linux-kernel - Re: [PATCH 1/2] mtd: spi-nor: macronix: Add post

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Message-ID: <1c1da131-a7b1-4c2e-9866-d7833a134033@linaro.org>
Date: Fri, 7 Feb 2025 08:37:10 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Cheng Ming Lin <linchengming884@...il.com>, pratyush@...nel.org,
 mwalle@...nel.org, miquel.raynal@...tlin.com, richard@....at,
 vigneshr@...com, linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: alvinzhou@...c.com.tw, leoyu@...c.com.tw,
 Cheng Ming Lin <chengminglin@...c.com.tw>
Subject: Re: [PATCH 1/2] mtd: spi-nor: macronix: Add post_sfdp fixups for Quad
 Input Page Program

Hi, Cheng,

On 2/7/25 8:18 AM, Cheng Ming Lin wrote:
> Although certain Macronix NOR flash support the Quad Input Page Program
> feature, the corresponding information in the 4-byte Address Instruction
> Table of these flash is not properly filled. As a result, this feature
> cannot be enabled as expected.

You need to prove that all the flashes that you touch need this fixup,
i.e. dump their SFDP and show where's the wrong bit in the SFDP table.

Identifying wrong bit in the SFDP tables would be easy to spot if we had
a SFDP decoder. Something that we all agree that'd be a good thing to
have, but nobody can allocate time to do it. Pratyush I remember has
started a draft. Are you interested in introducing a SFDP decoder in
mtd-utils?

Also, if you touch all these flashes, will you please update them and
get rid of the stray flash info fields? I'm thinking of name, size, and
no_sfdp_flags.

Cheers,
ta