mtd: nand: Samsung MLC - new OOB sizes

There are some additions to the detection scheme used by Samsung
MLC NAND. These simple changes to support the 400- and 436-byte OOB
are found in the following data sheet:

Samsung K9GBG08U0M (p.40)
Signed-off-by: Brian Norris <norris@broadcom.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/nand/nand_base.c

@@ -2859,7 +2859,7 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
 		/*
 		 * Field definitions are in the following datasheets:
 		 * Old style (4,5 byte ID): Samsung K9GAG08U0M (p.32)
-		 * New style   (6 byte ID): Samsung K9GAG08U0D (p.40)
+		 * New style   (6 byte ID): Samsung K9GBG08U0M (p.40)
 		 *
 		 * Check for wraparound + Samsung ID + nonzero 6th byte
 		 * to decide what to do.
@@ -2872,7 +2872,20 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
 			mtd->writesize = 2048 << (extid & 0x03);
 			extid >>= 2;
 			/* Calc oobsize */
-			mtd->oobsize = (extid & 0x03) == 0x01 ? 128 : 218;
+			switch (extid & 0x03) {
+			case 1:
+				mtd->oobsize = 128;
+				break;
+			case 2:
+				mtd->oobsize = 218;
+				break;
+			case 3:
+				mtd->oobsize = 400;
+				break;
+			default:
+				mtd->oobsize = 436;
+				break;
+			}
 			extid >>= 2;
 			/* Calc blocksize */
 			mtd->erasesize = (128 * 1024) <<