1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * V4L2 deinterlacing support.
4  *
5  * Copyright (c) 2012 Vista Silicon S.L.
6  * Javier Martin <javier.martin@vista-silicon.com>
7  */
8 
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/interrupt.h>
12 #include <linux/dmaengine.h>
13 #include <linux/platform_device.h>
14 
15 #include <media/v4l2-mem2mem.h>
16 #include <media/v4l2-device.h>
17 #include <media/v4l2-ioctl.h>
18 #include <media/videobuf2-dma-contig.h>
19 
20 #define MEM2MEM_TEST_MODULE_NAME "mem2mem-deinterlace"
21 
22 MODULE_DESCRIPTION("mem2mem device which supports deinterlacing using dmaengine");
23 MODULE_AUTHOR("Javier Martin <javier.martin@vista-silicon.com");
24 MODULE_LICENSE("GPL");
25 MODULE_VERSION("0.0.1");
26 
27 static bool debug;
28 module_param(debug, bool, 0644);
29 
30 /* Flags that indicate a format can be used for capture/output */
31 #define MEM2MEM_CAPTURE	(1 << 0)
32 #define MEM2MEM_OUTPUT	(1 << 1)
33 
34 #define MEM2MEM_NAME		"m2m-deinterlace"
35 
36 #define dprintk(dev, fmt, arg...) \
37 	v4l2_dbg(1, debug, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg)
38 
39 struct deinterlace_fmt {
40 	u32	fourcc;
41 	/* Types the format can be used for */
42 	u32	types;
43 };
44 
45 static struct deinterlace_fmt formats[] = {
46 	{
47 		.fourcc	= V4L2_PIX_FMT_YUV420,
48 		.types	= MEM2MEM_CAPTURE | MEM2MEM_OUTPUT,
49 	},
50 	{
51 		.fourcc	= V4L2_PIX_FMT_YUYV,
52 		.types	= MEM2MEM_CAPTURE | MEM2MEM_OUTPUT,
53 	},
54 };
55 
56 #define NUM_FORMATS ARRAY_SIZE(formats)
57 
58 /* Per-queue, driver-specific private data */
59 struct deinterlace_q_data {
60 	unsigned int		width;
61 	unsigned int		height;
62 	unsigned int		sizeimage;
63 	struct deinterlace_fmt	*fmt;
64 	enum v4l2_field		field;
65 };
66 
67 enum {
68 	V4L2_M2M_SRC = 0,
69 	V4L2_M2M_DST = 1,
70 };
71 
72 enum {
73 	YUV420_DMA_Y_ODD,
74 	YUV420_DMA_Y_EVEN,
75 	YUV420_DMA_U_ODD,
76 	YUV420_DMA_U_EVEN,
77 	YUV420_DMA_V_ODD,
78 	YUV420_DMA_V_EVEN,
79 	YUV420_DMA_Y_ODD_DOUBLING,
80 	YUV420_DMA_U_ODD_DOUBLING,
81 	YUV420_DMA_V_ODD_DOUBLING,
82 	YUYV_DMA_ODD,
83 	YUYV_DMA_EVEN,
84 	YUYV_DMA_EVEN_DOUBLING,
85 };
86 
87 /* Source and destination queue data */
88 static struct deinterlace_q_data q_data[2];
89 
get_q_data(enum v4l2_buf_type type)90 static struct deinterlace_q_data *get_q_data(enum v4l2_buf_type type)
91 {
92 	switch (type) {
93 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
94 		return &q_data[V4L2_M2M_SRC];
95 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
96 		return &q_data[V4L2_M2M_DST];
97 	default:
98 		BUG();
99 	}
100 	return NULL;
101 }
102 
find_format(struct v4l2_format * f)103 static struct deinterlace_fmt *find_format(struct v4l2_format *f)
104 {
105 	struct deinterlace_fmt *fmt;
106 	unsigned int k;
107 
108 	for (k = 0; k < NUM_FORMATS; k++) {
109 		fmt = &formats[k];
110 		if ((fmt->types & f->type) &&
111 			(fmt->fourcc == f->fmt.pix.pixelformat))
112 			break;
113 	}
114 
115 	if (k == NUM_FORMATS)
116 		return NULL;
117 
118 	return &formats[k];
119 }
120 
121 struct deinterlace_dev {
122 	struct v4l2_device	v4l2_dev;
123 	struct video_device	vfd;
124 
125 	atomic_t		busy;
126 	struct mutex		dev_mutex;
127 	spinlock_t		irqlock;
128 
129 	struct dma_chan		*dma_chan;
130 
131 	struct v4l2_m2m_dev	*m2m_dev;
132 };
133 
134 struct deinterlace_ctx {
135 	struct v4l2_fh		fh;
136 	struct deinterlace_dev	*dev;
137 
138 	/* Abort requested by m2m */
139 	int			aborting;
140 	enum v4l2_colorspace	colorspace;
141 	dma_cookie_t		cookie;
142 	struct dma_interleaved_template *xt;
143 };
144 
145 /*
146  * mem2mem callbacks
147  */
deinterlace_job_ready(void * priv)148 static int deinterlace_job_ready(void *priv)
149 {
150 	struct deinterlace_ctx *ctx = priv;
151 	struct deinterlace_dev *pcdev = ctx->dev;
152 
153 	if (v4l2_m2m_num_src_bufs_ready(ctx->fh.m2m_ctx) > 0 &&
154 	    v4l2_m2m_num_dst_bufs_ready(ctx->fh.m2m_ctx) > 0 &&
