From 5063e2c567ee569cccfc01ebf80c898cb4e6833a Mon Sep 17 00:00:00 2001 From: Russell King Date: Wed, 22 Dec 2010 17:09:08 +0000 Subject: [PATCH] ARM: PL011: Ensure error flags are clear at startup The error flags weren't being cleared upon UART startup, which can cause problems when we add DMA support. It's good practice to ensure that these flags are cleared anyway, so let's do so. This was part of a larger patch from Linus Walleij. Acked-by: Linus Walleij Signed-off-by: Russell King --- drivers/serial/amba-pl011.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c index 2c07939be02c..c77b3eb5142d 100644 --- a/drivers/serial/amba-pl011.c +++ b/drivers/serial/amba-pl011.c @@ -424,6 +424,10 @@ static int pl011_startup(struct uart_port *port) cr = UART01x_CR_UARTEN | UART011_CR_RXE | UART011_CR_TXE; writew(cr, uap->port.membase + UART011_CR); + /* Clear pending error interrupts */ + writew(UART011_OEIS | UART011_BEIS | UART011_PEIS | UART011_FEIS, + uap->port.membase + UART011_ICR); + /* * initialise the old status of the modem signals */ -- 2.20.1