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Message-Id: <20220510130734.392563510@linuxfoundation.org>
Date: Tue, 10 May 2022 15:07:07 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Chuanhong Guo <gch981213@...il.com>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 22/88] mtd: rawnand: fix ecc parameters for mt7622
From: Chuanhong Guo <gch981213@...il.com>
[ Upstream commit 9fe4e0d3cbfe90152137963cc024ecb63db6e8e6 ]
According to the datasheet, mt7622 only has 5 ECC capabilities instead
of 7, and the decoding error register is arranged as follows:
+------+---------+---------+---------+---------+
| Bits | 19:15 | 14:10 | 9:5 | 4:0 |
+------+---------+---------+---------+---------+
| Name | ERRNUM3 | ERRNUM2 | ERRNUM1 | ERRNUM0 |
+------+---------+---------+---------+---------+
This means err_mask should be 0x1f instead of 0x3f and the number of
bits shifted in mtk_ecc_get_stats should be 5 instead of 8.
This commit introduces err_shift for the difference in this register
and fix other existing parameters.
Public MT7622 reference manual can be found on [0] and the info this
commit is based on is from page 656 and page 660.
[0]: https://wiki.banana-pi.org/Banana_Pi_BPI-R64#Documents
Fixes: 98dea8d71931 ("mtd: nand: mtk: Support MT7622 NAND flash controller.")
Signed-off-by: Chuanhong Guo <gch981213@...il.com>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Link: https://lore.kernel.org/linux-mtd/20220402160315.919094-1-gch981213@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/mtd/nand/raw/mtk_ecc.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/mtd/nand/raw/mtk_ecc.c b/drivers/mtd/nand/raw/mtk_ecc.c
index 6432bd70c3b3..9e4a78a80802 100644
--- a/drivers/mtd/nand/raw/mtk_ecc.c
+++ b/drivers/mtd/nand/raw/mtk_ecc.c
@@ -51,6 +51,7 @@
struct mtk_ecc_caps {
u32 err_mask;
+ u32 err_shift;
const u8 *ecc_strength;
const u32 *ecc_regs;
u8 num_ecc_strength;
@@ -84,7 +85,7 @@ static const u8 ecc_strength_mt2712[] = {
};
static const u8 ecc_strength_mt7622[] = {
- 4, 6, 8, 10, 12, 14, 16
+ 4, 6, 8, 10, 12
};
enum mtk_ecc_regs {
@@ -229,7 +230,7 @@ void mtk_ecc_get_stats(struct mtk_ecc *ecc, struct mtk_ecc_stats *stats,
for (i = 0; i < sectors; i++) {
offset = (i >> 2) << 2;
err = readl(ecc->regs + ECC_DECENUM0 + offset);
- err = err >> ((i % 4) * 8);
+ err = err >> ((i % 4) * ecc->caps->err_shift);
err &= ecc->caps->err_mask;
if (err == ecc->caps->err_mask) {
/* uncorrectable errors */
@@ -453,6 +454,7 @@ EXPORT_SYMBOL(mtk_ecc_get_parity_bits);
static const struct mtk_ecc_caps mtk_ecc_caps_mt2701 = {
.err_mask = 0x3f,
+ .err_shift = 8,
.ecc_strength = ecc_strength_mt2701,
.ecc_regs = mt2701_ecc_regs,
.num_ecc_strength = 20,
@@ -463,6 +465,7 @@ static const struct mtk_ecc_caps mtk_ecc_caps_mt2701 = {
static const struct mtk_ecc_caps mtk_ecc_caps_mt2712 = {
.err_mask = 0x7f,
+ .err_shift = 8,
.ecc_strength = ecc_strength_mt2712,
.ecc_regs = mt2712_ecc_regs,
.num_ecc_strength = 23,
@@ -472,10 +475,11 @@ static const struct mtk_ecc_caps mtk_ecc_caps_mt2712 = {
};
static const struct mtk_ecc_caps mtk_ecc_caps_mt7622 = {
- .err_mask = 0x3f,
+ .err_mask = 0x1f,
+ .err_shift = 5,
.ecc_strength = ecc_strength_mt7622,
.ecc_regs = mt7622_ecc_regs,
- .num_ecc_strength = 7,
+ .num_ecc_strength = 5,
.ecc_mode_shift = 4,
.parity_bits = 13,
.pg_irq_sel = 0,
--
2.35.1
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