linux-kernel - [PATCH v2] mtd: rawnand: meson: fix bitmask for length in command word

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Date:   Wed, 29 Mar 2023 10:47:26 +0300
From:   Arseniy Krasnov <avkrasnov@...rdevices.ru>
To:     Liang Yang <liang.yang@...ogic.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Yixun Lan <yixun.lan@...ogic.com>
CC:     <linux-mtd@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kernel@...rdevices.ru>,
        <oxffffaa@...il.com>
Subject: [PATCH v2] mtd: rawnand: meson: fix bitmask for length in command
 word

Valid mask is 0x3FFF, without this patch the following problems were
found:

1) [    0.938914] Could not find a valid ONFI parameter page, trying
                  bit-wise majority to recover it
   [    0.947384] ONFI parameter recovery failed, aborting

2) Read with disabled ECC mode was broken.

Fixes: 8fae856c5350 ("mtd: rawnand: meson: add support for Amlogic NAND flash controller")
Cc: <Stable@...r.kernel.org>
Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
---
 drivers/mtd/nand/raw/meson_nand.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
index a28574c00900..074e14225c06 100644
--- a/drivers/mtd/nand/raw/meson_nand.c
+++ b/drivers/mtd/nand/raw/meson_nand.c
@@ -280,7 +280,7 @@ static void meson_nfc_cmd_access(struct nand_chip *nand, int raw, bool dir,
 
 	if (raw) {
 		len = mtd->writesize + mtd->oobsize;
-		cmd = (len & GENMASK(5, 0)) | scrambler | DMA_DIR(dir);
+		cmd = (len & GENMASK(13, 0)) | scrambler | DMA_DIR(dir);
 		writel(cmd, nfc->reg_base + NFC_REG_CMD);
 		return;
 	}
@@ -544,7 +544,7 @@ static int meson_nfc_read_buf(struct nand_chip *nand, u8 *buf, int len)
 	if (ret)
 		goto out;
 
-	cmd = NFC_CMD_N2M | (len & GENMASK(5, 0));
+	cmd = NFC_CMD_N2M | (len & GENMASK(13, 0));
 	writel(cmd, nfc->reg_base + NFC_REG_CMD);
 
 	meson_nfc_drain_cmd(nfc);
@@ -568,7 +568,7 @@ static int meson_nfc_write_buf(struct nand_chip *nand, u8 *buf, int len)
 	if (ret)
 		return ret;
 
-	cmd = NFC_CMD_M2N | (len & GENMASK(5, 0));
+	cmd = NFC_CMD_M2N | (len & GENMASK(13, 0));
 	writel(cmd, nfc->reg_base + NFC_REG_CMD);
 
 	meson_nfc_drain_cmd(nfc);
-- 
2.35.0