diff options
| author | Martyn Welch <martyn.welch@collabora.co.uk> | 2017-10-04 17:13:27 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-20 13:57:37 +0200 |
| commit | 263763c1c5235b01b654b954d4a278c8cf5a0def (patch) | |
| tree | cd6bd8c310f1732777fca5dd7843fcc224c24e02 /drivers/tty | |
| parent | 9424e8b1fedbaff34df187fdb87f9a9cba2d0ff2 (diff) | |
serial: imx: Correct comment imx_flush_buffer()
The comment in imx_flush_buffer() states that the state of 4 registers
are to be saved/restored, then only saves and restores 3 registers. The
missing register (UBRC) is read only and thus can't be restored.
Update the comment to reflect reality.
Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/imx.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index b697c1eefa74..76818a266403 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1417,10 +1417,14 @@ static void imx_flush_buffer(struct uart_port *port) /* * According to the Reference Manual description of the UART SRST bit: + * * "Reset the transmit and receive state machines, * all FIFOs and register USR1, USR2, UBIR, UBMR, UBRC, URXD, UTXD - * and UTS[6-3]". As we don't need to restore the old values from - * USR1, USR2, URXD, UTXD, only save/restore the other four registers + * and UTS[6-3]". + * + * We don't need to restore the old values from USR1, USR2, URXD and + * UTXD. UBRC is read only, so only save/restore the other three + * registers. */ ubir = readl(sport->port.membase + UBIR); ubmr = readl(sport->port.membase + UBMR); |