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Commit 2fe605df authored by Yuan Yao's avatar Yuan Yao Committed by Greg Kroah-Hartman
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serial: fsl-lpuart: disable interrupt when suspend 



For power management support, we should disable TX and
TX interrupt so that kernel can prepare for deep sleep.

Retain RX and RX interrupt for wakeup the kernel when
receive the input character.

Signed-off-by: default avatarYuan Yao <yao.yuan@freescale.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 011f5bde

drivers/tty/serial/fsl_lpuart.c

+13 −0
Original line number Original line Diff line number Diff line
@@ -1846,6 +1846,19 @@ static int lpuart_remove(struct platform_device *pdev) 
static int lpuart_suspend(struct device *dev)

static int lpuart_suspend(struct device *dev)

{

{

	struct lpuart_port *sport = dev_get_drvdata(dev);

	struct lpuart_port *sport = dev_get_drvdata(dev);

	unsigned long temp;



	if (sport->lpuart32) {

		/* disable Rx/Tx and interrupts */

		temp = lpuart32_read(sport->port.membase + UARTCTRL);

		temp &= ~(UARTCTRL_TE | UARTCTRL_TIE | UARTCTRL_TCIE);

		lpuart32_write(temp, sport->port.membase + UARTCTRL);

	} else {

		/* disable Rx/Tx and interrupts */

		temp = readb(sport->port.membase + UARTCR2);

		temp &= ~(UARTCR2_TE | UARTCR2_TIE | UARTCR2_TCIE);

		writeb(temp, sport->port.membase + UARTCR2);

	}





	uart_suspend_port(&lpuart_reg, &sport->port);

	uart_suspend_port(&lpuart_reg, &sport->port);