netdev - [PATCH net 0/3] net: fsl/fman: address erratum A011043

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Message-Id: <1579699229-5948-1-git-send-email-madalin.bucur@oss.nxp.com>
Date:   Wed, 22 Jan 2020 15:20:26 +0200
From:   Madalin Bucur <madalin.bucur@....nxp.com>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org,
        Madalin Bucur <madalin.bucur@....nxp.com>
Subject: [PATCH net 0/3] net: fsl/fman: address erratum A011043

This addresses a HW erratum on some QorIQ DPAA devices.

MDIO reads to internal PCS registers may result in having
the MDIO_CFG[MDIO_RD_ER] bit set, even when there is no
error and read data (MDIO_DATA[MDIO_DATA]) is correct.
Software may get false read error when reading internal
PCS registers through MDIO. As a workaround, all internal
MDIO accesses should ignore the MDIO_CFG[MDIO_RD_ER] bit.
When the issue was present, one could see such errors
during boot:

  mdio_bus ffe4e5000: Error while reading PHY0 reg at 3.3

Madalin Bucur (3):
  dt-bindings: net: add fsl,erratum-a011043
  powerpc/fsl/dts: add fsl,erratum-a011043
  net/fsl: treat fsl,erratum-a011043

 Documentation/devicetree/bindings/net/fsl-fman.txt          | 13 +++++++++++++
 .../boot/dts/fsl/qoriq-fman3-0-10g-0-best-effort.dtsi       |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-0-10g-0.dtsi          |  1 +
 .../boot/dts/fsl/qoriq-fman3-0-10g-1-best-effort.dtsi       |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-0-10g-1.dtsi          |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-0-1g-0.dtsi           |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-0-1g-1.dtsi           |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-0-1g-2.dtsi           |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-0-1g-3.dtsi           |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-0-1g-4.dtsi           |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-0-1g-5.dtsi           |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-1-10g-0.dtsi          |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-1-10g-1.dtsi          |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-1-1g-0.dtsi           |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-1-1g-1.dtsi           |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-1-1g-2.dtsi           |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-1-1g-3.dtsi           |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-1-1g-4.dtsi           |  1 +
 arch/powerpc/boot/dts/fsl/qoriq-fman3-1-1g-5.dtsi           |  1 +
 drivers/net/ethernet/freescale/xgmac_mdio.c                 |  7 ++++++-
 20 files changed, 37 insertions(+), 1 deletion(-)

-- 
2.1.0