4 * Copyright (C) 2013-2015 Ideas on Board
5 * Copyright (C) 2013-2015 Xilinx, Inc.
7 * Contacts: Hyun Kwon <hyun.kwon@xilinx.com>
8 * Laurent Pinchart <laurent.pinchart@ideasonboard.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/dma/xilinx_dma.h>
16 #include <linux/lcm.h>
17 #include <linux/list.h>
18 #include <linux/module.h>
20 #include <linux/slab.h>
22 #include <media/v4l2-dev.h>
23 #include <media/v4l2-fh.h>
24 #include <media/v4l2-ioctl.h>
25 #include <media/videobuf2-v4l2.h>
26 #include <media/videobuf2-dma-contig.h>
28 #include "xilinx-dma.h"
29 #include "xilinx-vip.h"
30 #include "xilinx-vipp.h"
32 #define XVIP_DMA_DEF_FORMAT V4L2_PIX_FMT_YUYV
33 #define XVIP_DMA_DEF_WIDTH 1920
34 #define XVIP_DMA_DEF_HEIGHT 1080
36 /* Minimum and maximum widths are expressed in bytes */
37 #define XVIP_DMA_MIN_WIDTH 1U
38 #define XVIP_DMA_MAX_WIDTH 65535U
39 #define XVIP_DMA_MIN_HEIGHT 1U
40 #define XVIP_DMA_MAX_HEIGHT 8191U
42 /* -----------------------------------------------------------------------------
46 static struct v4l2_subdev *
47 xvip_dma_remote_subdev(struct media_pad *local, u32 *pad)
49 struct media_pad *remote;
51 remote = media_entity_remote_pad(local);
53 media_entity_type(remote->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
59 return media_entity_to_v4l2_subdev(remote->entity);
62 static int xvip_dma_verify_format(struct xvip_dma *dma)
64 struct v4l2_subdev_format fmt;
65 struct v4l2_subdev *subdev;
68 subdev = xvip_dma_remote_subdev(&dma->pad, &fmt.pad);
72 fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
73 ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
75 return ret == -ENOIOCTLCMD ? -EINVAL : ret;
77 if (dma->fmtinfo->code != fmt.format.code ||
78 dma->format.height != fmt.format.height ||
79 dma->format.width != fmt.format.width ||
80 dma->format.colorspace != fmt.format.colorspace)
86 /* -----------------------------------------------------------------------------
87 * Pipeline Stream Management
91 * xvip_pipeline_start_stop - Start ot stop streaming on a pipeline
93 * @start: Start (when true) or stop (when false) the pipeline
95 * Walk the entities chain starting at the pipeline output video node and start
96 * or stop all of them.
98 * Return: 0 if successful, or the return value of the failed video::s_stream
99 * operation otherwise.
101 static int xvip_pipeline_start_stop(struct xvip_pipeline *pipe, bool start)
103 struct xvip_dma *dma = pipe->output;
104 struct media_entity *entity;
105 struct media_pad *pad;
106 struct v4l2_subdev *subdev;
109 entity = &dma->video.entity;
111 pad = &entity->pads[0];
112 if (!(pad->flags & MEDIA_PAD_FL_SINK))
115 pad = media_entity_remote_pad(pad);
117 media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
120 entity = pad->entity;
121 subdev = media_entity_to_v4l2_subdev(entity);
123 ret = v4l2_subdev_call(subdev, video, s_stream, start);
124 if (start && ret < 0 && ret != -ENOIOCTLCMD)
132 * xvip_pipeline_set_stream - Enable/disable streaming on a pipeline
133 * @pipe: The pipeline
134 * @on: Turn the stream on when true or off when false
136 * The pipeline is shared between all DMA engines connect at its input and
137 * output. While the stream state of DMA engines can be controlled
138 * independently, pipelines have a shared stream state that enable or disable
139 * all entities in the pipeline. For this reason the pipeline uses a streaming
140 * counter that tracks the number of DMA engines that have requested the stream
143 * When called with the @on argument set to true, this function will increment
144 * the pipeline streaming count. If the streaming count reaches the number of
145 * DMA engines in the pipeline it will enable all entities that belong to the
148 * Similarly, when called with the @on argument set to false, this function will
149 * decrement the pipeline streaming count and disable all entities in the
150 * pipeline when the streaming count reaches zero.
