On Tue, 2016-04-12 at 17:25 +0100, Bryan O'Donoghue wrote: > On Mon, 2016-04-11 at 18:51 +0300, Andy Shevchenko wrote: > > > > On Mon, Apr 11, 2016 at 6:33 PM, Bryan O'Donoghue > > <pure.logic@xxxxxxxxxxxxxxxxx> wrote: > > > > > > On Thu, 2016-04-07 at 23:37 +0300, Andy Shevchenko wrote: > > > > > > Preface. I tried this on Galileo and it appears to work. I'll do > > > some > > > throughput testing to verify but, initially the results are > > > positive :) > > I submitted (and pushed into my branch) a bit changed version (see > > my > > v2). > > > > > > > > > > > > > + lpss->dma_maxburst = 8; > > > Are these dwords ? If those are bytes then the maxburst value > > > looks > > > small. In the BSP the max burst is 32 bytes. > > max_burst is in items of given size (here is 32 bytes for memory > > and > > 8 > I haven't read your V2 yet but on this, I'd suggest raising the burst > size to 32 bytes for UART (no higher) we found during bringup that > larger sizes "fall-over and die" but, anything up to 32 bytes is OK - > and therefore you should be able to reduce the number of > bursts/interrupts etc. It can't be more that FIFO size and recommendation as far as I know is FIFO/2, which is exactly 8 bytes. -- Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Intel Finland Oy -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
