usb: musb: ignore spurious SESSREQ interrupts

This will ignore any SESSREQ interrupt if musb is B state.
Charger detection may cause spurious SESSREQ interrupts.

Signed-off-by: Heikki Krogerus <ext-heikki.krogerus@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index d4f18bbc8f8..472b2a7e789 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -550,6 +550,11 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
         if (int_usb & MUSB_INTR_SESSREQ) {
                 void __iomem *mbase = musb->mregs;
 
+                if (devctl & MUSB_DEVCTL_BDEVICE) {
+                        DBG(3, "SessReq while on B state\n");
+                        return IRQ_HANDLED;
+                }
+
                 DBG(1, "SESSION_REQUEST (%s)\n", otg_state_string(musb));
 
                 /* IRQ arrives from ID pin sense or (later, if VBUS power