On 02/19/18 17:59, Jacopo Mondi wrote:
> Add driver for Renesas Capture Engine Unit (CEU).
>
> The CEU interface supports capturing 'data' (YUV422) and 'images'
> (NV[12|21|16|61]).
>
> This driver aims to replace the soc_camera-based sh_mobile_ceu one.
>
> Tested with ov7670 camera sensor, providing YUYV_2X8 data on Renesas RZ
> platform GR-Peach.
>
> Tested with ov7725 camera sensor on SH4 platform Migo-R.
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
> drivers/media/platform/Kconfig | 9 +
> drivers/media/platform/Makefile | 1 +
> drivers/media/platform/renesas-ceu.c | 1661 ++++++++++++++++++++++++++++++++++
> 3 files changed, 1671 insertions(+)
> create mode 100644 drivers/media/platform/renesas-ceu.c
>
<snip>
> +static int ceu_s_input(struct file *file, void *priv, unsigned int i)
> +{
> + struct ceu_device *ceudev = video_drvdata(file);
> + struct ceu_subdev *ceu_sd_old;
> + int ret;
> +
> + if (i >= ceudev->num_sd)
> + return -EINVAL;
> +
> + if (vb2_is_streaming(&ceudev->vb2_vq))
> + return -EBUSY;
> +
> + if (i == ceudev->sd_index)
> + return 0;
> +
> + ceu_sd_old = ceudev->sd;
> + ceudev->sd = &ceudev->subdevs[i];
> +
> + /* Make sure we can generate output image formats. */
> + ret = ceu_init_formats(ceudev);
Why is this done for every s_input? I would expect that this is done only once
for each subdev.
I also expect to see a ceu_set_default_fmt() call here. Or that the v4l2_pix is kept
in ceu_subdev (i.e. per subdev) instead of a single fmt in cuedev. I think I prefer
that over configuring a new default format every time you switch inputs.
This code will work for two subdevs with exactly the same formats/properties. But
switching between e.g. a sensor and a video receiver will leave things in an
inconsistent state as far as I can see.
E.g. if input 1 is the video receiver then switching to that input and running
'v4l2-ctl -V' will show the sensor format, not the video receiver format.
> + if (ret) {
> + ceudev->sd = ceu_sd_old;
> + return -EINVAL;
> + }
> +
> + /* now that we're sure we can use the sensor, power off the old one. */
> + v4l2_subdev_call(ceu_sd_old->v4l2_sd, core, s_power, 0);
> + v4l2_subdev_call(ceudev->sd->v4l2_sd, core, s_power, 1);
> +
> + ceudev->sd_index = i;
> +
> + return 0;
> +}
The remainder of this driver looks good.
Regards,
Hans
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