Hi all, BTW the reason that use of DMA is selectable by a parameter is that on some architectures (for example the venerable S3C24x0) the cost for its setup is so high that it doesn't make sense for smaller transfers. I absolutely agree with Stefano and Alexander, the SPI master driver is in the best position to decide if DMA is worth or not.
On Tue, Aug 5, 2014 at 10:23 AM, Stefano Babic <sba...@denx.de> wrote: >> Just for information: On my opinion, all SPI DMA stuff should be going into >> SPI layer. >> It is not a good idea to keep this into this driver. > > If I can add my two cents, I agree with Alexander. An underlying SPI > (master) controller driver can or cannot support DMA transfer, and this > should be transparent to the CAN layer. The mcp251x driver works with > both of them, taking advantage when DMA is available. -- Christian Pellegrin, see http://www.evolware.org/chri/ "Real Programmers don't play tennis, or any other sport which requires you to change clothes. Mountain climbing is OK, and Real Programmers wear their climbing boots to work in case a mountain should suddenly spring up in the middle of the computer room." -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
