netdev - Re: [PATCH net-next v6 0/4] net: enetc: remove bootloader dependency

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Date:   Sat, 11 Jul 2020 10:52:42 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Michael Walle <michael@...le.cc>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Alex Marginean <alexandru.marginean@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Heiko Thiery <heiko.thiery@...il.com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH net-next v6 0/4] net: enetc: remove bootloader dependency

On Thu, Jul 09, 2020 at 11:35:22PM +0200, Michael Walle wrote:
> This is a resend [now a new v6] of the series because the conversion to the
> phylink interface will likely take longer:
> https://lore.kernel.org/netdev/CA+h21hpBodyY8CtNH2ktRdc2FqPi=Fjp94=VVZvzSVbnvnfKVg@mail.gmail.com/
> Also the discussion in the v3 resend doesn't look like it will be resolved
> soon :/
> https://lore.kernel.org/netdev/20200701213433.9217-1-michael@walle.cc/
> 
> Unfortunately, we have boards in the wild with a bootloader which doesn't
> set the PCS up correctly. Thus I'd really see this patches picked up as an
> intermediate step until the phylink conversion is ready. Vladimir Oltean
> already offered to convert enetc to phylink when he converts the felix to
> phylink. After this series the PCS setup of the enetc looks almost the same
> as the current felix setup. Thus conversion should be easy.
> 
> These patches were picked from the following series:
> https://lore.kernel.org/netdev/1567779344-30965-1-git-send-email-claudiu.manoil@nxp.com/
> They have never been resent. I've picked them up, addressed Andrews
> comments, fixed some more bugs and asked Claudiu if I can keep their SOB
> tags; he agreed. I've tested this on our board which happens to have a
> bootloader which doesn't do the enetc setup in all cases. Though, only
> SGMII mode was tested.
> 
> changes since v5:
>  - fixed pcs->autoneg_complete and pcs->link assignment. Thanks Vladimir.
> 
> changes since v4:
>  - moved (and renamed) the USXGMII constants to include/uapi/linux/mdio.h.
>    Suggested by Russell King.
> 
> changes since v3:
>  - rebased to latest net-next where devm_mdiobus_free() was removed.
>    replace it by mdiobus_free(). The internal MDIO bus is optional, if
>    there is any error, we try to run with the bootloader default PCS
>    settings, thus in the error case, we need to free the mdiobus.
> 
> changes since v2:
>  - removed SOBs from "net: enetc: Initialize SerDes for SGMII and USXGMII
>    protocols" because almost everything has changed.
>  - get a phy_device for the internal PCS PHY so we can use the phy_
>    functions instead of raw mdiobus writes
>  - reuse macros already defined in fsl_mdio.h, move missing bits from
>    felix to fsl_mdio.h, because they share the same PCS PHY building
>    block
>  - added 2500BaseX mode (based on felix init routine)
>  - changed xgmii mode to usxgmii mode, because it is actually USXGMII and
>    felix does the same.
>  - fixed devad, which is 0x1f (MMD_VEND2)
> 
> changes since v1:
>  - mdiobus id is '"imdio-%s", dev_name(dev)' because the plain dev_name()
>    is used by the emdio.
>  - use mdiobus_write() instead of imdio->write(imdio, ..), since this is
>    already a full featured mdiobus
>  - set phy_mask to ~0 to avoid scanning the bus
>  - use phy_interface_mode_is_rgmii(phy_mode) to also include the RGMII
>    modes with pad delays.
>  - move enetc_imdio_init() to enetc_pf.c, there shouldn't be any other
>    users, should it?
>  - renamed serdes to SerDes
>  - printing the error code of mdiobus_register() in the error path
>  - call mdiobus_unregister() on _remove()
>  - call devm_mdiobus_free() if mdiobus_register() fails, since an
>    error is not fatal
> 
> Alex Marginean (1):
>   net: enetc: Use DT protocol information to set up the ports
> 
> Michael Walle (3):
>   net: phy: add USXGMII link partner ability constants
>   net: dsa: felix: (re)use already existing constants
>   net: enetc: Initialize SerDes for SGMII and USXGMII protocols
> 
>  drivers/net/dsa/ocelot/felix_vsc9959.c        |  45 ++---
>  .../net/ethernet/freescale/enetc/enetc_hw.h   |   3 +
>  .../net/ethernet/freescale/enetc/enetc_pf.c   | 188 +++++++++++++++---
>  .../net/ethernet/freescale/enetc/enetc_pf.h   |   5 +
>  include/uapi/linux/mdio.h                     |  26 +++
>  5 files changed, 210 insertions(+), 57 deletions(-)
> 
> -- 
> 2.20.1
> 

I plan to give this series a go on an LS1028A-QDS later today to make
sure there are no regressions.

Thanks,
-Vladimir