
189
190static int vc4_txp_connector_get_modes(struct drm_connector *connector)
191{
192 struct drm_device *dev = connector->dev;
193
194 return drm_add_modes_noedid(connector, hdisplay: dev->mode_config.max_width,
195 vdisplay: dev->mode_config.max_height);
196}
197
198static enum drm_mode_status
199vc4_txp_connector_mode_valid(struct drm_connector *connector,
200 const struct drm_display_mode *mode)
201{
202 struct drm_device *dev = connector->dev;
203 struct drm_mode_config *mode_config = &dev->mode_config;
204 int w = mode->hdisplay, h = mode->vdisplay;
205
206 if (w < mode_config->min_width || w > mode_config->max_width)
207 return MODE_BAD_HVALUE;
208
209 if (h < mode_config->min_height || h > mode_config->max_height)
210 return MODE_BAD_VVALUE;
211
212 return MODE_OK;
213}
214
215static const u32 drm_fmts[] = {
216 DRM_FORMAT_RGB888,
217 DRM_FORMAT_BGR888,
218 DRM_FORMAT_XRGB8888,
219 DRM_FORMAT_XBGR8888,
220 DRM_FORMAT_ARGB8888,
221 DRM_FORMAT_ABGR8888,
222 DRM_FORMAT_RGBX8888,
223 DRM_FORMAT_BGRX8888,
224 DRM_FORMAT_RGBA8888,
225 DRM_FORMAT_BGRA8888,
226};
227
228static const u32 txp_fmts[] = {
229 TXP_FORMAT_RGB888,
230 TXP_FORMAT_BGR888,
231 TXP_FORMAT_ARGB8888,
232 TXP_FORMAT_ABGR8888,
233 TXP_FORMAT_ARGB8888,
234 TXP_FORMAT_ABGR8888,
235 TXP_FORMAT_RGBA8888,
236 TXP_FORMAT_BGRA8888,
237 TXP_FORMAT_RGBA8888,
238 TXP_FORMAT_BGRA8888,
239};
240
241static void vc4_txp_armed(struct drm_crtc_state *state)
242{
243 struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(state);
244
245 vc4_state->txp_armed = true;
246}
247
248static int vc4_txp_connector_atomic_check(struct drm_connector *conn,
249 struct drm_atomic_state *state)
250{
251 struct drm_connector_state *conn_state;
252 struct drm_crtc_state *crtc_state;
253 struct drm_framebuffer *fb;
254 int i;
255
256 conn_state = drm_atomic_get_new_connector_state(state, connector: conn);
257 if (!conn_state->writeback_job)
258 return 0;
259
260 crtc_state = drm_atomic_get_new_crtc_state(state, crtc: conn_state->crtc);
261
262 fb = conn_state->writeback_job->fb;
263 if (fb->width != crtc_state->mode.hdisplay ||
264 fb->height != crtc_state->mode.vdisplay) {
265 DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
266 fb->width, fb->height);
267 return -EINVAL;
268 }
269
270 for (i = 0; i < ARRAY_SIZE(drm_fmts); i++) {
271 if (fb->format->format == drm_fmts[i])
272 break;
273 }
274
275 if (i == ARRAY_SIZE(drm_fmts))
276 return -EINVAL;
277
278 /* Pitch must be aligned on 16 bytes. */
279 if (fb->pitches[0] & GENMASK(3, 0))
280 return -EINVAL;
281
282 vc4_txp_armed(state: crtc_state);
283
284 return 0;
285}
286
287static void vc4_txp_connector_atomic_commit(struct drm_connector *conn,
288 struct drm_atomic_state *state)
289{
290 struct drm_device *drm = conn->dev;
291 struct drm_connector_state *conn_state = drm_atomic_get_new_connector_state(state,
292 connector: conn);
293 struct vc4_txp *txp = connector_to_vc4_txp(conn);
294 const struct vc4_txp_data *txp_data = txp->data;
295 struct drm_gem_dma_object *gem;
296 struct drm_display_mode *mode;
297 struct drm_framebuffer *fb;
298 unsigned int hdisplay;
299 unsigned int vdisplay;
300 dma_addr_t addr;
301 u32 ctrl;
302 int idx;
303 int i;
304
305 if (WARN_ON(!conn_state->writeback_job))
306 return;
307
308 mode = &conn_state->crtc->state->adjusted_mode;
309 fb = conn_state->writeback_job->fb;
310
311 for (i = 0; i < ARRAY_SIZE(drm_fmts); i++) {
312 if (fb->format->format == drm_fmts[i])
313 break;
314 }
315
316 if (WARN_ON(i == ARRAY_SIZE(drm_fmts)))
317 return;
318
319 ctrl = TXP_GO | TXP_EI |
320 VC4_SET_FIELD(txp_fmts[i], TXP_FORMAT);
321
322 if (txp_data->has_byte_enable)
323 ctrl |= VC4_SET_FIELD(0xf, TXP_BYTE_ENABLE);
324
325 if (fb->format->has_alpha)
326 ctrl |= TXP_ALPHA_ENABLE;
327 else
328 /*
329 * If TXP_ALPHA_ENABLE isn't set and TXP_ALPHA_INVERT is, the
330 * hardware will force the output padding to be 0xff.
