Re: [PATCH v9 4/4] [media] cxusb: add raw mode support for Medion MD95700

From: Hans Verkuil
Date: Fri Apr 12 2019 - 05:27:39 EST

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On 3/30/19 12:51 AM, Maciej S. Szmigiero wrote:
> This adds raw (unprocessed) BT.656 stream capturing support for the analog
> part of Medion 95700.
> It can be enabled by setting CXUSB_EXTENDEDMODE_CAPTURE_RAW flag in
> parm.capture.extendedmode passed to VIDIOC_S_PARM.

What is the point of this feature? I think this should just be dropped.

Regards,

Hans

>
> Signed-off-by: Maciej S. Szmigiero <mail@xxxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/media/usb/dvb-usb/cxusb-analog.c | 190 +++++++++++++++++++----
> drivers/media/usb/dvb-usb/cxusb.h | 4 +
> drivers/media/v4l2-core/v4l2-ioctl.c | 3 +-
> 3 files changed, 163 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/media/usb/dvb-usb/cxusb-analog.c b/drivers/media/usb/dvb-usb/cxusb-analog.c
> index c726e578b5da..f8dcb8240d5c 100644
> --- a/drivers/media/usb/dvb-usb/cxusb-analog.c
> +++ b/drivers/media/usb/dvb-usb/cxusb-analog.c
> @@ -44,7 +44,9 @@ static int cxusb_medion_v_queue_setup(struct vb2_queue *q,
> {
> struct dvb_usb_device *dvbdev = vb2_get_drv_priv(q);
> struct cxusb_medion_dev *cxdev = dvbdev->priv;
> - unsigned int size = cxdev->width * cxdev->height * 2;
> + unsigned int size = cxdev->raw_mode ?
> + CXUSB_VIDEO_MAX_FRAME_SIZE :
> + cxdev->width * cxdev->height * 2;
>
> if (*num_planes > 0) {
> if (*num_planes != 1)
> @@ -67,8 +69,13 @@ static int cxusb_medion_v_buf_init(struct vb2_buffer *vb)
>
> cxusb_vprintk(dvbdev, OPS, "buffer init\n");
>
> - if (vb2_plane_size(vb, 0) < cxdev->width * cxdev->height * 2)
> - return -ENOMEM;
> + if (cxdev->raw_mode) {
> + if (vb2_plane_size(vb, 0) < CXUSB_VIDEO_MAX_FRAME_SIZE)
> + return -ENOMEM;
> + } else {
> + if (vb2_plane_size(vb, 0) < cxdev->width * cxdev->height * 2)
> + return -ENOMEM;
> + }
>
> cxusb_vprintk(dvbdev, OPS, "buffer OK\n");
>
> @@ -442,6 +449,45 @@ static bool cxusb_medion_copy_field(struct dvb_usb_device *dvbdev,
> return true;
> }
>
> +static void cxusb_medion_v_process_urb_raw(struct cxusb_medion_dev *cxdev,
> + struct urb *urb)
> +{
> + struct dvb_usb_device *dvbdev = cxdev->dvbdev;
> + u8 *buf;
> + struct cxusb_medion_vbuffer *vbuf;
> + int i;
> + unsigned long len;
> +
> + if (list_empty(&cxdev->buflist)) {
> + dev_warn(&dvbdev->udev->dev, "no free buffers\n");
> + cxdev->vbuf_sequence++;
> + return;
> + }
> +
> + vbuf = list_first_entry(&cxdev->buflist, struct cxusb_medion_vbuffer,
> + list);
> + list_del(&vbuf->list);
> +
> + vbuf->vb2.field = V4L2_FIELD_NONE;

This isn't right. It should likely be FIELD_INTERLACED, since that's what the
cx25840 (and most other SDTV video receivers) gives you.

