mtd: rawnand: hynix: don't try read-retry on SLC NANDs

Some SLC NANDs like H27U4G8F2D expose a valid JEDEC ID yet they don't
support the read-retry mechanism, and fail.
Since SLC NANDs don't require read-retry, continue only if the bits per
cell is bigger than 1.

Signed-off-by: Hector Palacios <hector.palacios@digi.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

Author: hpalacio

drivers/mtd/nand/raw/nand_hynix.c

@@ -377,9 +377,9 @@ static int hynix_nand_rr_init(struct nand_chip *chip)
 
 	/*
 	 * We only support read-retry for 1xnm NANDs, and those NANDs all
-	 * expose a valid JEDEC ID.
+	 * expose a valid JEDEC ID. SLC NANDs don't require read-retry.
 	 */
-	if (valid_jedecid) {
+	if (valid_jedecid && nanddev_bits_per_cell(&chip->base) > 1) {
 		u8 nand_tech = chip->id.data[5] >> 4;
 
 		/* 1xnm technology */