152 * Return: 0 if successful, or the return value of the failed video::s_stream
153 * operation otherwise. Stopping the pipeline never fails. The pipeline state is
154 * not updated when the operation fails.
156 static int xvip_pipeline_set_stream(struct xvip_pipeline *pipe, bool on)
160 mutex_lock(&pipe->lock);
163 if (pipe->stream_count == pipe->num_dmas - 1) {
164 ret = xvip_pipeline_start_stop(pipe, true);
168 pipe->stream_count++;
170 if (--pipe->stream_count == 0)
171 xvip_pipeline_start_stop(pipe, false);
175 mutex_unlock(&pipe->lock);
179 static int xvip_pipeline_validate(struct xvip_pipeline *pipe,
180 struct xvip_dma *start)
182 struct media_entity_graph graph;
183 struct media_entity *entity = &start->video.entity;
184 struct media_device *mdev = entity->parent;
185 unsigned int num_inputs = 0;
186 unsigned int num_outputs = 0;
188 mutex_lock(&mdev->graph_mutex);
190 /* Walk the graph to locate the video nodes. */
191 media_entity_graph_walk_start(&graph, entity);
193 while ((entity = media_entity_graph_walk_next(&graph))) {
194 struct xvip_dma *dma;
196 if (entity->type != MEDIA_ENT_T_DEVNODE_V4L)
199 dma = to_xvip_dma(media_entity_to_video_device(entity));
201 if (dma->pad.flags & MEDIA_PAD_FL_SINK) {
209 mutex_unlock(&mdev->graph_mutex);
211 /* We need exactly one output and zero or one input. */
212 if (num_outputs != 1 || num_inputs > 1)
215 pipe->num_dmas = num_inputs + num_outputs;
220 static void __xvip_pipeline_cleanup(struct xvip_pipeline *pipe)
227 * xvip_pipeline_cleanup - Cleanup the pipeline after streaming
228 * @pipe: the pipeline
230 * Decrease the pipeline use count and clean it up if we were the last user.
232 static void xvip_pipeline_cleanup(struct xvip_pipeline *pipe)
234 mutex_lock(&pipe->lock);
236 /* If we're the last user clean up the pipeline. */
237 if (--pipe->use_count == 0)
238 __xvip_pipeline_cleanup(pipe);
240 mutex_unlock(&pipe->lock);
244 * xvip_pipeline_prepare - Prepare the pipeline for streaming
245 * @pipe: the pipeline
246 * @dma: DMA engine at one end of the pipeline
248 * Validate the pipeline if no user exists yet, otherwise just increase the use
251 * Return: 0 if successful or -EPIPE if the pipeline is not valid.
