UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity
OpenCloudOS-Kernel/drivers/media/platform/xilinx/xilinx-dma.c

772 lines
21 KiB
C
Raw Blame History

/*
* Xilinx Video DMA
*
* Copyright (C) 2013-2015 Ideas on Board
* Copyright (C) 2013-2015 Xilinx, Inc.
*
* Contacts: Hyun Kwon <hyun.kwon@xilinx.com>
* Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/dma/xilinx_dma.h>
#include <linux/lcm.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-dma-contig.h>
#include "xilinx-dma.h"
#include "xilinx-vip.h"
#include "xilinx-vipp.h"
#define XVIP_DMA_DEF_FORMAT V4L2_PIX_FMT_YUYV
#define XVIP_DMA_DEF_WIDTH 1920
#define XVIP_DMA_DEF_HEIGHT 1080
/* Minimum and maximum widths are expressed in bytes */
#define XVIP_DMA_MIN_WIDTH 1U
#define XVIP_DMA_MAX_WIDTH 65535U
#define XVIP_DMA_MIN_HEIGHT 1U
#define XVIP_DMA_MAX_HEIGHT 8191U
/* -----------------------------------------------------------------------------
* Helper functions
*/
static struct v4l2_subdev *
xvip_dma_remote_subdev(struct media_pad *local, u32 *pad)
{
struct media_pad *remote;
remote = media_entity_remote_pad(local);
if (remote == NULL ||
media_entity_type(remote->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
return NULL;
if (pad)
*pad = remote->index;
return media_entity_to_v4l2_subdev(remote->entity);
}
static int xvip_dma_verify_format(struct xvip_dma *dma)
{
struct v4l2_subdev_format fmt;
struct v4l2_subdev *subdev;
int ret;
subdev = xvip_dma_remote_subdev(&dma->pad, &fmt.pad);
if (subdev == NULL)
return -EPIPE;
fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
if (ret < 0)
return ret == -ENOIOCTLCMD ? -EINVAL : ret;
if (dma->fmtinfo->code != fmt.format.code ||
dma->format.height != fmt.format.height ||
dma->format.width != fmt.format.width ||
dma->format.colorspace != fmt.format.colorspace)
return -EINVAL;
return 0;
}
/* -----------------------------------------------------------------------------
* Pipeline Stream Management
*/
/**
* xvip_pipeline_start_stop - Start ot stop streaming on a pipeline
* @pipe: The pipeline
* @start: Start (when true) or stop (when false) the pipeline
*
* Walk the entities chain starting at the pipeline output video node and start
* or stop all of them.
*
* Return: 0 if successful, or the return value of the failed video::s_stream
* operation otherwise.
*/
static int xvip_pipeline_start_stop(struct xvip_pipeline *pipe, bool start)
{
struct xvip_dma *dma = pipe->output;
struct media_entity *entity;
struct media_pad *pad;
struct v4l2_subdev *subdev;
int ret;
entity = &dma->video.entity;
while (1) {
pad = &entity->pads[0];
if (!(pad->flags & MEDIA_PAD_FL_SINK))
break;
pad = media_entity_remote_pad(pad);
if (pad == NULL ||
media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
break;
entity = pad->entity;
subdev = media_entity_to_v4l2_subdev(entity);
ret = v4l2_subdev_call(subdev, video, s_stream, start);
if (start && ret < 0 && ret != -ENOIOCTLCMD)
return ret;
}
return 0;
}
/**
* xvip_pipeline_set_stream - Enable/disable streaming on a pipeline
* @pipe: The pipeline
* @on: Turn the stream on when true or off when false
*
* The pipeline is shared between all DMA engines connect at its input and
* output. While the stream state of DMA engines can be controlled
* independently, pipelines have a shared stream state that enable or disable
* all entities in the pipeline. For this reason the pipeline uses a streaming
* counter that tracks the number of DMA engines that have requested the stream
* to be enabled.
