Hi Kevin, 2015-06-03 1:27 GMT+08:00 Strasser, Kevin <kevin.stras...@intel.com>:
> 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 Yes, i understand that hardware must be supported DMA. just wondering Will intel release a new driver to make it use DMA for the data transfer as without DMA it is useless. if will release, when will release? thanks :)
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