253 static int xvip_pipeline_prepare(struct xvip_pipeline *pipe,
254 struct xvip_dma *dma)
258 mutex_lock(&pipe->lock);
260 /* If we're the first user validate and initialize the pipeline. */
261 if (pipe->use_count == 0) {
262 ret = xvip_pipeline_validate(pipe, dma);
264 __xvip_pipeline_cleanup(pipe);
273 mutex_unlock(&pipe->lock);
277 /* -----------------------------------------------------------------------------
278 * videobuf2 queue operations
282 * struct xvip_dma_buffer - Video DMA buffer
283 * @buf: vb2 buffer base object
284 * @queue: buffer list entry in the DMA engine queued buffers list
285 * @dma: DMA channel that uses the buffer
287 struct xvip_dma_buffer {
288 struct vb2_v4l2_buffer buf;
289 struct list_head queue;
290 struct xvip_dma *dma;
293 #define to_xvip_dma_buffer(vb) container_of(vb, struct xvip_dma_buffer, buf)
295 static void xvip_dma_complete(void *param)
297 struct xvip_dma_buffer *buf = param;
298 struct xvip_dma *dma = buf->dma;
300 spin_lock(&dma->queued_lock);
301 list_del(&buf->queue);
302 spin_unlock(&dma->queued_lock);
304 buf->buf.field = V4L2_FIELD_NONE;
305 buf->buf.sequence = dma->sequence++;
306 v4l2_get_timestamp(&buf->buf.timestamp);
307 vb2_set_plane_payload(&buf->buf.vb2_buf, 0, dma->format.sizeimage);
308 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE);
312 xvip_dma_queue_setup(struct vb2_queue *vq,
313 unsigned int *nbuffers, unsigned int *nplanes,
314 unsigned int sizes[], void *alloc_ctxs[])
316 struct xvip_dma *dma = vb2_get_drv_priv(vq);
318 alloc_ctxs[0] = dma->alloc_ctx;
319 /* Make sure the image size is large enough. */
321 return sizes[0] < dma->format.sizeimage ? -EINVAL : 0;
324 sizes[0] = dma->format.sizeimage;
329 static int xvip_dma_buffer_prepare(struct vb2_buffer *vb)
331 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
332 struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue);
333 struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf);
340 static void xvip_dma_buffer_queue(struct vb2_buffer *vb)
342 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
343 struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue);
344 struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf);
345 struct dma_async_tx_descriptor *desc;
346 dma_addr_t addr = vb2_dma_contig_plane_dma_addr(vb, 0);
349 if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
350 flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
351 dma->xt.dir = DMA_DEV_TO_MEM;
352 dma->xt.src_sgl = false;
353 dma->xt.dst_sgl = true;
354 dma->xt.dst_start = addr;
356 flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
357 dma->xt.dir = DMA_MEM_TO_DEV;
358 dma->xt.src_sgl = true;
359 dma->xt.dst_sgl = false;
360 dma->xt.src_start = addr;
363 dma->xt.frame_size = 1;
364 dma->sgl[0].size = dma->format.width * dma->fmtinfo->bpp;
365 dma->sgl[0].icg = dma->format.bytesperline - dma->sgl[0].size;
366 dma->xt.numf = dma->format.height;
368 desc = dmaengine_prep_interleaved_dma(dma->dma, &dma->xt, flags);
370 dev_err(dma->xdev->dev, "Failed to prepare DMA transfer\n");
371 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR);
374 desc->callback = xvip_dma_complete;
375 desc->callback_param = buf;
377 spin_lock_irq(&dma->queued_lock);
378 list_add_tail(&buf->queue, &dma->queued_bufs);
379 spin_unlock_irq(&dma->queued_lock);
381 dmaengine_submit(desc);
383 if (vb2_is_streaming(&dma->queue))
384 dma_async_issue_pending(dma->dma);
387 static int xvip_dma_start_streaming(struct vb2_queue *vq, unsigned int count)
389 struct xvip_dma *dma = vb2_get_drv_priv(vq);
390 struct xvip_dma_buffer *buf, *nbuf;
391 struct xvip_pipeline *pipe;
397 * Start streaming on the pipeline. No link touching an entity in the
398 * pipeline can be activated or deactivated once streaming is started.
400 * Use the pipeline object embedded in the first DMA object that starts
403 pipe = dma->video.entity.pipe
404 ? to_xvip_pipeline(&dma->video.entity) : &dma->pipe;
406 ret = media_entity_pipeline_start(&dma->video.entity, &pipe->pipe);
410 /* Verify that the configured format matches the output of the
413 ret = xvip_dma_verify_format(dma);
417 ret = xvip_pipeline_prepare(pipe, dma);
421 /* Start the DMA engine. This must be done before starting the blocks
422 * in the pipeline to avoid DMA synchronization issues.
