[PATCH 0/5] meson-gx: reset RGMII PHYs and configure TX delay

[Jerome Brunet]

On Sat, 2016-12-03 at 00:47 +0100, Martin Blumenstingl wrote:
> This partially fixes the 1000Mbit/s ethernet TX throughput issues (on
> networks which are not affected by the EEE problem, as reported here:
> [1]).
> The actual problem for the TX throughput issues was that the TX delay
> was applied twice:
> - once "accidentally" by the PHY (this was fixed with [2])
> - once by the MAC because there was a hardcoded TX delay (of 2ns),
>   this will be configurable with the changes from [0]
> 
> These are the dts changes which belong to my other series (in v2
> these patches were part of the other series, upon request of the
> net maintainers I have split the .dts changes into their own series
> so
> we are able to take both through different trees):
> "[PATCH net-next v3 0/2] stmmac: dwmac-meson8b: configurable
> RGMII TX delay": [0].
> Thus this series depends on the ACK for the binding changes in the
> other series!
> 
> I based these changes on my other series "[PATCH v2 0/2] GXL and GXM
> SCPI improvements": [3]
> 
> 
> [0] http://lists.infradead.org/pipermail/linux-amlogic/2016-December/
> 001834.html
> [1] http://lists.infradead.org/pipermail/linux-amlogic/2016-November/
> 001607.html
> [2] http://lists.infradead.org/pipermail/linux-amlogic/2016-November/
> 001707.html
> [3] http://lists.infradead.org/pipermail/linux-amlogic/2016-December/
> 001831.html
> 
> Martin Blumenstingl (5):
>   ARM64: dts: meson-gx: move the MDIO node to meson-gx

Sorry for the late reply, I've only been able to test this yesterday.

With "snps,dwmac-mdio" provided in meson-gx.dtsi, the mdio_node is
defined in stmmac_mdio_register and auto-detection of the PHY is
disabled for all meson-gx boards.

I wonder if this is desirable ? or maybe this something we could fix in
stmmac ? (perform auto-detect the mdio bus is provided without a PHY)

Also, I think bisect is broken between patch 1 and patch 4: The PHY of
some boards won't be detected between these patches. Should we squash
them ? 

>   ARM64: dts: meson-gxbb-odroidc2: add reset for the ethernet PHY
>   ARM64: dts: meson-gxbb-p20x: add reset for the ethernet PHY
>   ARM64: dts: meson-gxbb-vega-s95: add reset for the ethernet PHY
>   ARM64: dts: amlogic: add the ethernet TX delay configuration
> 

Last remark, about the use of ethernet-phy-idXXXX.XXXX in the odroid
and the vega: Isn't it better to let phylib do the autodetection of the
phy id ?

If we want to specify the id in DT, we should probably add it for the
Micrel PHY of the p200 as well, for consistency.

>  arch/arm64/boot/dts/amlogic/meson-gx.dtsi            |  6 ++++++
>  arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts  | 17
> +++++++++++++++++
>  arch/arm64/boot/dts/amlogic/meson-gxbb-p20x.dtsi     | 17
> +++++++++++++++++
>  arch/arm64/boot/dts/amlogic/meson-gxbb-vega-s95.dtsi | 17
> +++++++++++++++++
>  arch/arm64/boot/dts/amlogic/meson-gxl-s905d-p230.dts |  2 ++
>  arch/arm64/boot/dts/amlogic/meson-gxl.dtsi           |  6 ------
>  arch/arm64/boot/dts/amlogic/meson-gxm-nexbox-a1.dts  |  2 ++
>  arch/arm64/boot/dts/amlogic/meson-gxm-s912-q200.dts  |  2 ++
>  8 files changed, 63 insertions(+), 6 deletions(-)
>