> + vbuf->vb2.sequence = cxdev->vbuf_sequence++;
> + vbuf->vb2.vb2_buf.timestamp = ktime_get_ns();
> +
> + buf = vb2_plane_vaddr(&vbuf->vb2.vb2_buf, 0);
> +
> + for (i = 0, len = 0; i < urb->number_of_packets; i++) {
> + memcpy(buf, urb->transfer_buffer +
> + urb->iso_frame_desc[i].offset,
> + urb->iso_frame_desc[i].actual_length);
> +
> + buf += urb->iso_frame_desc[i].actual_length;
> + len += urb->iso_frame_desc[i].actual_length;
> + }
> +
> + vb2_set_plane_payload(&vbuf->vb2.vb2_buf, 0, len);
> +
> + vb2_buffer_done(&vbuf->vb2.vb2_buf, VB2_BUF_STATE_DONE);
> +}
> +
> static bool cxusb_medion_v_process_auxbuf(struct cxusb_medion_dev *cxdev,
> bool reset)
> {
> @@ -566,22 +612,26 @@ static bool cxusb_medion_v_complete_handle_urb(struct cxusb_medion_dev *cxdev,
> len);
>
> if (len > 0) {
> - cxusb_vprintk(dvbdev, URB, "appending URB\n");
> -
> - /*
> - * append new data to auxbuf while
> - * overwriting old data if necessary
> - *
> - * if any overwrite happens then we can no
> - * longer rely on consistency of the whole
> - * data so let's start again the current
> - * auxbuf frame assembling process from
> - * the beginning
> - */
> - *auxbuf_reset =
> - !cxusb_auxbuf_append_urb(dvbdev,
> - &cxdev->auxbuf,
> - urb);
> + if (cxdev->raw_mode)
> + cxusb_medion_v_process_urb_raw(cxdev, urb);
> + else {
> + cxusb_vprintk(dvbdev, URB, "appending URB\n");
> +
> + /*
> + * append new data to auxbuf while
> + * overwriting old data if necessary
> + *
> + * if any overwrite happens then we can no
> + * longer rely on consistency of the whole
> + * data so let's start again the current
> + * auxbuf frame assembling process from
> + * the beginning
> + */
> + *auxbuf_reset =
> + !cxusb_auxbuf_append_urb(dvbdev,
> + &cxdev->auxbuf,
> + urb);
> + }
> }
> }
>
> @@ -616,7 +666,8 @@ static void cxusb_medion_v_complete_work(struct work_struct *work)
>
> reschedule = cxusb_medion_v_complete_handle_urb(cxdev, &auxbuf_reset);
>
> - if (cxusb_medion_v_process_auxbuf(cxdev, auxbuf_reset))
> + if (!cxdev->raw_mode && cxusb_medion_v_process_auxbuf(cxdev,
> + auxbuf_reset))
> /* reschedule us until auxbuf no longer can produce any frame */
> reschedule = true;
>
> @@ -755,9 +806,13 @@ static int cxusb_medion_v_start_streaming(struct vb2_queue *q,
> goto ret_unstream_cx;
> }
>
> - ret = cxusb_medion_v_ss_auxbuf_alloc(cxdev, &npackets);
> - if (ret != 0)
> - goto ret_unstream_md;
> + if (cxdev->raw_mode)
> + npackets = CXUSB_VIDEO_MAX_FRAME_PKTS;
> + else {
> + ret = cxusb_medion_v_ss_auxbuf_alloc(cxdev, &npackets);
> + if (ret != 0)
> + goto ret_unstream_md;
> + }
>
> for (i = 0; i < CXUSB_VIDEO_URBS; i++) {
> int framen;
> @@ -813,9 +868,11 @@ static int cxusb_medion_v_start_streaming(struct vb2_queue *q,
> cxdev->nexturb = 0;
> cxdev->vbuf_sequence = 0;
>
> - cxdev->vbuf = NULL;
> - cxdev->bt656.mode = NEW_FRAME;
> - cxdev->bt656.buf = NULL;
> + if (!cxdev->raw_mode) {
> + cxdev->vbuf = NULL;
