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SubjectRe: [PATCH v2.1 1/3] v4l: common: v4l2_get_link_freq: add printing a warning
Hi Andrey,

Thank you for the patch.

On Thu, Feb 18, 2021 at 08:16:40PM +0300, Andrey Konovalov wrote:
> Print a warning if V4L2_CID_LINK_FREQ control is not implemented.
>
> Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org>
> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
> drivers/media/v4l2-core/v4l2-common.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
> index 133d20e40f82..04af03285a20 100644
> --- a/drivers/media/v4l2-core/v4l2-common.c
> +++ b/drivers/media/v4l2-core/v4l2-common.c
> @@ -469,6 +469,11 @@ s64 v4l2_get_link_freq(struct v4l2_ctrl_handler *handler, unsigned int mul,
> return -ENOENT;
>
> freq = div_u64(v4l2_ctrl_g_ctrl_int64(ctrl) * mul, div);
> +
> + pr_warn("%s: Link frequency estimated using pixel rate: result might be inaccurate\n",
> + __func__);
> + pr_warn("%s: Consider implementing support for V4L2_CID_LINK_FREQ in the transmitter driver\n",
> + __func__);

It would still be nice if v4l2_ctrl_handler was extended with a struct
device pointer to use dev_warn() here, and allow replacing "the
transmitter driver" with the driver name.

> }
>
> return freq > 0 ? freq : -EINVAL;

--
Regards,

Laurent Pinchart

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