PXA270 audio problem

[Santhosh N]

Hi,

Following is the way I reach the no audio playback state.

I have put a loop in a shell script and play a short mp3 file
repeatedly. The no audio playback state is reached sometimes very
quickly and sometimes after a while.

Regards,
Santhosh N

On Thu, Sep 23, 2010 at 12:35 PM, Santhosh N <san.mlists at gmail.com> wrote:
> Hi,
>
> Following are the AC97 and DMA register dumps. I am printing out the
> DMA registers from the pxa2xx_pcm_trigger function.
>
> I have noticed that, the touchscreen and audio record continues to
> work after the problem. In the problem state, the DMA interrupts occur
> for audio record but not for playback.
>
> AC97:
> BeforeProblem                   AfterProblem
> 0:00 = 02a0                     0:00 = 02a0
> 0:02 = 0d0d                     0:02 = 0d0d
> 0:04 = 0000                     0:04 = 0000
> 0:06 = 0000                     0:06 = 0000
> 0:08 = 0000                     0:08 = 0000
> 0:0a = 0000                     0:0a = 0000
> 0:0c = 0000                     0:0c = 0000
> 0:0e = 0000                     0:0e = 0000
> 0:10 = 0000                     0:10 = 0000
> 0:12 = 0000                     0:12 = 0000
> 0:14 = 0000                     0:14 = 0000
> 0:16 = 0000                     0:16 = 0000
> 0:18 = 0000                     0:18 = 0000
> 0:1a = 0000                     0:1a = 0000
> 0:1c = 0000                     0:1c = 0000
> 0:1e = 0000                     0:1e = 0000
> 0:20 = 0000                     0:20 = 0000
> 0:22 = 0000                     0:22 = 0000
> 0:24 = 0000                     0:24 = 0000
> 0:26 = 000b                     0:26 = 000b
> 0:28 = 0001                     0:28 = 0001
> 0:2a = 0001                     0:2a = 0001
> 0:2c = 5622                     0:2c = 3e80
> 0:2e = 0000                     0:2e = 0000
> 0:30 = 0000                     0:30 = 0000
> 0:32 = bb80                     0:32 = bb80
> 0:34 = 0000                     0:34 = 0000
> 0:36 = 0000                     0:36 = 0000
> 0:38 = 0000                     0:38 = 0000
> 0:3a = 0000                     0:3a = 0000
> 0:3c = 0000                     0:3c = 0000
> 0:3e = 0000                     0:3e = 0000
> 0:40 = 0000                     0:40 = 0000
> 0:42 = 0000                     0:42 = 0000
> 0:44 = 0000                     0:44 = 0000
> 0:46 = 0000                     0:46 = 0000
> 0:48 = 0000                     0:48 = 0000
> 0:4a = 0000                     0:4a = 0000
> 0:4c = 0000                     0:4c = 0000
> 0:4e = 0000                     0:4e = 0000
> 0:50 = 0000                     0:50 = 0000
> 0:52 = 0000                     0:52 = 0000
> 0:54 = 0000                     0:54 = 0000
> 0:56 = 0000                     0:56 = 0000
> 0:58 = 0000                     0:58 = 0000
> 0:5a = 0000                     0:5a = 0000
> 0:5c = 0000                     0:5c = 0000
> 0:5e = 0000                     0:5e = 0000
> 0:60 = 0000                     0:60 = 0000
> 0:62 = 0000                     0:62 = 0000
> 0:64 = 0948                     0:64 = 0948
> 0:66 = 0000                     0:66 = 0000
> 0:68 = 824b                     0:68 = 824b
> 0:6a = 0050                     0:6a = 0050
> 0:6c = 0030                     0:6c = 0030
> 0:6e = 2004                     0:6e = 2004
> 0:70 = 0000                     0:70 = 0000
> 0:72 = 0000                     0:72 = 0000
> 0:74 = 0000                     0:74 = 0000
> 0:76 = 0000                     0:76 = 0000
> 0:78 = 0000                     0:78 = 0000
> 0:7a = 0000                     0:7a = 0000
> 0:7c = 5053                     0:7c = 5053
> 0:7e = 4304                     0:7e = 4304
>
> Only diff in the above is in the 02C(Audio sample rate control) register.
>
> DMA:
> BeforeProblem
> ::: DMA Channel: 8, Trigger Start
> DDADR = 0xB714A010
> DSADR = 0xB7100040
> DTADR = 0x40500040
> DCMD  = 0x9023CFC0
> DCSR  = 0x80000000
> ::: DMA Channel: 8, Trigger Stop
> DDADR = 0xB714A0E0
> DSADR = 0xB710D000
> DTADR = 0x40500040
> DCMD  = 0x9023D000
> DCSR  = 0x00000008
>
>
> AfterProblem
> ::: DMA Channel: 8, Trigger Start
> DDADR = 0xB70B7010
> DSADR = 0xB7100000
> DTADR = 0x40500040
> DCMD  = 0x9023D000
> DCSR  = 0x80000000
> ALSA sound/core/pcm_native.c:1512: playback drain error (DMA or IRQ trouble?)
> ::: DMA Channel: 8, Trigger Stop
> DDADR = 0xB70B7010
> DSADR = 0xB7100000
> DTADR = 0x40500040
> DCMD  = 0x9023D000
> DCSR  = 0x00000008
>
> Each dump above is after playing a mp3 file using madplay.
>
> Regards,
> Santhosh N
>
> On Thu, Sep 23, 2010 at 11:38 AM, Eric Miao <eric.y.miao at gmail.com> wrote:
>> On Thu, Sep 23, 2010 at 1:33 PM, Santhosh N <san.mlists at gmail.com> wrote:
>>> Dear All,
>>>
>>> I am running linux 2.6.26 kernel on a PXA270 board. A UCB1400 chip
>>> used for audio and touchscreen in that. I have been facing a problem
>>> with audio.
>>>
>>> The audio plays properly, but suddenly stops. I get the following message:
>>> ALSA sound/core/pcm_native.c:1513: playback drain error (DMA or IRQ trouble?)
>>>
>>> I have noticed that the DMA interrupts stop coming. Where as the AC97
>>> interrupts come properly.
>>>
>>> Any help in solving this will be grateful.
>>>
>>
>> Dumping the DMA registers and the AC97 controller registers would
>> be helpful.
>>
>>> Regards,
>>> Santhosh N
>>>
>>> _______________________________________________
>>> linux-arm-kernel mailing list
>>> linux-arm-kernel at lists.infradead.org
>>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>>>
>>
>