linux-kernel - [PATCH v3 0/1] Set FORCE_CSX bit when arbitration between NAND and NOR is enabled.

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Message-Id: <20170928005756.3938-1-kalyan.kinthada@alliedtelesis.co.nz>
Date:   Thu, 28 Sep 2017 13:57:55 +1300
From:   Kalyan Kinthada <kalyan.kinthada@...iedtelesis.co.nz>
To:     dwmw2@...radead.org, computersforpeace@...il.com,
        boris.brezillon@...e-electrons.com, marek.vasut@...il.com,
        richard@....at, cyrille.pitchen@...ev4u.fr, robh+dt@...nel.org,
        mark.rutland@....com, ezequiel.garcia@...e-electrons.com,
        miquel.raynal@...e-electrons.com, devicetree@...r.kernel.org
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        chris.packham@...iedtelesis.co.nz,
        Kalyan Kinthada <kalyan.kinthada@...iedtelesis.co.nz>
Subject: [PATCH v3 0/1] Set FORCE_CSX bit when arbitration between NAND and NOR is enabled.

When the arbitration between NOR and NAND flash is enabled
the <FORCE_CSX> field bit[21] in the Data Flash Control Register
needs to be set to 1 according to guidleine GL-5830741
mentioned in Marvell Errata document MV-S501377-00, Rev. D.

Set the FORCE_CSX bit in NDCR for ARMADA370 variants as the arbitration
is always enabled by default. This change does not apply for pxa3xx
variants because FORCE_CSX bit does not exist/reserved on the NFCv1.

Ran the "flash_speed" tool on NAND flash on a board with
Armada-xp based SoC which uses only one NAND chip and not using
the arbiter. There is no regression or speed penalty
introduced due to this change.

Changes since v2:
Thanks Miquel RAYNAL for the suggestion.

* "mtd: nand: pxa3xx: Set FORCE_CSX bit to ARMADA370 variants."
  Modified commit message to mention that this change does not apply
  for pxa3xx variants.
  Fixed the missing space in comments.
  Removed unused macros "NDCR_ND_MODE" and "NDCR_NAND_MODE".

Changes since v1:
Thanks Miquel RAYNAL for the suggestion.

* Deleted: "dt-bindings: mtd: pxa3xx: Add "marvell,nand-force-csx" compatible string"
  Not necessary to create a new compatible string.

* "mtd: nand: pxa3xx: Set FORCE_CSX bit to ARMADA370 variants."
  Modified commit message.
  This commit sets the FORCE_CSX bit for all ARMADA370 variants.

-----

Kalyan Kinthada (1):
  mtd: nand: pxa3xx: Set FORCE_CSX bit to ARMADA370 variants.

 drivers/mtd/nand/pxa3xx_nand.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

-- 
2.14.1