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

Janusz Krzysztofik jkrzyszt at tis.icnet.pl
Thu Jun 18 13:51:58 CEST 2009

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 ;).


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