Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 855f6fd9 authored by John Linn's avatar John Linn Committed by Greg Kroah-Hartman
Browse files

Xilinx: ARM: UART: clear pending irqs before enabling irqs 



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.

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.

[s.trumtrar@pengutronix.de: cherry-picked from linux-xlnx.git]
Signed-off-by: default avatarSteffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9326b047

drivers/tty/serial/xilinx_uartps.c

+2 −0
Original line number Diff line number Diff line
@@ -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 |