1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * ispvideo.c
4  *
5  * TI OMAP3 ISP - Generic video node
6  *
7  * Copyright (C) 2009-2010 Nokia Corporation
8  *
9  * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
10  *	     Sakari Ailus <sakari.ailus@iki.fi>
11  */
12 
13 #include <linux/clk.h>
14 #include <linux/mm.h>
15 #include <linux/module.h>
16 #include <linux/pagemap.h>
17 #include <linux/scatterlist.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.h>
21 
22 #include <media/v4l2-dev.h>
23 #include <media/v4l2-ioctl.h>
24 #include <media/v4l2-mc.h>
25 #include <media/videobuf2-dma-contig.h>
26 
27 #include "ispvideo.h"
28 #include "isp.h"
29 
30 
31 /* -----------------------------------------------------------------------------
32  * Helper functions
33  */
34 
35 /*
36  * NOTE: When adding new media bus codes, always remember to add
37  * corresponding in-memory formats to the table below!!!
38  */
39 static struct isp_format_info formats[] = {
40 	{ MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
41 	  MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
42 	  V4L2_PIX_FMT_GREY, 8, 1, },
43 	{ MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y10_1X10,
44 	  MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y8_1X8,
45 	  V4L2_PIX_FMT_Y10, 10, 2, },
46 	{ MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y10_1X10,
47 	  MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y8_1X8,
48 	  V4L2_PIX_FMT_Y12, 12, 2, },
49 	{ MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
50 	  MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
51 	  V4L2_PIX_FMT_SBGGR8, 8, 1, },
52 	{ MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
53 	  MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
54 	  V4L2_PIX_FMT_SGBRG8, 8, 1, },
55 	{ MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
56 	  MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
57 	  V4L2_PIX_FMT_SGRBG8, 8, 1, },
58 	{ MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
59 	  MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
60 	  V4L2_PIX_FMT_SRGGB8, 8, 1, },
61 	{ MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8, MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8,
62 	  MEDIA_BUS_FMT_SBGGR10_1X10, 0,
63 	  V4L2_PIX_FMT_SBGGR10DPCM8, 8, 1, },
64 	{ MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8, MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8,
65 	  MEDIA_BUS_FMT_SGBRG10_1X10, 0,
66 	  V4L2_PIX_FMT_SGBRG10DPCM8, 8, 1, },
67 	{ MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
68 	  MEDIA_BUS_FMT_SGRBG10_1X10, 0,
69 	  V4L2_PIX_FMT_SGRBG10DPCM8, 8, 1, },
70 	{ MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8, MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8,
71 	  MEDIA_BUS_FMT_SRGGB10_1X10, 0,
72 	  V4L2_PIX_FMT_SRGGB10DPCM8, 8, 1, },
73 	{ MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10,
74 	  MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR8_1X8,
75 	  V4L2_PIX_FMT_SBGGR10, 10, 2, },
76 	{ MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG10_1X10,
77 	  MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG8_1X8,
78 	  V4L2_PIX_FMT_SGBRG10, 10, 2, },
79 	{ MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10,
80 	  MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG8_1X8,
81 	  V4L2_PIX_FMT_SGRBG10, 10, 2, },
82 	{ MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB10_1X10,
83 	  MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB8_1X8,
84 	  V4L2_PIX_FMT_SRGGB10, 10, 2, },
85 	{ MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR10_1X10,
86 	  MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR8_1X8,
87 	  V4L2_PIX_FMT_SBGGR12, 12, 2, },
88 	{ MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG10_1X10,
89 	  MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG8_1X8,
90 	  V4L2_PIX_FMT_SGBRG12, 12, 2, },
91 	{ MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG10_1X10,
92 	  MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG8_1X8,
93 	  V4L2_PIX_FMT_SGRBG12, 12, 2, },
94 	{ MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB10_1X10,
95 	  MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB8_1X8,
96 	  V4L2_PIX_FMT_SRGGB12, 12, 2, },
97 	{ MEDIA_BUS_FMT_UYVY8_1X16, MEDIA_BUS_FMT_UYVY8_1X16,
98 	  MEDIA_BUS_FMT_UYVY8_1X16, 0,
99 	  V4L2_PIX_FMT_UYVY, 16, 2, },
100 	{ MEDIA_BUS_FMT_YUYV8_1X16, MEDIA_BUS_FMT_YUYV8_1X16,
101 	  MEDIA_BUS_FMT_YUYV8_1X16, 0,
102 	  V4L2_PIX_FMT_YUYV, 16, 2, },
103 	{ MEDIA_BUS_FMT_UYVY8_2X8, MEDIA_BUS_FMT_UYVY8_2X8,
104 	  MEDIA_BUS_FMT_UYVY8_2X8, 0,
105 	  V4L2_PIX_FMT_UYVY, 8, 2, },
106 	{ MEDIA_BUS_FMT_YUYV8_2X8, MEDIA_BUS_FMT_YUYV8_2X8,
107 	  MEDIA_BUS_FMT_YUYV8_2X8, 0,
108 	  V4L2_PIX_FMT_YUYV, 8, 2, },
109 	/* Empty entry to catch the unsupported pixel code (0) used by the CCDC
110 	 * module and avoid NULL pointer dereferences.
111 	 */
112 	{ 0, }
113 };
114 
omap3isp_video_format_info(u32 code)115 const struct isp_format_info *omap3isp_video_format_info(u32 code)
116 {
117 	unsigned int i;
118 
119 	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
120 		if (formats[i].code == code)
121 			return &formats[i];
122 	}
123 
124 	return NULL;
125 }
126 
127 /*
128  * isp_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
129  * @video: ISP video instance
130  * @mbus: v4l2_mbus_framefmt format (input)
131  * @pix: v4l2_pix_format format (output)
132  *
133  * Fill the output pix structure with information from the input mbus format.
134  * The bytesperline and sizeimage fields are computed from the requested bytes
135  * per line value in the pix format and information from the video instance.
136  *
137  * Return the number of padding bytes at end of line.
138  */
isp_video_mbus_to_pix(const struct isp_video * video,const struct v4l2_mbus_framefmt * mbus,struct v4l2_pix_format * pix)139 static unsigned int isp_video_mbus_to_pix(const struct isp_video *video,
140 					  const struct v4l2_mbus_framefmt *mbus,
141 					  struct v4l2_pix_format *pix)
142 {
143 	unsigned int bpl = pix->bytesperline;
144 	unsigned int min_bpl;
145 	unsigned int i;
146 
147 	memset(pix, 0, sizeof(*pix));
148 	pix->width = mbus->width;
149 	pix->height = mbus->height;
150 
151 	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
152 		if (formats[i].code == mbus->code)
153 			break;
154 	}
155 
156 	if (WARN_ON(i == ARRAY_SIZE(formats)))
157 		return 0;
158 
159 	min_bpl = pix->width * formats[i].bpp;
160 
161 	/* Clamp the requested bytes per line value. If the maximum bytes per
162 	 * line value is zero, the module doesn't support user configurable line
163 	 * sizes. Override the requested value with the minimum in that case.
