Re: [PATCH v4 2/2] media: platform: Add Aspeed Video Engine driver

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On 10/19/2018 03:26 PM, Eddie James wrote:


On 10/12/2018 07:22 AM, Hans Verkuil wrote:
On 10/05/2018 09:57 PM, Eddie James wrote:
The Video Engine (VE) embedded in the Aspeed AST2400 and AST2500 SOCs
can capture and compress video data from digital or analog sources. With the Aspeed chip acting a service processor, the Video Engine can capture
the host processor graphics output.

Add a V4L2 driver to capture video data and compress it to JPEG images.
Make the video frames available through the V4L2 streaming interface.

Signed-off-by: Eddie James <eajames@xxxxxxxxxxxxx>
---
  MAINTAINERS                           |    8 +
  drivers/media/platform/Kconfig        |    8 +
  drivers/media/platform/Makefile       |    1 +
  drivers/media/platform/aspeed-video.c | 1674 +++++++++++++++++++++++++++++++++
  4 files changed, 1691 insertions(+)
  create mode 100644 drivers/media/platform/aspeed-video.c

<snip>

+static int aspeed_video_enum_input(struct file *file, void *fh,
+                   struct v4l2_input *inp)
+{
+    if (inp->index)
+        return -EINVAL;
+
+    strscpy(inp->name, "Host VGA capture", sizeof(inp->name));
+    inp->type = V4L2_INPUT_TYPE_CAMERA;
+    inp->capabilities = V4L2_IN_CAP_DV_TIMINGS;
+    inp->status = V4L2_IN_ST_NO_SIGNAL | V4L2_IN_ST_NO_SYNC;
This can't be right. If there is a valid signal, then status should be 0.
And ideally you can tell the difference between no signal and no sync
as well.

+
+    return 0;
+}
+
+static int aspeed_video_get_input(struct file *file, void *fh, unsigned int *i)
+{
+    *i = 0;
+
+    return 0;
+}
+
+static int aspeed_video_set_input(struct file *file, void *fh, unsigned int i)
+{
+    if (i)
+        return -EINVAL;
+
+    return 0;
+}
+
+static int aspeed_video_get_parm(struct file *file, void *fh,
+                 struct v4l2_streamparm *a)
+{
+    struct aspeed_video *video = video_drvdata(file);
+
+    a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
+    a->parm.capture.readbuffers = 3;
+    a->parm.capture.timeperframe.numerator = 1;
+    if (!video->frame_rate)
+        a->parm.capture.timeperframe.denominator = MAX_FRAME_RATE + 1;
+    else
+        a->parm.capture.timeperframe.denominator = video->frame_rate;
+
+    return 0;
+}
+
+static int aspeed_video_set_parm(struct file *file, void *fh,
+                 struct v4l2_streamparm *a)
+{
+    unsigned int frame_rate = 0;
+    struct aspeed_video *video = video_drvdata(file);
+
+    a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
+    a->parm.capture.readbuffers = 3;
+
+    if (a->parm.capture.timeperframe.numerator)
+        frame_rate = a->parm.capture.timeperframe.denominator /
+            a->parm.capture.timeperframe.numerator;
+
+    if (!frame_rate || frame_rate > MAX_FRAME_RATE) {
+        frame_rate = 0;
+
+        /*
+         * Set to max + 1 to differentiate between max and 0, which
+         * means "don't care".
But what does "don't care" mean in practice? It's still not clear to me how this
is supposed to work.

+         */
+        a->parm.capture.timeperframe.denominator = MAX_FRAME_RATE + 1;
And regardless of anything else this timeperframe is out of the range that
aspeed_video_enum_frameintervals() returns.