*
* When called with the @on argument set to true, this function will increment
* the pipeline streaming count. If the streaming count reaches the number of
* DMA engines in the pipeline it will enable all entities that belong to the
* pipeline.
*
* Similarly, when called with the @on argument set to false, this function will
* decrement the pipeline streaming count and disable all entities in the
* pipeline when the streaming count reaches zero.
*
* Return: 0 if successful, or the return value of the failed video::s_stream
* operation otherwise. Stopping the pipeline never fails. The pipeline state is
* not updated when the operation fails.
*/
static int xvip_pipeline_set_stream(struct xvip_pipeline *pipe, bool on)
{
int ret = 0;
mutex_lock(&pipe->lock);
if (on) {
if (pipe->stream_count == pipe->num_dmas - 1) {
ret = xvip_pipeline_start_stop(pipe, true);
if (ret < 0)
goto done;
}
pipe->stream_count++;
} else {
if (--pipe->stream_count == 0)
xvip_pipeline_start_stop(pipe, false);
}
done:
mutex_unlock(&pipe->lock);
return ret;
}
static int xvip_pipeline_validate(struct xvip_pipeline *pipe,
struct xvip_dma *start)
{
struct media_entity_graph graph;
struct media_entity *entity = &start->video.entity;
struct media_device *mdev = entity->parent;
unsigned int num_inputs = 0;
unsigned int num_outputs = 0;
mutex_lock(&mdev->graph_mutex);
/* Walk the graph to locate the video nodes. */
media_entity_graph_walk_start(&graph, entity);
while ((entity = media_entity_graph_walk_next(&graph))) {
struct xvip_dma *dma;
if (entity->type != MEDIA_ENT_T_DEVNODE_V4L)
continue;
dma = to_xvip_dma(media_entity_to_video_device(entity));
if (dma->pad.flags & MEDIA_PAD_FL_SINK) {
pipe->output = dma;
num_outputs++;
} else {
num_inputs++;
}
}
mutex_unlock(&mdev->graph_mutex);
/* We need exactly one output and zero or one input. */
if (num_outputs != 1 || num_inputs > 1)
return -EPIPE;
pipe->num_dmas = num_inputs + num_outputs;
return 0;
}
static void __xvip_pipeline_cleanup(struct xvip_pipeline *pipe)
{
pipe->num_dmas = 0;
pipe->output = NULL;
}
/**
* xvip_pipeline_cleanup - Cleanup the pipeline after streaming
* @pipe: the pipeline
*
* Decrease the pipeline use count and clean it up if we were the last user.
*/
static void xvip_pipeline_cleanup(struct xvip_pipeline *pipe)
{
mutex_lock(&pipe->lock);
/* If we're the last user clean up the pipeline. */
if (--pipe->use_count == 0)
__xvip_pipeline_cleanup(pipe);
mutex_unlock(&pipe->lock);
}
/**
* xvip_pipeline_prepare - Prepare the pipeline for streaming
* @pipe: the pipeline
* @dma: DMA engine at one end of the pipeline
*
* Validate the pipeline if no user exists yet, otherwise just increase the use
* count.
*
* Return: 0 if successful or -EPIPE if the pipeline is not valid.