164 	 */
165 	if (video->bpl_max)
166 		bpl = clamp(bpl, min_bpl, video->bpl_max);
167 	else
168 		bpl = min_bpl;
169 
170 	if (!video->bpl_zero_padding || bpl != min_bpl)
171 		bpl = ALIGN(bpl, video->bpl_alignment);
172 
173 	pix->pixelformat = formats[i].pixelformat;
174 	pix->bytesperline = bpl;
175 	pix->sizeimage = pix->bytesperline * pix->height;
176 	pix->colorspace = mbus->colorspace;
177 	pix->field = mbus->field;
178 
179 	return bpl - min_bpl;
180 }
181 
isp_video_pix_to_mbus(const struct v4l2_pix_format * pix,struct v4l2_mbus_framefmt * mbus)182 static void isp_video_pix_to_mbus(const struct v4l2_pix_format *pix,
183 				  struct v4l2_mbus_framefmt *mbus)
184 {
185 	unsigned int i;
186 
187 	memset(mbus, 0, sizeof(*mbus));
188 	mbus->width = pix->width;
189 	mbus->height = pix->height;
190 
191 	/* Skip the last format in the loop so that it will be selected if no
192 	 * match is found.
193 	 */
194 	for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
195 		if (formats[i].pixelformat == pix->pixelformat)
196 			break;
197 	}
198 
199 	mbus->code = formats[i].code;
200 	mbus->colorspace = pix->colorspace;
201 	mbus->field = pix->field;
202 }
203 
204 static struct v4l2_subdev *
isp_video_remote_subdev(struct isp_video * video,u32 * pad)205 isp_video_remote_subdev(struct isp_video *video, u32 *pad)
206 {
207 	struct media_pad *remote;
208 
209 	remote = media_pad_remote_pad_first(&video->pad);
210 
211 	if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
212 		return NULL;
213 
214 	if (pad)
215 		*pad = remote->index;
216 
217 	return media_entity_to_v4l2_subdev(remote->entity);
218 }
219 
220 /* Return a pointer to the ISP video instance at the far end of the pipeline. */
isp_video_get_graph_data(struct isp_video * video,struct isp_pipeline * pipe)221 static int isp_video_get_graph_data(struct isp_video *video,
222 				    struct isp_pipeline *pipe)
223 {
224 	struct media_graph graph;
225 	struct media_entity *entity = &video->video.entity;
226 	struct media_device *mdev = entity->graph_obj.mdev;
227 	struct isp_video *far_end = NULL;
228 	int ret;
229 
230 	mutex_lock(&mdev->graph_mutex);
231 	ret = media_graph_walk_init(&graph, mdev);
232 	if (ret) {
233 		mutex_unlock(&mdev->graph_mutex);
234 		return ret;
235 	}
236 
237 	media_graph_walk_start(&graph, entity);
238 
239 	while ((entity = media_graph_walk_next(&graph))) {
240 		struct isp_video *__video;
241 
242 		media_entity_enum_set(&pipe->ent_enum, entity);
243 
244 		if (far_end != NULL)
245 			continue;
246 
247 		if (entity == &video->video.entity)
248 			continue;
249 
250 		if (!is_media_entity_v4l2_video_device(entity))
251 			continue;
252 
253 		__video = to_isp_video(media_entity_to_video_device(entity));
254 		if (__video->type != video->type)
255 			far_end = __video;
256 	}
257 
258 	mutex_unlock(&mdev->graph_mutex);
259 
260 	media_graph_walk_cleanup(&graph);
261 
262 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
263 		pipe->input = far_end;
264 		pipe->output = video;
265 	} else {
266 		if (far_end == NULL)
267 			return -EPIPE;
268 
269 		pipe->input = video;
270 		pipe->output = far_end;
271 	}
272 
273 	return 0;
274 }
275 
276 static int
__isp_video_get_format(struct isp_video * video,struct v4l2_format * format)277 __isp_video_get_format(struct isp_video *video, struct v4l2_format *format)
278 {
279 	struct v4l2_subdev_format fmt;
280 	struct v4l2_subdev *subdev;
281 	u32 pad;
282 	int ret;
283 
284 	subdev = isp_video_remote_subdev(video, &pad);
285 	if (subdev == NULL)
286 		return -EINVAL;
287 
288 	fmt.pad = pad;
289 	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
290 
291 	mutex_lock(&video->mutex);
292 	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
293 	mutex_unlock(&video->mutex);
294 
295 	if (ret)
296 		return ret;
297 
298 	format->type = video->type;
299 	return isp_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
300 }
301 
302 static int
isp_video_check_format(struct isp_video * video,struct isp_video_fh * vfh)303 isp_video_check_format(struct isp_video *video, struct isp_video_fh *vfh)
304 {
305 	struct v4l2_format format;
306 	int ret;
307 
308 	memcpy(&format, &vfh->format, sizeof(format));
309 	ret = __isp_video_get_format(video, &format);
310 	if (ret < 0)
311 		return ret;
312 
313 	if (vfh->format.fmt.pix.pixelformat != format.fmt.pix.pixelformat ||
314 	    vfh->format.fmt.pix.height != format.fmt.pix.height ||
315 	    vfh->format.fmt.pix.width != format.fmt.pix.width ||
316 	    vfh->format.fmt.pix.bytesperline != format.fmt.pix.bytesperline ||
317 	    vfh->format.fmt.pix.sizeimage != format.fmt.pix.sizeimage ||
318 	    vfh->format.fmt.pix.field != format.fmt.pix.field)
319 		return -EINVAL;
320 
321 	return 0;
322 }
323 
324 /* -----------------------------------------------------------------------------
325  * Video queue operations
326  */
327 
isp_video_queue_setup(struct vb2_queue * queue,unsigned int * count,unsigned int * num_planes,unsigned int sizes[],struct device * alloc_devs[])328 static int isp_video_queue_setup(struct vb2_queue *queue,
329 				 unsigned int *count, unsigned int *num_planes,
330 				 unsigned int sizes[], struct device *alloc_devs[])
331 {
332 	struct isp_video_fh *vfh = vb2_get_drv_priv(queue);
333 	struct isp_video *video = vfh->video;
334 
335 	*num_planes = 1;
336 
337 	sizes[0] = vfh->format.fmt.pix.sizeimage;
338 	if (sizes[0] == 0)
339 		return -EINVAL;
340 
341 	*count = min(*count, video->capture_mem / PAGE_ALIGN(sizes[0]));
342 
343 	return 0;
344 }
345 
isp_video_buffer_prepare(struct vb2_buffer * buf)346 static int isp_video_buffer_prepare(struct vb2_buffer *buf)
347 {
348 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(buf);
349 	struct isp_video_fh *vfh = vb2_get_drv_priv(buf->vb2_queue);
350 	struct isp_buffer *buffer = to_isp_buffer(vbuf);
351 	struct isp_video *video = vfh->video;
352 	dma_addr_t addr;
353 
354 	/* Refuse to prepare the buffer is the video node has registered an
355 	 * error. We don't need to take any lock here as the operation is
356 	 * inherently racy. The authoritative check will be performed in the
357 	 * queue handler, which can't return an error, this check is just a best
358 	 * effort to notify userspace as early as possible.
359 	 */
360 	if (unlikely(video->error))
361 		return -EIO;
362 
363 	addr = vb2_dma_contig_plane_dma_addr(buf, 0);
364 	if (!IS_ALIGNED(addr, 32)) {
365 		dev_dbg(video->isp->dev,
366 			"Buffer address must be aligned to 32 bytes boundary.\n");
367 		return -EINVAL;
368 	}
369 
370 	vb2_set_plane_payload(&buffer->vb.vb2_buf, 0,
371 			      vfh->format.fmt.pix.sizeimage);
372 	buffer->dma = addr;
373 
374 	return 0;
375 }
376 
377 /*
378  * isp_video_buffer_queue - Add buffer to streaming queue
379  * @buf: Video buffer
380  *
381  * In memory-to-memory mode, start streaming on the pipeline if buffers are
382  * queued on both the input and the output, if the pipeline isn't already busy.