+ a->parm.capture.timeperframe.numerator = 1;
+    }
+
+    if (video->frame_rate != frame_rate) {
+        video->frame_rate = frame_rate;
+        aspeed_video_update(video, VE_CTRL, VE_CTRL_FRC,
+                    FIELD_PREP(VE_CTRL_FRC, frame_rate));
+    }
+
+    return 0;
+}
+
+static int aspeed_video_enum_framesizes(struct file *file, void *fh,
+                    struct v4l2_frmsizeenum *fsize)
+{
+    struct aspeed_video *video = video_drvdata(file);
+
+    if (fsize->index)
+        return -EINVAL;
+
+    if (fsize->pixel_format != V4L2_PIX_FMT_JPEG)
+        return -EINVAL;
+
+    fsize->discrete.width = video->pix_fmt.width;
+    fsize->discrete.height = video->pix_fmt.height;
+    fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
+
+    return 0;
+}
+
+static int aspeed_video_enum_frameintervals(struct file *file, void *fh,
+                        struct v4l2_frmivalenum *fival)
+{
+    struct aspeed_video *video = video_drvdata(file);
+
+    if (fival->index)
+        return -EINVAL;
+
+    if (fival->width != video->width || fival->height != video->height)
+        return -EINVAL;
+
+    if (fival->pixel_format != V4L2_PIX_FMT_JPEG)
+        return -EINVAL;
+
+    fival->type = V4L2_FRMIVAL_TYPE_CONTINUOUS;
+
+    fival->stepwise.min.denominator = MAX_FRAME_RATE;
+    fival->stepwise.min.numerator = 1;
+    fival->stepwise.max.denominator = 1;
+    fival->stepwise.max.numerator = 1;
+    fival->stepwise.step = fival->stepwise.max;
+
+    return 0;
+}
+
+static int aspeed_video_set_dv_timings(struct file *file, void *fh,
+                       struct v4l2_dv_timings *timings)
+{
+    struct aspeed_video *video = video_drvdata(file);
+
If vb2_is_busy() returns true, then return -EBUSY here. It is not allowed to
set the timings while vb2 is busy.

Buffer ioctls (Input 0):
        fail: v4l2-test-buffers.cpp(344): node->s_dv_timings(timings)
        fail: v4l2-test-buffers.cpp(452): testCanSetSameTimings(node)
    test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: FAIL

Streaming ioctls:
    test read/write: OK
    test blocking wait: OK
        fail: v4l2-test-buffers.cpp(344): node->s_dv_timings(timings)
        fail: v4l2-test-buffers.cpp(637): testCanSetSameTimings(node)
        fail: v4l2-test-buffers.cpp(952): captureBufs(node, q, m2m_q, frame_count, false)
    test MMAP: FAIL

Built from v4l-utils c36dbbdfa8b30b2badd4f893b59d0bd4f0bd12aa

Adding this causes some of the v4l2-compliance streaming tests to fail, and prevents my own application from being able to call S_DV_TIMINGS after detecting a resolution change, despite calling streamoff and unmapping all the buffers first.

Any thoughts on this Hans?

