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generic: import patch lowering bitflip_threshold on SPI-NAND

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Reporting an unclean read from SPI-NAND only when the maximum number
of correctable bitflip errors has been hit seems a bit late.
UBI LEB scrubbing, which depends on the lower MTD device reporting
correctable bitflips, then only kicks in when it's almost too late.

Set bitflip_threshold to 75% of the ECC strength, which is also the
default for raw NAND.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2024-08-12 03:06:14 +01:00
parent c22ba7544e
commit 1554af4c43
2 changed files with 66 additions and 3 deletions
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63
target/linux/generic/pending-6.6/410-mtd-spinand-set-bitflip_threshold-to-75-of-ECC-strength.patch Normal file
View File

@ -0,0 +1,63 @@
From patchwork Mon Aug 12 01:56:41 2024
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Date: Mon, 12 Aug 2024 02:56:41 +0100
From: Daniel Golle <daniel@makrotopia.org>
To: Miquel Raynal <miquel.raynal@bootlin.com>,
Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>,
Tudor Ambarus <tudor.ambarus@linaro.org>,
Daniel Golle <daniel@makrotopia.org>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Chia-Lin Kao <acelan.kao@canonical.com>,
Martin Kurbanov <mmkurbanov@salutedevices.com>,
linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH] mtd: spinand: set bitflip_threshold to 75% of ECC strength
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Reporting an unclean read from SPI-NAND only when the maximum number
of correctable bitflip errors has been hit seems a bit late.
UBI LEB scrubbing, which depends on the lower MTD device reporting
correctable bitflips, then only kicks in when it's almost too late.
Set bitflip_threshold to 75% of the ECC strength, which is also the
default for raw NAND.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
drivers/mtd/nand/spi/core.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -1286,6 +1286,7 @@ static int spinand_init(struct spinand_d
/* Propagate ECC information to mtd_info */
mtd->ecc_strength = nanddev_get_ecc_conf(nand)->strength;
mtd->ecc_step_size = nanddev_get_ecc_conf(nand)->step_size;
+ mtd->bitflip_threshold = DIV_ROUND_UP(mtd->ecc_strength * 3, 4);
ret = spinand_create_dirmaps(spinand);
if (ret) {

6
target/linux/mediatek/patches-6.6/330-snand-mtk-bmt-support.patch
View File

@ -8,7 +8,7 @@
static int spinand_read_reg_op(struct spinand_device *spinand, u8 reg, u8 *val)
{
@@ -1345,6 +1346,7 @@ static int spinand_probe(struct spi_mem
@@ -1346,6 +1347,7 @@ static int spinand_probe(struct spi_mem
if (ret)
return ret;
@ -16,7 +16,7 @@
ret = mtd_device_register(mtd, NULL, 0);
if (ret)
goto err_spinand_cleanup;
@@ -1352,6 +1354,7 @@ static int spinand_probe(struct spi_mem
@@ -1353,6 +1355,7 @@ static int spinand_probe(struct spi_mem
return 0;
err_spinand_cleanup:
@ -24,7 +24,7 @@
spinand_cleanup(spinand);
return ret;
@@ -1370,6 +1373,7 @@ static int spinand_remove(struct spi_mem
@@ -1371,6 +1374,7 @@ static int spinand_remove(struct spi_mem
if (ret)
return ret;