1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * TI CSI2RX Shim Wrapper Driver
4 *
5 * Copyright (C) 2023 Texas Instruments Incorporated - https://www.ti.com/
6 *
7 * Author: Pratyush Yadav <p.yadav@ti.com>
8 * Author: Jai Luthra <j-luthra@ti.com>
9 */
10
11 #include <linux/bitfield.h>
12 #include <linux/dmaengine.h>
13 #include <linux/module.h>
14 #include <linux/of_platform.h>
15 #include <linux/platform_device.h>
16
17 #include <media/mipi-csi2.h>
18 #include <media/v4l2-device.h>
19 #include <media/v4l2-ioctl.h>
20 #include <media/v4l2-mc.h>
21 #include <media/videobuf2-dma-contig.h>
22
23 #define TI_CSI2RX_MODULE_NAME "j721e-csi2rx"
24
25 #define SHIM_CNTL 0x10
26 #define SHIM_CNTL_PIX_RST BIT(0)
27
28 #define SHIM_DMACNTX 0x20
29 #define SHIM_DMACNTX_EN BIT(31)
30 #define SHIM_DMACNTX_YUV422 GENMASK(27, 26)
31 #define SHIM_DMACNTX_SIZE GENMASK(21, 20)
32 #define SHIM_DMACNTX_FMT GENMASK(5, 0)
33 #define SHIM_DMACNTX_YUV422_MODE_11 3
34 #define SHIM_DMACNTX_SIZE_8 0
35 #define SHIM_DMACNTX_SIZE_16 1
36 #define SHIM_DMACNTX_SIZE_32 2
37
38 #define SHIM_PSI_CFG0 0x24
39 #define SHIM_PSI_CFG0_SRC_TAG GENMASK(15, 0)
40 #define SHIM_PSI_CFG0_DST_TAG GENMASK(31, 16)
41
42 #define PSIL_WORD_SIZE_BYTES 16
43 /*
44 * There are no hard limits on the width or height. The DMA engine can handle
45 * all sizes. The max width and height are arbitrary numbers for this driver.
46 * Use 16K * 16K as the arbitrary limit. It is large enough that it is unlikely
47 * the limit will be hit in practice.
48 */
49 #define MAX_WIDTH_BYTES SZ_16K
50 #define MAX_HEIGHT_LINES SZ_16K
51
52 #define DRAIN_TIMEOUT_MS 50
53 #define DRAIN_BUFFER_SIZE SZ_32K
54
55 struct ti_csi2rx_fmt {
56 u32 fourcc; /* Four character code. */
57 u32 code; /* Mbus code. */
58 u32 csi_dt; /* CSI Data type. */
59 u8 bpp; /* Bits per pixel. */
60 u8 size; /* Data size shift when unpacking. */
61 };
62
63 struct ti_csi2rx_buffer {
64 /* Common v4l2 buffer. Must be first. */
65 struct vb2_v4l2_buffer vb;
66 struct list_head list;
67 struct ti_csi2rx_dev *csi;
68 };
69
70 enum ti_csi2rx_dma_state {
71 TI_CSI2RX_DMA_STOPPED, /* Streaming not started yet. */
72 TI_CSI2RX_DMA_IDLE, /* Streaming but no pending DMA operation. */
73 TI_CSI2RX_DMA_ACTIVE, /* Streaming and pending DMA operation. */
74 };
75
76 struct ti_csi2rx_dma {
77 /* Protects all fields in this struct. */
78 spinlock_t lock;
79 struct dma_chan *chan;
80 /* Buffers queued to the driver, waiting to be processed by DMA. */
81 struct list_head queue;
82 enum ti_csi2rx_dma_state state;
83 /*
84 * Queue of buffers submitted to DMA engine.
85 */
86 struct list_head submitted;
87 /* Buffer to drain stale data from PSI-L endpoint */
88 struct {
89 void *vaddr;
90 dma_addr_t paddr;
91 size_t len;
92 } drain;
93 };
94
95 struct ti_csi2rx_dev {
96 struct device *dev;
97 void __iomem *shim;
98 struct v4l2_device v4l2_dev;
99 struct video_device vdev;
100 struct media_device mdev;
101 struct media_pipeline pipe;
102 struct media_pad pad;
103 struct v4l2_async_notifier notifier;
104 struct v4l2_subdev *source;
105 struct vb2_queue vidq;
106 struct mutex mutex; /* To serialize ioctls. */
107 struct v4l2_format v_fmt;
108 struct ti_csi2rx_dma dma;
109 u32 sequence;
110 };
111
112 static const struct ti_csi2rx_fmt ti_csi2rx_formats[] = {
113 {
114 .fourcc = V4L2_PIX_FMT_YUYV,
115 .code = MEDIA_BUS_FMT_YUYV8_1X16,
116 .csi_dt = MIPI_CSI2_DT_YUV422_8B,
117 .bpp = 16,
118 .size = SHIM_DMACNTX_SIZE_8,
119 }, {
120 .fourcc = V4L2_PIX_FMT_UYVY,
121 .code = MEDIA_BUS_FMT_UYVY8_1X16,
122 .csi_dt = MIPI_CSI2_DT_YUV422_8B,
123 .bpp = 16,
124 .size = SHIM_DMACNTX_SIZE_8,
125 }, {
126 .fourcc = V4L2_PIX_FMT_YVYU,
127 .code = MEDIA_BUS_FMT_YVYU8_1X16,
128 .csi_dt = MIPI_CSI2_DT_YUV422_8B,
129 .bpp = 16,
130 .size = SHIM_DMACNTX_SIZE_8,
131 }, {
132 .fourcc = V4L2_PIX_FMT_VYUY,
133 .code = MEDIA_BUS_FMT_VYUY8_1X16,
134 .csi_dt = MIPI_CSI2_DT_YUV422_8B,
135 .bpp = 16,
136 .size = SHIM_DMACNTX_SIZE_8,
137 }, {
138 .fourcc = V4L2_PIX_FMT_SBGGR8,
139 .code = MEDIA_BUS_FMT_SBGGR8_1X8,
140 .csi_dt = MIPI_CSI2_DT_RAW8,
141 .bpp = 8,
142 .size = SHIM_DMACNTX_SIZE_8,
143 }, {
144 .fourcc = V4L2_PIX_FMT_SGBRG8,
145 .code = MEDIA_BUS_FMT_SGBRG8_1X8,
