On Tue, Mar 05, 2013 at 10:37:27PM +0800, Shawn Guo wrote:
With generic DMA device tree binding and helper function dma_request_slave_channel() in place, dmaengine_pcm should support that in requesting DMA channel for users that support generic DMA device tree binding.
This purpetuates the brain-dead behaviour of the existing ASoC DMA engine layer, which makes it unsuitable for platforms with special DMA memory requirements.
The problem is that the DMA mask to be used for allocating DMA-able memory is the DMA engine struct device, not the struct device associated with the ASoC device.
I got this right in my ASoC generic DMA engine layer. Converting this layer is far from trivial though, and as my test platform has now become my entire network firewall, I'm not doing any testing on that anymore.