linux-kernel - Re: [PATCH v2] mtd: rawnand: Ensure the nand chip supports cached reads

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Date:   Mon, 16 Oct 2023 11:27:02 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Rouven Czerwinski <r.czerwinski@...gutronix.de>,
        Martin Hundebøll <martin@...nix.com>,
        Måns Rullgård <mans@...sr.com>,
        Alexander Shiyan <eagle.alexander923@...il.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        JaimeLiao <jaimeliao.tw@...il.com>
Cc:     kernel@...gutronix.de, stable@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mtd: rawnand: Ensure the nand chip supports cached reads

On Fri, 2023-09-22 at 14:17:16 UTC, Rouven Czerwinski wrote:
> Both the JEDEC and ONFI specification say that read cache sequential
> support is an optional command. This means that we not only need to
> check whether the individual controller supports the command, we also
> need to check the parameter pages for both ONFI and JEDEC NAND flashes
> before enabling sequential cache reads.
> 
> This fixes support for NAND flashes which don't support enabling cache
> reads, i.e. Samsung K9F4G08U0F or Toshiba TC58NVG0S3HTA00.
> 
> Sequential cache reads are now only available for ONFI and JEDEC
> devices, if individual vendors implement this, it needs to be enabled
> per vendor.
> 
> Tested on i.MX6Q with a Samsung NAND flash chip that doesn't support
> sequential reads.
> 
> Fixes: 003fe4b9545b ("mtd: rawnand: Support for sequential cache reads")
> Cc: stable@...r.kernel.org
> Signed-off-by: Rouven Czerwinski <r.czerwinski@...gutronix.de>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/fixes, thanks.

Miquel