linux-kernel - [PATCH v2 0/3] mtd: nand: mxc_nand: Convert to exec

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Date: Wed, 08 May 2024 13:08:26 +0200
From: Sascha Hauer <s.hauer@...gutronix.de>
To: Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>
Cc: linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Sascha Hauer <s.hauer@...gutronix.de>
Subject: [PATCH v2 0/3] mtd: nand: mxc_nand: Convert to exec_op

This series converts the mxc_nand driver over to exec_op which gets
us rid of a bunch of legacy code. The motivation for this series is
a board that has a NAND chip connected that needs 4bit ECC whereas the
i.MX27 hardware only supports 1Bit Hamming ECC. With this series the
driver now supports software BCH ECC.

After discussion with Miquel I have now changed the way the data is
written in software BCH ECC mode. The controller normally interleaves
user data with OOB data in a NAND page. In this version I reversed the
interleaving before writing a page and after reading a page. This way
the data on the NAND chip is arranged in the way the NAND layer expects
it and commands like NAND_CMD_RNDOUT work as expected.

Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
---
Changes in v2:
- Enable hw ecc only when needed and leave it disabled otherwise
- Use untangled data/oob layout for software BCH ECC
- Link to v1: https://lore.kernel.org/r/20240417-mtd-nand-mxc-nand-exec-op-v1-0-d12564fe54e9@pengutronix.de

---
Sascha Hauer (3):
      mtd: nand: mxc_nand: separate page read from ecc calc
      mtd: nand: mxc_nand: implement exec_op
      mtd: nand: mxc_nand: support software ECC

 drivers/mtd/nand/raw/mxc_nand.c | 651 ++++++++++++++++++----------------------
 1 file changed, 296 insertions(+), 355 deletions(-)
---
base-commit: fec50db7033ea478773b159e0e2efb135270e3b7
change-id: 20240417-mtd-nand-mxc-nand-exec-op-38b3b80c4377

Best regards,
-- 
Sascha Hauer <s.hauer@...gutronix.de>