Re: [PATCH v9 19/28] rcar-vin: use different v4l2 operations in media controller mode

Laurent Pinchart
2017-12-08T10:13:48Z

Hi Niklas,

Thank you for the patch.

On Friday, 8 December 2017 03:08:33 EET Niklas Söderlund wrote:
> When the driver runs in media controller mode it should not directly
> control the subdevice instead userspace will be responsible for
> configuring the pipeline. To be able to run in this mode a different set
> of v4l2 operations needs to be used.
>
> Add a new set of v4l2 operations to support the running without directly

Maybe s/the running/operation/ ?

> interacting with the source subdevice.
>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
> ---
> drivers/media/platform/rcar-vin/rcar-dma.c | 3 +-
> drivers/media/platform/rcar-vin/rcar-v4l2.c | 155 ++++++++++++++++++++++++-
> drivers/media/platform/rcar-vin/rcar-vin.h | 1 +
> 3 files changed, 155 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c
> b/drivers/media/platform/rcar-vin/rcar-dma.c index
> d2788d8bb9565aaa..6c5df13b30d6dd14 100644
> --- a/drivers/media/platform/rcar-vin/rcar-dma.c
> +++ b/drivers/media/platform/rcar-vin/rcar-dma.c
> @@ -628,7 +628,8 @@ static int rvin_setup(struct rvin_dev *vin)
> /* Default to TB */
> vnmc = VNMC_IM_FULL;
> /* Use BT if video standard can be read and is 60 Hz format */
> - if (!v4l2_subdev_call(vin_to_source(vin), video, g_std, &std)) {
> + if (!vin->info->use_mc &&
> + !v4l2_subdev_call(vin_to_source(vin), video, g_std, &std)) {
> if (std & V4L2_STD_525_60)
> vnmc = VNMC_IM_FULL | VNMC_FOC;
> }

I think the subdev should be queried in rcar-v4l2.c and the information cached
in the rvin_dev structure instead of queried here. Interactions with the
subdev should be minimized in rvin-dma.c. You can fix this in a separate patch
if you prefer.

> diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c
> b/drivers/media/platform/rcar-vin/rcar-v4l2.c index
> 0ffbf0c16fb7b00e..5fea2856fd61030f 100644
> --- a/drivers/media/platform/rcar-vin/rcar-v4l2.c
> +++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> @@ -23,6 +23,9 @@
> #include "rcar-vin.h"
>
> #define RVIN_DEFAULT_FORMAT V4L2_PIX_FMT_YUYV
> +#define RVIN_DEFAULT_WIDTH 800
> +#define RVIN_DEFAULT_HEIGHT 600
> +#define RVIN_DEFAULT_COLORSPACE V4L2_COLORSPACE_SRGB
>
> /* ------------------------------------------------------------------------
> * Format Conversions
> @@ -671,6 +674,84 @@ static const struct v4l2_ioctl_ops rvin_ioctl_ops = {
> .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> };
>
> +/* ------------------------------------------------------------------------
> + * V4L2 Media Controller
> + */
> +
> +static int __rvin_mc_try_format(struct rvin_dev *vin,
> + struct v4l2_pix_format *pix)
> +{
> + /* Keep current field if no specific one is asked for */
> + if (pix->field == V4L2_FIELD_ANY)
> + pix->field = vin->format.field;

You should set a default value instead, trying a format should return the same
result regardless of the current state of the device.

> + return rvin_format_align(vin, pix);
> +}
> +
> +static int rvin_mc_try_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> +
> + return __rvin_mc_try_format(vin, &f->fmt.pix);
> +}
> +
> +static int rvin_mc_s_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> + int ret;
> +
> + if (vb2_is_busy(&vin->queue))
> + return -EBUSY;
> +
> + ret = __rvin_mc_try_format(vin, &f->fmt.pix);
> + if (ret)
> + return ret;
> +
> + vin->format = f->fmt.pix;
> +
> + return 0;
> +}
> +
> +static int rvin_mc_enum_input(struct file *file, void *priv,
> + struct v4l2_input *i)
> +{
> + if (i->index != 0)
> + return -EINVAL;
> +
> + i->type = V4L2_INPUT_TYPE_CAMERA;
> + strlcpy(i->name, "Camera", sizeof(i->name));
> +
> + return 0;
> +}
> +
> +static const struct v4l2_ioctl_ops rvin_mc_ioctl_ops = {
> + .vidioc_querycap = rvin_querycap,
> + .vidioc_try_fmt_vid_cap = rvin_mc_try_fmt_vid_cap,
> + .vidioc_g_fmt_vid_cap = rvin_g_fmt_vid_cap,
> + .vidioc_s_fmt_vid_cap = rvin_mc_s_fmt_vid_cap,
> + .vidioc_enum_fmt_vid_cap = rvin_enum_fmt_vid_cap,
> +
> + .vidioc_enum_input = rvin_mc_enum_input,
> + .vidioc_g_input = rvin_g_input,
> + .vidioc_s_input = rvin_s_input,

The input API makes no sense for MC-based devices.

