[pulseaudio-tickets] [Bug 84585] Issue of CPU usage with HiFiBerry driver snd_soc_hifiberry_amp with Debian Wheezy kernel 3.12.28

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84585

--- Comment #40 from Raymond <superquad.vortex2 at gmail.com> ---
refer to datasheet, there is a 64 * 32 bits FIFO between APB interface and
Serialiser (I2S)

this mean data first write must not less than fifo size (start threshold must
also greater than the dma brust size) before call snd_pcm_start()

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