On Fri, Apr 8, 2016 at 2:54 AM, Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> wrote: > On 04/07/2016 01:37 PM, Andy Shevchenko wrote: >> If we get an exeption interrupt. i.e. UART_IIR_RLSI, stop any ongoing RX DMA >> transfer otherwise it might generates more spurious interrupts and make port >> unavailable anymore. > > Then how to know which rx byte the error is for if dma continues anyway? > What if there are multiple error bytes? And how should it work? We get an interrupt during DMA, if we don't stop DMA it will be racy with direct readings. > > >> As has been seen on Intel Broxton system: > > This system shouldn't be setup for UART DMA imo. Same approach is done in 8250_omap. -- With Best Regards, Andy Shevchenko -- 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
