Message-ID: <20230130114839.379f08bd@xps-13>
Date:   Mon, 30 Jan 2023 11:48:39 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Saravana Kannan <saravanak@...gle.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>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Len Brown <lenb@...nel.org>,
        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>,
        Tony Lindgren <tony@...mide.com>,
        Linux Kernel Functional Testing <lkft@...aro.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Abel Vesa <abel.vesa@...aro.org>,
        Alexander Stein <alexander.stein@...tq-group.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,
        devicetree@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 00/11] fw_devlink improvements

Hi Maxim & Maxim,

saravanak@...gle.com wrote on Thu, 26 Jan 2023 16:11:27 -0800:

> 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 our more dynamically. The only expectation is that
>    fwnode 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.
> 
> Sorry it took a while to roll in the fixes I gave in the v1 series
> thread[1] into a v2 series.
> 
> Since I didn't make any additional changes on top of what I already gave
> in the v1 thread and Dmitry is very eager to get this series going, I'm
> sending it out without testing locally. I already tested these patches a
> few months ago as part of the v1 series. So I don't expect any major
> issues. I'll test them again on my end in the next few days and will
> report here if I actually find anything wrong.
> 
> Tony, Naresh, Abel, Sudeep, Geert,
> 
> I got the following reviewed by's and tested by's a few months back, but
> it's been 5 months since I sent out v1. So I wasn't sure if it was okay
> to include them in the v2 commits. Let me know if you are okay with this
> being included in the commits and/or if you want to test this series
> again.
> 
> Reviewed-by: Tony Lindgren <tony@...mide.com>
> Tested-by: Tony Lindgren <tony@...mide.com>
> Tested-by: Linux Kernel Functional Testing <lkft@...aro.org>
> Tested-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> Tested-by: Abel Vesa <abel.vesa@...aro.org>
> Tested-by: Sudeep Holla <sudeep.holla@....com>
> Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>
> 
> Dmitry, Maxim(s), Miquel, Luca, Doug, Colin, Martin, Jean-Philippe,
> 
> I've Cc-ed you because I had pointed you to v1 of this series + the
> patches in that thread at one point or another as a fix to some issue
> you were facing. It'd appreciate it if you can test this series and
> report any issues, or things it fixed and give Tested-bys.

Maxim & Maxim I would really appreciate if you could validate that the
original issue you had is solved with this version? I don't have any
hardware suffering from this issue.

> In addition, if you can also apply a revert of this series[2] and delete
> driver_deferred_probe_check_state() from your tree and see if you hit
> any issues and report them, that'd be great too! I'm pretty sure some of
> you will hit issues with that. I want to fix those next and then
> revert[2].
> 
> Thanks,
> Saravana
> 
> [1] - https://lore.kernel.org/lkml/20220810060040.321697-1-saravanak@google.com/
> [2] - https://lore.kernel.org/lkml/20220819221616.2107893-1-saravanak@google.com/
> [3] - https://lore.kernel.org/lkml/CAGETcx-JUV1nj8wBJrTPfyvM7=Mre5j_vkVmZojeiumUGG6QZQ@mail.gmail.com/
> 
> v1 -> v2:
> - Fixed Patch 1 to handle a corner case discussed in [3].
> - New patch 10 to handle "fsl,imx8mq-gpc" being initialized by 2 drivers.
> - New patch 11 to add fw_devlink support for SCMI devices.
> 
> Cc: Abel Vesa <abel.vesa@...aro.org>
> Cc: Alexander Stein <alexander.stein@...tq-group.com>
> Cc: Tony Lindgren <tony@...mide.com>
> Cc: Sudeep Holla <sudeep.holla@....com>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: John Stultz <jstultz@...gle.com>
> Cc: Doug Anderson <dianders@...omium.org>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Cc: Maxim Kiselev <bigunclemax@...il.com>
> Cc: Maxim Kochetkov <fido_max@...ox.ru>
> Cc: Miquel Raynal <miquel.raynal@...tlin.com>
> Cc: Luca Weiss <luca.weiss@...rphone.com>
> Cc: Colin Foster <colin.foster@...advantage.com>
> Cc: Martin Kepplinger <martin.kepplinger@...i.sm>
> Cc: Jean-Philippe Brucker <jpb@...nel.org>
> 
> Saravana Kannan (11):
>   driver core: fw_devlink: Don't purge child fwnode's consumer links
>   driver core: fw_devlink: Improve check for fwnode with no
>     device/driver
>   soc: renesas: Move away from using OF_POPULATED for fw_devlink
>   gpiolib: Clear the gpio_device's fwnode initialized flag before adding
>   driver core: fw_devlink: Add DL_FLAG_CYCLE support to device links
>   driver core: fw_devlink: Allow marking a fwnode link as being part of
>     a cycle
>   driver core: fw_devlink: Consolidate device link flag computation
>   driver core: fw_devlink: Make cycle detection more robust
>   of: property: Simplify of_link_to_phandle()
>   irqchip/irq-imx-gpcv2: Mark fwnode device as not initialized
>   firmware: arm_scmi: Set fwnode for the scmi_device
> 
>  drivers/base/core.c             | 443 +++++++++++++++++++++-----------
>  drivers/firmware/arm_scmi/bus.c |   2 +
>  drivers/gpio/gpiolib.c          |   6 +
>  drivers/irqchip/irq-imx-gpcv2.c |   1 +
>  drivers/of/property.c           |  84 +-----
>  drivers/soc/imx/gpcv2.c         |   1 +
>  drivers/soc/renesas/rcar-sysc.c |   2 +-
>  include/linux/device.h          |   1 +
>  include/linux/fwnode.h          |  12 +-
>  9 files changed, 332 insertions(+), 220 deletions(-)
> 


Thanks,
Miquèl

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