[PATCH v2 0/2] mtd: spi-nor: add Global Block Unlock support

[<Tudor.Ambarus@microchip.com>]

From: Tudor Ambarus <tudor.ambarus@microchip.com>

v2: the check for UNLOCK_GLOBAL_BLOCK should be done the first
thing in spi_nor_disable_block_protection(). We use it for a faster
throughput, a single command cycle that unlocks the entire memory
array. Fix it.

This is similar with what other nor flashes are doing by clearing the
block protection bits from the status register: disable the write
protection after a power-on reset cycle.

The Global Block-Protection Unlock command offers a single command cycle
that unlocks the entire memory array. Prefer this method for higher
throughput.

Tested on the sst26vf064b flash using the atmel-quadspi driver.

This has nothing to do with the move manufacturer out of the spi-nor core
pursue, but depends on 'mtd: spi-nor: move manuf out of the core - batch 0'
https://patchwork.ozlabs.org/project/linux-mtd/list/?series=127030

Tudor Ambarus (2):
  mtd: spi-nor: add Global Block Unlock support
  mtd: spi-nor: unlock global block protection on sst26vf064b

 drivers/mtd/spi-nor/spi-nor.c | 50 +++++++++++++++++++++++++++++++++++++++++--
 include/linux/mtd/spi-nor.h   |  1 +
 2 files changed, 49 insertions(+), 2 deletions(-)

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2.9.5