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 _______________________________________________ elinux-MinnowBoard mailing list elinux-MinnowBoard@lists.elinux.org http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
