From: Boris Brezillon <boris.brezillon@free-electrons.com>
To: David Woodhouse <dwmw2@infradead.org>,
Brian Norris <computersforpeace@gmail.com>,
linux-mtd@lists.infradead.org,
Boris Brezillon <boris.brezillon@free-electrons.com>,
Richard Weinberger <richard@nod.at>
Cc: Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [RESEND PATCH 3/3] mtd: nand: sunxi: Support ECC maximization
Date: Wed, 8 Jun 2016 17:04:24 +0200 [thread overview]
Message-ID: <1465398264-8202-4-git-send-email-boris.brezillon@free-electrons.com> (raw)
In-Reply-To: <1465398264-8202-1-git-send-email-boris.brezillon@free-electrons.com>
Setup the maximum ECC config when NAND_ECC_MAXIMIZE is set.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
drivers/mtd/nand/sunxi_nand.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c
index 8dfcb65..21dad0b 100644
--- a/drivers/mtd/nand/sunxi_nand.c
+++ b/drivers/mtd/nand/sunxi_nand.c
@@ -1814,6 +1814,35 @@ static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
if (!data)
return -ENOMEM;
+ if (ecc->options & NAND_ECC_MAXIMIZE) {
+ int bytes;
+
+ ecc->size = 1024;
+ nsectors = mtd->writesize / ecc->size;
+
+ /* Reserve 2 bytes for the BBM */
+ bytes = (mtd->oobsize - 2) / nsectors;
+
+ /* 4 non-ECC bytes are added before each ECC bytes section */
+ bytes -= 4;
+
+ /* and bytes has to be even. */
+ if (bytes % 2)
+ bytes--;
+
+ ecc->strength = bytes * 8 / fls(8 * ecc->size);
+
+ for (i = 0; i < ARRAY_SIZE(strengths); i++) {
+ if (strengths[i] > ecc->strength)
+ break;
+ }
+
+ if (!i)
+ ecc->strength = 0;
+ else
+ ecc->strength = strengths[i - 1];
+ }
+
if (ecc->size != 512 && ecc->size != 1024)
return -EINVAL;
--
2.7.4
next prev parent reply other threads:[~2016-06-08 15:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-08 15:04 [RESEND PATCH 0/3] mtd: nand: standardize ECC maximization Boris Brezillon
2016-06-08 15:04 ` [RESEND PATCH 1/3] mtd: nand: Add an option to maximize the ECC strength Boris Brezillon
2016-06-10 14:04 ` Rob Herring
2016-06-08 15:04 ` [RESEND PATCH 2/3] mtd: nand: Support maximizing ECC when using software BCH Boris Brezillon
2016-06-08 15:04 ` Boris Brezillon [this message]
2016-09-16 13:08 ` [RESEND PATCH 0/3] mtd: nand: standardize ECC maximization Boris Brezillon
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