146 .csi_dt = MIPI_CSI2_DT_RAW8,
147 .bpp = 8,
148 .size = SHIM_DMACNTX_SIZE_8,
149 }, {
150 .fourcc = V4L2_PIX_FMT_SGRBG8,
151 .code = MEDIA_BUS_FMT_SGRBG8_1X8,
152 .csi_dt = MIPI_CSI2_DT_RAW8,
153 .bpp = 8,
154 .size = SHIM_DMACNTX_SIZE_8,
155 }, {
156 .fourcc = V4L2_PIX_FMT_SRGGB8,
157 .code = MEDIA_BUS_FMT_SRGGB8_1X8,
158 .csi_dt = MIPI_CSI2_DT_RAW8,
159 .bpp = 8,
160 .size = SHIM_DMACNTX_SIZE_8,
161 }, {
162 .fourcc = V4L2_PIX_FMT_GREY,
163 .code = MEDIA_BUS_FMT_Y8_1X8,
164 .csi_dt = MIPI_CSI2_DT_RAW8,
165 .bpp = 8,
166 .size = SHIM_DMACNTX_SIZE_8,
167 }, {
168 .fourcc = V4L2_PIX_FMT_SBGGR10,
169 .code = MEDIA_BUS_FMT_SBGGR10_1X10,
170 .csi_dt = MIPI_CSI2_DT_RAW10,
171 .bpp = 16,
172 .size = SHIM_DMACNTX_SIZE_16,
173 }, {
174 .fourcc = V4L2_PIX_FMT_SGBRG10,
175 .code = MEDIA_BUS_FMT_SGBRG10_1X10,
176 .csi_dt = MIPI_CSI2_DT_RAW10,
177 .bpp = 16,
178 .size = SHIM_DMACNTX_SIZE_16,
179 }, {
180 .fourcc = V4L2_PIX_FMT_SGRBG10,
181 .code = MEDIA_BUS_FMT_SGRBG10_1X10,
182 .csi_dt = MIPI_CSI2_DT_RAW10,
183 .bpp = 16,
184 .size = SHIM_DMACNTX_SIZE_16,
185 }, {
186 .fourcc = V4L2_PIX_FMT_SRGGB10,
187 .code = MEDIA_BUS_FMT_SRGGB10_1X10,
188 .csi_dt = MIPI_CSI2_DT_RAW10,
189 .bpp = 16,
190 .size = SHIM_DMACNTX_SIZE_16,
191 }, {
192 .fourcc = V4L2_PIX_FMT_RGB565X,
193 .code = MEDIA_BUS_FMT_RGB565_1X16,
194 .csi_dt = MIPI_CSI2_DT_RGB565,
195 .bpp = 16,
196 .size = SHIM_DMACNTX_SIZE_16,
197 }, {
198 .fourcc = V4L2_PIX_FMT_XBGR32,
199 .code = MEDIA_BUS_FMT_RGB888_1X24,
200 .csi_dt = MIPI_CSI2_DT_RGB888,
201 .bpp = 32,
202 .size = SHIM_DMACNTX_SIZE_32,
203 }, {
204 .fourcc = V4L2_PIX_FMT_RGBX32,
205 .code = MEDIA_BUS_FMT_BGR888_1X24,
206 .csi_dt = MIPI_CSI2_DT_RGB888,
207 .bpp = 32,
208 .size = SHIM_DMACNTX_SIZE_32,
209 },
210
211 /* More formats can be supported but they are not listed for now. */
212 };
213
214 /* Forward declaration needed by ti_csi2rx_dma_callback. */
215 static int ti_csi2rx_start_dma(struct ti_csi2rx_dev *csi,
216 struct ti_csi2rx_buffer *buf);
217
find_format_by_fourcc(u32 pixelformat)218 static const struct ti_csi2rx_fmt *find_format_by_fourcc(u32 pixelformat)
219 {
220 unsigned int i;
221
222 for (i = 0; i < ARRAY_SIZE(ti_csi2rx_formats); i++) {
223 if (ti_csi2rx_formats[i].fourcc == pixelformat)
224 return &ti_csi2rx_formats[i];
225 }
226
227 return NULL;
228 }
229
find_format_by_code(u32 code)230 static const struct ti_csi2rx_fmt *find_format_by_code(u32 code)
231 {
232 unsigned int i;
233
234 for (i = 0; i < ARRAY_SIZE(ti_csi2rx_formats); i++) {
235 if (ti_csi2rx_formats[i].code == code)
236 return &ti_csi2rx_formats[i];
237 }
238
239 return NULL;
240 }
241
ti_csi2rx_fill_fmt(const struct ti_csi2rx_fmt * csi_fmt,struct v4l2_format * v4l2_fmt)242 static void ti_csi2rx_fill_fmt(const struct ti_csi2rx_fmt *csi_fmt,
243 struct v4l2_format *v4l2_fmt)
244 {
245 struct v4l2_pix_format *pix = &v4l2_fmt->fmt.pix;
246 unsigned int pixels_in_word;
247
248 pixels_in_word = PSIL_WORD_SIZE_BYTES * 8 / csi_fmt->bpp;
249
250 /* Clamp width and height to sensible maximums (16K x 16K) */
251 pix->width = clamp_t(unsigned int, pix->width,
252 pixels_in_word,
253 MAX_WIDTH_BYTES * 8 / csi_fmt->bpp);
254 pix->height = clamp_t(unsigned int, pix->height, 1, MAX_HEIGHT_LINES);
255
256 /* Width should be a multiple of transfer word-size */
257 pix->width = rounddown(pix->width, pixels_in_word);
258
259 v4l2_fmt->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
260 pix->pixelformat = csi_fmt->fourcc;
261 pix->bytesperline = pix->width * (csi_fmt->bpp / 8);
262 pix->sizeimage = pix->bytesperline * pix->height;
263 }
264
ti_csi2rx_querycap(struct file * file,void * priv,struct v4l2_capability * cap)265 static int ti_csi2rx_querycap(struct file *file, void *priv,
266 struct v4l2_capability *cap)
267 {
268 strscpy(cap->driver, TI_CSI2RX_MODULE_NAME, sizeof(cap->driver));
269 strscpy(cap->card, TI_CSI2RX_MODULE_NAME, sizeof(cap->card));
270
271 return 0;
272 }
273
ti_csi2rx_enum_fmt_vid_cap(struct file * file,void * priv,struct v4l2_fmtdesc * f)274 static int ti_csi2rx_enum_fmt_vid_cap(struct file *file, void *priv,
275 struct v4l2_fmtdesc *f)
276 {
277 const struct ti_csi2rx_fmt *fmt = NULL;
278
279 if (f->mbus_code) {
