mtd: fsl_ifc_nand: Workaround bogus WP on 16-bit NAND

A workaround was already in place that set the WP bit in the
IFC_CSPR0 register after a STATUS command, however it used an 8-bit
write method. As a result, the WP bit was never set on 16-bit devices,
and these devices would eventually be incorrectly marked as
write-protected.

This patch checks the chip options for a 16-bit device and uses the
appropriate write method to set the WP bit after a STATUS command.

Signed-off-by: Joe Schultz <jschultz@xes-inc.com>
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

drivers/mtd/nand/fsl_ifc_nand.c

@@ -591,7 +591,10 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 		 * The chip always seems to report that it is
 		 * write-protected, even when it is not.
 		 */
-		setbits8(ifc_nand_ctrl->addr, NAND_STATUS_WP);
+		if (chip->options & NAND_BUSWIDTH_16)
+			setbits16(ifc_nand_ctrl->addr, NAND_STATUS_WP);
+		else
+			setbits8(ifc_nand_ctrl->addr, NAND_STATUS_WP);
 		return;
 
 	case NAND_CMD_RESET: