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tty: serial: fsl_lpuart: specify transmit FIFO size

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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@agner.ch>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stefan Agner 2015-03-13 14:51:50 +01:00 committed by Greg Kroah-Hartman
parent e91d863d1a
commit 4e8f245937
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serial/fsl_lpuart.c
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@ -1076,6 +1076,8 @@ static int lpuart_startup(struct uart_port *port)
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);