This is a note to let you know that I've just added the patch titled
tty: serial: fsl_lpuart: specify transmit FIFO size
to the 3.19-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:
tty-serial-fsl_lpuart-specify-transmit-fifo-size.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4e8f245937091b2c9eebf3d4909c9ceda4f0a78e Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@xxxxxxxx>
Date: Fri, 13 Mar 2015 14:51:50 +0100
Subject: tty: serial: fsl_lpuart: specify transmit FIFO size
From: Stefan Agner <stefan@xxxxxxxx>
commit 4e8f245937091b2c9eebf3d4909c9ceda4f0a78e upstream.
Specify transmit FIFO size which might be different depending on
LPUART instance. This makes sure uart_wait_until_sent in serial
core getting called, which in turn waits and checks if the FIFO
is really empty on shutdown by using the tx_empty callback.
Without the call of this callback, the last several characters
might not yet be transmitted when closing the serial port. This
can be reproduced by simply using echo and redirect the output to
a ttyLP device.
Signed-off-by: Stefan Agner <stefan@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/fsl_lpuart.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1095,6 +1095,8 @@ static int lpuart_startup(struct uart_po
sport->txfifo_size = 0x1 << (((temp >> UARTPFIFO_TXSIZE_OFF) &
UARTPFIFO_FIFOSIZE_MASK) + 1);
+ sport->port.fifosize = sport->txfifo_size;
+
sport->rxfifo_size = 0x1 << (((temp >> UARTPFIFO_RXSIZE_OFF) &
UARTPFIFO_FIFOSIZE_MASK) + 1);
Patches currently in stable-queue which might be from stefan@xxxxxxxx are
queue-3.19/iio-adc-vf610-use-adc-clock-within-specification.patch
queue-3.19/tty-serial-fsl_lpuart-clear-receive-flag-on-fifo-flush.patch
queue-3.19/tty-serial-fsl_lpuart-specify-transmit-fifo-size.patch
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