> + .vidioc_reqbufs = vb2_ioctl_reqbufs,
> + .vidioc_create_bufs = vb2_ioctl_create_bufs,
> + .vidioc_querybuf = vb2_ioctl_querybuf,
> + .vidioc_qbuf = vb2_ioctl_qbuf,
> + .vidioc_dqbuf = vb2_ioctl_dqbuf,
> + .vidioc_expbuf = vb2_ioctl_expbuf,
> + .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
> + .vidioc_streamon = vb2_ioctl_streamon,
> + .vidioc_streamoff = vb2_ioctl_streamoff,
> +
> + .vidioc_log_status = v4l2_ctrl_log_status,
> + .vidioc_subscribe_event = rvin_subscribe_event,
> + .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> +};
> +
> /* ------------------------------------------------------------------------
> * File Operations
> */
> @@ -814,6 +895,60 @@ static const struct v4l2_file_operations rvin_fops = {
> .read = vb2_fop_read,
> };
>
> +/* ------------------------------------------------------------------------
> + * Media controller file Operations

I'm personally fine with capitalizing all words in a title, or only the first
one, but I don't see a reason to capitalize the first and last only :-)

> + */
> +
> +static int rvin_mc_open(struct file *file)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> + int ret;
> +
> + mutex_lock(&vin->lock);
> +
> + file->private_data = vin;
> +
> + ret = v4l2_fh_open(file);
> + if (ret)
> + goto unlock;
> +
> + pm_runtime_get_sync(vin->dev);

Can't this function return an error ?

> + v4l2_pipeline_pm_use(&vin->vdev.entity, 1);
> +
> +unlock:
> + mutex_unlock(&vin->lock);
> +
> + return ret;
> +}
> +
> +static int rvin_mc_release(struct file *file)
> +{
> + struct rvin_dev *vin = video_drvdata(file);
> + int ret;
> +
> + mutex_lock(&vin->lock);
> +
> + /* the release helper will cleanup any on-going streaming */
> + ret = _vb2_fop_release(file, NULL);
> +
> + v4l2_pipeline_pm_use(&vin->vdev.entity, 0);
> + pm_runtime_put(vin->dev);
> +
> + mutex_unlock(&vin->lock);
> +
> + return ret;
> +}
> +
> +static const struct v4l2_file_operations rvin_mc_fops = {
> + .owner = THIS_MODULE,
> + .unlocked_ioctl = video_ioctl2,
> + .open = rvin_mc_open,
> + .release = rvin_mc_release,
> + .poll = vb2_fop_poll,
> + .mmap = vb2_fop_mmap,
> + .read = vb2_fop_read,
> +};
> +
> void rvin_v4l2_unregister(struct rvin_dev *vin)
> {
> if (!video_is_registered(&vin->vdev))
> @@ -849,19 +984,33 @@ int rvin_v4l2_register(struct rvin_dev *vin)
> vin->v4l2_dev.notify = rvin_notify;
>
> /* video node */
> - vdev->fops = &rvin_fops;
> vdev->v4l2_dev = &vin->v4l2_dev;
> vdev->queue = &vin->queue;
> snprintf(vdev->name, sizeof(vdev->name), "%s %s", KBUILD_MODNAME,
> dev_name(vin->dev));
> vdev->release = video_device_release_empty;
> - vdev->ioctl_ops = &rvin_ioctl_ops;
> vdev->lock = &vin->lock;
> vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
> V4L2_CAP_READWRITE;
>
> + /* Set some form of default format */

"Some form of" ? :-)

> vin->format.pixelformat = RVIN_DEFAULT_FORMAT;
> - rvin_reset_format(vin);
> + vin->format.width = RVIN_DEFAULT_WIDTH;
> + vin->format.height = RVIN_DEFAULT_HEIGHT;
> + vin->format.colorspace = RVIN_DEFAULT_COLORSPACE;
> +
> + if (vin->info->use_mc) {
> + vdev->fops = &rvin_mc_fops;
> + vdev->ioctl_ops = &rvin_mc_ioctl_ops;
> + } else {
> + vdev->fops = &rvin_fops;
> + vdev->ioctl_ops = &rvin_ioctl_ops;
> + rvin_reset_format(vin);
> + }
> +
> + ret = rvin_format_align(vin, &vin->format);
> + if (ret)
> + return ret;
>
> ret = video_register_device(&vin->vdev, VFL_TYPE_GRABBER, -1);
> if (ret) {
> diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h
> b/drivers/media/platform/rcar-vin/rcar-vin.h index
> 0747873c2b9cb74c..fd3cd781be0ab1cf 100644
> --- a/drivers/media/platform/rcar-vin/rcar-vin.h
> +++ b/drivers/media/platform/rcar-vin/rcar-vin.h
> @@ -21,6 +21,7 @@
> #include <media/v4l2-ctrls.h>
> #include <media/v4l2-dev.h>
> #include <media/v4l2-device.h>
> +#include <media/v4l2-mc.h>

Can't you include this header in the .c files instead ? Minimizing the headers
included by other headers lowers (pre)compilation time.

> #include <media/videobuf2-v4l2.h>
>
> /* Number of HW buffers */

--
Regards,

Laurent Pinchart