383  * If the pipeline is busy, it will be restarted in the output module interrupt
384  * handler.
385  */
isp_video_buffer_queue(struct vb2_buffer * buf)386 static void isp_video_buffer_queue(struct vb2_buffer *buf)
387 {
388 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(buf);
389 	struct isp_video_fh *vfh = vb2_get_drv_priv(buf->vb2_queue);
390 	struct isp_buffer *buffer = to_isp_buffer(vbuf);
391 	struct isp_video *video = vfh->video;
392 	struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
393 	enum isp_pipeline_state state;
394 	unsigned long flags;
395 	unsigned int empty;
396 	unsigned int start;
397 
398 	spin_lock_irqsave(&video->irqlock, flags);
399 
400 	if (unlikely(video->error)) {
401 		vb2_buffer_done(&buffer->vb.vb2_buf, VB2_BUF_STATE_ERROR);
402 		spin_unlock_irqrestore(&video->irqlock, flags);
403 		return;
404 	}
405 
406 	empty = list_empty(&video->dmaqueue);
407 	list_add_tail(&buffer->irqlist, &video->dmaqueue);
408 
409 	spin_unlock_irqrestore(&video->irqlock, flags);
410 
411 	if (empty) {
412 		if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
413 			state = ISP_PIPELINE_QUEUE_OUTPUT;
414 		else
415 			state = ISP_PIPELINE_QUEUE_INPUT;
416 
417 		spin_lock_irqsave(&pipe->lock, flags);
418 		pipe->state |= state;
419 		video->ops->queue(video, buffer);
420 		video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_QUEUED;
421 
422 		start = isp_pipeline_ready(pipe);
423 		if (start)
424 			pipe->state |= ISP_PIPELINE_STREAM;
425 		spin_unlock_irqrestore(&pipe->lock, flags);
426 
427 		if (start)
428 			omap3isp_pipeline_set_stream(pipe,
429 						ISP_PIPELINE_STREAM_SINGLESHOT);
430 	}
431 }
432 
433 /*
434  * omap3isp_video_return_buffers - Return all queued buffers to videobuf2
435  * @video: ISP video object
436  * @state: new state for the returned buffers
437  *
438  * Return all buffers queued on the video node to videobuf2 in the given state.
439  * The buffer state should be VB2_BUF_STATE_QUEUED if called due to an error
440  * when starting the stream, or VB2_BUF_STATE_ERROR otherwise.
441  *
442  * The function must be called with the video irqlock held.
443  */
omap3isp_video_return_buffers(struct isp_video * video,enum vb2_buffer_state state)444 static void omap3isp_video_return_buffers(struct isp_video *video,
445 					  enum vb2_buffer_state state)
446 {
447 	while (!list_empty(&video->dmaqueue)) {
448 		struct isp_buffer *buf;
449 
450 		buf = list_first_entry(&video->dmaqueue,
451 				       struct isp_buffer, irqlist);
452 		list_del(&buf->irqlist);
453 		vb2_buffer_done(&buf->vb.vb2_buf, state);
454 	}
455 }
456 
isp_video_start_streaming(struct vb2_queue * queue,unsigned int count)457 static int isp_video_start_streaming(struct vb2_queue *queue,
458 				     unsigned int count)
459 {
460 	struct isp_video_fh *vfh = vb2_get_drv_priv(queue);
461 	struct isp_video *video = vfh->video;
462 	struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
463 	unsigned long flags;
464 	int ret;
465 
466 	/* In sensor-to-memory mode, the stream can be started synchronously
467 	 * to the stream on command. In memory-to-memory mode, it will be
468 	 * started when buffers are queued on both the input and output.
469 	 */
470 	if (pipe->input)
471 		return 0;
472 
473 	ret = omap3isp_pipeline_set_stream(pipe,
474 					   ISP_PIPELINE_STREAM_CONTINUOUS);
475 	if (ret < 0) {
476 		spin_lock_irqsave(&video->irqlock, flags);
477 		omap3isp_video_return_buffers(video, VB2_BUF_STATE_QUEUED);
478 		spin_unlock_irqrestore(&video->irqlock, flags);
479 		return ret;
480 	}
481 
482 	spin_lock_irqsave(&video->irqlock, flags);
483 	if (list_empty(&video->dmaqueue))
484 		video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
485 	spin_unlock_irqrestore(&video->irqlock, flags);
486 
487 	return 0;
488 }
489 
490 static const struct vb2_ops isp_video_queue_ops = {
491 	.queue_setup = isp_video_queue_setup,
492 	.buf_prepare = isp_video_buffer_prepare,
493 	.buf_queue = isp_video_buffer_queue,
494 	.start_streaming = isp_video_start_streaming,
495 };
496 
497 /*
498  * omap3isp_video_buffer_next - Complete the current buffer and return the next
499  * @video: ISP video object
500  *
501  * Remove the current video buffer from the DMA queue and fill its timestamp and
502  * field count before handing it back to videobuf2.
503  *
504  * For capture video nodes the buffer state is set to VB2_BUF_STATE_DONE if no
505  * error has been flagged in the pipeline, or to VB2_BUF_STATE_ERROR otherwise.
506  * For video output nodes the buffer state is always set to VB2_BUF_STATE_DONE.
507  *
508  * The DMA queue is expected to contain at least one buffer.
509  *
510  * Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
511  * empty.
512  */
omap3isp_video_buffer_next(struct isp_video * video)513 struct isp_buffer *omap3isp_video_buffer_next(struct isp_video *video)
514 {
515 	struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
516 	enum vb2_buffer_state vb_state;
517 	struct isp_buffer *buf;
518 	unsigned long flags;
519 
520 	spin_lock_irqsave(&video->irqlock, flags);
521 	if (WARN_ON(list_empty(&video->dmaqueue))) {
522 		spin_unlock_irqrestore(&video->irqlock, flags);
523 		return NULL;
524 	}
525 
526 	buf = list_first_entry(&video->dmaqueue, struct isp_buffer,
527 			       irqlist);
528 	list_del(&buf->irqlist);
529 	spin_unlock_irqrestore(&video->irqlock, flags);
530 
531 	buf->vb.vb2_buf.timestamp = ktime_get_ns();
532 
533 	/* Do frame number propagation only if this is the output video node.
534 	 * Frame number either comes from the CSI receivers or it gets
535 	 * incremented here if H3A is not active.
536 	 * Note: There is no guarantee that the output buffer will finish
537 	 * first, so the input number might lag behind by 1 in some cases.
