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media: v4l: common: v4l2_get_link_freq: add printing a warning

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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>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Andrey Konovalov 2021-02-18 18:16:40 +01:00 committed by Mauro Carvalho Chehab
parent 937da4fd2c
commit 67012d97df
1 changed files with 5 additions and 0 deletions
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5
drivers/media/v4l2-core/v4l2-common.c
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@ -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__);
}
return freq > 0 ? freq : -EINVAL;