usb: gadget: net2280: check interrupts for all endpoints

USB3380 in enhanced mode has 4 IN and 4 OUT endpoints. Check
interrupts for all of them.
Tested-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/udc/net2280.c

@@ -2883,6 +2883,26 @@ static void handle_stat0_irqs_superspeed(struct net2280 *dev,
 	return;
 }
 
+static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
+{
+	u32 index;
+	u32 bit;
+
+	for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
+		bit = BIT(ep_bit[index]);
+
+		if (!stat0)
+			break;
+
+		if (!(stat0 & bit))
+			continue;
+
+		stat0 &= ~bit;
+
+		handle_ep_small(&dev->ep[index]);
+	}
+}
+
 static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
 {
 	struct net2280_ep	*ep;
@@ -3107,6 +3127,16 @@ static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
 #undef	w_length
 
 next_endpoints:
+	if ((dev->quirks & PLX_SUPERSPEED) && dev->enhanced_mode) {
+		u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
+			USB3380_IRQSTAT0_EP_INTR_MASK_IN |
+			USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
+
+		if (stat & mask) {
+			usb338x_handle_ep_intr(dev, stat & mask);
+			stat &= ~mask;
+		}
+	} else {
 		/* endpoint data irq ? */
 		scratch = stat & 0x7f;
 		stat &= ~0x7f;
@@ -3122,6 +3152,7 @@ static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
 			ep = &dev->ep[num];
 			handle_ep_small(ep);
 		}
+	}
 
 	if (stat)
 		ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);

include/linux/usb/net2280.h

@@ -168,6 +168,9 @@ struct net2280_regs {
 #define     ENDPOINT_B_INTERRUPT                                2
 #define     ENDPOINT_A_INTERRUPT                                1
 #define     ENDPOINT_0_INTERRUPT                                0
+#define     USB3380_IRQSTAT0_EP_INTR_MASK_IN (0xF << 17)
+#define     USB3380_IRQSTAT0_EP_INTR_MASK_OUT (0xF << 1)
+
 	u32		irqstat1;
 #define     POWER_STATE_CHANGE_INTERRUPT                        27
 #define     PCI_ARBITER_TIMEOUT_INTERRUPT                       26