280 /* 1-to-1 mapping between bus formats and pixel formats */
281 if (f->index > 0)
282 return -EINVAL;
283
284 fmt = find_format_by_code(f->mbus_code);
285 } else {
286 if (f->index >= ARRAY_SIZE(ti_csi2rx_formats))
287 return -EINVAL;
288
289 fmt = &ti_csi2rx_formats[f->index];
290 }
291
292 if (!fmt)
293 return -EINVAL;
294
295 f->pixelformat = fmt->fourcc;
296 memset(f->reserved, 0, sizeof(f->reserved));
297 f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
298
299 return 0;
300 }
301
ti_csi2rx_g_fmt_vid_cap(struct file * file,void * prov,struct v4l2_format * f)302 static int ti_csi2rx_g_fmt_vid_cap(struct file *file, void *prov,
303 struct v4l2_format *f)
304 {
305 struct ti_csi2rx_dev *csi = video_drvdata(file);
306
307 *f = csi->v_fmt;
308
309 return 0;
310 }
311
ti_csi2rx_try_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)312 static int ti_csi2rx_try_fmt_vid_cap(struct file *file, void *priv,
313 struct v4l2_format *f)
314 {
315 const struct ti_csi2rx_fmt *fmt;
316
317 /*
318 * Default to the first format if the requested pixel format code isn't
319 * supported.
320 */
321 fmt = find_format_by_fourcc(f->fmt.pix.pixelformat);
322 if (!fmt)
323 fmt = &ti_csi2rx_formats[0];
324
325 /* Interlaced formats are not supported. */
326 f->fmt.pix.field = V4L2_FIELD_NONE;
327
328 ti_csi2rx_fill_fmt(fmt, f);
329
330 return 0;
331 }
332
ti_csi2rx_s_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)333 static int ti_csi2rx_s_fmt_vid_cap(struct file *file, void *priv,
334 struct v4l2_format *f)
335 {
336 struct ti_csi2rx_dev *csi = video_drvdata(file);
337 struct vb2_queue *q = &csi->vidq;
338 int ret;
339
340 if (vb2_is_busy(q))
341 return -EBUSY;
342
343 ret = ti_csi2rx_try_fmt_vid_cap(file, priv, f);
344 if (ret < 0)
345 return ret;
346
347 csi->v_fmt = *f;
348
349 return 0;
350 }
351
ti_csi2rx_enum_framesizes(struct file * file,void * fh,struct v4l2_frmsizeenum * fsize)352 static int ti_csi2rx_enum_framesizes(struct file *file, void *fh,
353 struct v4l2_frmsizeenum *fsize)
354 {
355 const struct ti_csi2rx_fmt *fmt;
356 unsigned int pixels_in_word;
357
358 fmt = find_format_by_fourcc(fsize->pixel_format);
359 if (!fmt || fsize->index != 0)
360 return -EINVAL;
361
362 /*
363 * Number of pixels in one PSI-L word. The transfer happens in multiples
364 * of PSI-L word sizes.
365 */
366 pixels_in_word = PSIL_WORD_SIZE_BYTES * 8 / fmt->bpp;
367
368 fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
369 fsize->stepwise.min_width = pixels_in_word;
370 fsize->stepwise.max_width = rounddown(MAX_WIDTH_BYTES * 8 / fmt->bpp,
371 pixels_in_word);
372 fsize->stepwise.step_width = pixels_in_word;
373 fsize->stepwise.min_height = 1;
374 fsize->stepwise.max_height = MAX_HEIGHT_LINES;
375 fsize->stepwise.step_height = 1;
376
377 return 0;
378 }
379
380 static const struct v4l2_ioctl_ops csi_ioctl_ops = {
381 .vidioc_querycap = ti_csi2rx_querycap,
382 .vidioc_enum_fmt_vid_cap = ti_csi2rx_enum_fmt_vid_cap,
383 .vidioc_try_fmt_vid_cap = ti_csi2rx_try_fmt_vid_cap,
384 .vidioc_g_fmt_vid_cap = ti_csi2rx_g_fmt_vid_cap,
385 .vidioc_s_fmt_vid_cap = ti_csi2rx_s_fmt_vid_cap,
386 .vidioc_enum_framesizes = ti_csi2rx_enum_framesizes,
387 .vidioc_reqbufs = vb2_ioctl_reqbufs,
388 .vidioc_create_bufs = vb2_ioctl_create_bufs,
389 .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
390 .vidioc_querybuf = vb2_ioctl_querybuf,
391 .vidioc_qbuf = vb2_ioctl_qbuf,
392 .vidioc_dqbuf = vb2_ioctl_dqbuf,
393 .vidioc_expbuf = vb2_ioctl_expbuf,
394 .vidioc_streamon = vb2_ioctl_streamon,
395 .vidioc_streamoff = vb2_ioctl_streamoff,
396 };
397
398 static const struct v4l2_file_operations csi_fops = {
399 .owner = THIS_MODULE,
400 .open = v4l2_fh_open,
401 .release = vb2_fop_release,
402 .read = vb2_fop_read,
403 .poll = vb2_fop_poll,
404 .unlocked_ioctl = video_ioctl2,
405 .mmap = vb2_fop_mmap,
406 };
407
csi_async_notifier_bound(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asc)408 static int csi_async_notifier_bound(struct v4l2_async_notifier *notifier,
409 struct v4l2_subdev *subdev,
410 struct v4l2_async_connection *asc)
411 {
412 struct ti_csi2rx_dev *csi = dev_get_drvdata(notifier->v4l2_dev->dev);
413
414 csi->source = subdev;
415
416 return 0;
