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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Issue of CPU usage with HiFiBerry driver snd_soc_hifiberry_amp with Debian Wheezy kernel 3.12.28"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84585#c14">Comment # 14</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Issue of CPU usage with HiFiBerry driver snd_soc_hifiberry_amp with Debian Wheezy kernel 3.12.28"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84585">bug 84585</a>
from <span class="vcard"><a class="email" href="mailto:info@hifiberry.com" title="HiFiBerry <info@hifiberry.com>"> <span class="fn">HiFiBerry</span></a>
</span></b>
<pre>@Raymond: No idea about DMA residue. As far as I know, the Raspberry Pi I2S
driver directly access the DMA controller. The code for this can be found here:
<a href="https://github.com/raspberrypi/linux/blob/rpi-3.12.y/sound/soc/bcm/bcm2708-i2s.c">https://github.com/raspberrypi/linux/blob/rpi-3.12.y/sound/soc/bcm/bcm2708-i2s.c</a>
It seems, that there was some work on the DMA driver itself:
<a href="https://github.com/raspberrypi/linux/blob/rpi-3.12.y/arch/arm/mach-bcm2708/dma.c">https://github.com/raspberrypi/linux/blob/rpi-3.12.y/arch/arm/mach-bcm2708/dma.c</a>
Best regards
Daniel</pre>
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