538 	 */
539 	if (video == pipe->output && !pipe->do_propagation)
540 		buf->vb.sequence =
541 			atomic_inc_return(&pipe->frame_number);
542 	else
543 		buf->vb.sequence = atomic_read(&pipe->frame_number);
544 
545 	if (pipe->field != V4L2_FIELD_NONE)
546 		buf->vb.sequence /= 2;
547 
548 	buf->vb.field = pipe->field;
549 
550 	/* Report pipeline errors to userspace on the capture device side. */
551 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->error) {
552 		vb_state = VB2_BUF_STATE_ERROR;
553 		pipe->error = false;
554 	} else {
555 		vb_state = VB2_BUF_STATE_DONE;
556 	}
557 
558 	vb2_buffer_done(&buf->vb.vb2_buf, vb_state);
559 
560 	spin_lock_irqsave(&video->irqlock, flags);
561 
562 	if (list_empty(&video->dmaqueue)) {
563 		enum isp_pipeline_state state;
564 
565 		spin_unlock_irqrestore(&video->irqlock, flags);
566 
567 		if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
568 			state = ISP_PIPELINE_QUEUE_OUTPUT
569 			      | ISP_PIPELINE_STREAM;
570 		else
571 			state = ISP_PIPELINE_QUEUE_INPUT
572 			      | ISP_PIPELINE_STREAM;
573 
574 		spin_lock_irqsave(&pipe->lock, flags);
575 		pipe->state &= ~state;
576 		if (video->pipe.stream_state == ISP_PIPELINE_STREAM_CONTINUOUS)
577 			video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
578 		spin_unlock_irqrestore(&pipe->lock, flags);
579 		return NULL;
580 	}
581 
582 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input != NULL) {
583 		spin_lock(&pipe->lock);
584 		pipe->state &= ~ISP_PIPELINE_STREAM;
585 		spin_unlock(&pipe->lock);
586 	}
587 
588 	buf = list_first_entry(&video->dmaqueue, struct isp_buffer,
589 			       irqlist);
590 
591 	spin_unlock_irqrestore(&video->irqlock, flags);
592 
593 	return buf;
594 }
595 
596 /*
597  * omap3isp_video_cancel_stream - Cancel stream on a video node
598  * @video: ISP video object
599  *
600  * Cancelling a stream returns all buffers queued on the video node to videobuf2
601  * in the erroneous state and makes sure no new buffer can be queued.
602  */
omap3isp_video_cancel_stream(struct isp_video * video)603 void omap3isp_video_cancel_stream(struct isp_video *video)
604 {
605 	unsigned long flags;
606 
607 	spin_lock_irqsave(&video->irqlock, flags);
608 	omap3isp_video_return_buffers(video, VB2_BUF_STATE_ERROR);
609 	video->error = true;
610 	spin_unlock_irqrestore(&video->irqlock, flags);
611 }
612 
613 /*
614  * omap3isp_video_resume - Perform resume operation on the buffers
615  * @video: ISP video object
616  * @continuous: Pipeline is in single shot mode if 0 or continuous mode otherwise
617  *
618  * This function is intended to be used on suspend/resume scenario. It
619  * requests video queue layer to discard buffers marked as DONE if it's in
620  * continuous mode and requests ISP modules to queue again the ACTIVE buffer
621  * if there's any.
622  */
omap3isp_video_resume(struct isp_video * video,int continuous)623 void omap3isp_video_resume(struct isp_video *video, int continuous)
624 {
625 	struct isp_buffer *buf = NULL;
626 
627 	if (continuous && video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
628 		mutex_lock(&video->queue_lock);
629 		vb2_discard_done(video->queue);
630 		mutex_unlock(&video->queue_lock);
631 	}
632 
633 	if (!list_empty(&video->dmaqueue)) {
634 		buf = list_first_entry(&video->dmaqueue,
635 				       struct isp_buffer, irqlist);
636 		video->ops->queue(video, buf);
637 		video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_QUEUED;
638 	} else {
639 		if (continuous)
640 			video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
641 	}
642 }
643 
644 /* -----------------------------------------------------------------------------
645  * V4L2 ioctls
646  */
647 
648 static int
isp_video_querycap(struct file * file,void * fh,struct v4l2_capability * cap)649 isp_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
650 {
651 	struct isp_video *video = video_drvdata(file);
652 
653 	strscpy(cap->driver, ISP_VIDEO_DRIVER_NAME, sizeof(cap->driver));
654 	strscpy(cap->card, video->video.name, sizeof(cap->card));
655 	strscpy(cap->bus_info, "media", sizeof(cap->bus_info));
656 
657 	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT
658 		| V4L2_CAP_STREAMING | V4L2_CAP_DEVICE_CAPS;
659 
660 
661 	return 0;
662 }
663 
664 static int
isp_video_get_format(struct file * file,void * fh,struct v4l2_format * format)665 isp_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
666 {
667 	struct isp_video_fh *vfh = to_isp_video_fh(fh);
668 	struct isp_video *video = video_drvdata(file);
669 
670 	if (format->type != video->type)
671 		return -EINVAL;
672 
673 	mutex_lock(&video->mutex);
674 	*format = vfh->format;
675 	mutex_unlock(&video->mutex);
676 
677 	return 0;
678 }
679 
680 static int
isp_video_set_format(struct file * file,void * fh,struct v4l2_format * format)681 isp_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
682 {
683 	struct isp_video_fh *vfh = to_isp_video_fh(fh);
684 	struct isp_video *video = video_drvdata(file);
685 	struct v4l2_mbus_framefmt fmt;
686 
687 	if (format->type != video->type)
688 		return -EINVAL;
689 
690 	/* Replace unsupported field orders with sane defaults. */
691 	switch (format->fmt.pix.field) {
692 	case V4L2_FIELD_NONE:
693 		/* Progressive is supported everywhere. */
694 		break;
695 	case V4L2_FIELD_ALTERNATE:
696 		/* ALTERNATE is not supported on output nodes. */
697 		if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
698 			format->fmt.pix.field = V4L2_FIELD_NONE;
699 		break;
700 	case V4L2_FIELD_INTERLACED:
701 		/* The ISP has no concept of video standard, select the
702 		 * top-bottom order when the unqualified interlaced order is
703 		 * requested.
704 		 */
705 		format->fmt.pix.field = V4L2_FIELD_INTERLACED_TB;
706 		fallthrough;
707 	case V4L2_FIELD_INTERLACED_TB:
708 	case V4L2_FIELD_INTERLACED_BT:
709 		/* Interlaced orders are only supported at the CCDC output. */
710 		if (video != &video->isp->isp_ccdc.video_out)
711 			format->fmt.pix.field = V4L2_FIELD_NONE;
712 		break;
713 	case V4L2_FIELD_TOP:
714 	case V4L2_FIELD_BOTTOM:
715 	case V4L2_FIELD_SEQ_TB:
716 	case V4L2_FIELD_SEQ_BT:
717 	default:
718 		/* All other field orders are currently unsupported, default to
719 		 * progressive.
720 		 */
721 		format->fmt.pix.field = V4L2_FIELD_NONE;
722 		break;
723 	}
724 
725 	/* Fill the bytesperline and sizeimage fields by converting to media bus
726 	 * format and back to pixel format.