424 dma_async_issue_pending(dma->dma);
426 /* Start the pipeline. */
427 xvip_pipeline_set_stream(pipe, true);
432 media_entity_pipeline_stop(&dma->video.entity);
435 /* Give back all queued buffers to videobuf2. */
436 spin_lock_irq(&dma->queued_lock);
437 list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) {
438 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_QUEUED);
439 list_del(&buf->queue);
441 spin_unlock_irq(&dma->queued_lock);
446 static void xvip_dma_stop_streaming(struct vb2_queue *vq)
448 struct xvip_dma *dma = vb2_get_drv_priv(vq);
449 struct xvip_pipeline *pipe = to_xvip_pipeline(&dma->video.entity);
450 struct xvip_dma_buffer *buf, *nbuf;
452 /* Stop the pipeline. */
453 xvip_pipeline_set_stream(pipe, false);
455 /* Stop and reset the DMA engine. */
456 dmaengine_terminate_all(dma->dma);
458 /* Cleanup the pipeline and mark it as being stopped. */
459 xvip_pipeline_cleanup(pipe);
460 media_entity_pipeline_stop(&dma->video.entity);
462 /* Give back all queued buffers to videobuf2. */
463 spin_lock_irq(&dma->queued_lock);
464 list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) {
465 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR);
466 list_del(&buf->queue);
468 spin_unlock_irq(&dma->queued_lock);
471 static struct vb2_ops xvip_dma_queue_qops = {
472 .queue_setup = xvip_dma_queue_setup,
473 .buf_prepare = xvip_dma_buffer_prepare,
474 .buf_queue = xvip_dma_buffer_queue,
475 .wait_prepare = vb2_ops_wait_prepare,
476 .wait_finish = vb2_ops_wait_finish,
477 .start_streaming = xvip_dma_start_streaming,
478 .stop_streaming = xvip_dma_stop_streaming,
481 /* -----------------------------------------------------------------------------
486 xvip_dma_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
488 struct v4l2_fh *vfh = file->private_data;
489 struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
491 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
492 | dma->xdev->v4l2_caps;
494 if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
495 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
497 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
499 strlcpy(cap->driver, "xilinx-vipp", sizeof(cap->driver));
500 strlcpy(cap->card, dma->video.name, sizeof(cap->card));
501 snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s:%u",
502 dma->xdev->dev->of_node->name, dma->port);
507 /* FIXME: without this callback function, some applications are not configured
508 * with correct formats, and it results in frames in wrong format. Whether this
509 * callback needs to be required is not clearly defined, so it should be
510 * clarified through the mailing list.
513 xvip_dma_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
515 struct v4l2_fh *vfh = file->private_data;
516 struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
521 f->pixelformat = dma->format.pixelformat;
522 strlcpy(f->description, dma->fmtinfo->description,
523 sizeof(f->description));
529 xvip_dma_get_format(struct file *file, void *fh, struct v4l2_format *format)
531 struct v4l2_fh *vfh = file->private_data;
532 struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
534 format->fmt.pix = dma->format;
540 __xvip_dma_try_format(struct xvip_dma *dma, struct v4l2_pix_format *pix,
541 const struct xvip_video_format **fmtinfo)
543 const struct xvip_video_format *info;
544 unsigned int min_width;
545 unsigned int max_width;
546 unsigned int min_bpl;
547 unsigned int max_bpl;
552 /* Retrieve format information and select the default format if the
553 * requested format isn't supported.