331 */
332 ctrl |= TXP_ALPHA_INVERT;
333
334 if (!drm_dev_enter(dev: drm, idx: &idx))
335 return;
336
337 gem = drm_fb_dma_get_gem_obj(fb, plane: 0);
338 addr = gem->dma_addr + fb->offsets[0];
339
340 TXP_WRITE(TXP_DST_PTR, lower_32_bits(addr));
341
342 if (txp_data->supports_40bit_addresses)
343 TXP_WRITE(txp_data->high_addr_ptr_reg, upper_32_bits(addr) & 0xff);
344
345 TXP_WRITE(TXP_DST_PITCH, fb->pitches[0]);
346
347 hdisplay = mode->hdisplay ?: 1;
348 vdisplay = mode->vdisplay ?: 1;
349 if (txp_data->size_minus_one) {
350 hdisplay -= 1;
351 vdisplay -= 1;
352 }
353
354 TXP_WRITE(TXP_DIM,
355 VC4_SET_FIELD(hdisplay, TXP_WIDTH) |
356 VC4_SET_FIELD(vdisplay, TXP_HEIGHT));
357
358 TXP_WRITE(TXP_DST_CTRL, ctrl);
359
360 drm_writeback_queue_job(wb_connector: &txp->connector, conn_state);
361
362 drm_dev_exit(idx);
363}
364
365static const struct drm_connector_helper_funcs vc4_txp_connector_helper_funcs = {
366 .get_modes = vc4_txp_connector_get_modes,
367 .mode_valid = vc4_txp_connector_mode_valid,
368 .atomic_check = vc4_txp_connector_atomic_check,
369 .atomic_commit = vc4_txp_connector_atomic_commit,
370};
371
372static enum drm_connector_status
373vc4_txp_connector_detect(struct drm_connector *connector, bool force)
374{
375 return connector_status_connected;
376}
377
378static const struct drm_connector_funcs vc4_txp_connector_funcs = {
379 .detect = vc4_txp_connector_detect,
380 .fill_modes = drm_helper_probe_single_connector_modes,
381 .destroy = drm_connector_cleanup,
382 .reset = drm_atomic_helper_connector_reset,
383 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
384 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
385};
386
387static void vc4_txp_encoder_disable(struct drm_encoder *encoder)
388{
389 struct drm_device *drm = encoder->dev;
390 struct vc4_dev *vc4 = to_vc4_dev(drm);
391 struct vc4_txp *txp = encoder_to_vc4_txp(encoder);
392 int idx;
393
394 if (!drm_dev_enter(dev: drm, idx: &idx))
395 return;
396
397 if (TXP_READ(TXP_DST_CTRL) & TXP_BUSY) {
398 unsigned long timeout = jiffies + msecs_to_jiffies(m: 1000);
399
400 TXP_WRITE(TXP_DST_CTRL, TXP_ABORT);
401
402 while (TXP_READ(TXP_DST_CTRL) & TXP_BUSY &&
403 time_before(jiffies, timeout))
404 ;
405
406 WARN_ON(TXP_READ(TXP_DST_CTRL) & TXP_BUSY);
407 }
408
409 if (vc4->gen < VC4_GEN_6_C)
410 TXP_WRITE(TXP_DST_CTRL, TXP_POWERDOWN);
411
412 drm_dev_exit(idx);
413}
414
415static const struct drm_encoder_helper_funcs vc4_txp_encoder_helper_funcs = {
416 .disable = vc4_txp_encoder_disable,
417};
418
419static int vc4_txp_enable_vblank(struct drm_crtc *crtc)
420{
421 return 0;
422}
423
424static void vc4_txp_disable_vblank(struct drm_crtc *crtc) {}
425
426static const struct drm_crtc_funcs vc4_txp_crtc_funcs = {
427 .set_config = drm_atomic_helper_set_config,
428 .page_flip = vc4_page_flip,
429 .reset = vc4_crtc_reset,
430 .atomic_duplicate_state = vc4_crtc_duplicate_state,
431 .atomic_destroy_state = vc4_crtc_destroy_state,
432 .enable_vblank = vc4_txp_enable_vblank,
433 .disable_vblank = vc4_txp_disable_vblank,
434 .late_register = vc4_crtc_late_register,
435};
436
437static int vc4_txp_atomic_check(struct drm_crtc *crtc,
438 struct drm_atomic_state *state)
439{
440 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
