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From: Gabriel Somlo <gsomlo@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: linux-serial@vger.kernel.org, gregkh@linuxfoundation.org,
jirislaby@kernel.org, kgugala@antmicro.com, mholenko@antmicro.com,
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Subject: [PATCH v4 07/14] serial: liteuart: rx loop should only ack rx events
Date: Wed, 16 Nov 2022 09:49:01 -0500
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|
| Series |
serial: liteuart: add IRQ support
|
|
Commit Message
Gabriel L. Somlo
Nov. 16, 2022, 2:49 p.m. UTC
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>
---
drivers/tty/serial/liteuart.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/liteuart.c b/drivers/tty/serial/liteuart.c index 81a86c5eb393..c90ab65fbdcf 100644 --- a/drivers/tty/serial/liteuart.c +++ b/drivers/tty/serial/liteuart.c @@ -82,7 +82,7 @@ static void liteuart_timer(struct timer_list *t) port->icount.rx++; /* necessary for RXEMPTY to refresh its value */ - litex_write8(membase + OFF_EV_PENDING, EV_TX | EV_RX); + litex_write8(membase + OFF_EV_PENDING, EV_RX); /* no overflow bits in status */ if (!(uart_handle_sysrq_char(port, ch)))