155 	    !atomic_read(&ctx->dev->busy)) {
156 		dprintk(pcdev, "Task ready\n");
157 		return 1;
158 	}
159 
160 	dprintk(pcdev, "Task not ready to run\n");
161 
162 	return 0;
163 }
164 
deinterlace_job_abort(void * priv)165 static void deinterlace_job_abort(void *priv)
166 {
167 	struct deinterlace_ctx *ctx = priv;
168 	struct deinterlace_dev *pcdev = ctx->dev;
169 
170 	ctx->aborting = 1;
171 
172 	dprintk(pcdev, "Aborting task\n");
173 
174 	v4l2_m2m_job_finish(pcdev->m2m_dev, ctx->fh.m2m_ctx);
175 }
176 
dma_callback(void * data)177 static void dma_callback(void *data)
178 {
179 	struct deinterlace_ctx *curr_ctx = data;
180 	struct deinterlace_dev *pcdev = curr_ctx->dev;
181 	struct vb2_v4l2_buffer *src_vb, *dst_vb;
182 
183 	atomic_set(&pcdev->busy, 0);
184 
185 	src_vb = v4l2_m2m_src_buf_remove(curr_ctx->fh.m2m_ctx);
186 	dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->fh.m2m_ctx);
187 
188 	dst_vb->vb2_buf.timestamp = src_vb->vb2_buf.timestamp;
189 	dst_vb->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
190 	dst_vb->flags |=
191 		src_vb->flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
192 	dst_vb->timecode = src_vb->timecode;
193 
194 	v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_DONE);
195 	v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_DONE);
196 
197 	v4l2_m2m_job_finish(pcdev->m2m_dev, curr_ctx->fh.m2m_ctx);
198 
199 	dprintk(pcdev, "dma transfers completed.\n");
200 }
201 
deinterlace_issue_dma(struct deinterlace_ctx * ctx,int op,int do_callback)202 static void deinterlace_issue_dma(struct deinterlace_ctx *ctx, int op,
203 				  int do_callback)
204 {
205 	struct deinterlace_q_data *s_q_data;
206 	struct vb2_v4l2_buffer *src_buf, *dst_buf;
207 	struct deinterlace_dev *pcdev = ctx->dev;
208 	struct dma_chan *chan = pcdev->dma_chan;
209 	struct dma_device *dmadev = chan->device;
210 	struct dma_async_tx_descriptor *tx;
211 	unsigned int s_width, s_height;
212 	unsigned int s_size;
213 	dma_addr_t p_in, p_out;
214 	enum dma_ctrl_flags flags;
215 
216 	src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
217 	dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
218 
219 	s_q_data = get_q_data(V4L2_BUF_TYPE_VIDEO_OUTPUT);
220 	s_width	= s_q_data->width;
221 	s_height = s_q_data->height;
222 	s_size = s_width * s_height;
223 
224 	p_in = (dma_addr_t)vb2_dma_contig_plane_dma_addr(&src_buf->vb2_buf, 0);
225 	p_out = (dma_addr_t)vb2_dma_contig_plane_dma_addr(&dst_buf->vb2_buf,
226 							  0);
227 	if (!p_in || !p_out) {
228 		v4l2_err(&pcdev->v4l2_dev,
229 			 "Acquiring kernel pointers to buffers failed\n");
230 		return;
231 	}
232 
233 	switch (op) {
234 	case YUV420_DMA_Y_ODD:
235 		ctx->xt->numf = s_height / 2;
236 		ctx->xt->sgl[0].size = s_width;
237 		ctx->xt->sgl[0].icg = s_width;
238 		ctx->xt->src_start = p_in;
239 		ctx->xt->dst_start = p_out;
240 		break;
241 	case YUV420_DMA_Y_EVEN:
242 		ctx->xt->numf = s_height / 2;
243 		ctx->xt->sgl[0].size = s_width;
244 		ctx->xt->sgl[0].icg = s_width;
245 		ctx->xt->src_start = p_in + s_size / 2;
246 		ctx->xt->dst_start = p_out + s_width;
247 		break;
248 	case YUV420_DMA_U_ODD:
249 		ctx->xt->numf = s_height / 4;
250 		ctx->xt->sgl[0].size = s_width / 2;
251 		ctx->xt->sgl[0].icg = s_width / 2;
252 		ctx->xt->src_start = p_in + s_size;
253 		ctx->xt->dst_start = p_out + s_size;
254 		break;
255 	case YUV420_DMA_U_EVEN:
256 		ctx->xt->numf = s_height / 4;
257 		ctx->xt->sgl[0].size = s_width / 2;
258 		ctx->xt->sgl[0].icg = s_width / 2;
259 		ctx->xt->src_start = p_in + (9 * s_size) / 8;
260 		ctx->xt->dst_start = p_out + s_size + s_width / 2;
261 		break;
262 	case YUV420_DMA_V_ODD:
263 		ctx->xt->numf = s_height / 4;
264 		ctx->xt->sgl[0].size = s_width / 2;
265 		ctx->xt->sgl[0].icg = s_width / 2;
266 		ctx->xt->src_start = p_in + (5 * s_size) / 4;
267 		ctx->xt->dst_start = p_out + (5 * s_size) / 4;
