Hello Mark,
Sorry for the late answer, i was OoO...
On 02/16/2017 09:14 PM, Mark Brown wrote:
On Wed, Feb 15, 2017 at 04:46:44PM +0100, Arnaud Pouliquen wrote:
On 02/15/2017 03:53 PM, Mark Brown wrote:
On Wed, Feb 15, 2017 at 02:59:18PM +0100, Arnaud Pouliquen wrote:
No, copy() is an alternative to doing DMA rather than something that works with DMA. If you want to have some sort of post processing operation it shoudn't be called copy(). It's probably worth considering just making a new format and letting userspace convert things here.
You mean using a plug-in alsa to do it? this seems not possible with tiny-alsa... Without a plug-in, driver will not be compatible with standard audio application.
Right. But if you're using tinyalsa you've got some open coded system specific stuff anyway!
Do you think this would be reasonable if i implement something similar in my driver, without using the soc generic DMA engine?
Probably. It might even be possible to fit it elegently into the generic dmaengine code, just don't say it's a copy() operation since that's a specific thing in ALSA.
Ok I will have a look in generic dmaengine and try to propose something in this way in the V2.
Regards, Arnaud