linux-kernel - Re: [PATCH v7 4/6] mtd: spinand: micron: identify SPI NAND device with Continuous Read mode

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Message-Id: <20200312213316.7311-1-miquel.raynal@bootlin.com>
Date:   Thu, 12 Mar 2020 22:33:16 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     shiva.linuxworks@...il.com,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Chuanhong Guo <gch981213@...il.com>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Shivamurthy Shastri <sshivamurthy@...ron.com>
Subject: Re: [PATCH v7 4/6] mtd: spinand: micron: identify SPI NAND device with Continuous Read mode

On Wed, 2020-03-11 at 17:57:33 UTC, shiva.linuxworks@...il.com wrote:
> From: Shivamurthy Shastri <sshivamurthy@...ron.com>
> 
> Add SPINAND_HAS_CR_FEAT_BIT flag to identify the SPI NAND device with
> the Continuous Read mode.
> 
> Some of the Micron SPI NAND devices have the "Continuous Read" feature
> enabled by default, which does not fit the subsystem needs.
> 
> In this mode, the READ CACHE command doesn't require the starting column
> address. The device always output the data starting from the first
> column of the cache register, and once the end of the cache register
> reached, the data output continues through the next page. With the
> continuous read mode, it is possible to read out the entire block using
> a single READ command, and once the end of the block reached, the output
> pins become High-Z state. However, during this mode the read command
> doesn't output the OOB area.
> 
> Hence, we disable the feature at probe time.
> 
> Signed-off-by: Shivamurthy Shastri <sshivamurthy@...ron.com>
> Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>

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

Miquel