> + cxdev->bt656.mode = NEW_FRAME;
> + cxdev->bt656.buf = NULL;
> + }
>
> for (i = 0; i < CXUSB_VIDEO_URBS; i++)
> if (cxdev->streamurbs[i] != NULL) {
> @@ -833,7 +890,8 @@ static int cxusb_medion_v_start_streaming(struct vb2_queue *q,
> cxusb_medion_urbs_free(cxdev);
>
> ret_freeab:
> - vfree(cxdev->auxbuf.buf);
> + if (!cxdev->raw_mode)
> + vfree(cxdev->auxbuf.buf);
>
> ret_unstream_md:
> cxusb_ctrl_msg(dvbdev, CMD_STREAMING_OFF, NULL, 0, NULL, 0);
> @@ -880,7 +938,8 @@ static void cxusb_medion_v_stop_streaming(struct vb2_queue *q)
> mutex_lock(cxdev->videodev->lock);
>
> /* free transfer buffer and URB */
> - vfree(cxdev->auxbuf.buf);
> + if (!cxdev->raw_mode)
> + vfree(cxdev->auxbuf.buf);
>
> cxusb_medion_urbs_free(cxdev);
>
> @@ -953,9 +1012,11 @@ static int cxusb_medion_g_fmt_vid_cap(struct file *file, void *fh,
> f->fmt.pix.height = cxdev->height;
> f->fmt.pix.pixelformat = V4L2_PIX_FMT_UYVY;
> f->fmt.pix.field = V4L2_FIELD_SEQ_TB;
> - f->fmt.pix.bytesperline = cxdev->width * 2;
> + f->fmt.pix.bytesperline = cxdev->raw_mode ? 0 : cxdev->width * 2;
> f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
> - f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * f->fmt.pix.height;
> + f->fmt.pix.sizeimage =
> + cxdev->raw_mode ? CXUSB_VIDEO_MAX_FRAME_SIZE :
> + f->fmt.pix.bytesperline * f->fmt.pix.height;
> f->fmt.pix.priv = 0;
>
> return 0;
> @@ -1010,8 +1071,10 @@ static int cxusb_medion_try_s_fmt_vid_cap(struct file *file,
> f->fmt.pix.height = subfmt.format.height;
> f->fmt.pix.pixelformat = V4L2_PIX_FMT_UYVY;
> f->fmt.pix.field = V4L2_FIELD_SEQ_TB;
> - f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
> - f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * f->fmt.pix.height;
> + f->fmt.pix.bytesperline = cxdev->raw_mode ? 0 : f->fmt.pix.width * 2;
> + f->fmt.pix.sizeimage =
> + cxdev->raw_mode ? CXUSB_VIDEO_MAX_FRAME_SIZE :
> + f->fmt.pix.bytesperline * f->fmt.pix.height;
> f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
> f->fmt.pix.priv = 0;
>
> @@ -1340,6 +1403,67 @@ static int cxusb_medion_s_std(struct file *file, void *fh,
> return 0;
> }
>
> +static int cxusb_medion_g_s_parm(struct file *file, void *fh,
> + struct v4l2_streamparm *param)
> +{
> + v4l2_std_id std;
> +
> + if (param->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> +
> + param->parm.capture.readbuffers = 2;
> +
> + if (cxusb_medion_g_std(file, fh, &std) == 0)
> + v4l2_video_std_frame_period(std,
> + &param->parm.capture.timeperframe);
> +
> + return 0;
> +}
> +
> +static int cxusb_medion_g_parm(struct file *file, void *fh,
> + struct v4l2_streamparm *param)
> +{
> + struct dvb_usb_device *dvbdev = video_drvdata(file);
> + struct cxusb_medion_dev *cxdev = dvbdev->priv;
> + int ret;
> +
> + ret = cxusb_medion_g_s_parm(file, fh, param);
> + if (ret != 0)
> + return ret;
> +
> + if (cxdev->raw_mode)
> + param->parm.capture.extendedmode |=
> + CXUSB_EXTENDEDMODE_CAPTURE_RAW;
