iabdalkader 2e62e13455 rp2/machine_uart: Fix poll ioctl to also check hardware FIFO.
The RX IRQ does not trigger if the FIFO is less than the trigger level, in
which case characters may be available in the FIFO, yet not in the ringbuf,
and the ioctl returns false.
2021-07-25 17:11:03 +10:00
..