From: John Linn <john.linn@xxxxxxxxxx> The Boot ROM has an issue which will cause the driver to lock up as pending irqs are not being cleared. With them cleared it prevents that issue. [s.trumtrar@xxxxxxxxxxxxxx: cherry-picked from linux-xlnx.git] Signed-off-by: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- This patch is needed for the current (3.9-rc3) mainline kernel. I guess it went unnoticed, because it was only tested with u-boot up until now. And u-boot maybe handles this. drivers/tty/serial/xilinx_uartps.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index ba451c7..f36bbba 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -578,6 +578,8 @@ static int xuartps_startup(struct uart_port *port) /* Receive Timeout register is enabled with value of 10 */ xuartps_writel(10, XUARTPS_RXTOUT_OFFSET); + /* Clear out any pending interrupts before enabling them */ + xuartps_writel(xuartps_readl(XUARTPS_ISR_OFFSET), XUARTPS_ISR_OFFSET); /* Set the Interrupt Registers with desired interrupts */ xuartps_writel(XUARTPS_IXR_TXEMPTY | XUARTPS_IXR_PARITY | -- 1.8.2.rc2 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
