From: Boris Brezillon <bbrezillon@kernel.org>
To: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Mason Yang <masonccyang@mxic.com.tw>, Vignesh R <vigneshr@ti.com>,
Tudor Ambarus <Tudor.Ambarus@microchip.com>,
Julien Su <juliensu@mxic.com.tw>,
Richard Weinberger <richard@nod.at>,
Schrempf Frieder <frieder.schrempf@kontron.de>,
Marek Vasut <marek.vasut@gmail.com>,
linux-mtd@lists.infradead.org,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Brian Norris <computersforpeace@gmail.com>,
David Woodhouse <dwmw2@infradead.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC PATCH 25/27] mtd: nand: Add helpers to manage ECC engines and configurations
Date: Fri, 22 Feb 2019 15:44:31 +0100 [thread overview]
Message-ID: <20190222154431.66c6911f@kernel.org> (raw)
In-Reply-To: <20190221125806.28875-13-miquel.raynal@bootlin.com>
On Thu, 21 Feb 2019 13:58:04 +0100
Miquel Raynal <miquel.raynal@bootlin.com> wrote:
> Add the logic in the NAND core to find the right ECC engine depending
> on the NAND chip requirements and the user desires. Right now, the
> choice may be made between (more will come):
> * software Hamming
> * software BCH
> * on-die (SPI-NAND devices only)
>
> Once the ECC engine has been found, the ECC engine must be
> configured.
>
> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> ---
> drivers/mtd/nand/core.c | 107 +++++++++++++++++++++++++++++++++++++++
> include/linux/mtd/nand.h | 4 ++
> 2 files changed, 111 insertions(+)
>
> diff --git a/drivers/mtd/nand/core.c b/drivers/mtd/nand/core.c
> index 872d46b5fc0f..9feb118c9f68 100644
> --- a/drivers/mtd/nand/core.c
> +++ b/drivers/mtd/nand/core.c
> @@ -207,6 +207,113 @@ int nanddev_mtd_max_bad_blocks(struct mtd_info *mtd, loff_t offs, size_t len)
> }
> EXPORT_SYMBOL_GPL(nanddev_mtd_max_bad_blocks);
>
> +/**
> + * nanddev_find_ecc_engine() - Find a suitable ECC engine
> + * @nand: NAND device
> + */
> +static int nanddev_find_ecc_engine(struct nand_device *nand)
Can we pass the conf in argument instead of reading it from
nand->ecc.user_conf?
> +{
> + bool is_spinand = mtd_type_is_spinand(&nand->mtd);
And here is the reason for the SPINAND type.
> +
> + /* Read the user desires in terms of ECC engine/configuration */
> + nand_ecc_read_user_conf(nand);
> +
> + /* No ECC engine requestedn, let's return without error */
> + if (nand->ecc.user_conf.mode == NAND_ECC_NONE)
> + return 0;
> +
> + /* Raw NAND default mode is hardware */
> + if (!is_spinand && nand->ecc.user_conf.mode < 0)
> + nand->ecc.user_conf.mode = NAND_ECC_HW;
We should let the raw NAND layer take this decision (actually, it's
even a raw NAND controller driver decision). Please complain if
user_conf.mode is invalid.
This way you won't need the SPINAND type you added in one of your
previous patch.
> +
> + /* SPI-NAND default mode is on-die */
> + if (is_spinand && nand->ecc.user_conf.mode < 0)
> + nand->ecc.user_conf.mode = NAND_ECC_ON_DIE;
> +
> + switch (nand->ecc.user_conf.mode) {
> + case NAND_ECC_SOFT:
> + nand->ecc.engine = nand_ecc_sw_get_engine(nand);
> + break;
> + case NAND_ECC_ON_DIE:
> + if (is_spinand)
> + nand->ecc.engine = spinand_ondie_ecc_get_engine();
So, maybe it's worth having the ondie ECC engine instance directly
embedded in nand_device instead of spinand, or maybe just a pointer, so
that you don't reserve extra space when the NAND device does not have
on-die ECC.
