linux-kernel - Re: [PATCH 0/4] mtd: spi-nor: winbond: Fix protection handling and enable dual/quad reads

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Message-Id: <DGB3YMAGZPPF.3OZ1TGVVNJ5TI@kernel.org>
Date: Tue, 10 Feb 2026 08:37:00 +0100
From: "Michael Walle" <mwalle@...nel.org>
To: "Eliav Farber" <farbere@...zon.com>, <tudor.ambarus@...aro.org>,
 <pratyush@...nel.org>, <miquel.raynal@...tlin.com>, <richard@....at>,
 <vigneshr@...com>, <linux-mtd@...ts.infradead.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/4] mtd: spi-nor: winbond: Fix protection handling and
 enable dual/quad reads

On Sun Feb 8, 2026 at 7:19 AM CET, Eliav Farber wrote:
> This series fixes block protection handling for the following Winbond
> SPI-NOR devices:
>  - w25q256jwm
>  - w25q256jw
>  - w25q64jvm
>
> The devices do not correctly describe their Status Register layout and
> protection capabilities (locking flags, TB bit, BP bit configuration).
> As a result, the spi-nor core rejects protection requests and locking
> operations fail with -EINVAL, e.g.:
>
>   flash_lock -l /dev/mtd29
>   flash_lock: error!: could not lock device: /dev/mtd29
>   error 22 (Invalid argument)
>
> Update the device flags to match the actual hardware behavior so that
> locking and unlocking regions work correctly.
>
> Additionally, enable Dual and Quad read support for w25q64jvm when SFDP
> is not used.

Do you really have devices without SFDP tables?

>
> All changes were validated using flash_lock on the affected devices.

Great thanks!

Could you also please dump the SFDP tables from all these devices,
see [1].

Thanks,
-michael

[1] https://docs.kernel.org/driver-api/mtd/spi-nor.html

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