*/
static int xvip_pipeline_prepare(struct xvip_pipeline *pipe,
struct xvip_dma *dma)
{
int ret;
mutex_lock(&pipe->lock);
/* If we're the first user validate and initialize the pipeline. */
if (pipe->use_count == 0) {
ret = xvip_pipeline_validate(pipe, dma);
if (ret < 0) {
__xvip_pipeline_cleanup(pipe);
goto done;
}
}
pipe->use_count++;
ret = 0;
done:
mutex_unlock(&pipe->lock);
return ret;
}
/* -----------------------------------------------------------------------------
* videobuf2 queue operations
*/
/**
* struct xvip_dma_buffer - Video DMA buffer
* @buf: vb2 buffer base object
* @queue: buffer list entry in the DMA engine queued buffers list
* @dma: DMA channel that uses the buffer
*/
struct xvip_dma_buffer {
struct vb2_v4l2_buffer buf;
struct list_head queue;
struct xvip_dma *dma;
};
#define to_xvip_dma_buffer(vb) container_of(vb, struct xvip_dma_buffer, buf)
static void xvip_dma_complete(void *param)
{
struct xvip_dma_buffer *buf = param;
struct xvip_dma *dma = buf->dma;
spin_lock(&dma->queued_lock);
list_del(&buf->queue);
spin_unlock(&dma->queued_lock);
buf->buf.field = V4L2_FIELD_NONE;
buf->buf.sequence = dma->sequence++;
v4l2_get_timestamp(&buf->buf.timestamp);
vb2_set_plane_payload(&buf->buf.vb2_buf, 0, dma->format.sizeimage);
vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE);
}
static int
xvip_dma_queue_setup(struct vb2_queue *vq, const void *parg,
unsigned int *nbuffers, unsigned int *nplanes,
unsigned int sizes[], void *alloc_ctxs[])
{
const struct v4l2_format *fmt = parg;
struct xvip_dma *dma = vb2_get_drv_priv(vq);
/* Make sure the image size is large enough. */
if (fmt && fmt->fmt.pix.sizeimage < dma->format.sizeimage)
return -EINVAL;
*nplanes = 1;
sizes[0] = fmt ? fmt->fmt.pix.sizeimage : dma->format.sizeimage;
alloc_ctxs[0] = dma->alloc_ctx;
return 0;
}
static int xvip_dma_buffer_prepare(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue);
struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf);
buf->dma = dma;
return 0;
}
static void xvip_dma_buffer_queue(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue);
struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf);
struct dma_async_tx_descriptor *desc;
dma_addr_t addr = vb2_dma_contig_plane_dma_addr(vb, 0);
u32 flags;
if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
dma->xt.dir = DMA_DEV_TO_MEM;
dma->xt.src_sgl = false;
dma->xt.dst_sgl = true;
dma->xt.dst_start = addr;
} else {
flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
dma->xt.dir = DMA_MEM_TO_DEV;
dma->xt.src_sgl = true;
dma->xt.dst_sgl = false;
dma->xt.src_start = addr;
}
dma->xt.frame_size = 1;
dma->sgl[0].size = dma->format.width * dma->fmtinfo->bpp;
dma->sgl[0].icg = dma->format.bytesperline - dma->sgl[0].size;
dma->xt.numf = dma->format.height;
desc = dmaengine_prep_interleaved_dma(dma->dma, &dma->xt, flags);
if (!desc) {
dev_err(dma->xdev->dev, "Failed to prepare DMA transfer\n");
vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR);
return;
}
desc->callback = xvip_dma_complete;
desc->callback_param = buf;
spin_lock_irq(&dma->queued_lock);
list_add_tail(&buf->queue, &dma->queued_bufs);
spin_unlock_irq(&dma->queued_lock);
dmaengine_submit(desc);
if (vb2_is_streaming(&dma->queue))
dma_async_issue_pending(dma->dma);
}
static int xvip_dma_start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct xvip_dma *dma = vb2_get_drv_priv(vq);
struct xvip_dma_buffer *buf, *nbuf;
struct xvip_pipeline *pipe;
int ret;
dma->sequence = 0;
/*
* Start streaming on the pipeline. No link touching an entity in the
* pipeline can be activated or deactivated once streaming is started.
*
* Use the pipeline object embedded in the first DMA object that starts
* streaming.
*/
pipe = dma->video.entity.pipe
? to_xvip_pipeline(&dma->video.entity) : &dma->pipe;
ret = media_entity_pipeline_start(&dma->video.entity, &pipe->pipe);
if (ret < 0)
goto error;
/* Verify that the configured format matches the output of the
* connected subdev.
