[alsa-devel] maximum tolerable sampling frequency difference for a driver

Let's say that the driver cannot set the exact sampling frequency asked via hwparms but something near (because of the granularity of the result of the clock division). What is the maximum difference that should be accepted (in Hz or in %)? I guess that there are 2 factors playing a role:

1) if the frequency is too different then the upper layers report a undeflow/overflow

2) the sound just doesn't sound good (just a bit too presto or too adagio)

So what difference should be accepted instead of returning -EINVAL?

Thanks,