usb:hsotg:samsung: Remove Disconnect Interrupt handler

The USB Disconnect Interrupt handler, according to specification,
is only working at HOST mode.

Samsung SoCs (e.g. Exynos4) are working at device mode, so
this interrupt is never caught.
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/s3c-hsotg.c

@@ -2211,12 +2211,11 @@ static void s3c_hsotg_core_init(struct s3c_hsotg *hsotg)
 	/* Clear any pending interrupts */
 	writel(0xffffffff, hsotg->regs + S3C_GINTSTS);
 
-	writel(S3C_GINTSTS_DisconnInt | S3C_GINTSTS_SessReqInt |
+	writel(S3C_GINTSTS_ErlySusp | S3C_GINTSTS_SessReqInt |
 	       S3C_GINTSTS_GOUTNakEff | S3C_GINTSTS_GINNakEff |
 	       S3C_GINTSTS_ConIDStsChng | S3C_GINTSTS_USBRst |
 	       S3C_GINTSTS_EnumDone | S3C_GINTSTS_OTGInt |
-	       S3C_GINTSTS_USBSusp | S3C_GINTSTS_WkUpInt |
-	       S3C_GINTSTS_ErlySusp,
+	       S3C_GINTSTS_USBSusp | S3C_GINTSTS_WkUpInt,
 	       hsotg->regs + S3C_GINTMSK);
 
 	if (using_dma(hsotg))
@@ -2339,13 +2338,6 @@ static irqreturn_t s3c_hsotg_irq(int irq, void *pw)
 		writel(otgint, hsotg->regs + S3C_GOTGINT);
 	}
 
-	if (gintsts & S3C_GINTSTS_DisconnInt) {
-		dev_dbg(hsotg->dev, "%s: DisconnInt\n", __func__);
-		writel(S3C_GINTSTS_DisconnInt, hsotg->regs + S3C_GINTSTS);
-
-		s3c_hsotg_disconnect_irq(hsotg);
-	}
-
 	if (gintsts & S3C_GINTSTS_SessReqInt) {
 		dev_dbg(hsotg->dev, "%s: SessReqInt\n", __func__);
 		writel(S3C_GINTSTS_SessReqInt, hsotg->regs + S3C_GINTSTS);