268 		break;
269 	case YUV420_DMA_V_EVEN:
270 		ctx->xt->numf = s_height / 4;
271 		ctx->xt->sgl[0].size = s_width / 2;
272 		ctx->xt->sgl[0].icg = s_width / 2;
273 		ctx->xt->src_start = p_in + (11 * s_size) / 8;
274 		ctx->xt->dst_start = p_out + (5 * s_size) / 4 + s_width / 2;
275 		break;
276 	case YUV420_DMA_Y_ODD_DOUBLING:
277 		ctx->xt->numf = s_height / 2;
278 		ctx->xt->sgl[0].size = s_width;
279 		ctx->xt->sgl[0].icg = s_width;
280 		ctx->xt->src_start = p_in;
281 		ctx->xt->dst_start = p_out + s_width;
282 		break;
283 	case YUV420_DMA_U_ODD_DOUBLING:
284 		ctx->xt->numf = s_height / 4;
285 		ctx->xt->sgl[0].size = s_width / 2;
286 		ctx->xt->sgl[0].icg = s_width / 2;
287 		ctx->xt->src_start = p_in + s_size;
288 		ctx->xt->dst_start = p_out + s_size + s_width / 2;
289 		break;
290 	case YUV420_DMA_V_ODD_DOUBLING:
291 		ctx->xt->numf = s_height / 4;
292 		ctx->xt->sgl[0].size = s_width / 2;
293 		ctx->xt->sgl[0].icg = s_width / 2;
294 		ctx->xt->src_start = p_in + (5 * s_size) / 4;
295 		ctx->xt->dst_start = p_out + (5 * s_size) / 4 + s_width / 2;
296 		break;
297 	case YUYV_DMA_ODD:
298 		ctx->xt->numf = s_height / 2;
299 		ctx->xt->sgl[0].size = s_width * 2;
300 		ctx->xt->sgl[0].icg = s_width * 2;
301 		ctx->xt->src_start = p_in;
302 		ctx->xt->dst_start = p_out;
303 		break;
304 	case YUYV_DMA_EVEN:
305 		ctx->xt->numf = s_height / 2;
306 		ctx->xt->sgl[0].size = s_width * 2;
307 		ctx->xt->sgl[0].icg = s_width * 2;
308 		ctx->xt->src_start = p_in + s_size;
309 		ctx->xt->dst_start = p_out + s_width * 2;
310 		break;
311 	case YUYV_DMA_EVEN_DOUBLING:
312 	default:
313 		ctx->xt->numf = s_height / 2;
314 		ctx->xt->sgl[0].size = s_width * 2;
315 		ctx->xt->sgl[0].icg = s_width * 2;
316 		ctx->xt->src_start = p_in;
317 		ctx->xt->dst_start = p_out + s_width * 2;
318 		break;
319 	}
320 
321 	/* Common parameters for al transfers */
322 	ctx->xt->frame_size = 1;
323 	ctx->xt->dir = DMA_MEM_TO_MEM;
324 	ctx->xt->src_sgl = false;
325 	ctx->xt->dst_sgl = true;
326 	flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
327 
328 	tx = dmadev->device_prep_interleaved_dma(chan, ctx->xt, flags);
329 	if (tx == NULL) {
330 		v4l2_warn(&pcdev->v4l2_dev, "DMA interleaved prep error\n");
331 		return;
332 	}
333 
334 	if (do_callback) {
335 		tx->callback = dma_callback;
336 		tx->callback_param = ctx;
337 	}
338 
339 	ctx->cookie = dmaengine_submit(tx);
340 	if (dma_submit_error(ctx->cookie)) {
341 		v4l2_warn(&pcdev->v4l2_dev,
342 			  "DMA submit error %d with src=0x%x dst=0x%x len=0x%x\n",
343 			  ctx->cookie, (unsigned)p_in, (unsigned)p_out,
344 			  s_size * 3/2);
345 		return;
346 	}
347 
348 	dma_async_issue_pending(chan);
349 }
350 
deinterlace_device_run(void * priv)351 static void deinterlace_device_run(void *priv)
352 {
353 	struct deinterlace_ctx *ctx = priv;
354 	struct deinterlace_q_data *dst_q_data;
355 
356 	atomic_set(&ctx->dev->busy, 1);
357 
358 	dprintk(ctx->dev, "%s: DMA try issue.\n", __func__);
359 
360 	dst_q_data = get_q_data(V4L2_BUF_TYPE_VIDEO_CAPTURE);
361 
362 	/*
363 	 * 4 possible field conversions are possible at the moment:
364 	 *  V4L2_FIELD_SEQ_TB --> V4L2_FIELD_INTERLACED_TB:
365 	 *	two separate fields in the same input buffer are interlaced
366 	 *	in the output buffer using weaving. Top field comes first.
367 	 *  V4L2_FIELD_SEQ_TB --> V4L2_FIELD_NONE:
368 	 *	top field from the input buffer is copied to the output buffer
369 	 *	using line doubling. Bottom field from the input buffer is discarded.
370 	 * V4L2_FIELD_SEQ_BT --> V4L2_FIELD_INTERLACED_BT:
371 	 *	two separate fields in the same input buffer are interlaced
372 	 *	in the output buffer using weaving. Bottom field comes first.
373 	 * V4L2_FIELD_SEQ_BT --> V4L2_FIELD_NONE:
374 	 *	bottom field from the input buffer is copied to the output buffer
375 	 *	using line doubling. Top field from the input buffer is discarded.