555 info = xvip_get_format_by_fourcc(pix->pixelformat);
557 info = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT);
559 pix->pixelformat = info->fourcc;
560 pix->field = V4L2_FIELD_NONE;
562 /* The transfer alignment requirements are expressed in bytes. Compute
563 * the minimum and maximum values, clamp the requested width and convert
566 align = lcm(dma->align, info->bpp);
567 min_width = roundup(XVIP_DMA_MIN_WIDTH, align);
568 max_width = rounddown(XVIP_DMA_MAX_WIDTH, align);
569 width = rounddown(pix->width * info->bpp, align);
571 pix->width = clamp(width, min_width, max_width) / info->bpp;
572 pix->height = clamp(pix->height, XVIP_DMA_MIN_HEIGHT,
573 XVIP_DMA_MAX_HEIGHT);
575 /* Clamp the requested bytes per line value. If the maximum bytes per
576 * line value is zero, the module doesn't support user configurable line
577 * sizes. Override the requested value with the minimum in that case.
579 min_bpl = pix->width * info->bpp;
580 max_bpl = rounddown(XVIP_DMA_MAX_WIDTH, dma->align);
581 bpl = rounddown(pix->bytesperline, dma->align);
583 pix->bytesperline = clamp(bpl, min_bpl, max_bpl);
584 pix->sizeimage = pix->bytesperline * pix->height;
591 xvip_dma_try_format(struct file *file, void *fh, struct v4l2_format *format)
593 struct v4l2_fh *vfh = file->private_data;
594 struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
596 __xvip_dma_try_format(dma, &format->fmt.pix, NULL);
601 xvip_dma_set_format(struct file *file, void *fh, struct v4l2_format *format)
603 struct v4l2_fh *vfh = file->private_data;
604 struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
605 const struct xvip_video_format *info;
607 __xvip_dma_try_format(dma, &format->fmt.pix, &info);
609 if (vb2_is_busy(&dma->queue))
612 dma->format = format->fmt.pix;
618 static const struct v4l2_ioctl_ops xvip_dma_ioctl_ops = {
619 .vidioc_querycap = xvip_dma_querycap,
620 .vidioc_enum_fmt_vid_cap = xvip_dma_enum_format,
621 .vidioc_g_fmt_vid_cap = xvip_dma_get_format,
622 .vidioc_g_fmt_vid_out = xvip_dma_get_format,
623 .vidioc_s_fmt_vid_cap = xvip_dma_set_format,
624 .vidioc_s_fmt_vid_out = xvip_dma_set_format,
625 .vidioc_try_fmt_vid_cap = xvip_dma_try_format,
626 .vidioc_try_fmt_vid_out = xvip_dma_try_format,
627 .vidioc_reqbufs = vb2_ioctl_reqbufs,
628 .vidioc_querybuf = vb2_ioctl_querybuf,
629 .vidioc_qbuf = vb2_ioctl_qbuf,
630 .vidioc_dqbuf = vb2_ioctl_dqbuf,
631 .vidioc_create_bufs = vb2_ioctl_create_bufs,
632 .vidioc_expbuf = vb2_ioctl_expbuf,
633 .vidioc_streamon = vb2_ioctl_streamon,
634 .vidioc_streamoff = vb2_ioctl_streamoff,
637 /* -----------------------------------------------------------------------------
638 * V4L2 file operations
641 static const struct v4l2_file_operations xvip_dma_fops = {
642 .owner = THIS_MODULE,
643 .unlocked_ioctl = video_ioctl2,
644 .open = v4l2_fh_open,
645 .release = vb2_fop_release,
646 .poll = vb2_fop_poll,
647 .mmap = vb2_fop_mmap,
650 /* -----------------------------------------------------------------------------
651 * Xilinx Video DMA Core
654 int xvip_dma_init(struct xvip_composite_device *xdev, struct xvip_dma *dma,
655 enum v4l2_buf_type type, unsigned int port)
662 mutex_init(&dma->lock);
663 mutex_init(&dma->pipe.lock);
664 INIT_LIST_HEAD(&dma->queued_bufs);