727 	 */
728 	isp_video_pix_to_mbus(&format->fmt.pix, &fmt);
729 	isp_video_mbus_to_pix(video, &fmt, &format->fmt.pix);
730 
731 	mutex_lock(&video->mutex);
732 	vfh->format = *format;
733 	mutex_unlock(&video->mutex);
734 
735 	return 0;
736 }
737 
738 static int
isp_video_try_format(struct file * file,void * fh,struct v4l2_format * format)739 isp_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
740 {
741 	struct isp_video *video = video_drvdata(file);
742 	struct v4l2_subdev_format fmt;
743 	struct v4l2_subdev *subdev;
744 	u32 pad;
745 	int ret;
746 
747 	if (format->type != video->type)
748 		return -EINVAL;
749 
750 	subdev = isp_video_remote_subdev(video, &pad);
751 	if (subdev == NULL)
752 		return -EINVAL;
753 
754 	isp_video_pix_to_mbus(&format->fmt.pix, &fmt.format);
755 
756 	fmt.pad = pad;
757 	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
758 	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
759 	if (ret)
760 		return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
761 
762 	isp_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
763 	return 0;
764 }
765 
766 static int
isp_video_get_selection(struct file * file,void * fh,struct v4l2_selection * sel)767 isp_video_get_selection(struct file *file, void *fh, struct v4l2_selection *sel)
768 {
769 	struct isp_video *video = video_drvdata(file);
770 	struct v4l2_subdev_format format;
771 	struct v4l2_subdev *subdev;
772 	struct v4l2_subdev_selection sdsel = {
773 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
774 		.target = sel->target,
775 	};
776 	u32 pad;
777 	int ret;
778 
779 	switch (sel->target) {
780 	case V4L2_SEL_TGT_CROP:
781 	case V4L2_SEL_TGT_CROP_BOUNDS:
782 	case V4L2_SEL_TGT_CROP_DEFAULT:
783 		if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
784 			return -EINVAL;
785 		break;
786 	case V4L2_SEL_TGT_COMPOSE:
787 	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
788 	case V4L2_SEL_TGT_COMPOSE_DEFAULT:
789 		if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
790 			return -EINVAL;
791 		break;
792 	default:
793 		return -EINVAL;
794 	}
795 	subdev = isp_video_remote_subdev(video, &pad);
796 	if (subdev == NULL)
797 		return -EINVAL;
798 
799 	/* Try the get selection operation first and fallback to get format if not
800 	 * implemented.
801 	 */
802 	sdsel.pad = pad;
803 	ret = v4l2_subdev_call(subdev, pad, get_selection, NULL, &sdsel);
804 	if (!ret)
805 		sel->r = sdsel.r;
806 	if (ret != -ENOIOCTLCMD)
807 		return ret;
808 
809 	format.pad = pad;
810 	format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
811 	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
812 	if (ret < 0)
813 		return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
814 
815 	sel->r.left = 0;
816 	sel->r.top = 0;
817 	sel->r.width = format.format.width;
818 	sel->r.height = format.format.height;
819 
820 	return 0;
821 }
822 
823 static int
isp_video_set_selection(struct file * file,void * fh,struct v4l2_selection * sel)824 isp_video_set_selection(struct file *file, void *fh, struct v4l2_selection *sel)
825 {
826 	struct isp_video *video = video_drvdata(file);
827 	struct v4l2_subdev *subdev;
828 	struct v4l2_subdev_selection sdsel = {
829 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
830 		.target = sel->target,
831 		.flags = sel->flags,
832 		.r = sel->r,
833 	};
834 	u32 pad;
835 	int ret;
836 
837 	switch (sel->target) {
838 	case V4L2_SEL_TGT_CROP:
839 		if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
840 			return -EINVAL;
841 		break;
842 	case V4L2_SEL_TGT_COMPOSE:
843 		if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
844 			return -EINVAL;
845 		break;
846 	default:
847 		return -EINVAL;
848 	}
849 	subdev = isp_video_remote_subdev(video, &pad);
850 	if (subdev == NULL)
851 		return -EINVAL;
852 
853 	sdsel.pad = pad;
854 	mutex_lock(&video->mutex);
855 	ret = v4l2_subdev_call(subdev, pad, set_selection, NULL, &sdsel);
856 	mutex_unlock(&video->mutex);
857 	if (!ret)
858 		sel->r = sdsel.r;
859 
860 	return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
861 }
862 
863 static int
isp_video_get_param(struct file * file,void * fh,struct v4l2_streamparm * a)864 isp_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
865 {
866 	struct isp_video_fh *vfh = to_isp_video_fh(fh);
867 	struct isp_video *video = video_drvdata(file);
868 
869 	if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
870 	    video->type != a->type)
871 		return -EINVAL;
872 
873 	memset(a, 0, sizeof(*a));
874 	a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
875 	a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
876 	a->parm.output.timeperframe = vfh->timeperframe;
877 
878 	return 0;
879 }
880 
881 static int
isp_video_set_param(struct file * file,void * fh,struct v4l2_streamparm * a)882 isp_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
883 {
884 	struct isp_video_fh *vfh = to_isp_video_fh(fh);
885 	struct isp_video *video = video_drvdata(file);
886 
887 	if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
888 	    video->type != a->type)
889 		return -EINVAL;
890 
891 	if (a->parm.output.timeperframe.denominator == 0)
892 		a->parm.output.timeperframe.denominator = 1;
893 
894 	vfh->timeperframe = a->parm.output.timeperframe;
895 
896 	return 0;
897 }
898 
899 static int
isp_video_reqbufs(struct file * file,void * fh,struct v4l2_requestbuffers * rb)900 isp_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
901 {
902 	struct isp_video_fh *vfh = to_isp_video_fh(fh);
903 	struct isp_video *video = video_drvdata(file);
904 	int ret;
905 
906 	mutex_lock(&video->queue_lock);
907 	ret = vb2_reqbufs(&vfh->queue, rb);
908 	mutex_unlock(&video->queue_lock);
909 
910 	return ret;
911 }
912 
913 static int
isp_video_querybuf(struct file * file,void * fh,struct v4l2_buffer * b)914 isp_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
915 {
916 	struct isp_video_fh *vfh = to_isp_video_fh(fh);
917 	struct isp_video *video = video_drvdata(file);
918 	int ret;
919 
920 	mutex_lock(&video->queue_lock);
921 	ret = vb2_querybuf(&vfh->queue, b);
922 	mutex_unlock(&video->queue_lock);
923 
924 	return ret;
925 }
926 
927 static int
isp_video_qbuf(struct file * file,void * fh,struct v4l2_buffer * b)928 isp_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
929 {
930 	struct isp_video_fh *vfh = to_isp_video_fh(fh);
931 	struct isp_video *video = video_drvdata(file);
932 	int ret;
933 
934 	mutex_lock(&video->queue_lock);
935 	ret = vb2_qbuf(&vfh->queue, video->video.v4l2_dev->mdev, b);
936 	mutex_unlock(&video->queue_lock);
937 
938 	return ret;
939 }
940 
941 static int
isp_video_dqbuf(struct file * file,void * fh,struct v4l2_buffer * b)942 isp_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
943 {
944 	struct isp_video_fh *vfh = to_isp_video_fh(fh);
945 	struct isp_video *video = video_drvdata(file);
946 	int ret;
947 
948 	mutex_lock(&video->queue_lock);
