[alsa-devel] Progress in adding ams-delta support to ASoC?

Tony Lindgren tony at atomide.com
Thu Jun 18 12:21:44 CEST 2009

* Janusz Krzysztofik <jkrzyszt at tis.icnet.pl> [090618 14:52]:
> Tony Lindgren wrote:
>> * Peter Ujfalusi <peter.ujfalusi at nokia.com> [090618 12:03]:
>>> On Wednesday 17 June 2009 17:12:38 ext Janusz Krzysztofik wrote:
>>>> Janusz Krzysztofik wrote:
>>>>> After all, it is more and more likely that the problem is not dma, but
>>>>> mcbsp just not shifting any data for some mysterious reason.
>>>> I finally did what I should have already done before: learned about
>>>> dynamic debugging, turned it on and probably got the answer from
>>>> omap_msbsp_dump_reg(): all mcbsp1 register read operations returned
>>>> 0xffff. So it looks like I simply get no acccess to mcbsp1 at all. Now I
>>>> wonder if I can close this thread with a conclusion that mcbsp1 on
>>>> opam15xx is simply not yet supported by the mainline kernel that I have
>>>> based my work on.
>>> Hmmm, this is quite unexpected.
>>> Can you access to mcbsp2 or 3 registers, or only the mcbsp1 registers 
>>> are not accessible?
>>> One thing that I have noticed is that the McBSP1 (and 3) is under the 
>>> DSP Public Peripherals, while McBSP2 is under MPU Public Peripherals 
>>> (in OMAP1510).
>>> I have to check it further what this actually means...
>> Hmmm, do you have the DSP code compiled (and loaded)?
>> On omap1, DSP needs to be powered and idled before some mcbsp clocks can
>> be used. Or at least needs to be powered up.
> AFAICS there is no DSP code in mainline at all, so the answer is no, DSP  
> was likely not powered up at all. For several weeks I was trying to do  
> what was impossible :/. But fortunatelly, I have learned a lot ;).

We at least used to have code to power and idle the DSP even without the
dspgateway compiled in.. Sorry I don't remember the details. But most
likely you need to have the dspgateway patch enabled.

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