*/
ret = xvip_dma_verify_format(dma);
if (ret < 0)
goto error_stop;
ret = xvip_pipeline_prepare(pipe, dma);
if (ret < 0)
goto error_stop;
/* Start the DMA engine. This must be done before starting the blocks
* in the pipeline to avoid DMA synchronization issues.
*/
dma_async_issue_pending(dma->dma);
/* Start the pipeline. */
xvip_pipeline_set_stream(pipe, true);
return 0;
error_stop:
media_entity_pipeline_stop(&dma->video.entity);
error:
/* Give back all queued buffers to videobuf2. */
spin_lock_irq(&dma->queued_lock);
list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) {
vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_QUEUED);
list_del(&buf->queue);
}
spin_unlock_irq(&dma->queued_lock);
return ret;
}
static void xvip_dma_stop_streaming(struct vb2_queue *vq)
{
struct xvip_dma *dma = vb2_get_drv_priv(vq);
struct xvip_pipeline *pipe = to_xvip_pipeline(&dma->video.entity);
struct xvip_dma_buffer *buf, *nbuf;
/* Stop the pipeline. */
xvip_pipeline_set_stream(pipe, false);
/* Stop and reset the DMA engine. */
dmaengine_terminate_all(dma->dma);
/* Cleanup the pipeline and mark it as being stopped. */
xvip_pipeline_cleanup(pipe);
media_entity_pipeline_stop(&dma->video.entity);
/* Give back all queued buffers to videobuf2. */
spin_lock_irq(&dma->queued_lock);
list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) {
vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR);
list_del(&buf->queue);
}
spin_unlock_irq(&dma->queued_lock);
}
static struct vb2_ops xvip_dma_queue_qops = {
.queue_setup = xvip_dma_queue_setup,
.buf_prepare = xvip_dma_buffer_prepare,
.buf_queue = xvip_dma_buffer_queue,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
.start_streaming = xvip_dma_start_streaming,
.stop_streaming = xvip_dma_stop_streaming,
};
/* -----------------------------------------------------------------------------
* V4L2 ioctls
*/
static int
xvip_dma_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
{
struct v4l2_fh *vfh = file->private_data;
struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
| dma->xdev->v4l2_caps;
if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
else
cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
strlcpy(cap->driver, "xilinx-vipp", sizeof(cap->driver));
strlcpy(cap->card, dma->video.name, sizeof(cap->card));
snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s:%u",
dma->xdev->dev->of_node->name, dma->port);
return 0;
}
/* FIXME: without this callback function, some applications are not configured
* with correct formats, and it results in frames in wrong format. Whether this
* callback needs to be required is not clearly defined, so it should be
* clarified through the mailing list.
*/
static int
xvip_dma_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
{
struct v4l2_fh *vfh = file->private_data;
struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
if (f->index > 0)
return -EINVAL;
f->pixelformat = dma->format.pixelformat;
strlcpy(f->description, dma->fmtinfo->description,
sizeof(f->description));
return 0;
}
static int
xvip_dma_get_format(struct file *file, void *fh, struct v4l2_format *format)
{
struct v4l2_fh *vfh = file->private_data;
struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
format->fmt.pix = dma->format;
return 0;
}
static void
__xvip_dma_try_format(struct xvip_dma *dma, struct v4l2_pix_format *pix,
const struct xvip_video_format **fmtinfo)
{
const struct xvip_video_format *info;
unsigned int min_width;
unsigned int max_width;
unsigned int min_bpl;
unsigned int max_bpl;
unsigned int width;
unsigned int align;
unsigned int bpl;
/* Retrieve format information and select the default format if the
* requested format isn't supported.
*/
info = xvip_get_format_by_fourcc(pix->pixelformat);
if (IS_ERR(info))
info = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT);
pix->pixelformat = info->fourcc;
pix->field = V4L2_FIELD_NONE;
/* The transfer alignment requirements are expressed in bytes. Compute
* the minimum and maximum values, clamp the requested width and convert
* it back to pixels.