376 	 */
377 	switch (dst_q_data->fmt->fourcc) {
378 	case V4L2_PIX_FMT_YUV420:
379 		switch (dst_q_data->field) {
380 		case V4L2_FIELD_INTERLACED_TB:
381 		case V4L2_FIELD_INTERLACED_BT:
382 			dprintk(ctx->dev, "%s: yuv420 interlaced tb.\n",
383 				__func__);
384 			deinterlace_issue_dma(ctx, YUV420_DMA_Y_ODD, 0);
385 			deinterlace_issue_dma(ctx, YUV420_DMA_Y_EVEN, 0);
386 			deinterlace_issue_dma(ctx, YUV420_DMA_U_ODD, 0);
387 			deinterlace_issue_dma(ctx, YUV420_DMA_U_EVEN, 0);
388 			deinterlace_issue_dma(ctx, YUV420_DMA_V_ODD, 0);
389 			deinterlace_issue_dma(ctx, YUV420_DMA_V_EVEN, 1);
390 			break;
391 		case V4L2_FIELD_NONE:
392 		default:
393 			dprintk(ctx->dev, "%s: yuv420 interlaced line doubling.\n",
394 				__func__);
395 			deinterlace_issue_dma(ctx, YUV420_DMA_Y_ODD, 0);
396 			deinterlace_issue_dma(ctx, YUV420_DMA_Y_ODD_DOUBLING, 0);
397 			deinterlace_issue_dma(ctx, YUV420_DMA_U_ODD, 0);
398 			deinterlace_issue_dma(ctx, YUV420_DMA_U_ODD_DOUBLING, 0);
399 			deinterlace_issue_dma(ctx, YUV420_DMA_V_ODD, 0);
400 			deinterlace_issue_dma(ctx, YUV420_DMA_V_ODD_DOUBLING, 1);
401 			break;
402 		}
403 		break;
404 	case V4L2_PIX_FMT_YUYV:
405 	default:
406 		switch (dst_q_data->field) {
407 		case V4L2_FIELD_INTERLACED_TB:
408 		case V4L2_FIELD_INTERLACED_BT:
409 			dprintk(ctx->dev, "%s: yuyv interlaced_tb.\n",
410 				__func__);
411 			deinterlace_issue_dma(ctx, YUYV_DMA_ODD, 0);
412 			deinterlace_issue_dma(ctx, YUYV_DMA_EVEN, 1);
413 			break;
414 		case V4L2_FIELD_NONE:
415 		default:
416 			dprintk(ctx->dev, "%s: yuyv interlaced line doubling.\n",
417 				__func__);
418 			deinterlace_issue_dma(ctx, YUYV_DMA_ODD, 0);
419 			deinterlace_issue_dma(ctx, YUYV_DMA_EVEN_DOUBLING, 1);
420 			break;
421 		}
422 		break;
423 	}
424 
425 	dprintk(ctx->dev, "%s: DMA issue done.\n", __func__);
426 }
427 
428 /*
429  * video ioctls
430  */
vidioc_querycap(struct file * file,void * priv,struct v4l2_capability * cap)431 static int vidioc_querycap(struct file *file, void *priv,
432 			   struct v4l2_capability *cap)
433 {
434 	strscpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver));
435 	strscpy(cap->card, MEM2MEM_NAME, sizeof(cap->card));
436 	strscpy(cap->bus_info, MEM2MEM_NAME, sizeof(cap->bus_info));
437 	return 0;
438 }
439 
enum_fmt(struct v4l2_fmtdesc * f,u32 type)440 static int enum_fmt(struct v4l2_fmtdesc *f, u32 type)
441 {
442 	int i, num;
443 	struct deinterlace_fmt *fmt;
444 
445 	num = 0;
446 
447 	for (i = 0; i < NUM_FORMATS; ++i) {
448 		if (formats[i].types & type) {
449 			/* index-th format of type type found ? */
450 			if (num == f->index)
451 				break;
452 			/* Correct type but haven't reached our index yet,
453 			 * just increment per-type index */
454 			++num;
455 		}
456 	}
457 
458 	if (i < NUM_FORMATS) {
459 		/* Format found */
460 		fmt = &formats[i];
461 		f->pixelformat = fmt->fourcc;
462 		return 0;
463 	}
464 
465 	/* Format not found */
466 	return -EINVAL;
467 }
468 
vidioc_enum_fmt_vid_cap(struct file * file,void * priv,struct v4l2_fmtdesc * f)469 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
470 				   struct v4l2_fmtdesc *f)
471 {
472 	return enum_fmt(f, MEM2MEM_CAPTURE);
473 }
474 
vidioc_enum_fmt_vid_out(struct file * file,void * priv,struct v4l2_fmtdesc * f)475 static int vidioc_enum_fmt_vid_out(struct file *file, void *priv,
476 				   struct v4l2_fmtdesc *f)
477 {
478 	return enum_fmt(f, MEM2MEM_OUTPUT);
479 }
480 
vidioc_g_fmt(struct deinterlace_ctx * ctx,struct v4l2_format * f)481 static int vidioc_g_fmt(struct deinterlace_ctx *ctx, struct v4l2_format *f)
482 {
483 	struct vb2_queue *vq;
484 	struct deinterlace_q_data *q_data;
485 
486 	vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
487 	if (!vq)
488 		return -EINVAL;
489 
490 	q_data = get_q_data(f->type);
491 
492 	f->fmt.pix.width	= q_data->width;
493 	f->fmt.pix.height	= q_data->height;
494 	f->fmt.pix.field	= q_data->field;
495 	f->fmt.pix.pixelformat	= q_data->fmt->fourcc;
496 
497 	switch (q_data->fmt->fourcc) {
498 	case V4L2_PIX_FMT_YUV420:
