On Wednesday 13 April 2016 05:30 AM, Peter Hurley wrote: >>> - generates spurious uart interrupt for every rx dma transaction >>> (ie., necessitates acking every UART interrupt, even UART_IIR_NO_INT) >>> _Even with this workaround_, it still generates spurious interrupt warning >>> which shuts off interrupts for several ms while logging the error >>> message to the console, virtually guaranteeing lost data. >> >> as I wrote in my other email I think RDI should be disabled with DMA > > > I'll test to see if disabling RDI eliminates the UART_IIR_NO_INT spurious > interrupts. > >> according the Intel manual and I *think* someone here reported that >> they see the same problem. > > Let's confirm with the Intel folks that this is true, which would argue > for using the omap-style rx dma flow.
Andy Shevchenko pointed this out here: https://lkml.org/lkml/2016/2/23/588 Regards, Sekhar
