From: Jan Hoffmann <jan@3e8.eu>
To: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Daniel Kestrel <kestrelseventyfour@gmail.com>,
Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>,
linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] mtd: rawnand: xway: No hardcoded ECC engine, use device tree setting
Date: Sat, 18 Sep 2021 23:26:48 +0200 [thread overview]
Message-ID: <14eb0cb7-b0af-87bf-b9a5-3e35eeb43f54@3e8.eu> (raw)
In-Reply-To: <20210917213246.319e60cb@xps13>
Hi Miquèl,
> Yes this was my understanding, that only software ECC engine was
> supported. The mainline driver shows absolutely no signs of hardware
> ECC engine support.
>
> Perhaps however you mean that on-die ECC engine are not supported
> anymore because of the engine_type being set in attach_chip()?
Yes, this is exactly the issue.
> If yes then indeed there is something to do, perhaps checking if an
> engine has been already set is enough? You can try something like:
>
> if (engine_type == unknown)
> engine_type = soft;
Checking for NAND_ECC_ENGINE_TYPE_INVALID doesn't work, as the engine
type is already set to NAND_ECC_ENGINE_TYPE_ON_HOST by rawnand_dt_init.
The code there seems to expect that chip->ecc.engine_type contains the
default value, which is no longer the case after commit 525914b5bd8
("mtd: rawnand: xway: Move the ECC initialization to ->attach_chip()").
The following in attach_chip works:
if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_ON_HOST)
chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
However, this will also silently use the software ECC engine if anyone
actually configures the on-host hardware ECC engine in the device tree
(which is of course unsupported for xway).
Thanks,
Jan
next prev parent reply other threads:[~2021-09-18 21:35 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-08 7:26 [PATCH v2] mtd: rawnand: xway: No hardcoded ECC engine, use device tree setting Daniel Kestrel
2021-08-16 7:31 ` Miquel Raynal
2021-08-19 7:21 ` Kestrel seventyfour
2021-08-19 8:03 ` Miquel Raynal
2021-08-23 11:19 ` Kestrel seventyfour
2021-08-23 15:24 ` Miquel Raynal
2021-08-24 7:15 ` Kestrel seventyfour
2021-08-24 17:22 ` Miquel Raynal
2021-08-25 8:47 ` Kestrel seventyfour
2021-08-25 8:51 ` Miquel Raynal
2021-08-25 14:07 ` Kestrel seventyfour
2021-08-25 15:31 ` Miquel Raynal
2021-08-26 5:27 ` Kestrel seventyfour
2021-09-16 19:38 ` Jan Hoffmann
2021-09-17 17:01 ` Miquel Raynal
2021-09-17 17:45 ` Jan Hoffmann
2021-09-17 19:32 ` Miquel Raynal
2021-09-18 21:26 ` Jan Hoffmann [this message]
2021-09-27 16:31 ` Miquel Raynal
2021-09-27 20:32 ` Jan Hoffmann
2021-09-28 8:49 ` Miquel Raynal
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