On Mon, Jul 14, 2014 at 10:06:16PM +0530, Vinod Koul wrote: > On Fri, May 30, 2014 at 03:49:50PM -0500, Andy Gross wrote: > > This patch adds support for end of transaction (EOT) and notify when done (NWD) > > hardware descriptor flags. > > > > The EOT flag requests that the peripheral assert an end of transaction interrupt > > when that descriptor is complete. It also results in special signaling protocol > > that is used between the attached peripheral and the core using the DMA > > controller. Clients will specify DMA_PREP_INTERRUPT to enable this flag. > > > > The NWD flag requests that the peripheral wait until the data has been fully > > processed by the peripheral before moving on to the next descriptor. Clients > > will specify DMA_PREP_FENCE to enable this flag. > > I am going to apply this, but pls send a follow up patch to add comments on the > flags and their behaviour. I think it is required! Will do. <snip> > > #define DESC_FLAG_EOT BIT(14) > > #define DESC_FLAG_EOB BIT(13) > > +#define DESC_FLAG_NWD BIT(12) > explaining behvaiour will help.. In the followup, I'll put in a lengthy description of the INT/EOT/NWD and how they are used in the signaling to/from the attached peripheral. Thanks! -- sent by an employee of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
