From: Martyn Welch Date: Wed, 4 Oct 2017 16:13:27 +0000 (+0100) Subject: serial: imx: Correct comment imx_flush_buffer() X-Git-Tag: v4.15-rc1~141^2~66 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=263763c1c5235b01b654b954d4a278c8cf5a0def;p=linux.git 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 Acked-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- 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);