417 }
418
csi_async_notifier_complete(struct v4l2_async_notifier * notifier)419 static int csi_async_notifier_complete(struct v4l2_async_notifier *notifier)
420 {
421 struct ti_csi2rx_dev *csi = dev_get_drvdata(notifier->v4l2_dev->dev);
422 struct video_device *vdev = &csi->vdev;
423 int ret;
424
425 ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
426 if (ret)
427 return ret;
428
429 ret = v4l2_create_fwnode_links_to_pad(csi->source, &csi->pad,
430 MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
431
432 if (ret) {
433 video_unregister_device(vdev);
434 return ret;
435 }
436
437 ret = v4l2_device_register_subdev_nodes(&csi->v4l2_dev);
438 if (ret)
439 video_unregister_device(vdev);
440
441 return ret;
442 }
443
444 static const struct v4l2_async_notifier_operations csi_async_notifier_ops = {
445 .bound = csi_async_notifier_bound,
446 .complete = csi_async_notifier_complete,
447 };
448
ti_csi2rx_notifier_register(struct ti_csi2rx_dev * csi)449 static int ti_csi2rx_notifier_register(struct ti_csi2rx_dev *csi)
450 {
451 struct fwnode_handle *fwnode;
452 struct v4l2_async_connection *asc;
453 struct device_node *node;
454 int ret;
455
456 node = of_get_child_by_name(csi->dev->of_node, "csi-bridge");
457 if (!node)
458 return -EINVAL;
459
460 fwnode = of_fwnode_handle(node);
461 if (!fwnode) {
462 of_node_put(node);
463 return -EINVAL;
464 }
465
466 v4l2_async_nf_init(&csi->notifier, &csi->v4l2_dev);
467 csi->notifier.ops = &csi_async_notifier_ops;
468
469 asc = v4l2_async_nf_add_fwnode(&csi->notifier, fwnode,
470 struct v4l2_async_connection);
471 of_node_put(node);
472 if (IS_ERR(asc)) {
473 v4l2_async_nf_cleanup(&csi->notifier);
474 return PTR_ERR(asc);
475 }
476
477 ret = v4l2_async_nf_register(&csi->notifier);
478 if (ret) {
479 v4l2_async_nf_cleanup(&csi->notifier);
480 return ret;
481 }
482
483 return 0;
484 }
485
ti_csi2rx_setup_shim(struct ti_csi2rx_dev * csi)486 static void ti_csi2rx_setup_shim(struct ti_csi2rx_dev *csi)
487 {
488 const struct ti_csi2rx_fmt *fmt;
489 unsigned int reg;
490
491 fmt = find_format_by_fourcc(csi->v_fmt.fmt.pix.pixelformat);
492
493 /* De-assert the pixel interface reset. */
494 reg = SHIM_CNTL_PIX_RST;
495 writel(reg, csi->shim + SHIM_CNTL);
496
497 reg = SHIM_DMACNTX_EN;
498 reg |= FIELD_PREP(SHIM_DMACNTX_FMT, fmt->csi_dt);
499
500 /*
501 * The hardware assumes incoming YUV422 8-bit data on MIPI CSI2 bus
502 * follows the spec and is packed in the order U0 -> Y0 -> V0 -> Y1 ->
503 * ...
504 *
505 * There is an option to swap the bytes around before storing in
506 * memory, to achieve different pixel formats:
507 *
508 * Byte3 <----------- Byte0
509 * [ Y1 ][ V0 ][ Y0 ][ U0 ] MODE 11
510 * [ Y1 ][ U0 ][ Y0 ][ V0 ] MODE 10
511 * [ V0 ][ Y1 ][ U0 ][ Y0 ] MODE 01
512 * [ U0 ][ Y1 ][ V0 ][ Y0 ] MODE 00
513 *
514 * We don't have any requirement to change pixelformat from what is
515 * coming from the source, so we keep it in MODE 11, which does not
516 * swap any bytes when storing in memory.
517 */
518 switch (fmt->fourcc) {
519 case V4L2_PIX_FMT_UYVY:
520 case V4L2_PIX_FMT_VYUY:
521 case V4L2_PIX_FMT_YUYV:
522 case V4L2_PIX_FMT_YVYU:
523 reg |= FIELD_PREP(SHIM_DMACNTX_YUV422,
524 SHIM_DMACNTX_YUV422_MODE_11);
525 break;
526 default:
527 /* Ignore if not YUV 4:2:2 */
528 break;
529 }
530
531 reg |= FIELD_PREP(SHIM_DMACNTX_SIZE, fmt->size);
532
533 writel(reg, csi->shim + SHIM_DMACNTX);
534
535 reg = FIELD_PREP(SHIM_PSI_CFG0_SRC_TAG, 0) |
536 FIELD_PREP(SHIM_PSI_CFG0_DST_TAG, 0);
537 writel(reg, csi->shim + SHIM_PSI_CFG0);
538 }
539
ti_csi2rx_drain_callback(void * param)540 static void ti_csi2rx_drain_callback(void *param)
541 {
542 struct completion *drain_complete = param;
543
544 complete(drain_complete);
545 }
546
547 /*
548 * Drain the stale data left at the PSI-L endpoint.
549 *
550 * This might happen if no buffers are queued in time but source is still
551 * streaming. In multi-stream scenarios this can happen when one stream is
552 * stopped but other is still streaming, and thus module-level pixel reset is
553 * not asserted.
554 *
555 * To prevent that stale data corrupting the subsequent transactions, it is
556 * required to issue DMA requests to drain it out.
