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6bb51c9d1c
This backports a fix proposed for upstream kernel to fix overwriting the NAND ECC engine in device tree. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
69 lines
2.9 KiB
Diff
69 lines
2.9 KiB
Diff
From ae9a2ac4d283b2925a97523a05ea024499329c16 Mon Sep 17 00:00:00 2001
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From: Miquel Raynal <miquel.raynal@bootlin.com>
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Date: Wed, 29 Sep 2021 00:22:58 +0200
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Subject: [PATCH] mtd: rawnand: xway: Keep the driver compatible with on-die
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ECC engines
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Following the introduction of the generic ECC engine infrastructure, it
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was necessary to reorganize the code and move the ECC configuration in
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the ->attach_chip() hook. Failing to do that properly lead to a first
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series of fixes supposed to stabilize the situation. Unfortunately, this
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only fixed the use of software ECC engines, preventing any other kind of
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engine to be used, including on-die ones.
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It is now time to (finally) fix the situation by ensuring that we still
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provide a default (eg. software ECC) but will still support different
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ECC engines such as on-die ECC engines if properly described in the
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device tree.
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There are no changes needed on the core side in order to do this, but we
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just need to leverage the logic there which allows:
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1- a subsystem default (set to Host engines in the raw NAND world)
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2- a driver specific default (here set to software ECC engines)
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3- any type of engine requested by the user (ie. described in the DT)
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As the raw NAND subsystem has not yet been fully converted to the ECC
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engine infrastructure, in order to provide a default ECC engine for this
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driver we need to set chip->ecc.engine_type *before* calling
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nand_scan(). During the initialization step, the core will consider this
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entry as the default engine for this driver. This value may of course
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be overloaded by the user if the usual DT properties are provided.
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Fixes: d525914b5bd8 ("mtd: rawnand: xway: Move the ECC initialization to ->attach_chip()")
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Cc: stable@vger.kernel.org
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Cc: Jan Hoffmann <jan@3e8.eu>
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Cc: Kestrel seventyfour <kestrelseventyfour@gmail.com>
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Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
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---
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drivers/mtd/nand/raw/xway_nand.c | 12 +++++++++---
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1 file changed, 9 insertions(+), 3 deletions(-)
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--- a/drivers/mtd/nand/raw/xway_nand.c
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+++ b/drivers/mtd/nand/raw/xway_nand.c
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@@ -148,9 +148,8 @@ static void xway_write_buf(struct nand_c
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static int xway_attach_chip(struct nand_chip *chip)
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{
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- chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
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-
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- if (chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)
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+ if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_SOFT &&
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+ chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)
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chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
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return 0;
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@@ -219,6 +218,13 @@ static int xway_nand_probe(struct platfo
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| NAND_CON_SE_P | NAND_CON_WP_P | NAND_CON_PRE_P
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| cs_flag, EBU_NAND_CON);
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+ /*
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+ * This driver assumes that the default ECC engine should be TYPE_SOFT.
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+ * Set ->engine_type before registering the NAND devices in order to
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+ * provide a driver specific default value.
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+ */
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+ data->chip.ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
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+
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/* Scan to find existence of the device */
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err = nand_scan(&data->chip, 1);
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if (err)
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