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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Paul Cercueil <paul@crapouillou.net>,
        Miquel Raynal <miquel.raynal@bootlin.com>
Subject: [PATCH 5.16 0020/1039] mtd: rawnand: davinci: Rewrite function description
Date:   Mon, 24 Jan 2022 19:30:09 +0100
Message-Id: <20220124184125.820352097@linuxfoundation.org>
In-Reply-To: <20220124184125.121143506@linuxfoundation.org>
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From: Paul Cercueil <paul@crapouillou.net>

commit 0697f8441faad552fbeb02d74454b5e7bcc956a2 upstream.

The original comment that describes the function
nand_davinci_read_page_hwecc_oob_first() is very obscure and it is hard
to understand what it is for.

Cc: <stable@vger.kernel.org> # v5.2
Fixes: a0ac778eb82c ("mtd: rawnand: ingenic: Add support for the JZ4740")
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20211016132228.40254-3-paul@crapouillou.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/mtd/nand/raw/davinci_nand.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

--- a/drivers/mtd/nand/raw/davinci_nand.c
+++ b/drivers/mtd/nand/raw/davinci_nand.c
@@ -372,17 +372,15 @@ correct:
 }
 
 /**
- * nand_read_page_hwecc_oob_first - hw ecc, read oob first
+ * nand_davinci_read_page_hwecc_oob_first - Hardware ECC page read with ECC
+ *                                          data read from OOB area
  * @chip: nand chip info structure
  * @buf: buffer to store read data
  * @oob_required: caller requires OOB data read to chip->oob_poi
  * @page: page number to read
  *
- * Hardware ECC for large page chips, require OOB to be read first. For this
- * ECC mode, the write_page method is re-used from ECC_HW. These methods
- * read/write ECC from the OOB area, unlike the ECC_HW_SYNDROME support with
- * multiple ECC steps, follows the "infix ECC" scheme and reads/writes ECC from
- * the data area, by overwriting the NAND manufacturer bad block markings.
+ * Hardware ECC for large page chips, which requires the ECC data to be
+ * extracted from the OOB before the actual data is read.
  */
 static int nand_davinci_read_page_hwecc_oob_first(struct nand_chip *chip,
 						  uint8_t *buf,