[PATCH v2 4/7] mtd: rawnand: brcmnand: Fix mtd oobsize

[Linus Walleij]

From: William Zhang <william.zhang at broadcom.com>

Backport from upstream Linux
commit 60177390fa061c62d156f4a546e3efd90df3c183
"mtd: rawnand: brcmnand: Fix mtd oobsize"

brcmnand controller can only access the flash spare area up to certain
bytes based on the ECC level. It can be less than the actual flash spare
area size. For example, for many NAND chip supporting ECC BCH-8, it has
226 bytes spare area. But controller can only uses 218 bytes. So brcmand
driver overrides the mtd oobsize with the controller's accessible spare
area size. When the nand base driver utilizes the nand_device object, it
resets the oobsize back to the actual flash spare aprea size from
nand_memory_organization structure and controller may not able to access
all the oob area as mtd advises.

This change fixes the issue by overriding the oobsize in the
nand_memory_organization structure to the controller's accessible spare
area size.

Fixes: a7ab085d7c16 ("mtd: rawnand: Initialize the nand_device object")
Signed-off-by: William Zhang <william.zhang at broadcom.com>
Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230706182909.79151-6-william.zhang@broadcom.com
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
---
 drivers/mtd/nand/raw/brcmnand/brcmnand.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
index 60d34bd21f53..552b239b95ae 100644
--- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
@@ -25,6 +25,7 @@
 #include <linux/completion.h>
 #include <linux/errno.h>
 #include <linux/log2.h>
+#include <linux/mtd/nand.h>
 #include <linux/mtd/rawnand.h>
 #include <asm/processor.h>
 #include <dm.h>
@@ -2304,6 +2305,8 @@ static int brcmnand_setup_dev(struct brcmnand_host *host)
 {
 	struct mtd_info *mtd = nand_to_mtd(&host->chip);
 	struct nand_chip *chip = &host->chip;
+	struct nand_device *nanddev = mtd_to_nanddev(mtd);
+	struct nand_memory_organization *memorg = nanddev_get_memorg(nanddev);
 	struct brcmnand_controller *ctrl = host->ctrl;
 	struct brcmnand_cfg *cfg = &host->hwcfg;
 	char msg[128];
@@ -2331,10 +2334,11 @@ static int brcmnand_setup_dev(struct brcmnand_host *host)
 	if (cfg->spare_area_size > ctrl->max_oob)
 		cfg->spare_area_size = ctrl->max_oob;
 	/*
-	 * Set oobsize to be consistent with controller's spare_area_size, as
-	 * the rest is inaccessible.
+	 * Set mtd and memorg oobsize to be consistent with controller's
+	 * spare_area_size, as the rest is inaccessible.
 	 */
 	mtd->oobsize = cfg->spare_area_size * (mtd->writesize >> FC_SHIFT);
+	memorg->oobsize = mtd->oobsize;
 
 	cfg->device_size = mtd->size;
 	cfg->block_size = mtd->erasesize;

-- 
2.46.0