499 		f->fmt.pix.bytesperline = q_data->width * 3 / 2;
500 		break;
501 	case V4L2_PIX_FMT_YUYV:
502 	default:
503 		f->fmt.pix.bytesperline = q_data->width * 2;
504 	}
505 
506 	f->fmt.pix.sizeimage	= q_data->sizeimage;
507 	f->fmt.pix.colorspace	= ctx->colorspace;
508 
509 	return 0;
510 }
511 
vidioc_g_fmt_vid_out(struct file * file,void * priv,struct v4l2_format * f)512 static int vidioc_g_fmt_vid_out(struct file *file, void *priv,
513 				struct v4l2_format *f)
514 {
515 	return vidioc_g_fmt(priv, f);
516 }
517 
vidioc_g_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)518 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
519 				struct v4l2_format *f)
520 {
521 	return vidioc_g_fmt(priv, f);
522 }
523 
vidioc_try_fmt(struct v4l2_format * f,struct deinterlace_fmt * fmt)524 static int vidioc_try_fmt(struct v4l2_format *f, struct deinterlace_fmt *fmt)
525 {
526 	switch (f->fmt.pix.pixelformat) {
527 	case V4L2_PIX_FMT_YUV420:
528 		f->fmt.pix.bytesperline = f->fmt.pix.width * 3 / 2;
529 		break;
530 	case V4L2_PIX_FMT_YUYV:
531 	default:
532 		f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
533 	}
534 	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
535 
536 	return 0;
537 }
538 
vidioc_try_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)539 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
540 				  struct v4l2_format *f)
541 {
542 	struct deinterlace_fmt *fmt;
543 	struct deinterlace_ctx *ctx = priv;
544 
545 	fmt = find_format(f);
546 	if (!fmt || !(fmt->types & MEM2MEM_CAPTURE))
547 		f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUV420;
548 
549 	f->fmt.pix.colorspace = ctx->colorspace;
550 
551 	if (f->fmt.pix.field != V4L2_FIELD_INTERLACED_TB &&
552 	    f->fmt.pix.field != V4L2_FIELD_INTERLACED_BT &&
553 	    f->fmt.pix.field != V4L2_FIELD_NONE)
554 		f->fmt.pix.field = V4L2_FIELD_INTERLACED_TB;
555 
556 	return vidioc_try_fmt(f, fmt);
557 }
558 
vidioc_try_fmt_vid_out(struct file * file,void * priv,struct v4l2_format * f)559 static int vidioc_try_fmt_vid_out(struct file *file, void *priv,
560 				  struct v4l2_format *f)
561 {
562 	struct deinterlace_fmt *fmt;
563 
564 	fmt = find_format(f);
565 	if (!fmt || !(fmt->types & MEM2MEM_OUTPUT))
566 		f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUV420;
567 
568 	if (!f->fmt.pix.colorspace)
569 		f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
570 
571 	if (f->fmt.pix.field != V4L2_FIELD_SEQ_TB &&
572 	    f->fmt.pix.field != V4L2_FIELD_SEQ_BT)
573 		f->fmt.pix.field = V4L2_FIELD_SEQ_TB;
574 
575 	return vidioc_try_fmt(f, fmt);
576 }
577 
vidioc_s_fmt(struct deinterlace_ctx * ctx,struct v4l2_format * f)578 static int vidioc_s_fmt(struct deinterlace_ctx *ctx, struct v4l2_format *f)
579 {
580 	struct deinterlace_q_data *q_data;
581 	struct vb2_queue *vq;
582 
583 	vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
584 	if (!vq)
585 		return -EINVAL;
586 
587 	q_data = get_q_data(f->type);
588 	if (!q_data)
589 		return -EINVAL;
590 
591 	if (vb2_is_busy(vq)) {
592 		v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__);
593 		return -EBUSY;
594 	}
595 
596 	q_data->fmt = find_format(f);
597 	if (!q_data->fmt) {
598 		v4l2_err(&ctx->dev->v4l2_dev,
599 			 "Couldn't set format type %d, wxh: %dx%d. fmt: %d, field: %d\n",
600 			f->type, f->fmt.pix.width, f->fmt.pix.height,
601 			f->fmt.pix.pixelformat, f->fmt.pix.field);
602 		return -EINVAL;
603 	}
604 
605 	q_data->width		= f->fmt.pix.width;
606 	q_data->height		= f->fmt.pix.height;
607 	q_data->field		= f->fmt.pix.field;
608 
609 	switch (f->fmt.pix.pixelformat) {
610 	case V4L2_PIX_FMT_YUV420:
611 		f->fmt.pix.bytesperline = f->fmt.pix.width * 3 / 2;
612 		q_data->sizeimage = (q_data->width * q_data->height * 3) / 2;
613 		break;
614 	case V4L2_PIX_FMT_YUYV:
615 	default:
616 		f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
617 		q_data->sizeimage = q_data->width * q_data->height * 2;
618 	}
619 
620 	dprintk(ctx->dev,
621 		"Setting format for type %d, wxh: %dx%d, fmt: %d, field: %d\n",
622 		f->type, q_data->width, q_data->height, q_data->fmt->fourcc,