*/
align = lcm(dma->align, info->bpp);
min_width = roundup(XVIP_DMA_MIN_WIDTH, align);
max_width = rounddown(XVIP_DMA_MAX_WIDTH, align);
width = rounddown(pix->width * info->bpp, align);
pix->width = clamp(width, min_width, max_width) / info->bpp;
pix->height = clamp(pix->height, XVIP_DMA_MIN_HEIGHT,
XVIP_DMA_MAX_HEIGHT);
/* Clamp the requested bytes per line value. If the maximum bytes per
* line value is zero, the module doesn't support user configurable line
* sizes. Override the requested value with the minimum in that case.
*/
min_bpl = pix->width * info->bpp;
max_bpl = rounddown(XVIP_DMA_MAX_WIDTH, dma->align);
bpl = rounddown(pix->bytesperline, dma->align);
pix->bytesperline = clamp(bpl, min_bpl, max_bpl);
pix->sizeimage = pix->bytesperline * pix->height;
if (fmtinfo)
*fmtinfo = info;
}
static int
xvip_dma_try_format(struct file *file, void *fh, struct v4l2_format *format)
{
struct v4l2_fh *vfh = file->private_data;
struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
__xvip_dma_try_format(dma, &format->fmt.pix, NULL);
return 0;
}
static int
xvip_dma_set_format(struct file *file, void *fh, struct v4l2_format *format)
{
struct v4l2_fh *vfh = file->private_data;
struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
const struct xvip_video_format *info;
__xvip_dma_try_format(dma, &format->fmt.pix, &info);
if (vb2_is_busy(&dma->queue))
return -EBUSY;
dma->format = format->fmt.pix;
dma->fmtinfo = info;
return 0;
}
static const struct v4l2_ioctl_ops xvip_dma_ioctl_ops = {
.vidioc_querycap = xvip_dma_querycap,
.vidioc_enum_fmt_vid_cap = xvip_dma_enum_format,
.vidioc_g_fmt_vid_cap = xvip_dma_get_format,
.vidioc_g_fmt_vid_out = xvip_dma_get_format,
.vidioc_s_fmt_vid_cap = xvip_dma_set_format,
.vidioc_s_fmt_vid_out = xvip_dma_set_format,
.vidioc_try_fmt_vid_cap = xvip_dma_try_format,
.vidioc_try_fmt_vid_out = xvip_dma_try_format,
.vidioc_reqbufs = vb2_ioctl_reqbufs,
.vidioc_querybuf = vb2_ioctl_querybuf,
.vidioc_qbuf = vb2_ioctl_qbuf,
.vidioc_dqbuf = vb2_ioctl_dqbuf,
.vidioc_create_bufs = vb2_ioctl_create_bufs,
.vidioc_expbuf = vb2_ioctl_expbuf,
.vidioc_streamon = vb2_ioctl_streamon,
.vidioc_streamoff = vb2_ioctl_streamoff,
};
/* -----------------------------------------------------------------------------
* V4L2 file operations
*/
static const struct v4l2_file_operations xvip_dma_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = video_ioctl2,
.open = v4l2_fh_open,
.release = vb2_fop_release,
.poll = vb2_fop_poll,
.mmap = vb2_fop_mmap,
};
/* -----------------------------------------------------------------------------
* Xilinx Video DMA Core
*/
int xvip_dma_init(struct xvip_composite_device *xdev, struct xvip_dma *dma,
enum v4l2_buf_type type, unsigned int port)
{
char name[16];
int ret;
dma->xdev = xdev;
dma->port = port;
mutex_init(&dma->lock);
mutex_init(&dma->pipe.lock);
INIT_LIST_HEAD(&dma->queued_bufs);
spin_lock_init(&dma->queued_lock);
dma->fmtinfo = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT);
dma->format.pixelformat = dma->fmtinfo->fourcc;
dma->format.colorspace = V4L2_COLORSPACE_SRGB;
