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

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Message-ID: <20260208061919.30498-1-farbere@amazon.com>
Date: Sun, 8 Feb 2026 06:19:15 +0000
From: Eliav Farber <farbere@...zon.com>
To: <tudor.ambarus@...aro.org>, <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: <farbere@...zon.com>
Subject: [PATCH 0/4] mtd: spi-nor: winbond: Fix protection handling and enable dual/quad reads

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.

All changes were validated using flash_lock on the affected devices.

Eliav Farber (4):
  mtd: spi-nor: winbond: Fix locking support for w25q256jwm
  mtd: spi-nor: winbond: Fix locking support for w25q256jw
  mtd: spi-nor: winbond: Fix locking support for w25q64jvm
  mtd: spi-nor: winbond: Enable Dual and Quad support for w25q64jvm

 drivers/mtd/spi-nor/winbond.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

-- 
2.47.3