> +
> + return 0;
> +}
> +
> +static int cxusb_medion_s_parm(struct file *file, void *fh,
> + struct v4l2_streamparm *param)
> +{
> + struct dvb_usb_device *dvbdev = video_drvdata(file);
> + struct cxusb_medion_dev *cxdev = dvbdev->priv;
> + int ret;
> + bool want_raw;
> +
> + ret = cxusb_medion_g_s_parm(file, fh, param);
> + if (ret != 0)
> + return ret;
> +
> + want_raw = param->parm.capture.extendedmode &
> + CXUSB_EXTENDEDMODE_CAPTURE_RAW;
> +
> + if (want_raw != cxdev->raw_mode) {
> + if (vb2_start_streaming_called(&cxdev->videoqueue) ||
> + cxdev->stop_streaming)
> + return -EBUSY;
> +
> + cxdev->raw_mode = want_raw;
> + }
> +
> + return 0;
> +}
> +
> static int cxusb_medion_log_status(struct file *file, void *fh)
> {
> struct dvb_usb_device *dvbdev = video_drvdata(file);
> @@ -1359,6 +1483,8 @@ static const struct v4l2_ioctl_ops cxusb_video_ioctl = {
> .vidioc_enum_input = cxusb_medion_enum_input,
> .vidioc_g_input = cxusb_medion_g_input,
> .vidioc_s_input = cxusb_medion_s_input,
> + .vidioc_g_parm = cxusb_medion_g_parm,
> + .vidioc_s_parm = cxusb_medion_s_parm,
> .vidioc_g_tuner = cxusb_medion_g_tuner,
> .vidioc_s_tuner = cxusb_medion_s_tuner,
> .vidioc_g_frequency = cxusb_medion_g_frequency,
> diff --git a/drivers/media/usb/dvb-usb/cxusb.h b/drivers/media/usb/dvb-usb/cxusb.h
> index edd7e873e619..e08c946f7c35 100644
> --- a/drivers/media/usb/dvb-usb/cxusb.h
> +++ b/drivers/media/usb/dvb-usb/cxusb.h
> @@ -130,6 +130,7 @@ struct cxusb_medion_dev {
> u32 input;
> bool stop_streaming;
> u32 width, height;
> + bool raw_mode;
> struct cxusb_medion_auxbuf auxbuf;
> v4l2_std_id norm;
>
> @@ -153,6 +154,9 @@ struct cxusb_medion_vbuffer {
> struct list_head list;
> };
>
> +/* Capture streaming parameters extendedmode field flags */
> +#define CXUSB_EXTENDEDMODE_CAPTURE_RAW 1
> +
> /* defines for "debug" module parameter */
> #define CXUSB_DBG_RC BIT(0)
> #define CXUSB_DBG_I2C BIT(1)
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index ac87c3e37280..0b9ca5acdd35 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -2023,7 +2023,7 @@ static int v4l_s_parm(const struct v4l2_ioctl_ops *ops,
> if (ret)
> return ret;
>
> - /* Note: extendedmode is never used in drivers */
> + /* Note: extendedmode is never used in output drivers */
> if (V4L2_TYPE_IS_OUTPUT(p->type)) {
> memset(p->parm.output.reserved, 0,
> sizeof(p->parm.output.reserved));
> @@ -2032,7 +2032,6 @@ static int v4l_s_parm(const struct v4l2_ioctl_ops *ops,
> } else {
> memset(p->parm.capture.reserved, 0,
> sizeof(p->parm.capture.reserved));
> - p->parm.capture.extendedmode = 0;
> p->parm.capture.capturemode &= V4L2_MODE_HIGHQUALITY;
> }
> return ops->vidioc_s_parm(file, fh, p);
>

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Next in thread: Maciej S. Szmigiero: "Re: [PATCH v9 4/4] [media] cxusb: add raw mode support for Medion MD95700"
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