623 		q_data->field);
624 
625 	return 0;
626 }
627 
vidioc_s_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)628 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
629 				struct v4l2_format *f)
630 {
631 	int ret;
632 
633 	ret = vidioc_try_fmt_vid_cap(file, priv, f);
634 	if (ret)
635 		return ret;
636 	return vidioc_s_fmt(priv, f);
637 }
638 
vidioc_s_fmt_vid_out(struct file * file,void * priv,struct v4l2_format * f)639 static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
640 				struct v4l2_format *f)
641 {
642 	struct deinterlace_ctx *ctx = priv;
643 	int ret;
644 
645 	ret = vidioc_try_fmt_vid_out(file, priv, f);
646 	if (ret)
647 		return ret;
648 
649 	ret = vidioc_s_fmt(priv, f);
650 	if (!ret)
651 		ctx->colorspace = f->fmt.pix.colorspace;
652 
653 	return ret;
654 }
655 
vidioc_streamon(struct file * file,void * priv,enum v4l2_buf_type type)656 static int vidioc_streamon(struct file *file, void *priv,
657 			   enum v4l2_buf_type type)
658 {
659 	struct deinterlace_q_data *s_q_data, *d_q_data;
660 	struct deinterlace_ctx *ctx = priv;
661 
662 	s_q_data = get_q_data(V4L2_BUF_TYPE_VIDEO_OUTPUT);
663 	d_q_data = get_q_data(V4L2_BUF_TYPE_VIDEO_CAPTURE);
664 
665 	/* Check that src and dst queues have the same pix format */
666 	if (s_q_data->fmt->fourcc != d_q_data->fmt->fourcc) {
667 		v4l2_err(&ctx->dev->v4l2_dev,
668 			 "src and dst formats don't match.\n");
669 		return -EINVAL;
670 	}
671 
672 	/* Check that input and output deinterlacing types are compatible */
673 	switch (s_q_data->field) {
674 	case V4L2_FIELD_SEQ_BT:
675 		if (d_q_data->field != V4L2_FIELD_NONE &&
676 			d_q_data->field != V4L2_FIELD_INTERLACED_BT) {
677 			v4l2_err(&ctx->dev->v4l2_dev,
678 			 "src and dst field conversion [(%d)->(%d)] not supported.\n",
679 				s_q_data->field, d_q_data->field);
680 			return -EINVAL;
681 		}
682 		break;
683 	case V4L2_FIELD_SEQ_TB:
684 		if (d_q_data->field != V4L2_FIELD_NONE &&
685 			d_q_data->field != V4L2_FIELD_INTERLACED_TB) {
686 			v4l2_err(&ctx->dev->v4l2_dev,
687 			 "src and dst field conversion [(%d)->(%d)] not supported.\n",
688 				s_q_data->field, d_q_data->field);
689 			return -EINVAL;
690 		}
691 		break;
692 	default:
693 		return -EINVAL;
694 	}
695 
696 	return v4l2_m2m_streamon(file, ctx->fh.m2m_ctx, type);
697 }
698 
699 static const struct v4l2_ioctl_ops deinterlace_ioctl_ops = {
700 	.vidioc_querycap	= vidioc_querycap,
701 
702 	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
703 	.vidioc_g_fmt_vid_cap	= vidioc_g_fmt_vid_cap,
704 	.vidioc_try_fmt_vid_cap	= vidioc_try_fmt_vid_cap,
705 	.vidioc_s_fmt_vid_cap	= vidioc_s_fmt_vid_cap,
706 
707 	.vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out,
708 	.vidioc_g_fmt_vid_out	= vidioc_g_fmt_vid_out,
709 	.vidioc_try_fmt_vid_out	= vidioc_try_fmt_vid_out,
710 	.vidioc_s_fmt_vid_out	= vidioc_s_fmt_vid_out,
711 
712 	.vidioc_reqbufs		= v4l2_m2m_ioctl_reqbufs,
713 	.vidioc_querybuf	= v4l2_m2m_ioctl_querybuf,
714 	.vidioc_qbuf		= v4l2_m2m_ioctl_qbuf,
715 	.vidioc_dqbuf		= v4l2_m2m_ioctl_dqbuf,
716 	.vidioc_prepare_buf	= v4l2_m2m_ioctl_prepare_buf,
717 	.vidioc_expbuf		= v4l2_m2m_ioctl_expbuf,
718 
719 	.vidioc_streamon	= vidioc_streamon,
720 	.vidioc_streamoff	= v4l2_m2m_ioctl_streamoff,
721 };
722 
723 
724 /*
725  * Queue operations
726  */
727 struct vb2_dc_conf {
728 	struct device           *dev;
729 };
730 
deinterlace_queue_setup(struct vb2_queue * vq,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],struct device * alloc_devs[])731 static int deinterlace_queue_setup(struct vb2_queue *vq,
732 				unsigned int *nbuffers, unsigned int *nplanes,
733 				unsigned int sizes[], struct device *alloc_devs[])
734 {
735 	struct deinterlace_ctx *ctx = vb2_get_drv_priv(vq);
736 	struct deinterlace_q_data *q_data;
737 	unsigned int size, count = *nbuffers;
738 
739 	q_data = get_q_data(vq->type);
740 
741 	switch (q_data->fmt->fourcc) {
742 	case V4L2_PIX_FMT_YUV420:
743 		size = q_data->width * q_data->height * 3 / 2;
744 		break;
745 	case V4L2_PIX_FMT_YUYV:
746 	default:
