Re: ali5451.c: M5451 info needed

[Takashi Iwai <tiwai@suse.de>]

At Sun, 22 May 2005 03:19:53 +0300,
Sasha Khapyorsky wrote:
> 
> Hi,
> 
> I'm trying now to add MC97 modem support for ALi M5451 (ali5451.c driver).
> There is preliminary patch attached (not for inclusion yet: at least
> big clean up is needed). I don't have device data sheets and patch was
> based on existed audio code.
> 
> Basically it works in both directions playback and capture. But dma is
> configured so that interrupt is generated at middle of buffer regardless to
> period_size value. Same story with audio capture.
> 
> Anybody know how to config M5451 dma so that it will be able to work
> with multiple blocks and generate interrupts at period_size (if possible)?
> And/or may point me to data sheet or at least M5451 dma related info?

I don't know of the datasheet of this chipset.  IIRC, we got a source
code from Acer, but not a datasheet.

Anyway, ali5451 looks pretty similar with Trident 4D DX/NX.
The chip supports only 2 fixed periods.  If you need more periods,
allocate an extra voice with the period size and let it generating
interrupts but not producing sounds.


Takashi


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