mtd: spi-nor: spansion: Enable JFFS2 write buffer for Infineon s28hx SEMPER flash

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[ Upstream commit 9fd0945fe6 ]

Infineon(Cypress) SEMPER NOR flash family has on-die ECC and its program
granularity is 16-byte ECC data unit size. JFFS2 supports write buffer
mode for ECC'd NOR flash. Provide a way to clear the MTD_BIT_WRITEABLE
flag in order to enable JFFS2 write buffer mode support.

A new SNOR_F_ECC flag is introduced to determine if the part has on-die
ECC and if it has, MTD_BIT_WRITEABLE is unset.

In vendor specific driver, a common cypress_nor_ecc_init() helper is
added. This helper takes care for ECC related initialization for SEMPER
flash family by setting up params->writesize and SNOR_F_ECC.

Fixes: c3266af101 ("mtd: spi-nor: spansion: add support for Cypress Semper flash")
Suggested-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/d586723f6f12aaff44fbcd7b51e674b47ed554ed.1680760742.git.Takahiro.Kuwano@infineon.com
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Takahiro Kuwano 2023-04-06 15:17:44 +09:00 • committed by Greg Kroah-Hartman

parent 8630dfcdab

commit 4fdb257b2a

4 changed files with 17 additions and 1 deletions

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3

drivers/mtd/spi-nor/core.c

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1

drivers/mtd/spi-nor/core.h

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1

drivers/mtd/spi-nor/debugfs.c

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13

drivers/mtd/spi-nor/spansion.c

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