747 		size = q_data->width * q_data->height * 2;
748 	}
749 
750 	*nplanes = 1;
751 	*nbuffers = count;
752 	sizes[0] = size;
753 
754 	dprintk(ctx->dev, "get %d buffer(s) of size %d each.\n", count, size);
755 
756 	return 0;
757 }
758 
deinterlace_buf_prepare(struct vb2_buffer * vb)759 static int deinterlace_buf_prepare(struct vb2_buffer *vb)
760 {
761 	struct deinterlace_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
762 	struct deinterlace_q_data *q_data;
763 
764 	dprintk(ctx->dev, "type: %d\n", vb->vb2_queue->type);
765 
766 	q_data = get_q_data(vb->vb2_queue->type);
767 
768 	if (vb2_plane_size(vb, 0) < q_data->sizeimage) {
769 		dprintk(ctx->dev, "%s data will not fit into plane (%lu < %lu)\n",
770 			__func__, vb2_plane_size(vb, 0), (long)q_data->sizeimage);
771 		return -EINVAL;
772 	}
773 
774 	vb2_set_plane_payload(vb, 0, q_data->sizeimage);
775 
776 	return 0;
777 }
778 
deinterlace_buf_queue(struct vb2_buffer * vb)779 static void deinterlace_buf_queue(struct vb2_buffer *vb)
780 {
781 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
782 	struct deinterlace_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
783 
784 	v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
785 }
786 
787 static const struct vb2_ops deinterlace_qops = {
788 	.queue_setup	 = deinterlace_queue_setup,
789 	.buf_prepare	 = deinterlace_buf_prepare,
790 	.buf_queue	 = deinterlace_buf_queue,
791 	.wait_prepare	 = vb2_ops_wait_prepare,
792 	.wait_finish	 = vb2_ops_wait_finish,
793 };
794 
queue_init(void * priv,struct vb2_queue * src_vq,struct vb2_queue * dst_vq)795 static int queue_init(void *priv, struct vb2_queue *src_vq,
796 		      struct vb2_queue *dst_vq)
797 {
798 	struct deinterlace_ctx *ctx = priv;
799 	int ret;
800 
801 	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
802 	src_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
803 	src_vq->drv_priv = ctx;
804 	src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
805 	src_vq->ops = &deinterlace_qops;
806 	src_vq->mem_ops = &vb2_dma_contig_memops;
807 	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
808 	src_vq->dev = ctx->dev->v4l2_dev.dev;
809 	src_vq->lock = &ctx->dev->dev_mutex;
810 	q_data[V4L2_M2M_SRC].fmt = &formats[0];
811 	q_data[V4L2_M2M_SRC].width = 640;
812 	q_data[V4L2_M2M_SRC].height = 480;
813 	q_data[V4L2_M2M_SRC].sizeimage = (640 * 480 * 3) / 2;
814 	q_data[V4L2_M2M_SRC].field = V4L2_FIELD_SEQ_TB;
815 
816 	ret = vb2_queue_init(src_vq);
817 	if (ret)
818 		return ret;
819 
820 	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
821 	dst_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
822 	dst_vq->drv_priv = ctx;
823 	dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
824 	dst_vq->ops = &deinterlace_qops;
825 	dst_vq->mem_ops = &vb2_dma_contig_memops;
826 	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
827 	dst_vq->dev = ctx->dev->v4l2_dev.dev;
828 	dst_vq->lock = &ctx->dev->dev_mutex;
829 	q_data[V4L2_M2M_DST].fmt = &formats[0];
830 	q_data[V4L2_M2M_DST].width = 640;
831 	q_data[V4L2_M2M_DST].height = 480;
832 	q_data[V4L2_M2M_DST].sizeimage = (640 * 480 * 3) / 2;
833 	q_data[V4L2_M2M_SRC].field = V4L2_FIELD_INTERLACED_TB;
834 
835 	return vb2_queue_init(dst_vq);
836 }
837 
838 /*
839  * File operations
840  */
deinterlace_open(struct file * file)841 static int deinterlace_open(struct file *file)
842 {
843 	struct deinterlace_dev *pcdev = video_drvdata(file);
844 	struct deinterlace_ctx *ctx = NULL;
845 
846 	ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
847 	if (!ctx)
848 		return -ENOMEM;
849 
850 	v4l2_fh_init(&ctx->fh, video_devdata(file));
851 	file->private_data = &ctx->fh;
852 	ctx->dev = pcdev;
853 
854 	ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(pcdev->m2m_dev, ctx, &queue_init);
855 	if (IS_ERR(ctx->fh.m2m_ctx)) {
856 		int ret = PTR_ERR(ctx->fh.m2m_ctx);
857 
858 		kfree(ctx);
859 		return ret;
860 	}
861 
862 	ctx->xt = kzalloc(sizeof(struct dma_interleaved_template) +
863 				sizeof(struct data_chunk), GFP_KERNEL);
864 	if (!ctx->xt) {
865 		kfree(ctx);
866 		return -ENOMEM;