Thanks,
Eddie


Thanks,
Eddie


+    if (video->width != timings->bt.width ||
+        video->height != timings->bt.height)
+        return -EINVAL;
+
+    video->pix_fmt.width = timings->bt.width;
+    video->pix_fmt.height = timings->bt.height;
+    video->pix_fmt.sizeimage = video->max_compressed_size;
+    video->timings.width = timings->bt.width;
+    video->timings.height = timings->bt.height;
+
+    timings->type = V4L2_DV_BT_656_1120;
+
+    return 0;
+}
+
+static int aspeed_video_get_dv_timings(struct file *file, void *fh,
+                       struct v4l2_dv_timings *timings)
+{
+    struct aspeed_video *video = video_drvdata(file);
+
+    timings->type = V4L2_DV_BT_656_1120;
+    timings->bt = video->timings;
+
+    return 0;
+}
+
+static int aspeed_video_query_dv_timings(struct file *file, void *fh,
+                     struct v4l2_dv_timings *timings)
+{
+    int rc;
+    struct aspeed_video *video = video_drvdata(file);
+
+    if (file->f_flags & O_NONBLOCK) {
+        if (test_bit(VIDEO_RES_CHANGE, &video->flags))
+            return -EAGAIN;
+    } else {
+        rc = wait_event_interruptible(video->wait,
+                          !test_bit(VIDEO_RES_CHANGE,
+                            &video->flags));
+        if (rc)
+            return -EINTR;
+    }
+
+    timings->type = V4L2_DV_BT_656_1120;
+    timings->bt = video->timings;
+    timings->bt.width = video->width;
+    timings->bt.height = video->height;
+
+    return 0;
+}
+
+static int aspeed_video_enum_dv_timings(struct file *file, void *fh,
+                    struct v4l2_enum_dv_timings *timings)
+{
+    if (timings->index)
+        return -EINVAL;
+
+    return aspeed_video_get_dv_timings(file, fh, &timings->timings);
+}
+
+static int aspeed_video_dv_timings_cap(struct file *file, void *fh,
+                       struct v4l2_dv_timings_cap *cap)
+{
+    struct aspeed_video *video = video_drvdata(file);
+
+    cap->type = V4L2_DV_BT_656_1120;
+    cap->bt.capabilities = V4L2_DV_BT_CAP_PROGRESSIVE;
+    cap->bt.min_width = video->width;
+    cap->bt.max_width = video->width;
+    cap->bt.min_height = video->height;
+    cap->bt.max_height = video->height;
This should return the capabilities of the aspeed. In this case I'd
guess that the max width/height is 1920x1080 (or perhaps 1200).

The minimum is probably the VGA resolution.

