[MinnowBoard] Where is the MBM I2S driver in Linux

[Strasser, Kevin]

Hi Li,

On 06/01/15 8:03 PM, li yuqian wrote:
> check those driver, and i can understand there are three parts for the LPE
> driver to working, special for the LPE firmware need to adde it. i can figure
> it out in the
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/sound/soc/intel/sst-acpi.c?id=refs/tags/v4.0.4
> line 249 and 250.
>
> but when i checked that sst-acpi.c, i found the baytrial sst is not support
> the DMA data transfer, see the resindex_dma_base = -1 in line 262 and line 51
> /* DMA only valid when resindex_dma_base != -1*/
>
> Am i correct? the MBM i2s does not support DMA data transfer?

You are correct, the Bay Trail LPE driver does not use DMA. I think that is just
a driver limitation, and does not necessarily indicate that the hardware isn't
capable.

Liam, can you provide any context here?

Thanks,
Kevin