There seems to be an issue where if the receive interrupt is enabled
when the receive queue is emptied, the interrupt status register will
get updated but the actual interrupt line may not update. This can be
worked around by disabling the receive interrupt in IER and then
restoring the desired value to IER. In some downstream code, this is
done in the IRQ handler when we detect a spurious interrupt, but
presumably it could be done elsewhere as well.
David, can you try if doing that fixes the issue?
Mikko
On 15.06.2018 00:17, Dmitry Osipenko wrote:
BTW, in serial8250_config_port() there is an interesting comment:
/* HW bugs may trigger IRQ while IIR == NO_INT */
if (port->type == PORT_TEGRA)
up->bugs |= UART_BUG_NOMSR;
Maybe that's what causes your trouble and the workaround isn't working
properly.
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