serial: liteuart: rx loop should only ack rx events
While receiving characters, it is necessary to acknowledge each one by writing to the EV_PENDING register's EV_RX bit. Ensure we do not also gratuitously set the EV_TX bit in the process. Signed-off-by: Gabriel Somlo <gsomlo@gmail.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20221123130500.1030189-8-gsomlo@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -82,7 +82,7 @@ static void liteuart_timer(struct timer_list *t)
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port->icount.rx++;
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/* necessary for RXEMPTY to refresh its value */
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litex_write8(membase + OFF_EV_PENDING, EV_TX | EV_RX);
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litex_write8(membase + OFF_EV_PENDING, EV_RX);
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/* no overflow bits in status */
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if (!(uart_handle_sysrq_char(port, ch)))
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