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Date: Wed, 21 Jan 2015 16:32:10 +0800 From: Yuan Yao <yao.yuan@...escale.com> To: <gregkh@...uxfoundation.org>, <shawn.guo@...aro.org>, <jslaby@...e.cz> CC: <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <linux-serial@...r.kernel.org> Subject: [PATCH] serial: fsl-lpuart: disable interrupt when suspend For power management support, we should disable TX/RX interrupts so that kernel can prepare for deep sleep. Signed-off-by: Yuan Yao <yao.yuan@...escale.com> --- drivers/tty/serial/fsl_lpuart.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 1c5d020..bfd6ea2 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -1449,6 +1449,21 @@ static int lpuart_remove(struct platform_device *pdev) static int lpuart_suspend(struct device *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_RE | + UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE); + lpuart32_write(temp, sport->port.membase + UARTCTRL); + } else { + /* disable Rx/Tx and interrupts */ + temp = readb(sport->port.membase + UARTCR2); + temp &= ~(UARTCR2_TE | UARTCR2_RE | + UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_RIE); + writeb(temp, sport->port.membase + UARTCR2); + } uart_suspend_port(&lpuart_reg, &sport->port); -- 2.1.0.27.g96db324 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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