441 crtc);
442 int ret;
443
444 ret = vc4_hvs_atomic_check(crtc, state);
445 if (ret)
446 return ret;
447
448 crtc_state->no_vblank = true;
449
450 return 0;
451}
452
453static void vc4_txp_atomic_enable(struct drm_crtc *crtc,
454 struct drm_atomic_state *state)
455{
456 drm_crtc_vblank_on(crtc);
457 vc4_hvs_atomic_enable(crtc, state);
458}
459
460static void vc4_txp_atomic_disable(struct drm_crtc *crtc,
461 struct drm_atomic_state *state)
462{
463 struct drm_device *dev = crtc->dev;
464
465 /* Disable vblank irq handling before crtc is disabled. */
466 drm_crtc_vblank_off(crtc);
467
468 vc4_hvs_atomic_disable(crtc, state);
469
470 /*
471 * Make sure we issue a vblank event after disabling the CRTC if
472 * someone was waiting it.
473 */
474 if (crtc->state->event) {
475 unsigned long flags;
476
477 spin_lock_irqsave(&dev->event_lock, flags);
478 drm_crtc_send_vblank_event(crtc, e: crtc->state->event);
479 crtc->state->event = NULL;
480 spin_unlock_irqrestore(lock: &dev->event_lock, flags);
481 }
482}
483
484static const struct drm_crtc_helper_funcs vc4_txp_crtc_helper_funcs = {
485 .atomic_check = vc4_txp_atomic_check,
486 .atomic_begin = vc4_hvs_atomic_begin,
487 .atomic_flush = vc4_hvs_atomic_flush,
488 .atomic_enable = vc4_txp_atomic_enable,
489 .atomic_disable = vc4_txp_atomic_disable,
490};
491
492static irqreturn_t vc4_txp_interrupt(int irq, void *data)
493{
494 struct vc4_txp *txp = data;
495 struct vc4_crtc *vc4_crtc = &txp->base;
496
497 /*
498 * We don't need to protect the register access using
499 * drm_dev_enter() there because the interrupt handler lifetime
500 * is tied to the device itself, and not to the DRM device.
501 *
502 * So when the device will be gone, one of the first thing we
503 * will be doing will be to unregister the interrupt handler,
504 * and then unregister the DRM device. drm_dev_enter() would
505 * thus always succeed if we are here.
506 */
507 TXP_WRITE(TXP_DST_CTRL, TXP_READ(TXP_DST_CTRL) & ~TXP_EI);
508 vc4_crtc_handle_vblank(crtc: vc4_crtc);
509 drm_writeback_signal_completion(wb_connector: &txp->connector, status: 0);
510
511 return IRQ_HANDLED;
512}
513
514static const struct vc4_txp_data bcm2712_mop_data = {
515 .base = {
516 .name = "mop",
517 .debugfs_name = "mop_regs",
518 .hvs_available_channels = BIT(2),
519 .hvs_output = 2,
520 },
521 .encoder_type = VC4_ENCODER_TYPE_TXP0,
522 .high_addr_ptr_reg = TXP_DST_PTR_HIGH_MOP,
523 .has_byte_enable = true,
524 .size_minus_one = true,
525 .supports_40bit_addresses = true,
526};
527
528static const struct vc4_txp_data bcm2712_moplet_data = {
529 .base = {
530 .name = "moplet",
531 .debugfs_name = "moplet_regs",
532 .hvs_available_channels = BIT(1),
533 .hvs_output = 4,
534 },
535 .encoder_type = VC4_ENCODER_TYPE_TXP1,
536 .high_addr_ptr_reg = TXP_DST_PTR_HIGH_MOPLET,
537 .size_minus_one = true,
538 .supports_40bit_addresses = true,
539};
540
541const struct vc4_txp_data bcm2835_txp_data = {
542 .base = {
543 .name = "txp",
544 .debugfs_name = "txp_regs",
545 .hvs_available_channels = BIT(2),
546 .hvs_output = 2,
547 },
548 .encoder_type = VC4_ENCODER_TYPE_TXP0,
549 .has_byte_enable = true,
550};
551
552static int vc4_txp_bind(struct device *dev, struct device *master, void *data)
