usb: gadget: s3c-hsotg: fix s3c_hsotg_write_fifo function for dedicated fifo mode

In s3c_hsotg_write_fifo function PTxFEmp/NPTxFEmp interrupts are enabled
only in shared-fifo mode. In dedicated-fifo mode they should not be used
(when enabled then cause interrupt storm).
Signed-off-by: NRobert Baldyga <r.baldyga@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/gadget/s3c-hsotg.c

@@ -563,6 +563,8 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
 	if (to_write > max_transfer) {
 		to_write = max_transfer;
 
+		/* it's needed only when we do not use dedicated fifos */
+		if (!hsotg->dedicated_fifos)
 			s3c_hsotg_en_gsint(hsotg,
 					   periodic ? GINTSTS_PTxFEmp :
 					   GINTSTS_NPTxFEmp);
@@ -590,6 +592,8 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
 		 * is more room left.
 		 */
 
+		/* it's needed only when we do not use dedicated fifos */
+		if (!hsotg->dedicated_fifos)
 			s3c_hsotg_en_gsint(hsotg,
 					   periodic ? GINTSTS_PTxFEmp :
 					   GINTSTS_NPTxFEmp);