557 */
ti_csi2rx_drain_dma(struct ti_csi2rx_dev * csi)558 static int ti_csi2rx_drain_dma(struct ti_csi2rx_dev *csi)
559 {
560 struct dma_async_tx_descriptor *desc;
561 struct completion drain_complete;
562 dma_cookie_t cookie;
563 int ret;
564
565 init_completion(&drain_complete);
566
567 desc = dmaengine_prep_slave_single(csi->dma.chan, csi->dma.drain.paddr,
568 csi->dma.drain.len, DMA_DEV_TO_MEM,
569 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
570 if (!desc) {
571 ret = -EIO;
572 goto out;
573 }
574
575 desc->callback = ti_csi2rx_drain_callback;
576 desc->callback_param = &drain_complete;
577
578 cookie = dmaengine_submit(desc);
579 ret = dma_submit_error(cookie);
580 if (ret)
581 goto out;
582
583 dma_async_issue_pending(csi->dma.chan);
584
585 if (!wait_for_completion_timeout(&drain_complete,
586 msecs_to_jiffies(DRAIN_TIMEOUT_MS))) {
587 dmaengine_terminate_sync(csi->dma.chan);
588 dev_dbg(csi->dev, "DMA transfer timed out for drain buffer\n");
589 ret = -ETIMEDOUT;
590 goto out;
591 }
592 out:
593 return ret;
594 }
595
ti_csi2rx_dma_callback(void * param)596 static void ti_csi2rx_dma_callback(void *param)
597 {
598 struct ti_csi2rx_buffer *buf = param;
599 struct ti_csi2rx_dev *csi = buf->csi;
600 struct ti_csi2rx_dma *dma = &csi->dma;
601 unsigned long flags;
602
603 /*
604 * TODO: Derive the sequence number from the CSI2RX frame number
605 * hardware monitor registers.
606 */
607 buf->vb.vb2_buf.timestamp = ktime_get_ns();
608 buf->vb.sequence = csi->sequence++;
609
610 spin_lock_irqsave(&dma->lock, flags);
611
612 WARN_ON(!list_is_first(&buf->list, &dma->submitted));
613 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
614 list_del(&buf->list);
615
616 /* If there are more buffers to process then start their transfer. */
617 while (!list_empty(&dma->queue)) {
618 buf = list_entry(dma->queue.next, struct ti_csi2rx_buffer, list);
619
620 if (ti_csi2rx_start_dma(csi, buf)) {
621 dev_err(csi->dev, "Failed to queue the next buffer for DMA\n");
622 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
623 } else {
624 list_move_tail(&buf->list, &dma->submitted);
625 }
626 }
627
628 if (list_empty(&dma->submitted))
629 dma->state = TI_CSI2RX_DMA_IDLE;
630
631 spin_unlock_irqrestore(&dma->lock, flags);
632 }
633
ti_csi2rx_start_dma(struct ti_csi2rx_dev * csi,struct ti_csi2rx_buffer * buf)634 static int ti_csi2rx_start_dma(struct ti_csi2rx_dev *csi,
635 struct ti_csi2rx_buffer *buf)
636 {
637 unsigned long addr;
638 struct dma_async_tx_descriptor *desc;
639 size_t len = csi->v_fmt.fmt.pix.sizeimage;
640 dma_cookie_t cookie;
641 int ret = 0;
642
643 addr = vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
644 desc = dmaengine_prep_slave_single(csi->dma.chan, addr, len,
645 DMA_DEV_TO_MEM,
646 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
647 if (!desc)
648 return -EIO;
649
650 desc->callback = ti_csi2rx_dma_callback;
651 desc->callback_param = buf;
652
653 cookie = dmaengine_submit(desc);
654 ret = dma_submit_error(cookie);
655 if (ret)
656 return ret;
657
658 dma_async_issue_pending(csi->dma.chan);
659
660 return 0;
661 }
662
ti_csi2rx_stop_dma(struct ti_csi2rx_dev * csi)663 static void ti_csi2rx_stop_dma(struct ti_csi2rx_dev *csi)
664 {
665 struct ti_csi2rx_dma *dma = &csi->dma;
666 enum ti_csi2rx_dma_state state;
667 unsigned long flags;
668 int ret;
669
670 spin_lock_irqsave(&dma->lock, flags);
671 state = csi->dma.state;
672 dma->state = TI_CSI2RX_DMA_STOPPED;
673 spin_unlock_irqrestore(&dma->lock, flags);
674
675 if (state != TI_CSI2RX_DMA_STOPPED) {
676 /*
677 * Normal DMA termination does not clean up pending data on
678 * the endpoint if multiple streams are running and only one
679 * is stopped, as the module-level pixel reset cannot be
680 * enforced before terminating DMA.
681 */
682 ret = ti_csi2rx_drain_dma(csi);
683 if (ret && ret != -ETIMEDOUT)
684 dev_warn(csi->dev,
685 "Failed to drain DMA. Next frame might be bogus\n");
686 }
687
688 ret = dmaengine_terminate_sync(csi->dma.chan);
689 if (ret)
690 dev_err(csi->dev, "Failed to stop DMA: %d\n", ret);
691 }
692
ti_csi2rx_cleanup_buffers(struct ti_csi2rx_dev * csi,enum vb2_buffer_state state)693 static void ti_csi2rx_cleanup_buffers(struct ti_csi2rx_dev *csi,
694 enum vb2_buffer_state state)
695 {
696 struct ti_csi2rx_dma *dma = &csi->dma;
697 struct ti_csi2rx_buffer *buf, *tmp;
698 unsigned long flags;
699
700 spin_lock_irqsave(&dma->lock, flags);
701 list_for_each_entry_safe(buf, tmp, &csi->dma.queue, list) {
702 list_del(&buf->list);
703 vb2_buffer_done(&buf->vb.vb2_buf, state);
704 }
705 list_for_each_entry_safe(buf, tmp, &csi->dma.submitted, list) {
706 list_del(&buf->list);
707 vb2_buffer_done(&buf->vb.vb2_buf, state);
708 }
709 spin_unlock_irqrestore(&dma->lock, flags);
710 }
711
ti_csi2rx_queue_setup(struct vb2_queue * q,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],struct device * alloc_devs[])712 static int ti_csi2rx_queue_setup(struct vb2_queue *q, unsigned int *nbuffers,
713 unsigned int *nplanes, unsigned int sizes[],
714 struct device *alloc_devs[])
715 {
716 struct ti_csi2rx_dev *csi = vb2_get_drv_priv(q);
717 unsigned int size = csi->v_fmt.fmt.pix.sizeimage;
718
719 if (*nplanes) {
720 if (sizes[0] < size)
721 return -EINVAL;
722 size = sizes[0];
723 }
724
725 *nplanes = 1;
726 sizes[0] = size;
727
728 return 0;
729 }
730
ti_csi2rx_buffer_prepare(struct vb2_buffer * vb)731 static int ti_csi2rx_buffer_prepare(struct vb2_buffer *vb)
732 {
733 struct ti_csi2rx_dev *csi = vb2_get_drv_priv(vb->vb2_queue);
734 unsigned long size = csi->v_fmt.fmt.pix.sizeimage;
735
736 if (vb2_plane_size(vb, 0) < size) {
737 dev_err(csi->dev, "Data will not fit into plane\n");
738 return -EINVAL;
739 }
740
741 vb2_set_plane_payload(vb, 0, size);
742 return 0;
743 }
744
ti_csi2rx_buffer_queue(struct vb2_buffer * vb)745 static void ti_csi2rx_buffer_queue(struct vb2_buffer *vb)
746 {
747 struct ti_csi2rx_dev *csi = vb2_get_drv_priv(vb->vb2_queue);
748 struct ti_csi2rx_buffer *buf;
749 struct ti_csi2rx_dma *dma = &csi->dma;
750 bool restart_dma = false;
751 unsigned long flags = 0;
752 int ret;
753
754 buf = container_of(vb, struct ti_csi2rx_buffer, vb.vb2_buf);
755 buf->csi = csi;
756
757 spin_lock_irqsave(&dma->lock, flags);
758 /*
759 * Usually the DMA callback takes care of queueing the pending buffers.
