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usb: atmel_usba_udc: Mask status with enabled irqs

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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>
This commit is contained in:
Boris Brezillon 2015-01-06 14:47:01 +01:00 committed by Felipe Balbi
parent 258e2ddd63
commit 9870d895ad
1 changed files with 5 additions and 1 deletions
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6
drivers/usb/gadget/udc/atmel_usba_udc.c
View file

@ -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");
}