> + else
> + pr_err("On-die ECC engines for non SPI devices not supported yet\n");
> + break;
> + case NAND_ECC_HW:
> + pr_err("Hardware ECC engines not supported yet\n");
> + break;
> + default:
> + pr_err("Missing ECC engine property\n");
> + }
> +
> + if (!nand->ecc.engine)
> + return -EINVAL;
> +
> + return 0;
> +}
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next prev parent reply other threads:[~2019-02-22 14:44 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-21 12:57 [RFC PATCH 13/27] mtd: nand: ecc: Clarify the software Hamming introductory line Miquel Raynal
2019-02-21 12:57 ` [RFC PATCH 14/27] mtd: nand: ecc: Turn the software Hamming implementation generic Miquel Raynal
2019-02-21 13:22 ` Boris Brezillon
2019-02-21 12:57 ` [RFC PATCH 15/27] mtd: nand: Remove useless include about software Hamming ECC Miquel Raynal
2019-02-21 12:57 ` [RFC PATCH 16/27] mtd: nand: ecc: Let the software BCH ECC engine be a module Miquel Raynal
2019-02-21 13:48 ` Adam Ford
2019-02-21 14:02 ` Miquel Raynal
2019-02-22 14:24 ` Boris Brezillon
2019-02-21 12:57 ` [RFC PATCH 17/27] mtd: nand: ecc: Let the software Hamming ECC engine be unselected Miquel Raynal
2019-02-21 13:20 ` Boris Brezillon
2019-02-21 13:35 ` Miquel Raynal
2019-02-21 13:41 ` Boris Brezillon
2019-02-21 13:46 ` Miquel Raynal
2019-02-21 12:57 ` [RFC PATCH 18/27] mtd: nand: ecc: Create the software BCH engine instance Miquel Raynal
2019-02-21 12:57 ` [RFC PATCH 19/27] mtd: nand: ecc: Create the software Hamming " Miquel Raynal
2019-02-21 12:57 ` [RFC PATCH 20/27] mtd: nand: Let software ECC engines be retrieved from the NAND core Miquel Raynal
2019-02-22 14:29 ` Boris Brezillon
2019-02-25 15:49 ` Miquel Raynal
2019-02-25 16:13 ` Boris Brezillon
2019-02-26 15:54 ` Miquel Raynal
2019-02-21 12:58 ` [RFC PATCH 21/27] mtd: spinand: Fix typo in comment Miquel Raynal
2019-02-22 14:31 ` Boris Brezillon
2019-02-21 12:58 ` [RFC PATCH 22/27] mtd: spinand: Let the SPI-NAND core flag a SPI-NAND chip Miquel Raynal
2019-02-22 14:33 ` Boris Brezillon
2019-02-21 12:58 ` [RFC PATCH 23/27] mtd: spinand: Move the ECC helper functions into a separate file Miquel Raynal
2019-02-21 12:58 ` [RFC PATCH 24/27] mtd: spinand: Instantiate a SPI-NAND on-die ECC engine Miquel Raynal
2019-02-22 14:38 ` Boris Brezillon
2019-02-21 12:58 ` [RFC PATCH 25/27] mtd: nand: Add helpers to manage ECC engines and configurations Miquel Raynal
2019-02-22 14:44 ` Boris Brezillon [this message]
2019-02-25 16:01 ` Miquel Raynal
2019-02-25 16:34 ` Boris Brezillon
2019-02-25 18:48 ` Boris Brezillon
2019-02-26 15:59 ` [RFC PATCH 25/27] mtd: nand: Add helpers to manage ECC engines and configurationsND Miquel Raynal
2019-02-26 16:04 ` Boris Brezillon
2019-02-27 14:07 ` [RFC PATCH 25/27] mtd: nand: Add helpers to manage ECC engines and configurations Miquel Raynal
2019-02-27 14:30 ` Boris Brezillon
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