I've been using the ASoC drivers from DaVinci git kernel, and DMA works
most of the time. I've found occasionally with latest 2.6.26 git, the
DMA module hangs more frequently, failing to get the XEVT trigger from
the ASP peripheral. The event can be manually triggered by setting bit
4 of the ESR, but still looking for the root cause of this stall. Any help?
Thanks,
Mark
Advanced Communication Design
Sun, ChengHao wrote:
Dear Swami,
I ported the ALSA driver from opensource 2.6.25 to the ti-davinci
2.6.10,
seamed like the first DMA package make some noise can be heared from
earphone,
But the DMA not going on, the application continue write data to the
device but the driver don't send data to device.
Thank you!
Chenghao Sun
-----Original Message-----
From: Subbrathnam, Swaminathan [mailto:[EMAIL PROTECTED]
Sent: Monday, August 11, 2008 6:32 PM
To: Sun, ChengHao; [email protected]
Subject: RE: Question about ALSA audio driver dma
Cheng,
What is your kernel version 2.6.10 ?
Regards
Swami
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-----Original Message-----
From:
[EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
idsp.com] On Behalf Of Sun, ChengHao
Sent: Monday, August 11, 2008 3:59 PM
To: [email protected]
Subject: Question about ALSA audio driver dma
Hi:
Are there anybody using the ALSA architecture aic33 driver on davinci
platform?
I tried but still can't trigger the DMA of ALSA davinci audio driver,
Why the ALSA DMA operation are not as much as in OSS one?
For example :
About the DMA channel request, in OSS architecture, the
davinci_request_sound_dma in Sound/oss/davinci-audio-dma-intfc.c
will request 2 slave DMA channels for stereo , but the
davinci_pcm_dma_request in sound/soc/davinci/davinci-pcm.c only request
1 slave channel,
About to trigger DMA play, the OSS will set src/dest parameter and
index, transfer parameters(by audio_set_dma_params_play) every time
before start dma(davinci_start_dma, davinci_mcbsp_start), but the ALSA
will not do any settings before start
dma(davinci_start_dma,davinci_mcbsp_start),
Could any body give some direction on the ALSA driver on davinci?
Thanks a lot for your help!!
Best Regards
Chenghao
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