949 	ret = vb2_dqbuf(&vfh->queue, b, file->f_flags & O_NONBLOCK);
950 	mutex_unlock(&video->queue_lock);
951 
952 	return ret;
953 }
954 
isp_video_check_external_subdevs(struct isp_video * video,struct isp_pipeline * pipe)955 static int isp_video_check_external_subdevs(struct isp_video *video,
956 					    struct isp_pipeline *pipe)
957 {
958 	struct isp_device *isp = video->isp;
959 	struct media_entity *ents[] = {
960 		&isp->isp_csi2a.subdev.entity,
961 		&isp->isp_csi2c.subdev.entity,
962 		&isp->isp_ccp2.subdev.entity,
963 		&isp->isp_ccdc.subdev.entity
964 	};
965 	struct media_pad *source_pad;
966 	struct media_entity *source = NULL;
967 	struct media_entity *sink;
968 	struct v4l2_subdev_format fmt;
969 	struct v4l2_ext_controls ctrls;
970 	struct v4l2_ext_control ctrl;
971 	unsigned int i;
972 	int ret;
973 
974 	/* Memory-to-memory pipelines have no external subdev. */
975 	if (pipe->input != NULL)
976 		return 0;
977 
978 	for (i = 0; i < ARRAY_SIZE(ents); i++) {
979 		/* Is the entity part of the pipeline? */
980 		if (!media_entity_enum_test(&pipe->ent_enum, ents[i]))
981 			continue;
982 
983 		/* ISP entities have always sink pad == 0. Find source. */
984 		source_pad = media_pad_remote_pad_first(&ents[i]->pads[0]);
985 		if (source_pad == NULL)
986 			continue;
987 
988 		source = source_pad->entity;
989 		sink = ents[i];
990 		break;
991 	}
992 
993 	if (!source) {
994 		dev_warn(isp->dev, "can't find source, failing now\n");
995 		return -EINVAL;
996 	}
997 
998 	if (!is_media_entity_v4l2_subdev(source))
999 		return 0;
1000 
1001 	pipe->external = media_entity_to_v4l2_subdev(source);
1002 
1003 	fmt.pad = source_pad->index;
1004 	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
1005 	ret = v4l2_subdev_call(media_entity_to_v4l2_subdev(sink),
1006 			       pad, get_fmt, NULL, &fmt);
1007 	if (unlikely(ret < 0)) {
1008 		dev_warn(isp->dev, "get_fmt returned null!\n");
1009 		return ret;
1010 	}
1011 
1012 	pipe->external_width =
1013 		omap3isp_video_format_info(fmt.format.code)->width;
1014 
1015 	memset(&ctrls, 0, sizeof(ctrls));
1016 	memset(&ctrl, 0, sizeof(ctrl));
1017 
1018 	ctrl.id = V4L2_CID_PIXEL_RATE;
1019 
1020 	ctrls.count = 1;
1021 	ctrls.controls = &ctrl;
1022 	ret = v4l2_g_ext_ctrls(pipe->external->ctrl_handler, &video->video,
1023 			       NULL, &ctrls);
1024 	if (ret < 0) {
1025 		dev_warn(isp->dev, "no pixel rate control in subdev %s\n",
1026 			 pipe->external->name);
1027 		return ret;
1028 	}
1029 
1030 	pipe->external_rate = ctrl.value64;
1031 
1032 	if (media_entity_enum_test(&pipe->ent_enum,
1033 				   &isp->isp_ccdc.subdev.entity)) {
1034 		unsigned int rate = UINT_MAX;
1035 		/*
1036 		 * Check that maximum allowed CCDC pixel rate isn't
1037 		 * exceeded by the pixel rate.
1038 		 */
1039 		omap3isp_ccdc_max_rate(&isp->isp_ccdc, &rate);
1040 		if (pipe->external_rate > rate)
1041 			return -ENOSPC;
1042 	}
1043 
1044 	return 0;
1045 }
1046 
1047 /*
1048  * Stream management
1049  *
1050  * Every ISP pipeline has a single input and a single output. The input can be
1051  * either a sensor or a video node. The output is always a video node.
1052  *
1053  * As every pipeline has an output video node, the ISP video objects at the
1054  * pipeline output stores the pipeline state. It tracks the streaming state of
1055  * both the input and output, as well as the availability of buffers.
1056  *
1057  * In sensor-to-memory mode, frames are always available at the pipeline input.
1058  * Starting the sensor usually requires I2C transfers and must be done in
1059  * interruptible context. The pipeline is started and stopped synchronously
1060  * to the stream on/off commands. All modules in the pipeline will get their
1061  * subdev set stream handler called. The module at the end of the pipeline must
1062  * delay starting the hardware until buffers are available at its output.
1063  *
1064  * In memory-to-memory mode, starting/stopping the stream requires
1065  * synchronization between the input and output. ISP modules can't be stopped
1066  * in the middle of a frame, and at least some of the modules seem to become
1067  * busy as soon as they're started, even if they don't receive a frame start
1068  * event. For that reason frames need to be processed in single-shot mode. The
1069  * driver needs to wait until a frame is completely processed and written to
1070  * memory before restarting the pipeline for the next frame. Pipelined
1071  * processing might be possible but requires more testing.
1072  *
1073  * Stream start must be delayed until buffers are available at both the input
1074  * and output. The pipeline must be started in the vb2 queue callback with
1075  * the buffers queue spinlock held. The modules subdev set stream operation must
1076  * not sleep.
1077  */
1078 static int
isp_video_streamon(struct file * file,void * fh,enum v4l2_buf_type type)1079 isp_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
1080 {
1081 	struct isp_video_fh *vfh = to_isp_video_fh(fh);
1082 	struct isp_video *video = video_drvdata(file);
1083 	enum isp_pipeline_state state;
1084 	struct isp_pipeline *pipe;
1085 	unsigned long flags;
1086 	int ret;
1087 
1088 	if (type != video->type)
1089 		return -EINVAL;
1090 
1091 	mutex_lock(&video->stream_lock);
1092 
1093 	/* Start streaming on the pipeline. No link touching an entity in the
1094 	 * pipeline can be activated or deactivated once streaming is started.
1095 	 */
1096 	pipe = to_isp_pipeline(&video->video.entity) ? : &video->pipe;
1097 
1098 	ret = media_entity_enum_init(&pipe->ent_enum, &video->isp->media_dev);
1099 	if (ret)
1100 		goto err_enum_init;
1101 
1102 	/* TODO: Implement PM QoS */
1103 	pipe->l3_ick = clk_get_rate(video->isp->clock[ISP_CLK_L3_ICK]);
1104 	pipe->max_rate = pipe->l3_ick;
1105 
1106 	ret = video_device_pipeline_start(&video->video, &pipe->pipe);
1107 	if (ret < 0)
1108 		goto err_pipeline_start;
1109 
1110 	/* Verify that the currently configured format matches the output of
1111 	 * the connected subdev.
1112 	 */
1113 	ret = isp_video_check_format(video, vfh);
1114 	if (ret < 0)
1115 		goto err_check_format;
1116 
1117 	video->bpl_padding = ret;
1118 	video->bpl_value = vfh->format.fmt.pix.bytesperline;
1119 
1120 	ret = isp_video_get_graph_data(video, pipe);
1121 	if (ret < 0)
1122 		goto err_check_format;
1123 
1124 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1125 		state = ISP_PIPELINE_STREAM_OUTPUT | ISP_PIPELINE_IDLE_OUTPUT;
1126 	else
1127 		state = ISP_PIPELINE_STREAM_INPUT | ISP_PIPELINE_IDLE_INPUT;
1128 
1129 	ret = isp_video_check_external_subdevs(video, pipe);
1130 	if (ret < 0)
1131 		goto err_check_format;
1132 
1133 	pipe->error = false;
1134 
1135 	spin_lock_irqsave(&pipe->lock, flags);
1136 	pipe->state &= ~ISP_PIPELINE_STREAM;
1137 	pipe->state |= state;
1138 	spin_unlock_irqrestore(&pipe->lock, flags);
1139 
1140 	/* Set the maximum time per frame as the value requested by userspace.