+
+    return 0;
+}
+
+static int aspeed_video_sub_event(struct v4l2_fh *fh,
+                  const struct v4l2_event_subscription *sub)
+{
+    switch (sub->type) {
+    case V4L2_EVENT_SOURCE_CHANGE:
+        return v4l2_src_change_event_subscribe(fh, sub);
+    }
+
+    return v4l2_ctrl_subscribe_event(fh, sub);
+}
+
+static const struct v4l2_ioctl_ops aspeed_video_ioctl_ops = {
+    .vidioc_querycap = aspeed_video_querycap,
+
+    .vidioc_enum_fmt_vid_cap = aspeed_video_enum_format,
+    .vidioc_g_fmt_vid_cap = aspeed_video_get_format,
+    .vidioc_s_fmt_vid_cap = aspeed_video_get_format,
+    .vidioc_try_fmt_vid_cap = aspeed_video_get_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_prepare_buf = vb2_ioctl_prepare_buf,
+    .vidioc_streamon = vb2_ioctl_streamon,
+    .vidioc_streamoff = vb2_ioctl_streamoff,
+
+    .vidioc_enum_input = aspeed_video_enum_input,
+    .vidioc_g_input = aspeed_video_get_input,
+    .vidioc_s_input = aspeed_video_set_input,
+
+    .vidioc_g_parm = aspeed_video_get_parm,
+    .vidioc_s_parm = aspeed_video_set_parm,
+    .vidioc_enum_framesizes = aspeed_video_enum_framesizes,
+    .vidioc_enum_frameintervals = aspeed_video_enum_frameintervals,
+
+    .vidioc_s_dv_timings = aspeed_video_set_dv_timings,
+    .vidioc_g_dv_timings = aspeed_video_get_dv_timings,
+    .vidioc_query_dv_timings = aspeed_video_query_dv_timings,
+    .vidioc_enum_dv_timings = aspeed_video_enum_dv_timings,
+    .vidioc_dv_timings_cap = aspeed_video_dv_timings_cap,
+
+    .vidioc_subscribe_event = aspeed_video_sub_event,
+    .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+};
+
+static void aspeed_video_update_jpeg_quality(struct aspeed_video *video)
+{
+    u32 comp_ctrl = FIELD_PREP(VE_COMP_CTRL_DCT_LUM, video->jpeg_quality) |
+        FIELD_PREP(VE_COMP_CTRL_DCT_CHR, video->jpeg_quality | 0x10);
+
+    aspeed_video_update(video, VE_COMP_CTRL,
+                VE_COMP_CTRL_DCT_LUM | VE_COMP_CTRL_DCT_CHR,
+                comp_ctrl);
+}
+
+static void aspeed_video_update_subsampling(struct aspeed_video *video)
+{
+    if (video->jpeg.virt)
+        aspeed_video_init_jpeg_table(video->jpeg.virt, video->yuv420);
+
+    if (video->yuv420)
+        aspeed_video_update(video, VE_SEQ_CTRL, 0, VE_SEQ_CTRL_YUV420);
+    else
+        aspeed_video_update(video, VE_SEQ_CTRL, VE_SEQ_CTRL_YUV420, 0);
+}
+
+static int aspeed_video_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+    struct aspeed_video *video = container_of(ctrl->handler,
+                          struct aspeed_video,
+                          ctrl_handler);
+
+    switch (ctrl->id) {
+    case V4L2_CID_JPEG_COMPRESSION_QUALITY:
+        video->jpeg_quality = ctrl->val;
+        aspeed_video_update_jpeg_quality(video);
+        break;
+    case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
+        if (ctrl->val == V4L2_JPEG_CHROMA_SUBSAMPLING_420) {
+            video->yuv420 = true;
+            aspeed_video_update_subsampling(video);
+        } else {
+            video->yuv420 = false;
+            aspeed_video_update_subsampling(video);
+        }
+        break;
+    default:
+        return -EINVAL;
+    }
+
+    return 0;
+}
+
+static const struct v4l2_ctrl_ops aspeed_video_ctrl_ops = {
+    .s_ctrl = aspeed_video_set_ctrl,
+};
+
+static void aspeed_video_resolution_work(struct work_struct *work)
+{
+    int rc;
+    struct delayed_work *dwork = to_delayed_work(work);
+    struct aspeed_video *video = container_of(dwork, struct aspeed_video,
+                          res_work);
+