760 * But if DMA has stalled due to lack of buffers, restart it now.
761 */
762 if (dma->state == TI_CSI2RX_DMA_IDLE) {
763 /*
764 * Do not restart DMA with the lock held because
765 * ti_csi2rx_drain_dma() might block for completion.
766 * There won't be a race on queueing DMA anyway since the
767 * callback is not being fired.
768 */
769 restart_dma = true;
770 dma->state = TI_CSI2RX_DMA_ACTIVE;
771 } else {
772 list_add_tail(&buf->list, &dma->queue);
773 }
774 spin_unlock_irqrestore(&dma->lock, flags);
775
776 if (restart_dma) {
777 /*
778 * Once frames start dropping, some data gets stuck in the DMA
779 * pipeline somewhere. So the first DMA transfer after frame
780 * drops gives a partial frame. This is obviously not useful to
781 * the application and will only confuse it. Issue a DMA
782 * transaction to drain that up.
783 */
784 ret = ti_csi2rx_drain_dma(csi);
785 if (ret && ret != -ETIMEDOUT)
786 dev_warn(csi->dev,
787 "Failed to drain DMA. Next frame might be bogus\n");
788
789 spin_lock_irqsave(&dma->lock, flags);
790 ret = ti_csi2rx_start_dma(csi, buf);
791 if (ret) {
792 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
793 dma->state = TI_CSI2RX_DMA_IDLE;
794 spin_unlock_irqrestore(&dma->lock, flags);
795 dev_err(csi->dev, "Failed to start DMA: %d\n", ret);
796 } else {
797 list_add_tail(&buf->list, &dma->submitted);
798 spin_unlock_irqrestore(&dma->lock, flags);
799 }
800 }
801 }
802
ti_csi2rx_start_streaming(struct vb2_queue * vq,unsigned int count)803 static int ti_csi2rx_start_streaming(struct vb2_queue *vq, unsigned int count)
804 {
805 struct ti_csi2rx_dev *csi = vb2_get_drv_priv(vq);
806 struct ti_csi2rx_dma *dma = &csi->dma;
807 struct ti_csi2rx_buffer *buf;
808 unsigned long flags;
809 int ret = 0;
810
811 spin_lock_irqsave(&dma->lock, flags);
812 if (list_empty(&dma->queue))
813 ret = -EIO;
814 spin_unlock_irqrestore(&dma->lock, flags);
815 if (ret)
816 return ret;
817
818 ret = video_device_pipeline_start(&csi->vdev, &csi->pipe);
819 if (ret)
820 goto err;
821
822 ti_csi2rx_setup_shim(csi);
823
824 csi->sequence = 0;
825
826 spin_lock_irqsave(&dma->lock, flags);
827 buf = list_entry(dma->queue.next, struct ti_csi2rx_buffer, list);
828
829 ret = ti_csi2rx_start_dma(csi, buf);
830 if (ret) {
831 dev_err(csi->dev, "Failed to start DMA: %d\n", ret);
832 spin_unlock_irqrestore(&dma->lock, flags);
833 goto err_pipeline;
834 }
835
836 list_move_tail(&buf->list, &dma->submitted);
837 dma->state = TI_CSI2RX_DMA_ACTIVE;
838 spin_unlock_irqrestore(&dma->lock, flags);
839
840 ret = v4l2_subdev_call(csi->source, video, s_stream, 1);
841 if (ret)
842 goto err_dma;
843
844 return 0;
845
846 err_dma:
847 ti_csi2rx_stop_dma(csi);
848 err_pipeline:
849 video_device_pipeline_stop(&csi->vdev);
850 writel(0, csi->shim + SHIM_CNTL);
851 writel(0, csi->shim + SHIM_DMACNTX);
852 err:
853 ti_csi2rx_cleanup_buffers(csi, VB2_BUF_STATE_QUEUED);
854 return ret;
855 }
856
ti_csi2rx_stop_streaming(struct vb2_queue * vq)857 static void ti_csi2rx_stop_streaming(struct vb2_queue *vq)
858 {
859 struct ti_csi2rx_dev *csi = vb2_get_drv_priv(vq);
860 int ret;
861
862 video_device_pipeline_stop(&csi->vdev);
863
864 writel(0, csi->shim + SHIM_CNTL);
865 writel(0, csi->shim + SHIM_DMACNTX);
866
867 ret = v4l2_subdev_call(csi->source, video, s_stream, 0);
868 if (ret)
869 dev_err(csi->dev, "Failed to stop subdev stream\n");
870
871 ti_csi2rx_stop_dma(csi);
872 ti_csi2rx_cleanup_buffers(csi, VB2_BUF_STATE_ERROR);
873 }
874
875 static const struct vb2_ops csi_vb2_qops = {
876 .queue_setup = ti_csi2rx_queue_setup,
877 .buf_prepare = ti_csi2rx_buffer_prepare,
878 .buf_queue = ti_csi2rx_buffer_queue,
879 .start_streaming = ti_csi2rx_start_streaming,
880 .stop_streaming = ti_csi2rx_stop_streaming,
881 .wait_prepare = vb2_ops_wait_prepare,
882 .wait_finish = vb2_ops_wait_finish,
883 };
884
ti_csi2rx_init_vb2q(struct ti_csi2rx_dev * csi)885 static int ti_csi2rx_init_vb2q(struct ti_csi2rx_dev *csi)
886 {
887 struct vb2_queue *q = &csi->vidq;
888 int ret;
889
890 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
891 q->io_modes = VB2_MMAP | VB2_DMABUF;
892 q->drv_priv = csi;
893 q->buf_struct_size = sizeof(struct ti_csi2rx_buffer);
