linux-kernel - Re: [PATCH v3 2/2] mtd: spi-nor: core: avoid odd length/address writes in 8D-8D-8D mode

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Message-ID: <mafs0jz37wfsf.fsf@kernel.org>
Date: Wed, 13 Aug 2025 14:46:08 +0200
From: Pratyush Yadav <pratyush@...nel.org>
To: Luke Wang <ziniu.wang_1@....com>
Cc: "pratyush@...nel.org" <pratyush@...nel.org>,  "tudor.ambarus@...aro.org"
 <tudor.ambarus@...aro.org>,  "mwalle@...nel.org" <mwalle@...nel.org>,
  "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
  "richard@....at" <richard@....at>,  "vigneshr@...com" <vigneshr@...com>,
  "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
  "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,  Bough
 Chen <haibo.chen@....com>,  Han Xu <han.xu@....com>
Subject: Re: [PATCH v3 2/2] mtd: spi-nor: core: avoid odd length/address
 writes in 8D-8D-8D mode

Hi Luke,

On Wed, Aug 13 2025, Luke Wang wrote:

> Gentle ping on this, are there any comments or issues?

I plan to review it this in the next couple weeks (hopefully this one).

>> 
>> On Octal DTR capable flashes like Micron Xcella the writes cannot start
>> or end at an odd address in Octal DTR mode. Extra 0xff bytes need to be
>> appended or prepended to make sure the start address and end address are
>> even. 0xff is used because on NOR flashes a program operation can only
>> flip bits from 1 to 0, not the other way round. 0 to 1 flip needs to
>> happen via erases.
>> 
>> Signed-off-by: Pratyush Yadav <p.yadav@...com>
>> Reviewed-by: Michael Walle <michael@...le.cc>
>> Signed-off-by: Luke Wang <ziniu.wang_1@....com>
[...]

-- 
Regards,
Pratyush Yadav