+    /* No clients remaining after delay */
+    if (atomic_read(&video->clients) == 0)
+        goto done;
+
+    aspeed_video_on(video);
+
+    aspeed_video_init_regs(video);
+
+    rc = aspeed_video_get_resolution(video);
+    if (rc)
+        dev_err(video->dev,
+            "resolution changed; couldn't get new resolution\n");
+    else if (test_bit(VIDEO_STREAMING, &video->flags))
+        aspeed_video_start_frame(video);
+
+    if (video->width != video->pix_fmt.width ||
+        video->height != video->pix_fmt.height) {
+        static const struct v4l2_event ev = {
+            .type = V4L2_EVENT_SOURCE_CHANGE,
+            .u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION,
+        };
+
+        v4l2_event_queue(&video->vdev, &ev);
+    }
+
+done:
+    clear_bit(VIDEO_RES_CHANGE, &video->flags);
+    wake_up_interruptible_all(&video->wait);
+}
+
+static int aspeed_video_open(struct file *file)
+{
+    int rc;
+    struct aspeed_video *video = video_drvdata(file);
+
+    mutex_lock(&video->video_lock);
+
+    if (atomic_inc_return(&video->clients) == 1) {
+        rc = aspeed_video_start(video);
+        if (rc) {
+            dev_err(video->dev, "Failed to start video engine\n");
+            atomic_dec(&video->clients);
+            mutex_unlock(&video->video_lock);
+            return rc;
+        }
+    }
+
+    mutex_unlock(&video->video_lock);
+
+    return v4l2_fh_open(file);
+}
+
+static int aspeed_video_release(struct file *file)
+{
+    int rc;
+    struct aspeed_video *video = video_drvdata(file);
+
+    rc = vb2_fop_release(file);
+
+    mutex_lock(&video->video_lock);
+
+    if (atomic_dec_return(&video->clients) == 0)
+        aspeed_video_stop(video);
+
+    mutex_unlock(&video->video_lock);
+
+    return rc;
+}
+
+static const struct v4l2_file_operations aspeed_video_v4l2_fops = {
+    .owner = THIS_MODULE,
+    .read = vb2_fop_read,
+    .poll = vb2_fop_poll,
+    .unlocked_ioctl = video_ioctl2,
+    .mmap = vb2_fop_mmap,
+    .open = aspeed_video_open,
+    .release = aspeed_video_release,
+};
+
+static int aspeed_video_queue_setup(struct vb2_queue *q,
+                    unsigned int *num_buffers,
+                    unsigned int *num_planes,
+                    unsigned int sizes[],
+                    struct device *alloc_devs[])
+{
+    struct aspeed_video *video = vb2_get_drv_priv(q);
+
+    if (*num_planes) {
+        if (sizes[0] < video->max_compressed_size)
+            return -EINVAL;
+
+        return 0;
+    }
+
+    *num_planes = 1;
+    sizes[0] = video->max_compressed_size;
+
+    return 0;
+}
+
+static int aspeed_video_buf_prepare(struct vb2_buffer *vb)
+{
+    struct aspeed_video *video = vb2_get_drv_priv(vb->vb2_queue);
+
+    if (vb2_plane_size(vb, 0) < video->max_compressed_size)
+        return -EINVAL;
+
+    return 0;
+}
+
+static int aspeed_video_start_streaming(struct vb2_queue *q,
+                    unsigned int count)
+{
+    int rc;
+    struct aspeed_video *video = vb2_get_drv_priv(q);
+
+    rc = aspeed_video_start_frame(video);
+    if (rc) {
+        aspeed_video_bufs_done(video, VB2_BUF_STATE_QUEUED);
+        return rc;
+    }
+
+    video->sequence = 0;
+    set_bit(VIDEO_STREAMING, &video->flags);
+    return 0;
+}
+
+static void aspeed_video_stop_streaming(struct vb2_queue *q)
+{
+    int rc;
+    struct aspeed_video *video = vb2_get_drv_priv(q);
+
+    clear_bit(VIDEO_STREAMING, &video->flags);
+
+    rc = wait_event_timeout(video->wait,
+                !test_bit(VIDEO_FRAME_INPRG, &video->flags),
