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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-12-22 17:09:08 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-01-05 16:58:42 +0000 |
| commit | 5063e2c567ee569cccfc01ebf80c898cb4e6833a (patch) | |
| tree | 4468b5aa67354b8393a0980fc9dda12a226e5fd3 | |
| parent | e8a7ba86ff993311f8712e5b3bb2e3892e82df5f (diff) | |
| download | linux-3.10-5063e2c567ee569cccfc01ebf80c898cb4e6833a.tar.gz linux-3.10-5063e2c567ee569cccfc01ebf80c898cb4e6833a.tar.bz2 linux-3.10-5063e2c567ee569cccfc01ebf80c898cb4e6833a.zip | |
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.c | 4 |
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 */ |