665 spin_lock_init(&dma->queued_lock);
667 dma->fmtinfo = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT);
668 dma->format.pixelformat = dma->fmtinfo->fourcc;
669 dma->format.colorspace = V4L2_COLORSPACE_SRGB;
670 dma->format.field = V4L2_FIELD_NONE;
671 dma->format.width = XVIP_DMA_DEF_WIDTH;
672 dma->format.height = XVIP_DMA_DEF_HEIGHT;
673 dma->format.bytesperline = dma->format.width * dma->fmtinfo->bpp;
674 dma->format.sizeimage = dma->format.bytesperline * dma->format.height;
676 /* Initialize the media entity... */
677 dma->pad.flags = type == V4L2_BUF_TYPE_VIDEO_CAPTURE
678 ? MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
680 ret = media_entity_init(&dma->video.entity, 1, &dma->pad, 0);
684 /* ... and the video node... */
685 dma->video.fops = &xvip_dma_fops;
686 dma->video.v4l2_dev = &xdev->v4l2_dev;
687 dma->video.queue = &dma->queue;
688 snprintf(dma->video.name, sizeof(dma->video.name), "%s %s %u",
689 xdev->dev->of_node->name,
690 type == V4L2_BUF_TYPE_VIDEO_CAPTURE ? "output" : "input",
692 dma->video.vfl_type = VFL_TYPE_GRABBER;
693 dma->video.vfl_dir = type == V4L2_BUF_TYPE_VIDEO_CAPTURE
694 ? VFL_DIR_RX : VFL_DIR_TX;
695 dma->video.release = video_device_release_empty;
696 dma->video.ioctl_ops = &xvip_dma_ioctl_ops;
697 dma->video.lock = &dma->lock;
699 video_set_drvdata(&dma->video, dma);
701 /* ... and the buffers queue... */
702 dma->alloc_ctx = vb2_dma_contig_init_ctx(dma->xdev->dev);
703 if (IS_ERR(dma->alloc_ctx)) {
704 ret = PTR_ERR(dma->alloc_ctx);
708 /* Don't enable VB2_READ and VB2_WRITE, as using the read() and write()
709 * V4L2 APIs would be inefficient. Testing on the command line with a
710 * 'cat /dev/video?' thus won't be possible, but given that the driver
711 * anyway requires a test tool to setup the pipeline before any video
712 * stream can be started, requiring a specific V4L2 test tool as well
713 * instead of 'cat' isn't really a drawback.
715 dma->queue.type = type;
716 dma->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
717 dma->queue.lock = &dma->lock;
718 dma->queue.drv_priv = dma;
719 dma->queue.buf_struct_size = sizeof(struct xvip_dma_buffer);
720 dma->queue.ops = &xvip_dma_queue_qops;
721 dma->queue.mem_ops = &vb2_dma_contig_memops;
722 dma->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC
723 | V4L2_BUF_FLAG_TSTAMP_SRC_EOF;
724 ret = vb2_queue_init(&dma->queue);
726 dev_err(dma->xdev->dev, "failed to initialize VB2 queue\n");
730 /* ... and the DMA channel. */
731 snprintf(name, sizeof(name), "port%u", port);
732 dma->dma = dma_request_slave_channel(dma->xdev->dev, name);
733 if (dma->dma == NULL) {
734 dev_err(dma->xdev->dev, "no VDMA channel found\n");
739 dma->align = 1 << dma->dma->device->copy_align;
741 ret = video_register_device(&dma->video, VFL_TYPE_GRABBER, -1);
743 dev_err(dma->xdev->dev, "failed to register video device\n");
750 xvip_dma_cleanup(dma);
754 void xvip_dma_cleanup(struct xvip_dma *dma)
756 if (video_is_registered(&dma->video))
757 video_unregister_device(&dma->video);
760 dma_release_channel(dma->dma);
762 if (!IS_ERR_OR_NULL(dma->alloc_ctx))
763 vb2_dma_contig_cleanup_ctx(dma->alloc_ctx);
765 media_entity_cleanup(&dma->video.entity);
767 mutex_destroy(&dma->lock);
768 mutex_destroy(&dma->pipe.lock);