+                STOP_TIMEOUT);
+    if (!rc) {
+        dev_err(video->dev, "Timed out when stopping streaming\n");
+        aspeed_video_stop(video);
+    }
+
+    aspeed_video_bufs_done(video, VB2_BUF_STATE_ERROR);
+}
+
+static void aspeed_video_buf_queue(struct vb2_buffer *vb)
+{
+    struct aspeed_video *video = vb2_get_drv_priv(vb->vb2_queue);
+    struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+    struct aspeed_video_buffer *avb = to_aspeed_video_buffer(vbuf);
+    unsigned long flags;
+
+    spin_lock_irqsave(&video->lock, flags);
+    list_add_tail(&avb->link, &video->buffers);
+    spin_unlock_irqrestore(&video->lock, flags);
+}
+
+static const struct vb2_ops aspeed_video_vb2_ops = {
+    .queue_setup = aspeed_video_queue_setup,
+    .wait_prepare = vb2_ops_wait_prepare,
+    .wait_finish = vb2_ops_wait_finish,
+    .buf_prepare = aspeed_video_buf_prepare,
+    .start_streaming = aspeed_video_start_streaming,
+    .stop_streaming = aspeed_video_stop_streaming,
+    .buf_queue =  aspeed_video_buf_queue,
+};
+
+static int aspeed_video_setup_video(struct aspeed_video *video)
+{
+    const u64 mask = ~(BIT(V4L2_JPEG_CHROMA_SUBSAMPLING_444) |
+               BIT(V4L2_JPEG_CHROMA_SUBSAMPLING_420));
+    struct v4l2_device *v4l2_dev = &video->v4l2_dev;
+    struct vb2_queue *vbq = &video->queue;
+    struct video_device *vdev = &video->vdev;
+    int rc;
+
+    video->pix_fmt.pixelformat = V4L2_PIX_FMT_JPEG;
+    video->pix_fmt.field = V4L2_FIELD_NONE;
+    video->pix_fmt.colorspace = V4L2_COLORSPACE_SRGB;
+    video->pix_fmt.quantization = V4L2_QUANTIZATION_FULL_RANGE;
+
+    rc = v4l2_device_register(video->dev, v4l2_dev);
+    if (rc) {
+        dev_err(video->dev, "Failed to register v4l2 device\n");
+        return rc;
+    }
+
+    v4l2_ctrl_handler_init(&video->ctrl_handler, 2);
+    v4l2_ctrl_new_std(&video->ctrl_handler, &aspeed_video_ctrl_ops,
+              V4L2_CID_JPEG_COMPRESSION_QUALITY, 0,
+              ASPEED_VIDEO_JPEG_NUM_QUALITIES - 1, 1, 0);
+    v4l2_ctrl_new_std_menu(&video->ctrl_handler, &aspeed_video_ctrl_ops,
+                   V4L2_CID_JPEG_CHROMA_SUBSAMPLING,
+                   V4L2_JPEG_CHROMA_SUBSAMPLING_420, mask,
+                   V4L2_JPEG_CHROMA_SUBSAMPLING_444);
+
+    if (video->ctrl_handler.error) {
+        v4l2_ctrl_handler_free(&video->ctrl_handler);
+        v4l2_device_unregister(v4l2_dev);
+
+        dev_err(video->dev, "Failed to init controls: %d\n",
+            video->ctrl_handler.error);
+        return rc;
+    }
+
+    v4l2_dev->ctrl_handler = &video->ctrl_handler;
+
+    vbq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+    vbq->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
+    vbq->dev = v4l2_dev->dev;
+    vbq->lock = &video->video_lock;
+    vbq->ops = &aspeed_video_vb2_ops;
+    vbq->mem_ops = &vb2_dma_contig_memops;
+    vbq->drv_priv = video;
+    vbq->buf_struct_size = sizeof(struct aspeed_video_buffer);
+    vbq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+    vbq->min_buffers_needed = 3;
+
+    rc = vb2_queue_init(vbq);
+    if (rc) {
+        v4l2_ctrl_handler_free(&video->ctrl_handler);
+        v4l2_device_unregister(v4l2_dev);
+
+        dev_err(video->dev, "Failed to init vb2 queue\n");
+        return rc;
+    }
+
+    vdev->queue = vbq;
+    vdev->fops = &aspeed_video_v4l2_fops;
+    vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
READWRITE doesn't work for JPEG since there is no clear end of a frame. Just drop
this and the read op in aspeed_video_v4l2_fops.

