mtd: rawnand: Give more information about the ECC weakness

When the ECC strength is too weak compared to the NAND chip
requirements, display the values so that it is clear for people how
much they are far from the requirements (and might get in troubles in
the future).
Signed-off-by: NMiquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200421163906.7515-1-miquel.raynal@bootlin.com

drivers/mtd/nand/raw/nand_base.c

@@ -5781,8 +5781,10 @@ static int nand_scan_tail(struct nand_chip *chip)
 
 	/* ECC sanity check: warn if it's too weak */
 	if (!nand_ecc_strength_good(chip))
-		pr_warn("WARNING: %s: the ECC used on your system is too weak compared to the one required by the NAND chip\n",
-			mtd->name);
+		pr_warn("WARNING: %s: the ECC used on your system (%db/%dB) is too weak compared to the one required by the NAND chip (%db/%dB)\n",
+			mtd->name, chip->ecc.strength, chip->ecc.size,
+			chip->base.eccreq.strength,
+			chip->base.eccreq.step_size);
 
 	/* Allow subpage writes up to ecc.steps. Not possible for MLC flash */
 	if (!(chip->options & NAND_NO_SUBPAGE_WRITE) && nand_is_slc(chip)) {