linux-kernel - Re: [PATCH v3 00/12] fw

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Message-ID: <CAGETcx_SQJ1q_f8r+zKATF-EEb0P-T_ot15AQ1x1Vc_3h=XfCw@mail.gmail.com>
Date:   Fri, 10 Feb 2023 11:27:11 -0800
From:   Saravana Kannan <saravanak@...gle.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Cristian Marussi <cristian.marussi@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Abel Vesa <abel.vesa@...aro.org>,
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        Tony Lindgren <tony@...mide.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        John Stultz <jstultz@...gle.com>,
        Doug Anderson <dianders@...omium.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Maxim Kiselev <bigunclemax@...il.com>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Luca Weiss <luca.weiss@...rphone.com>,
        Colin Foster <colin.foster@...advantage.com>,
        Martin Kepplinger <martin.kepplinger@...i.sm>,
        Jean-Philippe Brucker <jpb@...nel.org>,
        kernel-team@...roid.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v3 00/12] fw_devlink improvements

On Fri, Feb 10, 2023 at 2:13 AM Vladimir Oltean <vladimir.oltean@....com> wrote:
>
> Hi Saravana,
>
> On Mon, Feb 06, 2023 at 05:41:52PM -0800, Saravana Kannan wrote:
> > Vladimir,
> >
> > Ccing you because DSA's and fw_devlink have known/existing problems
> > (still in my TODOs to fix). But I want to make sure this series doesn't
> > cause additional problems for DSA.
> >
> > All,
> >
> > This patch series improves fw_devlink in the following ways:
> >
> > 1. It no longer cares about a fwnode having a "compatible" property. It
> >    figures this out more dynamically. The only expectation is that
> >    fwnodes that are converted to devices actually get probed by a driver
> >    for the dependencies to be enforced correctly.
> >
> > 2. Finer grained dependency tracking. fw_devlink will now create device
> >    links from the consumer to the actual resource's device (if it has one,
> >    Eg: gpio_device) instead of the parent supplier device. This improves
> >    things like async suspend/resume ordering, potentially remove the need
> >    for frameworks to create device links, more parallelized async probing,
> >    and better sync_state() tracking.
> >
> > 3. Handle hardware/software quirks where a child firmware node gets
> >    populated as a device before its parent firmware node AND actually
> >    supplies a non-optional resource to the parent firmware node's
> >    device.
> >
> > 4. Way more robust at cycle handling (see patch for the insane cases).
> >
> > 5. Stops depending on OF_POPULATED to figure out some corner cases.
> >
> > 6. Simplifies the work that needs to be done by the firmware specific
> >    code.
> >
> > The v3 series has gone through my usual testing on my end and looks good
> > to me.
>
> Booted on an NXP LS1028A (arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts)
> and a Turris MOX (arch/arm64/boot/dts/marvell/armada-3720-turris-mox.dts)
> with no observed regressions.

Thanks for testing Vladimir!

> Is there something specific you would like
> me to test?


Not really, I just want to make sure the common DSA architectures
don't hit any regression. In the hardware you tested, are there cases
of PHYs where the supplier is the parent MDIO? I remember that being
the only case where I needed special casing
(FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD) in fw_devlink -- so it'll be
good to make sure I didn't accidentally break anything there.


-Saravana