This is a note to let you know that I've just added the patch titled
serial: fsl_lpuart: RS485 RTS polariy is inverse
to the 4.19-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-fsl_lpuart-rs485-rts-polariy-is-inverse.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 846651eca073e2e02e37490a4a52752415d84781 Mon Sep 17 00:00:00 2001
From: Shenwei Wang <shenwei.wang@xxxxxxx>
Date: Fri, 5 Aug 2022 09:45:29 -0500
Subject: serial: fsl_lpuart: RS485 RTS polariy is inverse
From: Shenwei Wang <shenwei.wang@xxxxxxx>
commit 846651eca073e2e02e37490a4a52752415d84781 upstream.
The setting of RS485 RTS polarity is inverse in the current driver.
When the property of 'rs485-rts-active-low' is enabled in the dts node,
the RTS signal should be LOW during sending. Otherwise, if there is no
such a property, the RTS should be HIGH during sending.
Fixes: 03895cf41d18 ("tty: serial: fsl_lpuart: Add support for RS-485")
Cc: stable <stable@xxxxxxxxxx>
Signed-off-by: Nicolas Diaz <nicolas.diaz@xxxxxxx>
Signed-off-by: Shenwei Wang <shenwei.wang@xxxxxxx>
Link: https://lore.kernel.org/r/20220805144529.604856-1-shenwei.wang@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/fsl_lpuart.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1102,9 +1102,9 @@ static int lpuart_config_rs485(struct ua
* Note: UART is assumed to be active high.
*/
if (rs485->flags & SER_RS485_RTS_ON_SEND)
- modem &= ~UARTMODEM_TXRTSPOL;
- else if (rs485->flags & SER_RS485_RTS_AFTER_SEND)
modem |= UARTMODEM_TXRTSPOL;
+ else if (rs485->flags & SER_RS485_RTS_AFTER_SEND)
+ modem &= ~UARTMODEM_TXRTSPOL;
}
/* Store the new configuration */
Patches currently in stable-queue which might be from shenwei.wang@xxxxxxx are
queue-4.19/serial-fsl_lpuart-rs485-rts-polariy-is-inverse.patch
