linux-kernel - [PATCH 0/3] mtd: Ingenic NAND fix for JZ4740

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Date:   Sat,  9 Oct 2021 20:49:49 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Harvey Hunt <harveyhuntnexus@...il.com>
Cc:     list@...ndingux.net, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 0/3] mtd: Ingenic NAND fix for JZ4740

Hi,

Looks like NAND support has been broken on the JZ4740 SoC for a while;
it looks like it comes from the fact that the "hw_oob_first" mechanism
was dropped from the NAND core and moved to the Davinci driver.

It turns out the JZ4740 SoC needs it too; I didn't notice it when
writing the new ingenic-nand driver (to replace the old jz4740-nand
driver) most likely because my Device Tree had the "nand-ecc-mode" set
to "hw_oob_first".

I am not very sure about patch [1/3]; to me the original code does not
make sense, and it didn't work out-of-the-box on the JZ4740 without it.
By applying patch [1/3] the function nand_read_page_hwecc_oob_first()
can be reused for the JZ4740 SoC as well. But I did not test patch [1/3]
on Davinci.

Cheers,
-Paul

Paul Cercueil (3):
  mtd: rawnand/davinci: Don't calculate ECC when reading page
  mtd: rawnand: Export nand_read_page_hwecc_oob_first()
  mtd: rawnand/ingenic: JZ4740 needs 'oob_first' read page function

 drivers/mtd/nand/raw/davinci_nand.c           | 73 +------------------
 .../mtd/nand/raw/ingenic/ingenic_nand_drv.c   |  5 ++
 drivers/mtd/nand/raw/nand_base.c              | 69 ++++++++++++++++++
 include/linux/mtd/rawnand.h                   |  2 +
 4 files changed, 77 insertions(+), 72 deletions(-)

-- 
2.33.0