linux-kernel - Re: [PATCH v9 06/19] mtd: spi-nor: sfdp: default to addr

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Message-ID: <12165309.mSmAnqxVWc@192.168.0.120>
Date:   Sat, 30 May 2020 18:49:21 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <p.yadav@...com>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <broonie@...nel.org>, <Nicolas.Ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <Ludovic.Desroches@...rochip.com>,
        <matthias.bgg@...il.com>, <michal.simek@...inx.com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-spi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <nsekhar@...com>,
        <boris.brezillon@...labora.com>, <masonccyang@...c.com.tw>
Subject: Re: [PATCH v9 06/19] mtd: spi-nor: sfdp: default to addr_width of 3
 for configurable widths

On Monday, May 25, 2020 12:15:31 PM EEST Pratyush Yadav wrote:
> JESD216D.01 says that when the address width can be 3 or 4, it defaults
> to 3 and enters 4-byte mode when given the appropriate command. So, when
> we see a configurable width, default to 3 and let flash that default to
> 4 change it in a post-bfpt fixup.
> 
> This fixes SMPT parsing for flashes with configurable address width. If
> the SMPT descriptor advertises variable address width, we use
> nor->addr_width as the address width. But since it was not set to any
> value from the SFDP table, the read command uses an address width of 0,
> resulting in an incorrect read being issued.
> 
> Signed-off-by: Pratyush Yadav <p.yadav@...com>
> ---
>  drivers/mtd/spi-nor/sfdp.c | 1 +
>  1 file changed, 1 insertion(+)

Applied, thanks.