From 9764e7a0f63bda5664cb985f992002c6eccef641 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Tue, 17 Mar 2015 00:28:47 +0100 Subject: [PATCH] sc16is7xx: don't wipe out port configuration on shutdown EFCR register contains RS-485 configuration which should not be changed by shutdown. Instead of doing a write only update the appropriate bits. Signed-off-by: Jakub Kicinski Signed-off-by: Jon Ringle Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sc16is7xx.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index 11bb44039a57..e6b396e584f3 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -903,9 +903,11 @@ static void sc16is7xx_shutdown(struct uart_port *port) /* Disable all interrupts */ sc16is7xx_port_write(port, SC16IS7XX_IER_REG, 0); /* Disable TX/RX */ - sc16is7xx_port_write(port, SC16IS7XX_EFCR_REG, - SC16IS7XX_EFCR_RXDISABLE_BIT | - SC16IS7XX_EFCR_TXDISABLE_BIT); + sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG, + SC16IS7XX_EFCR_RXDISABLE_BIT | + SC16IS7XX_EFCR_TXDISABLE_BIT, + SC16IS7XX_EFCR_RXDISABLE_BIT | + SC16IS7XX_EFCR_TXDISABLE_BIT); sc16is7xx_power(port, 0); }