+        V4L2_CAP_STREAMING;
+    vdev->v4l2_dev = v4l2_dev;
+    strscpy(vdev->name, DEVICE_NAME, sizeof(vdev->name));
+    vdev->vfl_type = VFL_TYPE_GRABBER;
+    vdev->vfl_dir = VFL_DIR_RX;
+    vdev->release = video_device_release_empty;
+    vdev->ioctl_ops = &aspeed_video_ioctl_ops;
+    vdev->lock = &video->video_lock;
+
+    video_set_drvdata(vdev, video);
+    rc = video_register_device(vdev, VFL_TYPE_GRABBER, 0);
+    if (rc) {
+        vb2_queue_release(vbq);
+        v4l2_ctrl_handler_free(&video->ctrl_handler);
+        v4l2_device_unregister(v4l2_dev);
+
+        dev_err(video->dev, "Failed to register video device\n");
+        return rc;
+    }
+
+    return 0;
+}
+
+static int aspeed_video_init(struct aspeed_video *video)
+{
+    int irq;
+    int rc;
+    struct device *dev = video->dev;
+
+    irq = irq_of_parse_and_map(dev->of_node, 0);
+    if (!irq) {
+        dev_err(dev, "Unable to find IRQ\n");
+        return -ENODEV;
+    }
+
+    rc = devm_request_irq(dev, irq, aspeed_video_irq, IRQF_SHARED,
+                  DEVICE_NAME, video);
+    if (rc < 0) {
+        dev_err(dev, "Unable to request IRQ %d\n", irq);
+        return rc;
+    }
+
+    video->eclk = devm_clk_get(dev, "eclk");
+    if (IS_ERR(video->eclk)) {
+        dev_err(dev, "Unable to get ECLK\n");
+        return PTR_ERR(video->eclk);
+    }
+
+    video->vclk = devm_clk_get(dev, "vclk");
+    if (IS_ERR(video->vclk)) {
+        dev_err(dev, "Unable to get VCLK\n");
+        return PTR_ERR(video->vclk);
+    }
+
+    video->rst = devm_reset_control_get_exclusive(dev, NULL);
+    if (IS_ERR(video->rst)) {
+        dev_err(dev, "Unable to get VE reset\n");
+        return PTR_ERR(video->rst);
+    }
+
+    rc = of_reserved_mem_device_init(dev);
+    if (rc) {
+        dev_err(dev, "Unable to reserve memory\n");
+        return rc;
+    }
+
+    rc = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+    if (rc) {
+        dev_err(dev, "Failed to set DMA mask\n");
+        of_reserved_mem_device_release(dev);
+        return rc;
+    }
+
+    if (!aspeed_video_alloc_buf(video, &video->jpeg,
+                    VE_JPEG_HEADER_SIZE)) {
+        dev_err(dev, "Failed to allocate DMA for JPEG header\n");
+        of_reserved_mem_device_release(dev);
+        return rc;
+    }
+
+    aspeed_video_init_jpeg_table(video->jpeg.virt, video->yuv420);
+
+    return 0;
+}
+
+static int aspeed_video_probe(struct platform_device *pdev)
+{
+    int rc;
+    struct resource *res;
+    struct aspeed_video *video = kzalloc(sizeof(*video), GFP_KERNEL);
+
+    if (!video)
+        return -ENOMEM;
+
+    video->frame_rate = 30;
+    video->dev = &pdev->dev;
+    mutex_init(&video->video_lock);
+    init_waitqueue_head(&video->wait);
+    INIT_DELAYED_WORK(&video->res_work, aspeed_video_resolution_work);
+    INIT_LIST_HEAD(&video->buffers);
+
+    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+    video->base = devm_ioremap_resource(video->dev, res);
+
+    if (IS_ERR(video->base))
+        return PTR_ERR(video->base);
+
+    rc = aspeed_video_init(video);
+    if (rc)
+        return rc;
+
+    rc = aspeed_video_setup_video(video);
+    if (rc)
+        return rc;
+
+    return 0;
+}
+
+static int aspeed_video_remove(struct platform_device *pdev)
+{
+    struct device *dev = &pdev->dev;
+    struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
+    struct aspeed_video *video = to_aspeed_video(v4l2_dev);
+
+    video_unregister_device(&video->vdev);
+
+    vb2_queue_release(&video->queue);
+
+    v4l2_ctrl_handler_free(&video->ctrl_handler);
+
+    v4l2_device_unregister(v4l2_dev);
+
+    dma_free_coherent(video->dev, VE_JPEG_HEADER_SIZE, video->jpeg.virt,
+              video->jpeg.dma);
+
+    of_reserved_mem_device_release(dev);
+
+    return 0;
+}
+
+static const struct of_device_id aspeed_video_of_match[] = {
+    { .compatible = "aspeed,ast2400-video-engine" },
+    { .compatible = "aspeed,ast2500-video-engine" },
+    {}
+};
+MODULE_DEVICE_TABLE(of, aspeed_video_of_match);
+
+static struct platform_driver aspeed_video_driver = {
+    .driver = {
+        .name = DEVICE_NAME,
+        .of_match_table = aspeed_video_of_match,
+    },
+    .probe = aspeed_video_probe,
+    .remove = aspeed_video_remove,
+};
+
+module_platform_driver(aspeed_video_driver);
+
+MODULE_DESCRIPTION("ASPEED Video Engine Driver");
+MODULE_AUTHOR("Eddie James");
+MODULE_LICENSE("GPL v2");

Regards,

    Hans






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