phy: rockchip-inno-usb2: Do not lock in bvalid IRQ handler

Clearing the IRQ is atomic, so there is no need to hold the mutex.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Tested-by: Michael Riesch <michael.riesch@wolfvision.net>
Link: https://lore.kernel.org/r/20220414032258.40984-4-samuel@sholland.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/rockchip/phy-rockchip-inno-usb2.c

@@ -905,13 +905,9 @@ static irqreturn_t rockchip_usb2phy_bvalid_irq(int irq, void *data)
 	if (!property_enabled(rphy->grf, &rport->port_cfg->bvalid_det_st))
 		return IRQ_NONE;
 
-	mutex_lock(&rport->mutex);
-
 	/* clear bvalid detect irq pending status */
 	property_enable(rphy->grf, &rport->port_cfg->bvalid_det_clr, true);
 
-	mutex_unlock(&rport->mutex);
-
 	rockchip_usb2phy_otg_sm_work(&rport->otg_sm_work.work);
 
 	return IRQ_HANDLED;