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@xxxxxxxxxxxxx>
---
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
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