[#4188] Can not play audio on AD1981 board in trunk

Submitted By: Vivi Li

Open Date

2008-06-23 08:58:25 Close Date

2008-07-01 22:56:05

Priority:

Medium Assignee:

Cliff Cai

Status:

Closed Fixed In Release:

N/A

Found In Release:

N/A Release:

Category:

N/A Board:

N/A

Processor:

N/A Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Rejected

Uboot version or rev.:

Toolchain version or rev.:

08r1-8

App binary format:

N/A

Summary: Can not play audio on AD1981 board in trunk

Details:

In trunk, on bf537-stamp with AD1981 built-in driver, play audio failed.

root:/> arecord -t wav -c 2 -f S16_LE -r 8000 -d 5 wav^M

Recording WAVE 'wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Stereo^M

root:/>

Case 1 ...PASS

aplay wav^M

Failed to allocate memory for tx dma buf^M

asoc: platform prepare error^M

ALSA lib ../../../alsa-lib-1.0.12/src/pcm/pcm_direct.c:985:(snd_pcm_direct_initialize_slave) unable to install hw params^M

ALSA lib ../../../alsa-lib-1.0.12/src/pcm/pcm_dmix.c:876:(snd_pcm_dmix_open) unable to initialize slave^M

aplay: main:550: audio open error: Cannot allocate memory^M

root:/>

Follow-ups

--- Cliff Cai 2008-06-27 07:46:58

I think you should select 2M uncache DMA buffer.

Cliff

--- Robin Getz 2008-06-27 10:17:34

Cliff:

- how is it possible that to play an audio file, needs 2 Meg of memory?

- can you make the error message more clear:How about something like:

"Failed to allocate 512k of memory for tx dma buf - increase uncached

area"

--- Cliff Cai 2008-06-30 03:25:23

Hi Robin,

it doesn't mean it need 2M memmory,maybe just need more than 1M memory,since we

introduce 2 extra intermediate buffer(RX/TX)for implementing mmap and AC97 even

need more memory to construct ac97 frame.

For ad1980/1,currently we report to upper driver that we can allocate up to

128k memory for one PCM stream,the driver works in AC97 mode,so we need to

allocate 128*sizeof(ac97_frame)/4 for DMA.That means we need memory with size

640k(RX and TX,2*(128*10/4))If the driver is in mmap mode,we need to double that

memory size.

OK,I will add more detailed information.

Cliff

--- Vivi Li 2008-07-01 22:56:02

It's OK after I set 2M uncache DMA buffer.

Close it.

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