Re: [PATCH] emu10k1: add per-voice PTR register dump to /proc entry

[Takashi Iwai <tiwai@suse.de>]

At Wed, 17 Nov 2004 12:51:29 -0500,
Lee Revell wrote:
> 
> On Wed, 2004-11-17 at 13:11 +0100, Takashi Iwai wrote:
> > At Sat, 13 Nov 2004 20:01:26 -0500,
> > Lee Revell wrote:
> > > 
> > > Summary: This patch adds a register dump for each voice to the /proc
> > > entry.  This functionality will be key for improving the voice allocator
> > > for multichannel support.  Currently these all go in the main file; I
> > > can split these into a file per voice if desired.
> > 
> > I feel it'd be better to create another proc file.  Not necessarily
> > per voice, though.  The dump seems not matching with the current
> > emu10k1 proc file contents.
> > 
> 
> Hey, it looks like if I write routines to dump all registers, then
> suspend/resume is halfway finished, right?
> 
> https://bugtrack.alsa-project.org/alsa-bug/view.php?id=227

Well, yes, halfway :)

We should call snd_pcm_suspend_all() to suspend the PCM streams, then
save the necessary registers, and stop the hardware.
In the resume, start the hardware, restore the registers, resume the
mixer (e.g. call snd_ac97_resume()).


Takashi


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