tty: xuartps: Clear interrupt status register in shutdown

When shutting down the UART, clear the interrupt status register. Bits
in the ISR are cleared by writing them as '1'.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Reviewed-by: Moritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 6a7cd4e057aee6d7788e08f02a358b55515771b4..ef114d7a0623bcc2cf19a6618eb53b48b9be97ec 100644 (file)
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -828,6 +828,7 @@ static void cdns_uart_shutdown(struct uart_port *port)
        /* Disable interrupts */
        status = readl(port->membase + CDNS_UART_IMR_OFFSET);
        writel(status, port->membase + CDNS_UART_IDR_OFFSET);
+       writel(0xffffffff, port->membase + CDNS_UART_ISR_OFFSET);
 
        /* Disable the TX and RX */
        writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS,