This is a note to let you know that I've just added the patch titled
serial: mxs-auart: fix tx
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-mxs-auart-fix-tx.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 7be50f2e8f20fc2299069b28dea59a28e3abe20a Mon Sep 17 00:00:00 2001
From: "Jiri Slaby (SUSE)" <jirislaby@xxxxxxxxxx>
Date: Thu, 1 Feb 2024 11:55:57 +0100
Subject: serial: mxs-auart: fix tx
From: Jiri Slaby (SUSE) <jirislaby@xxxxxxxxxx>
commit 7be50f2e8f20fc2299069b28dea59a28e3abe20a upstream.
Emil reports:
After updating Linux on an i.MX28 board, serial communication over
AUART broke. When I TX from the board and measure on the TX pin, it
seems like the HW fifo is not emptied before the transmission is
stopped.
MXS performs weird things with stop_tx(). The driver makes it
conditional on uart_tx_stopped().
So the driver needs special handling. Pass the brand new UART_TX_NOSTOP
to uart_port_tx_flags() and handle the stop on its own.
Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@xxxxxxxxxx>
Reported-by: Emil Kronborg <emil.kronborg@xxxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxx>
Fixes: 2d141e683e9a ("tty: serial: use uart_port_tx() helper")
Closes: https://lore.kernel.org/all/miwgbnvy3hjpnricubg76ytpn7xoceehwahupy25bubbduu23s@om2lptpa26xw/
Tested-by: Stefan Wahren <wahrenst@xxxxxxx>
Tested-by: Emil Kronborg <emil.kronborg@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240201105557.28043-2-jirislaby@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/mxs-auart.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -605,13 +605,16 @@ static void mxs_auart_tx_chars(struct mx
return;
}
- pending = uart_port_tx(&s->port, ch,
+ pending = uart_port_tx_flags(&s->port, ch, UART_TX_NOSTOP,
!(mxs_read(s, REG_STAT) & AUART_STAT_TXFF),
mxs_write(ch, s, REG_DATA));
if (pending)
mxs_set(AUART_INTR_TXIEN, s, REG_INTR);
else
mxs_clr(AUART_INTR_TXIEN, s, REG_INTR);
+
+ if (uart_tx_stopped(&s->port))
+ mxs_auart_stop_tx(&s->port);
}
static void mxs_auart_rx_char(struct mxs_auart_port *s)
Patches currently in stable-queue which might be from jirislaby@xxxxxxxxxx are
queue-6.6/serial-mxs-auart-fix-tx.patch
queue-6.6/serial-core-introduce-uart_port_tx_flags.patch