1141 	 * This is a soft limit that can be overridden if the hardware doesn't
1142 	 * support the request limit.
1143 	 */
1144 	if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
1145 		pipe->max_timeperframe = vfh->timeperframe;
1146 
1147 	video->queue = &vfh->queue;
1148 	INIT_LIST_HEAD(&video->dmaqueue);
1149 	atomic_set(&pipe->frame_number, -1);
1150 	pipe->field = vfh->format.fmt.pix.field;
1151 
1152 	mutex_lock(&video->queue_lock);
1153 	ret = vb2_streamon(&vfh->queue, type);
1154 	mutex_unlock(&video->queue_lock);
1155 	if (ret < 0)
1156 		goto err_check_format;
1157 
1158 	mutex_unlock(&video->stream_lock);
1159 
1160 	return 0;
1161 
1162 err_check_format:
1163 	video_device_pipeline_stop(&video->video);
1164 err_pipeline_start:
1165 	/* TODO: Implement PM QoS */
1166 	/* The DMA queue must be emptied here, otherwise CCDC interrupts that
1167 	 * will get triggered the next time the CCDC is powered up will try to
1168 	 * access buffers that might have been freed but still present in the
1169 	 * DMA queue. This can easily get triggered if the above
1170 	 * omap3isp_pipeline_set_stream() call fails on a system with a
1171 	 * free-running sensor.
1172 	 */
1173 	INIT_LIST_HEAD(&video->dmaqueue);
1174 	video->queue = NULL;
1175 
1176 	media_entity_enum_cleanup(&pipe->ent_enum);
1177 
1178 err_enum_init:
1179 	mutex_unlock(&video->stream_lock);
1180 
1181 	return ret;
1182 }
1183 
1184 static int
isp_video_streamoff(struct file * file,void * fh,enum v4l2_buf_type type)1185 isp_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
1186 {
1187 	struct isp_video_fh *vfh = to_isp_video_fh(fh);
1188 	struct isp_video *video = video_drvdata(file);
1189 	struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
1190 	enum isp_pipeline_state state;
1191 	unsigned int streaming;
1192 	unsigned long flags;
1193 
1194 	if (type != video->type)
1195 		return -EINVAL;
1196 
1197 	mutex_lock(&video->stream_lock);
1198 
1199 	/* Make sure we're not streaming yet. */
1200 	mutex_lock(&video->queue_lock);
1201 	streaming = vb2_is_streaming(&vfh->queue);
1202 	mutex_unlock(&video->queue_lock);
1203 
1204 	if (!streaming)
1205 		goto done;
1206 
1207 	/* Update the pipeline state. */
1208 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1209 		state = ISP_PIPELINE_STREAM_OUTPUT
1210 		      | ISP_PIPELINE_QUEUE_OUTPUT;
1211 	else
1212 		state = ISP_PIPELINE_STREAM_INPUT
1213 		      | ISP_PIPELINE_QUEUE_INPUT;
1214 
1215 	spin_lock_irqsave(&pipe->lock, flags);
1216 	pipe->state &= ~state;
1217 	spin_unlock_irqrestore(&pipe->lock, flags);
1218 
1219 	/* Stop the stream. */
1220 	omap3isp_pipeline_set_stream(pipe, ISP_PIPELINE_STREAM_STOPPED);
1221 	omap3isp_video_cancel_stream(video);
1222 
1223 	mutex_lock(&video->queue_lock);
1224 	vb2_streamoff(&vfh->queue, type);
1225 	mutex_unlock(&video->queue_lock);
1226 	video->queue = NULL;
1227 	video->error = false;
1228 
1229 	/* TODO: Implement PM QoS */
1230 	video_device_pipeline_stop(&video->video);
1231 
1232 	media_entity_enum_cleanup(&pipe->ent_enum);
1233 
1234 done:
1235 	mutex_unlock(&video->stream_lock);
1236 	return 0;
1237 }
1238 
1239 static int
isp_video_enum_input(struct file * file,void * fh,struct v4l2_input * input)1240 isp_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
1241 {
1242 	if (input->index > 0)
1243 		return -EINVAL;
1244 
1245 	strscpy(input->name, "camera", sizeof(input->name));
1246 	input->type = V4L2_INPUT_TYPE_CAMERA;
1247 
1248 	return 0;
1249 }
1250 
1251 static int
isp_video_g_input(struct file * file,void * fh,unsigned int * input)1252 isp_video_g_input(struct file *file, void *fh, unsigned int *input)
1253 {
1254 	*input = 0;
1255 
1256 	return 0;
1257 }
1258 
1259 static int
isp_video_s_input(struct file * file,void * fh,unsigned int input)1260 isp_video_s_input(struct file *file, void *fh, unsigned int input)
1261 {
1262 	return input == 0 ? 0 : -EINVAL;
1263 }
1264 
1265 static const struct v4l2_ioctl_ops isp_video_ioctl_ops = {
1266 	.vidioc_querycap		= isp_video_querycap,
1267 	.vidioc_g_fmt_vid_cap		= isp_video_get_format,
1268 	.vidioc_s_fmt_vid_cap		= isp_video_set_format,
1269 	.vidioc_try_fmt_vid_cap		= isp_video_try_format,
1270 	.vidioc_g_fmt_vid_out		= isp_video_get_format,
1271 	.vidioc_s_fmt_vid_out		= isp_video_set_format,
1272 	.vidioc_try_fmt_vid_out		= isp_video_try_format,
1273 	.vidioc_g_selection		= isp_video_get_selection,
1274 	.vidioc_s_selection		= isp_video_set_selection,
1275 	.vidioc_g_parm			= isp_video_get_param,
1276 	.vidioc_s_parm			= isp_video_set_param,
1277 	.vidioc_reqbufs			= isp_video_reqbufs,
1278 	.vidioc_querybuf		= isp_video_querybuf,
1279 	.vidioc_qbuf			= isp_video_qbuf,
1280 	.vidioc_dqbuf			= isp_video_dqbuf,
1281 	.vidioc_streamon		= isp_video_streamon,
1282 	.vidioc_streamoff		= isp_video_streamoff,
1283 	.vidioc_enum_input		= isp_video_enum_input,
1284 	.vidioc_g_input			= isp_video_g_input,
1285 	.vidioc_s_input			= isp_video_s_input,
1286 };
1287 
1288 /* -----------------------------------------------------------------------------
1289  * V4L2 file operations
1290  */
1291 
isp_video_open(struct file * file)1292 static int isp_video_open(struct file *file)
1293 {
1294 	struct isp_video *video = video_drvdata(file);
1295 	struct isp_video_fh *handle;
1296 	struct vb2_queue *queue;
1297 	int ret = 0;
1298 
1299 	handle = kzalloc(sizeof(*handle), GFP_KERNEL);
1300 	if (handle == NULL)
1301 		return -ENOMEM;
1302 
1303 	v4l2_fh_init(&handle->vfh, &video->video);
1304 	v4l2_fh_add(&handle->vfh);
1305 
1306 	/* If this is the first user, initialise the pipeline. */
1307 	if (omap3isp_get(video->isp) == NULL) {
1308 		ret = -EBUSY;
1309 		goto done;
1310 	}
1311 
1312 	ret = v4l2_pipeline_pm_get(&video->video.entity);
1313 	if (ret < 0) {
