linux-kernel - [PATCH v2 0/3] mtd: rawnand: sunxi: Some cleanup

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Message-Id: <20230204143520.9682-1-samuel@sholland.org>
Date:   Sat,  4 Feb 2023 08:35:17 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     Boris Brezillon <bbrezillon@...nel.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: [PATCH v2 0/3] mtd: rawnand: sunxi: Some cleanup

(Apologies for the delay in sending v2. As discussed previously[1],
the first patch needs to be merged in the same merge window as commit
34569d869532 from v1 of the series, even if the others don't make it.)

I have an A33 tablet with MLC NAND, and I wanted to use mainline Linux
to dump the NAND. To do that, I updated this driver's ECC ops to fully
utilize the hardware for ECC and scrambling. This made the driver
compatible with the existing (scrambled) on-flash bad block map, and I
was able to read the full NAND contents.

This series contains some cleanup from that effort. The first patch
ensures we can make good use of the hardware ECC/descrambler. The other
two patches simplify some code for managing the ECC engine.

[1]: https://lore.kernel.org/linux-mtd/20230102175351.64690aaf@xps-13/

Changes in v2:
 - Update commit message to address backward-compatibility concerns
 - Keep `struct sunxi_nand_hw_ecc` but change the pointer to a value
 - Split ECC_CTL precomputation and structure updates to two patches

Samuel Holland (3):
  mtd: rawnand: sunxi: Update OOB layout to match hardware
  mtd: rawnand: sunxi: Embed sunxi_nand_hw_ecc by value
  mtd: rawnand: sunxi: Precompute the ECC_CTL register value

 drivers/mtd/nand/raw/sunxi_nand.c | 73 +++++++++----------------------
 1 file changed, 20 insertions(+), 53 deletions(-)

-- 
2.37.4