867 	}
868 
869 	ctx->colorspace = V4L2_COLORSPACE_REC709;
870 	v4l2_fh_add(&ctx->fh);
871 
872 	dprintk(pcdev, "Created instance %p, m2m_ctx: %p\n",
873 		ctx, ctx->fh.m2m_ctx);
874 
875 	return 0;
876 }
877 
deinterlace_release(struct file * file)878 static int deinterlace_release(struct file *file)
879 {
880 	struct deinterlace_dev *pcdev = video_drvdata(file);
881 	struct deinterlace_ctx *ctx = file->private_data;
882 
883 	dprintk(pcdev, "Releasing instance %p\n", ctx);
884 
885 	v4l2_fh_del(&ctx->fh);
886 	v4l2_fh_exit(&ctx->fh);
887 	v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
888 	kfree(ctx->xt);
889 	kfree(ctx);
890 
891 	return 0;
892 }
893 
894 static const struct v4l2_file_operations deinterlace_fops = {
895 	.owner		= THIS_MODULE,
896 	.open		= deinterlace_open,
897 	.release	= deinterlace_release,
898 	.poll		= v4l2_m2m_fop_poll,
899 	.unlocked_ioctl	= video_ioctl2,
900 	.mmap		= v4l2_m2m_fop_mmap,
901 };
902 
903 static const struct video_device deinterlace_videodev = {
904 	.name		= MEM2MEM_NAME,
905 	.fops		= &deinterlace_fops,
906 	.ioctl_ops	= &deinterlace_ioctl_ops,
907 	.minor		= -1,
908 	.release	= video_device_release_empty,
909 	.vfl_dir	= VFL_DIR_M2M,
910 	.device_caps	= V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING,
911 };
912 
913 static const struct v4l2_m2m_ops m2m_ops = {
914 	.device_run	= deinterlace_device_run,
915 	.job_ready	= deinterlace_job_ready,
916 	.job_abort	= deinterlace_job_abort,
917 };
918 
deinterlace_probe(struct platform_device * pdev)919 static int deinterlace_probe(struct platform_device *pdev)
920 {
921 	struct deinterlace_dev *pcdev;
922 	struct video_device *vfd;
923 	dma_cap_mask_t mask;
924 	int ret = 0;
925 
926 	pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
927 	if (!pcdev)
928 		return -ENOMEM;
929 
930 	spin_lock_init(&pcdev->irqlock);
931 
932 	dma_cap_zero(mask);
933 	dma_cap_set(DMA_INTERLEAVE, mask);
934 	pcdev->dma_chan = dma_request_channel(mask, NULL, pcdev);
935 	if (!pcdev->dma_chan)
936 		return -ENODEV;
937 
938 	if (!dma_has_cap(DMA_INTERLEAVE, pcdev->dma_chan->device->cap_mask)) {
939 		dev_err(&pdev->dev, "DMA does not support INTERLEAVE\n");
940 		ret = -ENODEV;
941 		goto rel_dma;
942 	}
943 
944 	ret = v4l2_device_register(&pdev->dev, &pcdev->v4l2_dev);
945 	if (ret)
946 		goto rel_dma;
947 
948 	atomic_set(&pcdev->busy, 0);
949 	mutex_init(&pcdev->dev_mutex);
950 
951 	vfd = &pcdev->vfd;
952 	*vfd = deinterlace_videodev;
953 	vfd->lock = &pcdev->dev_mutex;
954 	vfd->v4l2_dev = &pcdev->v4l2_dev;
955 
956 	ret = video_register_device(vfd, VFL_TYPE_VIDEO, 0);
957 	if (ret) {
958 		v4l2_err(&pcdev->v4l2_dev, "Failed to register video device\n");
959 		goto unreg_dev;
960 	}
961 
962 	video_set_drvdata(vfd, pcdev);
963 	v4l2_info(&pcdev->v4l2_dev, MEM2MEM_TEST_MODULE_NAME
964 			" Device registered as /dev/video%d\n", vfd->num);
965 
966 	platform_set_drvdata(pdev, pcdev);
967 
968 	pcdev->m2m_dev = v4l2_m2m_init(&m2m_ops);
969 	if (IS_ERR(pcdev->m2m_dev)) {
970 		v4l2_err(&pcdev->v4l2_dev, "Failed to init mem2mem device\n");
971 		ret = PTR_ERR(pcdev->m2m_dev);
972 		goto err_m2m;
973 	}
974 
975 	return 0;
976 
977 err_m2m:
978 	video_unregister_device(&pcdev->vfd);
979 unreg_dev:
980 	v4l2_device_unregister(&pcdev->v4l2_dev);
981 rel_dma:
982 	dma_release_channel(pcdev->dma_chan);
983 
984 	return ret;
985 }
986 
deinterlace_remove(struct platform_device * pdev)987 static void deinterlace_remove(struct platform_device *pdev)
988 {
989 	struct deinterlace_dev *pcdev = platform_get_drvdata(pdev);
990 
991 	v4l2_info(&pcdev->v4l2_dev, "Removing " MEM2MEM_TEST_MODULE_NAME);
992 	v4l2_m2m_release(pcdev->m2m_dev);
993 	video_unregister_device(&pcdev->vfd);
994 	v4l2_device_unregister(&pcdev->v4l2_dev);
995 	dma_release_channel(pcdev->dma_chan);
996 }
997 
998 static struct platform_driver deinterlace_pdrv = {
999 	.probe		= deinterlace_probe,
1000 	.remove_new	= deinterlace_remove,
1001 	.driver		= {
1002 		.name	= MEM2MEM_NAME,
1003 	},
1004 };
1005 module_platform_driver(deinterlace_pdrv);
1006 
1007