Re: snapper does not work on PowerBook5,6

[Michael <macallan%netbsd.org@localhost>]

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Hello,

On Oct 16, 2010, at 4:20 PM, Frank Wille wrote:

> Michael wrote:
>
> > That looks right, my iBook uses the same:
> > interrupts    0000001e 00000001 00000001 00000000 00000002 00000000
>
> Do you see irq 1 listed in vmstat -i when playing audio?

No time to check right now, I'll do it later on.

> > You may want to sprinkle some printf()s over arch/powerpc/pic/
> > pic_openpic.c and friends to verify that the right interrupts are
> > being enabled, aren't blocked elsewhere, are the right type ( as in
> > edge vs. level triggered ) etc.
>
> Looks fine. Here is an interrupt list of my system:
>
> irq1  edg  snapper0
> irq2  edg  snapper0
> irq22 edg  zsc0 ch0
> irq23 edg  zsc0 ch1
> irq24 lev  wdc0
> irq29 lev  ochi1
> irq39 lev  wdc1
> irq40 lev  fwohci0
> irq41 lev  gem0
> irq47 lev  pmu0
> irq52 lev  bwi0
> irq53 lev  cbb0
> irq61 edg  snapper0
> irq63 lev  ochi2, ohci3, ehci0

Umm, what does snapper's interrupts property look like on your  
machine? The DMA and the status change interrupt are different types  
on mine.

> Maybe there is no interrupt problem, but a DMA problem? I found the  
> location
> where the freeze happens: It is an infinite loop in dbdma_stop(),  
> while
> waiting for two status flags to indicate DMA is flushed and stopped.
>
> But since dbdma is also used for wdc0 I'm not sure what can be wrong  
> here.

This is getting weirder and weirder.

> > > > > Looking at the OF tree I should use the "name" or "compatible"
> > > > > property for
> > > > > "audio-gpio" and "reg" for "AAPL,address". But the contents of  
> > > > > "reg"
> > > > > is not
> > > > > the final address and has probably to be added to some base
> > > > > address of
> > > > > obio?
> > > >
> > > > It /should/ be relative to obio/gpio although sometimes it's  
> > > > relative
> > > > to obio.
>
> Ok. I modified snapper.c to find the gpios in my PowerBook as well.  
> I also
> added some code not to use gpios when they were not found. ;)
>
> Now I can plug in a headphone and an interrupt is caused. This works  
> fine.
> But audio DMA still doesn't.

Try to force the DMA interrupts to be level triggered.

have fun
Michael

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