894 q->ops = &csi_vb2_qops;
895 q->mem_ops = &vb2_dma_contig_memops;
896 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
897 q->dev = dmaengine_get_dma_device(csi->dma.chan);
898 q->lock = &csi->mutex;
899 q->min_queued_buffers = 1;
900
901 ret = vb2_queue_init(q);
902 if (ret)
903 return ret;
904
905 csi->vdev.queue = q;
906
907 return 0;
908 }
909
ti_csi2rx_link_validate(struct media_link * link)910 static int ti_csi2rx_link_validate(struct media_link *link)
911 {
912 struct media_entity *entity = link->sink->entity;
913 struct video_device *vdev = media_entity_to_video_device(entity);
914 struct ti_csi2rx_dev *csi = container_of(vdev, struct ti_csi2rx_dev, vdev);
915 struct v4l2_pix_format *csi_fmt = &csi->v_fmt.fmt.pix;
916 struct v4l2_subdev_format source_fmt = {
917 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
918 .pad = link->source->index,
919 };
920 const struct ti_csi2rx_fmt *ti_fmt;
921 int ret;
922
923 ret = v4l2_subdev_call_state_active(csi->source, pad,
924 get_fmt, &source_fmt);
925 if (ret)
926 return ret;
927
928 if (source_fmt.format.width != csi_fmt->width) {
929 dev_dbg(csi->dev, "Width does not match (source %u, sink %u)\n",
930 source_fmt.format.width, csi_fmt->width);
931 return -EPIPE;
932 }
933
934 if (source_fmt.format.height != csi_fmt->height) {
935 dev_dbg(csi->dev, "Height does not match (source %u, sink %u)\n",
936 source_fmt.format.height, csi_fmt->height);
937 return -EPIPE;
938 }
939
940 if (source_fmt.format.field != csi_fmt->field &&
941 csi_fmt->field != V4L2_FIELD_NONE) {
942 dev_dbg(csi->dev, "Field does not match (source %u, sink %u)\n",
943 source_fmt.format.field, csi_fmt->field);
944 return -EPIPE;
945 }
946
947 ti_fmt = find_format_by_code(source_fmt.format.code);
948 if (!ti_fmt) {
949 dev_dbg(csi->dev, "Media bus format 0x%x not supported\n",
950 source_fmt.format.code);
951 return -EPIPE;
952 }
953
954 if (ti_fmt->fourcc != csi_fmt->pixelformat) {
955 dev_dbg(csi->dev,
956 "Cannot transform source fmt 0x%x to sink fmt 0x%x\n",
957 ti_fmt->fourcc, csi_fmt->pixelformat);
958 return -EPIPE;
959 }
960
961 return 0;
962 }
963
964 static const struct media_entity_operations ti_csi2rx_video_entity_ops = {
965 .link_validate = ti_csi2rx_link_validate,
966 };
967
ti_csi2rx_init_dma(struct ti_csi2rx_dev * csi)968 static int ti_csi2rx_init_dma(struct ti_csi2rx_dev *csi)
969 {
970 struct dma_slave_config cfg = {
971 .src_addr_width = DMA_SLAVE_BUSWIDTH_16_BYTES,
972 };
973 int ret;
974
975 INIT_LIST_HEAD(&csi->dma.queue);
976 INIT_LIST_HEAD(&csi->dma.submitted);
977 spin_lock_init(&csi->dma.lock);
978
979 csi->dma.state = TI_CSI2RX_DMA_STOPPED;
980
981 csi->dma.chan = dma_request_chan(csi->dev, "rx0");
982 if (IS_ERR(csi->dma.chan))
983 return PTR_ERR(csi->dma.chan);
984
985 ret = dmaengine_slave_config(csi->dma.chan, &cfg);
986 if (ret) {
987 dma_release_channel(csi->dma.chan);
988 return ret;
989 }
990
991 csi->dma.drain.len = DRAIN_BUFFER_SIZE;
992 csi->dma.drain.vaddr = dma_alloc_coherent(csi->dev, csi->dma.drain.len,
993 &csi->dma.drain.paddr,
994 GFP_KERNEL);
995 if (!csi->dma.drain.vaddr)
996 return -ENOMEM;
997
998 return 0;
999 }
1000
ti_csi2rx_v4l2_init(struct ti_csi2rx_dev * csi)1001 static int ti_csi2rx_v4l2_init(struct ti_csi2rx_dev *csi)
1002 {
1003 struct media_device *mdev = &csi->mdev;
1004 struct video_device *vdev = &csi->vdev;
1005 const struct ti_csi2rx_fmt *fmt;
1006 struct v4l2_pix_format *pix_fmt = &csi->v_fmt.fmt.pix;
1007 int ret;
1008
1009 fmt = find_format_by_fourcc(V4L2_PIX_FMT_UYVY);
1010 if (!fmt)
1011 return -EINVAL;
1012
1013 pix_fmt->width = 640;
1014 pix_fmt->height = 480;
1015 pix_fmt->field = V4L2_FIELD_NONE;
1016 pix_fmt->colorspace = V4L2_COLORSPACE_SRGB;
1017 pix_fmt->ycbcr_enc = V4L2_YCBCR_ENC_601,
1018 pix_fmt->quantization = V4L2_QUANTIZATION_LIM_RANGE,
1019 pix_fmt->xfer_func = V4L2_XFER_FUNC_SRGB,
1020
1021 ti_csi2rx_fill_fmt(fmt, &csi->v_fmt);
1022
1023 mdev->dev = csi->dev;
1024 mdev->hw_revision = 1;
1025 strscpy(mdev->model, "TI-CSI2RX", sizeof(mdev->model));
1026
1027 media_device_init(mdev);
1028
1029 strscpy(vdev->name, TI_CSI2RX_MODULE_NAME, sizeof(vdev->name));