dma->format.field = V4L2_FIELD_NONE;
dma->format.width = XVIP_DMA_DEF_WIDTH;
dma->format.height = XVIP_DMA_DEF_HEIGHT;
dma->format.bytesperline = dma->format.width * dma->fmtinfo->bpp;
dma->format.sizeimage = dma->format.bytesperline * dma->format.height;
/* Initialize the media entity... */
dma->pad.flags = type == V4L2_BUF_TYPE_VIDEO_CAPTURE
? MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
ret = media_entity_init(&dma->video.entity, 1, &dma->pad, 0);
if (ret < 0)
goto error;
/* ... and the video node... */
dma->video.fops = &xvip_dma_fops;
dma->video.v4l2_dev = &xdev->v4l2_dev;
dma->video.queue = &dma->queue;
snprintf(dma->video.name, sizeof(dma->video.name), "%s %s %u",
xdev->dev->of_node->name,
type == V4L2_BUF_TYPE_VIDEO_CAPTURE ? "output" : "input",
port);
dma->video.vfl_type = VFL_TYPE_GRABBER;
dma->video.vfl_dir = type == V4L2_BUF_TYPE_VIDEO_CAPTURE
? VFL_DIR_RX : VFL_DIR_TX;
dma->video.release = video_device_release_empty;
dma->video.ioctl_ops = &xvip_dma_ioctl_ops;
dma->video.lock = &dma->lock;
video_set_drvdata(&dma->video, dma);
/* ... and the buffers queue... */
dma->alloc_ctx = vb2_dma_contig_init_ctx(dma->xdev->dev);
if (IS_ERR(dma->alloc_ctx)) {
ret = PTR_ERR(dma->alloc_ctx);
goto error;
}
/* Don't enable VB2_READ and VB2_WRITE, as using the read() and write()
* V4L2 APIs would be inefficient. Testing on the command line with a
* 'cat /dev/video?' thus won't be possible, but given that the driver
* anyway requires a test tool to setup the pipeline before any video
* stream can be started, requiring a specific V4L2 test tool as well
* instead of 'cat' isn't really a drawback.
*/
dma->queue.type = type;
dma->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
dma->queue.lock = &dma->lock;
dma->queue.drv_priv = dma;
dma->queue.buf_struct_size = sizeof(struct xvip_dma_buffer);
dma->queue.ops = &xvip_dma_queue_qops;
dma->queue.mem_ops = &vb2_dma_contig_memops;
dma->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC
| V4L2_BUF_FLAG_TSTAMP_SRC_EOF;
ret = vb2_queue_init(&dma->queue);
if (ret < 0) {
dev_err(dma->xdev->dev, "failed to initialize VB2 queue\n");
goto error;
}
/* ... and the DMA channel. */
snprintf(name, sizeof(name), "port%u", port);
dma->dma = dma_request_slave_channel(dma->xdev->dev, name);
if (dma->dma == NULL) {
dev_err(dma->xdev->dev, "no VDMA channel found\n");
ret = -ENODEV;
goto error;
}
dma->align = 1 << dma->dma->device->copy_align;
ret = video_register_device(&dma->video, VFL_TYPE_GRABBER, -1);
if (ret < 0) {
dev_err(dma->xdev->dev, "failed to register video device\n");
goto error;
}
return 0;
error:
xvip_dma_cleanup(dma);
return ret;
}
void xvip_dma_cleanup(struct xvip_dma *dma)
{
if (video_is_registered(&dma->video))
video_unregister_device(&dma->video);
if (dma->dma)
dma_release_channel(dma->dma);
if (!IS_ERR_OR_NULL(dma->alloc_ctx))
vb2_dma_contig_cleanup_ctx(dma->alloc_ctx);
media_entity_cleanup(&dma->video.entity);
mutex_destroy(&dma->lock);
mutex_destroy(&dma->pipe.lock);
}
Reference in New Issue View Git Blame Copy Permalink