[alsa-devel] [PATCH] [ALSA] mpc8610: Add mmap support
timur at freescale.com
Thu Jan 17 17:31:37 CET 2008
Alexander E. Patrakov wrote:
> Timur Tabi wrote:
>> Enable mmap support in the MPC8610 ASoC driver. The driver can use
>> default mmap functionality, it was just not enabled previously.
>> Signed-off-by: Timur Tabi <timur at freescale.com>
> [sorry, I may be completely wrong below about the .page callback purpose
> - in this case, just confirm that the testcase works]
> Hm, the "struct snd_pcm_ops fsl_dma_ops" doesn't contain the .page
> callback. With saa7134-alsa, this led to the "device claims to support
> mmap but actually doesn't work" bug, see the following subthread:
Isn't that an ARM chip? The default MMAP handler in ALSA doesn't support ARM,
but it works for PowerPC.
> IOW: have you actually tested that the following commands work (X,Y
> refer to the FSL chip)?
> aplay -M -D hw:X,Y sample.wav
> arecord -f cd -M -D:X,Y capture.wav
I haven't tried record, but I did try playback, and it worked. Without this
patch, adding -M gives me this error:
aplay: set_params:852: Access type not available
After applying this patch, playback works fine.
Linux kernel developer at Freescale
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