1030 vdev->v4l2_dev = &csi->v4l2_dev;
1031 vdev->vfl_dir = VFL_DIR_RX;
1032 vdev->fops = &csi_fops;
1033 vdev->ioctl_ops = &csi_ioctl_ops;
1034 vdev->release = video_device_release_empty;
1035 vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
1036 V4L2_CAP_IO_MC;
1037 vdev->lock = &csi->mutex;
1038 video_set_drvdata(vdev, csi);
1039
1040 csi->pad.flags = MEDIA_PAD_FL_SINK;
1041 vdev->entity.ops = &ti_csi2rx_video_entity_ops;
1042 ret = media_entity_pads_init(&csi->vdev.entity, 1, &csi->pad);
1043 if (ret)
1044 return ret;
1045
1046 csi->v4l2_dev.mdev = mdev;
1047
1048 ret = v4l2_device_register(csi->dev, &csi->v4l2_dev);
1049 if (ret)
1050 return ret;
1051
1052 ret = media_device_register(mdev);
1053 if (ret) {
1054 v4l2_device_unregister(&csi->v4l2_dev);
1055 media_device_cleanup(mdev);
1056 return ret;
1057 }
1058
1059 return 0;
1060 }
1061
ti_csi2rx_cleanup_dma(struct ti_csi2rx_dev * csi)1062 static void ti_csi2rx_cleanup_dma(struct ti_csi2rx_dev *csi)
1063 {
1064 dma_free_coherent(csi->dev, csi->dma.drain.len,
1065 csi->dma.drain.vaddr, csi->dma.drain.paddr);
1066 csi->dma.drain.vaddr = NULL;
1067 dma_release_channel(csi->dma.chan);
1068 }
1069
ti_csi2rx_cleanup_v4l2(struct ti_csi2rx_dev * csi)1070 static void ti_csi2rx_cleanup_v4l2(struct ti_csi2rx_dev *csi)
1071 {
1072 media_device_unregister(&csi->mdev);
1073 v4l2_device_unregister(&csi->v4l2_dev);
1074 media_device_cleanup(&csi->mdev);
1075 }
1076
ti_csi2rx_cleanup_subdev(struct ti_csi2rx_dev * csi)1077 static void ti_csi2rx_cleanup_subdev(struct ti_csi2rx_dev *csi)
1078 {
1079 v4l2_async_nf_unregister(&csi->notifier);
1080 v4l2_async_nf_cleanup(&csi->notifier);
1081 }
1082
ti_csi2rx_cleanup_vb2q(struct ti_csi2rx_dev * csi)1083 static void ti_csi2rx_cleanup_vb2q(struct ti_csi2rx_dev *csi)
1084 {
1085 vb2_queue_release(&csi->vidq);
1086 }
1087
ti_csi2rx_probe(struct platform_device * pdev)1088 static int ti_csi2rx_probe(struct platform_device *pdev)
1089 {
1090 struct ti_csi2rx_dev *csi;
1091 int ret;
1092
1093 csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL);
1094 if (!csi)
1095 return -ENOMEM;
1096
1097 csi->dev = &pdev->dev;
1098 platform_set_drvdata(pdev, csi);
1099
1100 mutex_init(&csi->mutex);
1101 csi->shim = devm_platform_ioremap_resource(pdev, 0);
1102 if (IS_ERR(csi->shim)) {
1103 ret = PTR_ERR(csi->shim);
1104 goto err_mutex;
1105 }
1106
1107 ret = ti_csi2rx_init_dma(csi);
1108 if (ret)
1109 goto err_mutex;
1110
1111 ret = ti_csi2rx_v4l2_init(csi);
1112 if (ret)
1113 goto err_dma;
1114
1115 ret = ti_csi2rx_init_vb2q(csi);
1116 if (ret)
1117 goto err_v4l2;
1118
1119 ret = ti_csi2rx_notifier_register(csi);
1120 if (ret)
1121 goto err_vb2q;
1122
1123 ret = of_platform_populate(csi->dev->of_node, NULL, NULL, csi->dev);
1124 if (ret) {
1125 dev_err(csi->dev, "Failed to create children: %d\n", ret);
1126 goto err_subdev;
1127 }
1128
1129 return 0;
1130
1131 err_subdev:
1132 ti_csi2rx_cleanup_subdev(csi);
1133 err_vb2q:
1134 ti_csi2rx_cleanup_vb2q(csi);
1135 err_v4l2:
1136 ti_csi2rx_cleanup_v4l2(csi);
1137 err_dma:
1138 ti_csi2rx_cleanup_dma(csi);
1139 err_mutex:
1140 mutex_destroy(&csi->mutex);
1141 return ret;
1142 }
1143
ti_csi2rx_remove(struct platform_device * pdev)1144 static void ti_csi2rx_remove(struct platform_device *pdev)
1145 {
1146 struct ti_csi2rx_dev *csi = platform_get_drvdata(pdev);
1147
1148 video_unregister_device(&csi->vdev);
1149
1150 ti_csi2rx_cleanup_vb2q(csi);
1151 ti_csi2rx_cleanup_subdev(csi);
1152 ti_csi2rx_cleanup_v4l2(csi);
1153 ti_csi2rx_cleanup_dma(csi);
1154
1155 mutex_destroy(&csi->mutex);
1156 }
1157
1158 static const struct of_device_id ti_csi2rx_of_match[] = {
1159 { .compatible = "ti,j721e-csi2rx-shim", },
1160 { },
1161 };
1162 MODULE_DEVICE_TABLE(of, ti_csi2rx_of_match);
1163
1164 static struct platform_driver ti_csi2rx_pdrv = {
1165 .probe = ti_csi2rx_probe,
1166 .remove_new = ti_csi2rx_remove,
1167 .driver = {
1168 .name = TI_CSI2RX_MODULE_NAME,
1169 .of_match_table = ti_csi2rx_of_match,
1170 },
1171 };
1172
1173 module_platform_driver(ti_csi2rx_pdrv);
1174
1175 MODULE_DESCRIPTION("TI J721E CSI2 RX Driver");
1176 MODULE_AUTHOR("Jai Luthra <j-luthra@ti.com>");
1177 MODULE_LICENSE("GPL");
1178