This is a note to let you know that I've just added the patch titled
serial: stm32: do not always set SER_RS485_RX_DURING_TX if RS485 is enabled
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-stm32-do-not-always-set-ser_rs485_rx_during_tx-if-rs485-is-enabled.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f418ae73311deb901c0110b08d1bbafc20c1820e Mon Sep 17 00:00:00 2001
From: Lino Sanfilippo <l.sanfilippo@xxxxxxxxxx>
Date: Fri, 16 Feb 2024 23:47:07 +0100
Subject: serial: stm32: do not always set SER_RS485_RX_DURING_TX if RS485 is enabled
From: Lino Sanfilippo <l.sanfilippo@xxxxxxxxxx>
commit f418ae73311deb901c0110b08d1bbafc20c1820e upstream.
Before commit 07c30ea5861f ("serial: Do not hold the port lock when setting
rx-during-tx GPIO") the SER_RS485_RX_DURING_TX flag was only set if the
rx-during-tx mode was not controlled by a GPIO. Now the flag is set
unconditionally when RS485 is enabled. This results in an incorrect setting
if the rx-during-tx GPIO is not asserted.
Fix this by setting the flag only if the rx-during-tx mode is not
controlled by a GPIO and thus restore the correct behaviour.
Cc: stable@xxxxxxxxxxxxxxx # 6.6+
Fixes: 07c30ea5861f ("serial: Do not hold the port lock when setting rx-during-tx GPIO")
Signed-off-by: Lino Sanfilippo <l.sanfilippo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240216224709.9928-1-l.sanfilippo@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/stm32-usart.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 794b77512740..693e932d6feb 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -251,7 +251,9 @@ static int stm32_usart_config_rs485(struct uart_port *port, struct ktermios *ter
writel_relaxed(cr3, port->membase + ofs->cr3);
writel_relaxed(cr1, port->membase + ofs->cr1);
- rs485conf->flags |= SER_RS485_RX_DURING_TX;
+ if (!port->rs485_rx_during_tx_gpio)
+ rs485conf->flags |= SER_RS485_RX_DURING_TX;
+
} else {
stm32_usart_clr_bits(port, ofs->cr3,
USART_CR3_DEM | USART_CR3_DEP);
--
2.44.0
Patches currently in stable-queue which might be from l.sanfilippo@xxxxxxxxxx are
queue-6.6/serial-amba-pl011-fix-dma-transmission-in-rs485-mode.patch
queue-6.6/serial-stm32-do-not-always-set-ser_rs485_rx_during_tx-if-rs485-is-enabled.patch