553{
554 struct platform_device *pdev = to_platform_device(dev);
555 struct drm_device *drm = dev_get_drvdata(dev: master);
556 const struct vc4_txp_data *txp_data;
557 struct vc4_encoder *vc4_encoder;
558 struct drm_encoder *encoder;
559 struct vc4_crtc *vc4_crtc;
560 struct vc4_txp *txp;
561 int ret, irq;
562
563 irq = platform_get_irq(pdev, 0);
564 if (irq < 0)
565 return irq;
566
567 txp = drmm_kzalloc(dev: drm, size: sizeof(*txp), GFP_KERNEL);
568 if (!txp)
569 return -ENOMEM;
570
571 txp_data = of_device_get_match_data(dev);
572 if (!txp_data)
573 return -ENODEV;
574
575 txp->data = txp_data;
576 txp->pdev = pdev;
577 txp->regs = vc4_ioremap_regs(dev: pdev, index: 0);
578 if (IS_ERR(ptr: txp->regs))
579 return PTR_ERR(ptr: txp->regs);
580
581 vc4_crtc = &txp->base;
582 vc4_crtc->regset.base = txp->regs;
583 vc4_crtc->regset.regs = txp_regs;
584 vc4_crtc->regset.nregs = ARRAY_SIZE(txp_regs);
585
586 ret = vc4_crtc_init(drm, pdev, vc4_crtc, data: &txp_data->base,
587 crtc_funcs: &vc4_txp_crtc_funcs, crtc_helper_funcs: &vc4_txp_crtc_helper_funcs, feeds_txp: true);
588 if (ret)
589 return ret;
590
591 vc4_encoder = &txp->encoder;
592 txp->encoder.type = txp_data->encoder_type;
593
594 encoder = &vc4_encoder->base;
595 encoder->possible_crtcs = drm_crtc_mask(crtc: &vc4_crtc->base);
596
597 drm_encoder_helper_add(encoder, funcs: &vc4_txp_encoder_helper_funcs);
598
599 ret = drmm_encoder_init(dev: drm, encoder, NULL, DRM_MODE_ENCODER_VIRTUAL, NULL);
600 if (ret)
601 return ret;
602
603 drm_connector_helper_add(connector: &txp->connector.base,
604 funcs: &vc4_txp_connector_helper_funcs);
605 ret = drm_writeback_connector_init_with_encoder(dev: drm, wb_connector: &txp->connector,
606 enc: encoder,
607 con_funcs: &vc4_txp_connector_funcs,
608 formats: drm_fmts, ARRAY_SIZE(drm_fmts));
609 if (ret)
610 return ret;
611
612 ret = devm_request_irq(dev, irq, handler: vc4_txp_interrupt, irqflags: 0,
613 devname: dev_name(dev), dev_id: txp);
614 if (ret)
615 return ret;
616
617 dev_set_drvdata(dev, data: txp);
618
619 return 0;
620}
621
622static void vc4_txp_unbind(struct device *dev, struct device *master,
623 void *data)
624{
625 struct vc4_txp *txp = dev_get_drvdata(dev);
626
627 drm_connector_cleanup(connector: &txp->connector.base);
628}
629
630static const struct component_ops vc4_txp_ops = {
631 .bind = vc4_txp_bind,
632 .unbind = vc4_txp_unbind,
633};
634
635static int vc4_txp_probe(struct platform_device *pdev)
636{
637 return component_add(&pdev->dev, &vc4_txp_ops);
638}
639
640static void vc4_txp_remove(struct platform_device *pdev)
641{
642 component_del(&pdev->dev, &vc4_txp_ops);
643}
644
645static const struct of_device_id vc4_txp_dt_match[] = {
646 { .compatible = "brcm,bcm2712-mop", .data = &bcm2712_mop_data },
647 { .compatible = "brcm,bcm2712-moplet", .data = &bcm2712_moplet_data },
648 { .compatible = "brcm,bcm2835-txp", .data = &bcm2835_txp_data },
649 { /* sentinel */ },
650};
651
652struct platform_driver vc4_txp_driver = {
653 .probe = vc4_txp_probe,
654 .remove = vc4_txp_remove,
655 .driver = {
656 .name = "vc4_txp",
657 .of_match_table = vc4_txp_dt_match,
658 },
659};
660

source code of linux/drivers/gpu/drm/vc4/vc4_txp.c