[alsa-devel] Aureal issues on resume

[Takashi Iwai]

At Mon, 12 Sep 2011 09:53:28 +0200,
Takashi Iwai wrote:
> 
> At Sun, 04 Sep 2011 22:32:44 +0200,
> Clemens Ladisch wrote:
> > 
> > Raymond Yau wrote:
> > > The possible way is to save the contents of 128K memory mapped I/O
> > > ports before suspend to non-volatile memory and restore them after
> > > resume
> > >
> > > Is there any way for alsa driver to allocate non-volatile memory ?
> > 
> > 'Normal' memory is saved over suspend.  Just use {k|v}malloc.
> 
> If it's a 128kB bulk memory, vmalloc() is a more sensible choice.

BTW, in many cases, you don't have to save/restore the whole mmio
region.  Instead, stop the stream, save / restore some important
registers and do the similar procedure for the normal prepare callback
in the resume, and restart the stream again.


Takashi