1314 		omap3isp_put(video->isp);
1315 		goto done;
1316 	}
1317 
1318 	queue = &handle->queue;
1319 	queue->type = video->type;
1320 	queue->io_modes = VB2_MMAP | VB2_USERPTR;
1321 	queue->drv_priv = handle;
1322 	queue->ops = &isp_video_queue_ops;
1323 	queue->mem_ops = &vb2_dma_contig_memops;
1324 	queue->buf_struct_size = sizeof(struct isp_buffer);
1325 	queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1326 	queue->dev = video->isp->dev;
1327 
1328 	ret = vb2_queue_init(&handle->queue);
1329 	if (ret < 0) {
1330 		omap3isp_put(video->isp);
1331 		goto done;
1332 	}
1333 
1334 	memset(&handle->format, 0, sizeof(handle->format));
1335 	handle->format.type = video->type;
1336 	handle->timeperframe.denominator = 1;
1337 
1338 	handle->video = video;
1339 	file->private_data = &handle->vfh;
1340 
1341 done:
1342 	if (ret < 0) {
1343 		v4l2_fh_del(&handle->vfh);
1344 		v4l2_fh_exit(&handle->vfh);
1345 		kfree(handle);
1346 	}
1347 
1348 	return ret;
1349 }
1350 
isp_video_release(struct file * file)1351 static int isp_video_release(struct file *file)
1352 {
1353 	struct isp_video *video = video_drvdata(file);
1354 	struct v4l2_fh *vfh = file->private_data;
1355 	struct isp_video_fh *handle = to_isp_video_fh(vfh);
1356 
1357 	/* Disable streaming and free the buffers queue resources. */
1358 	isp_video_streamoff(file, vfh, video->type);
1359 
1360 	mutex_lock(&video->queue_lock);
1361 	vb2_queue_release(&handle->queue);
1362 	mutex_unlock(&video->queue_lock);
1363 
1364 	v4l2_pipeline_pm_put(&video->video.entity);
1365 
1366 	/* Release the file handle. */
1367 	v4l2_fh_del(vfh);
1368 	v4l2_fh_exit(vfh);
1369 	kfree(handle);
1370 	file->private_data = NULL;
1371 
1372 	omap3isp_put(video->isp);
1373 
1374 	return 0;
1375 }
1376 
isp_video_poll(struct file * file,poll_table * wait)1377 static __poll_t isp_video_poll(struct file *file, poll_table *wait)
1378 {
1379 	struct isp_video_fh *vfh = to_isp_video_fh(file->private_data);
1380 	struct isp_video *video = video_drvdata(file);
1381 	__poll_t ret;
1382 
1383 	mutex_lock(&video->queue_lock);
1384 	ret = vb2_poll(&vfh->queue, file, wait);
1385 	mutex_unlock(&video->queue_lock);
1386 
1387 	return ret;
1388 }
1389 
isp_video_mmap(struct file * file,struct vm_area_struct * vma)1390 static int isp_video_mmap(struct file *file, struct vm_area_struct *vma)
1391 {
1392 	struct isp_video_fh *vfh = to_isp_video_fh(file->private_data);
1393 
1394 	return vb2_mmap(&vfh->queue, vma);
1395 }
1396 
1397 static const struct v4l2_file_operations isp_video_fops = {
1398 	.owner = THIS_MODULE,
1399 	.unlocked_ioctl = video_ioctl2,
1400 	.open = isp_video_open,
1401 	.release = isp_video_release,
1402 	.poll = isp_video_poll,
1403 	.mmap = isp_video_mmap,
1404 };
1405 
1406 /* -----------------------------------------------------------------------------
1407  * ISP video core
1408  */
1409 
1410 static const struct isp_video_operations isp_video_dummy_ops = {
1411 };
1412 
omap3isp_video_init(struct isp_video * video,const char * name)1413 int omap3isp_video_init(struct isp_video *video, const char *name)
1414 {
1415 	const char *direction;
1416 	int ret;
1417 
1418 	switch (video->type) {
1419 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1420 		direction = "output";
1421 		video->pad.flags = MEDIA_PAD_FL_SINK
1422 				   | MEDIA_PAD_FL_MUST_CONNECT;
1423 		break;
1424 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1425 		direction = "input";
1426 		video->pad.flags = MEDIA_PAD_FL_SOURCE
1427 				   | MEDIA_PAD_FL_MUST_CONNECT;
1428 		video->video.vfl_dir = VFL_DIR_TX;
1429 		break;
1430 
1431 	default:
1432 		return -EINVAL;
1433 	}
1434 
1435 	ret = media_entity_pads_init(&video->video.entity, 1, &video->pad);
1436 	if (ret < 0)
1437 		return ret;
1438 
1439 	mutex_init(&video->mutex);
1440 	atomic_set(&video->active, 0);
1441 
1442 	spin_lock_init(&video->pipe.lock);
1443 	mutex_init(&video->stream_lock);
1444 	mutex_init(&video->queue_lock);
1445 	spin_lock_init(&video->irqlock);
1446 
1447 	/* Initialize the video device. */
1448 	if (video->ops == NULL)
1449 		video->ops = &isp_video_dummy_ops;
1450 
1451 	video->video.fops = &isp_video_fops;
1452 	snprintf(video->video.name, sizeof(video->video.name),
1453 		 "OMAP3 ISP %s %s", name, direction);
1454 	video->video.vfl_type = VFL_TYPE_VIDEO;
1455 	video->video.release = video_device_release_empty;
1456 	video->video.ioctl_ops = &isp_video_ioctl_ops;
1457 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1458 		video->video.device_caps = V4L2_CAP_VIDEO_CAPTURE
1459 					 | V4L2_CAP_STREAMING;
1460 	else
1461 		video->video.device_caps = V4L2_CAP_VIDEO_OUTPUT
1462 					 | V4L2_CAP_STREAMING;
1463 
1464 	video->pipe.stream_state = ISP_PIPELINE_STREAM_STOPPED;
1465 
1466 	video_set_drvdata(&video->video, video);
1467 
1468 	return 0;
1469 }
1470 
omap3isp_video_cleanup(struct isp_video * video)1471 void omap3isp_video_cleanup(struct isp_video *video)
1472 {
1473 	media_entity_cleanup(&video->video.entity);
1474 	mutex_destroy(&video->queue_lock);
1475 	mutex_destroy(&video->stream_lock);
1476 	mutex_destroy(&video->mutex);
1477 }
1478 
omap3isp_video_register(struct isp_video * video,struct v4l2_device * vdev)1479 int omap3isp_video_register(struct isp_video *video, struct v4l2_device *vdev)
1480 {
1481 	int ret;
1482 
1483 	video->video.v4l2_dev = vdev;
1484 
1485 	ret = video_register_device(&video->video, VFL_TYPE_VIDEO, -1);
1486 	if (ret < 0)
1487 		dev_err(video->isp->dev,
1488 			"%s: could not register video device (%d)\n",
1489 			__func__, ret);
1490 
1491 	return ret;
1492 }
1493 
omap3isp_video_unregister(struct isp_video * video)1494 void omap3isp_video_unregister(struct isp_video *video)
1495 {
1496 	video_unregister_device(&video->video);
1497 }
1498