usb: atmel_usba_udc: Mask status with enabled irqs

Avoid interpreting useless status flags when we're not waiting for such
events by masking the status variable with the interrupt enabled register
value.

Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Reported-by: Patrice VILCHEZ <patrice.vilchez@atmel.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c
index 55c8dde..bc3a532 100644 (file)
--- a/drivers/usb/gadget/udc/atmel_usba_udc.c
+++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
@@ -1612,12 +1612,14 @@ static irqreturn_t usba_udc_irq(int irq, void *devid)
 
        spin_lock(&udc->lock);
 
-       status = usba_readl(udc, INT_STA);
+       status = usba_readl(udc, INT_STA) & usba_readl(udc, INT_ENB);
        DBG(DBG_INT, "irq, status=%#08x\n", status);
 
        if (status & USBA_DET_SUSPEND) {
                toggle_bias(udc, 0);
                usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
+               usba_writel(udc, INT_ENB,
+                           usba_readl(udc, INT_ENB) | USBA_WAKE_UP);
                udc->bias_pulse_needed = true;
                DBG(DBG_BUS, "Suspend detected\n");
                if (udc->gadget.speed != USB_SPEED_UNKNOWN
@@ -1631,6 +1633,8 @@ static irqreturn_t usba_udc_irq(int irq, void *devid)
        if (status & USBA_WAKE_UP) {
                toggle_bias(udc, 1);
                usba_writel(udc, INT_CLR, USBA_WAKE_UP);
+               usba_writel(udc, INT_ENB,
+                           usba_readl(udc, INT_ENB) & ~USBA_WAKE_UP);
                DBG(DBG_BUS, "Wake Up CPU detected\n");
        }