I don't think the line
pos -= pos % runtime->min_align;
updates the position buffer each time. You can see in posbuf-trace-01.txt that
runtime->min_align=1, so pos remains the same. I can find no place where posbuf
is updated, so I think the hardware does that. Before suspend, hardware and
software agree about their buffers, after suspend they don't, which may be a
result of your ***...*** marking in comment 12. But I still wonder why that
would have any impact, since the stream is reset, so the hardware should be
ready to accept new settings.
To verify this, I printed the lpib position (value of SD_LPIB register
for the stream) in azx_pcm_pointer(), in addition to azx_dev->posbuf
(see attachment). One can see that the lpib values are equal before and
after suspend, while the computed posbuf is wrong. This probabely means
that the hardware and software have a different idea about the dma
buffer.
** Attachment added: "posbuf-trace-02.txt"
http://launchpadlibrarian.net/8410140/posbuf-trace-02.txt
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snd-hda-intel: distorted sound after resume, until the module is reloaded
https://bugs.launchpad.net/bugs/100114
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