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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>
This commit is contained in:
Soren Brinkmann 2015-12-26 02:43:52 -08:00 committed by Greg Kroah-Hartman
parent ea8dd8e585
commit aea8f3ddcf
1 changed files with 1 additions and 0 deletions
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1
drivers/tty/serial/xilinx_uartps.c
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@ -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,