On Thu, Jun 28, 2012 at 12:31:26PM +0530, Laxman Dewangan wrote:

The pcm mmap for the substream dma buffer is done using the dma_mmap_writecombine(). Some of the chip sound driver like Spear, Tegra, Davinci, ep93xx,snd_imx, snd_mxs, NUC900, OMAP, Samsung are doing this mapping locally. Add api in the snd dmaengine driver so that different client of snd dmaengine can use this rather than implementing locally.

OK, but I'd expect this to come along with one or more patches converting at least some of the users to the new API...