On Fri, Jan 15, 2016 at 09:03:28AM -0800, Caleb Crome wrote: > If nobody objects, we can just set the value to 4 and be done with it. I agree. And we may apply it only to i.MX platforms with DMA if other platform owners feel comfortable with the previous settings. > Another question: is the watermark ever going to be different than > maxburst? Is there any reason to have them different? The watermark is merely a threshold to trigger a DMA request. The only relationship with the burst size is that each burst transfer should not carry more data than the number of empty slots; FIFO under/overflow occurs otherwise. So it's just more efficient and safer to set an identical value to both of them. I don't think it will cause functional problems to set TFWM to 4 and burst size to 1 -- It just lets DMA operate in a single data transfer mode. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
