Cheng,
What is your kernel version 2.6.10 ?
Regards
Swami
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-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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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