On Thu, Apr 12, 2018 at 07:30:01PM +0800, Baolin Wang wrote: > >> > what does block and transaction len refer to here > >> > >> Our DMA has 3 transfer mode: transaction transfer, block transfer and > >> fragment transfer. One transaction transfer can contain several blocks > >> transfer, and each block can be set proper block step. One block can > >> contain several fragments transfer with proper fragment step. It can > >> generate interrupts when one transaction transfer or block transfer or > >> fragment transfer is completed if user set the interrupt type. So here > >> we should set the length for transaction transfer, block transfer and > >> fragment transfer. > > > > what are the max size these types support? > > These types max size definition: > > #define SPRD_DMA_FRG_LEN_MASK GENMASK(16, 0) > > #define SPRD_DMA_BLK_LEN_MASK GENMASK(16, 0) > > #define SPRD_DMA_TRSC_LEN_MASK GENMASK(27, 0) They are register defines. How many items or bytes do each type of txn support? -- ~Vinod -- 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
