Re: [PATCHSET 22/25] add support for PC-9800 architecture (sound alsa)

[Takashi Iwai]

At Wed, 30 Oct 2002 02:43:22 +0900,
Osamu Tomita wrote:
> 
> Takashi Iwai wrote:
> > 
> > Hi,
> > 
> > the attached is a patch to create a new driver module,
> > snd-pc98-cs4232, which supports CS4232 on PC9800 and PC98II MPU
> > daughterboard.  (if you find the module name weird, please change as
> > you like.  the name is tentative :)
> > in this patch, almost all pc98-specific hardware initialization is
> > done in the card module, hence the changes to common modules become
> > minimum.
> (snip)
> > please check whether it works for you.  if it's ok, i'd like to merge
> > it into alsa cvs, so the changes will be sent as ALSA update patches
> > later.
> Thank you very much. I'm testing patch. And found some problems.
> sound/drivers/opl3/Makefile, sound/core/Makefile, sound/core/seq/Makefile
> and sound/core/seq/instr/Makefile needed additional patch for compile.

oops, yes, thanks.

> PCM works fine. But mpu401 plays very slow tempo. I can't find reason
> yet.

do you mean that the interrupts are generated too slowly?
you can measure how many UART interrupts are generated per second by
checking /proc/interrupts.
if it's too little, the problem is likely in the hardware
initialization part, which i simply copied from your patch.
but it could be a wrong copy & paste.
please check pc98_mpu401_init() in pc98.c.

btw, which MPU mode are you using, PC98II or normal MPU401?

Takashi