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authorRussell King <rmk+kernel@arm.linux.org.uk>2010-12-22 17:09:08 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-01-05 16:58:42 +0000
commit5063e2c567ee569cccfc01ebf80c898cb4e6833a (patch)
tree4468b5aa67354b8393a0980fc9dda12a226e5fd3
parente8a7ba86ff993311f8712e5b3bb2e3892e82df5f (diff)
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 <linus.walleij@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--drivers/serial/amba-pl011.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index 2c07939be02..c77b3eb5142 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
*/