T Ziomek wrote:
> On Tue, 19 Feb 2008, Stephen Berry wrote:
>>
>> We have developed our own DM350 product that is loosely based on the
>> 355EVM. We have replaced the decoder, removed the MSP430, redesigned the
> . . .
>> So, here is my problem - the DMA channel that is "assigned" for the
>> audio_open() (davinci-audio.c) function is wrong. And I can't figure out
>> where it is coming from !
> . . .
>> So what I see is that 'is->dma_dev' is being passed to me as a 9. This
>> corresponds to the EDMA channel for ASP1 - not zero like I want. I
>> confirmed that this was indeed the problem by forcing the channel to 3
>> (ASP0 for record) and I suddenly have tons of dma !
>>
>> But I need to fix the underlying problem ... Can anyone tell me who or
>> what determines the DMA channel for the audio?
>
> Did you do a grep for "dma_dev" in the DM355-related files in the direc-
> tory containing the kernel source for your ASP/McBSP driver? I'm using
> the DM6446 and they're in sound/oss for me, but it's probably done the
> same way for you:
>
> % fgrep dma_dev sound/oss/*davinci*.[ch]
> sound/oss/davinci-audio-aic33.c: .dma_dev = DAVINCI_DMA_MCBSP1_TX,
> sound/oss/davinci-audio-aic33.c: .dma_dev = DAVINCI_DMA_MCBSP1_RX,
> sound/oss/davinci-audio-dma-intfc.h:#define DMA_REQUEST(e,s, cb)
> {e=davinci_request_sound_dma(s->dma_dev, s->id, s, &s->master_ch,
> &s->lch);}
> sound/oss/davinci-audio.h: int dma_dev; /* device
> identifier for DMA */
> %
>
> Then I find DAVINCI_DMA_MCBSP1_TX/RX in include/asm/arch/edma.h .
>
> Tom
Ahh - found the problem - simple mistake on my part. Thanks for pointing
me to the right place...
Steve
_______________________________________________
Davinci-linux-open-source mailing list
[email protected]
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
