linux-kernel - Re: [PATCH v2 0/6] fw

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Message-ID: <CAGETcx_C8N8r4nQiUU1eGdkE3E1b=wxUTFEtKhSfobqrdDrTQw@mail.gmail.com>
Date:   Wed, 15 Sep 2021 09:44:16 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Len Brown <lenb@...nel.org>,
        John Stultz <john.stultz@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Vladimir Oltean <olteanv@...il.com>, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 0/6] fw_devlink improvements

On Wed, Sep 15, 2021 at 1:44 AM Marek Szyprowski
<m.szyprowski@...sung.com> wrote:
>
> Hi Saravana,
>
> On 15.09.2021 10:11, Saravana Kannan wrote:
> > Patches ready for picking up:
> > Patch 1 fixes a bug in fw_devlink.
> > Patch 2-4 are meant to make debugging easier
> > Patch 5 and 6 fix fw_devlink issues with PHYs and networking
>
> Is this patchset supposed to fix the PHY related issues I've experienced
> or does it also require the Andrew's patch for 'mdio-parent-bus'? If the
> first, then applying only this patchset on top of today's linux-next
> doesn't fix the ethernet issue on my Amlogic SoC based test boards.

Marek,

The issue you hit was actually a general issue with fw_devlink and
that's fixed by Patch 1. But I also needed to revert the phy-handle
patch for other reasons (see commit text) and that fixes the issue you
were hitting without needing the 'mdio-parent-bus' patch.
https://lore.kernel.org/lkml/20210915081933.485112-1-saravanak@google.com/

When I eventually bring back phy-handle support, I'll need the
'mdio-parent-bus' to not break your use case.

Hope that clarifies things.

-Saravana

>
> > Andrew,
> >
> > I think Patch 5 and 6 should be picked up be Greg too. Let me know if
> > you disagree.
> >
> > -Saravana
> >
> > Cc: John Stultz <john.stultz@...aro.org>
> > Cc: Marek Szyprowski <m.szyprowski@...sung.com>
> > Cc: Rob Herring <robh+dt@...nel.org>
> > Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> > Cc: Andrew Lunn <andrew@...n.ch>
> > Cc: Vladimir Oltean <olteanv@...il.com>
> >
> > v1->v2:
> > - Added a few Reviewed-by and Tested-by tags
> > - Addressed Geert's comments in patches 3 and 5
> > - Dropped the fw_devlink.debug patch
> > - Added 2 more patches to the series to address other fw_devlink issues
> >
> > Thanks,
> > Saravana
> >
> > Saravana Kannan (6):
> >    driver core: fw_devlink: Improve handling of cyclic dependencies
> >    driver core: Set deferred probe reason when deferred by driver core
> >    driver core: Create __fwnode_link_del() helper function
> >    driver core: Add debug logs when fwnode links are added/deleted
> >    driver core: fw_devlink: Add support for FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD
> >    net: mdiobus: Set FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD for mdiobus parents
> >
> >   drivers/base/core.c        | 90 ++++++++++++++++++++++++++------------
> >   drivers/net/phy/mdio_bus.c |  4 ++
> >   include/linux/fwnode.h     | 11 +++--
> >   3 files changed, 75 insertions(+), 30 deletions(-)
> >
> Best regards
> --
> Marek Szyprowski, PhD
> Samsung R&D Institute Poland
>