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media: v4l: common: v4l2_get_link_freq: add printing a warning
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>
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@ -469,6 +469,11 @@ s64 v4l2_get_link_freq(struct v4l2_ctrl_handler *handler, unsigned int mul,
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return -ENOENT;
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freq = div_u64(v4l2_ctrl_g_ctrl_int64(ctrl) * mul, div);
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pr_warn("%s: Link frequency estimated using pixel rate: result might be inaccurate\n",
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__func__);
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pr_warn("%s: Consider implementing support for V4L2_CID_LINK_FREQ in the transmitter driver\n",
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__func__);
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}
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return freq > 0 ? freq : -EINVAL;
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