Re: [PATCH 0/4] serial: omap: robustify for high speed transfers

[Tony Lindgren]

Hi,

* John Ogness <john.ogness@xxxxxxxxxxxxx> [160211 04:04]:
> 
> At these speeds, nearly every DMA interrupt is accompanied by a spurious
> UART interrupt. So, sadly, the interrupts are doubled.
> 
> It is on my TODO list to verify if the spurious UART interrupts exactly
> match the recently added [0] spurious interrupt detection in omap-intc.

If you're seeing spurious interrupts you may want try adding
a flush of posted write at the end of the 8250_omap interrupt
handler. Basically read back some register from the 8250. This
has fixed so far pretty much all the spurious IRQ issues for
omaps using the drivers/irqchip/irq-omap-intc.c, meaning omap3
and am335x and ti81xx variants too most likely.

Regards,

Tony