From: Tony Lindgren <tony@atomide.com>
To: Saravana Kannan <saravanak@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Kevin Hilman <khilman@kernel.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
Andrew Lunn <andrew@lunn.ch>,
Heiner Kallweit <hkallweit1@gmail.com>,
Russell King <linux@armlinux.org.uk>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Linus Walleij <linus.walleij@linaro.org>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
David Ahern <dsahern@kernel.org>,
kernel-team@android.com, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org, iommu@lists.linux-foundation.org,
netdev@vger.kernel.org, linux-gpio@vger.kernel.org,
Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Re: [PATCH v2 1/9] PM: domains: Delete usage of driver_deferred_probe_check_state()
Date: Thu, 23 Jun 2022 10:01:48 +0300 [thread overview]
Message-ID: <YrQP3OZbe8aCQxKU@atomide.com> (raw)
In-Reply-To: <CAGETcx_11wO-HkZ2QsBF8o1+L9L3Xe1QBQ_GzegwozxAx1i0jg@mail.gmail.com>
* Saravana Kannan <saravanak@google.com> [220622 19:05]:
> On Tue, Jun 21, 2022 at 9:59 PM Tony Lindgren <tony@atomide.com> wrote:
> >
> > Hi,
> >
> > * Saravana Kannan <saravanak@google.com> [220621 19:29]:
> > > On Tue, Jun 21, 2022 at 12:28 AM Tony Lindgren <tony@atomide.com> wrote:
> > > >
> > > > Hi,
> > > >
> > > > * Saravana Kannan <saravanak@google.com> [700101 02:00]:
> > > > > Now that fw_devlink=on by default and fw_devlink supports
> > > > > "power-domains" property, the execution will never get to the point
> > > > > where driver_deferred_probe_check_state() is called before the supplier
> > > > > has probed successfully or before deferred probe timeout has expired.
> > > > >
> > > > > So, delete the call and replace it with -ENODEV.
> > > >
> > > > Looks like this causes omaps to not boot in Linux next.
> > >
> > > Can you please point me to an example DTS I could use for debugging
> > > this? I'm assuming you are leaving fw_devlink=on and not turning it
> > > off or putting it in permissive mode.
> >
> > Sure, this seems to happen at least with simple-pm-bus as the top
> > level interconnect with a configured power-domains property:
> >
> > $ git grep -A10 "ocp {" arch/arm/boot/dts/*.dtsi | grep -B3 -A4 simple-pm-bus
>
> Thanks for the example. I generally start looking from dts (not dtsi)
> files in case there are some DT property override/additions after the
> dtsi files are included in the dts file. But I'll assume for now
> that's not the case. If there's a specific dts file for a board I can
> look from that'd be helpful to rule out those kinds of issues.
>
> For now, I looked at arch/arm/boot/dts/omap4.dtsi.
OK it should be very similar for all the affected SoCs.
> > This issue is no directly related fw_devlink. It is a side effect of
> > removing driver_deferred_probe_check_state(). We no longer return
> > -EPROBE_DEFER at the end of driver_deferred_probe_check_state().
>
> Yes, I understand the issue. But driver_deferred_probe_check_state()
> was deleted because fw_devlink=on should have short circuited the
> probe attempt with an -EPROBE_DEFER before reaching the bus/driver
> probe function and hitting this -ENOENT failure. That's why I was
> asking the other questions.
OK. So where is the -EPROBE_DEFER supposed to happen without
driver_deferred_probe_check_state() then?
> > > > On platform_probe() genpd_get_from_provider() returns
> > > > -ENOENT.
> > >
> > > This error is with the series I assume?
> >
> > On the first probe genpd_get_from_provider() will return -ENOENT in
> > both cases. The list is empty on the first probe and there are no
> > genpd providers at this point.
> >
> > Earlier with driver_deferred_probe_check_state(), the initial -ENOENT
> > ends up getting changed to -EPROBE_DEFER at the end of
> > driver_deferred_probe_check_state(), we are now missing that.
>
> Right, I was aware -ENOENT would be returned if we got this far. But
> the point of this series is that you shouldn't have gotten that far
> before your pm domain device is ready. Hence my questions from the
> earlier reply.
OK
> Can I get answers to rest of my questions in the first reply please?
> That should help us figure out why fw_devlink let us get this far.
> Summarize them here to make it easy:
> * Are you running with fw_devlink=on?
Yes with the default with no specific kernel params so looks like
FW_DEVLINK_FLAGS_ON.
> * Is the"ti,omap4-prm-inst"/"ti,omap-prm-inst" built-in in this case?
Yes
> * If it's not built-in, can you please try deferred_probe_timeout=0
> and deferred_probe_timeout=30 and see if either one of them help?
It's built in so I did not try these.
> * Can I get the output of "ls -d supplier:*" and "cat
> supplier:*/status" output from the sysfs dir for the ocp device
> without this series where it boots properly.
Hmm so I'm not seeing any supplier for the top level ocp device in
the booting case without your patches. I see the suppliers for the
ocp child device instances only.
Without your patches I see simple-pm-bus probe initially with
EPROBE_DEFER like I described earlier, and then simple-pm-bus probes
on the second try.
Regards,
Tony
next prev parent reply other threads:[~2022-06-23 7:01 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-01 7:06 [PATCH v2 0/9] deferred_probe_timeout logic clean up Saravana Kannan
2022-06-01 7:06 ` [PATCH v2 1/9] PM: domains: Delete usage of driver_deferred_probe_check_state() Saravana Kannan
2022-06-09 11:44 ` Ulf Hansson
2022-06-09 19:29 ` Saravana Kannan
2022-06-21 7:28 ` Tony Lindgren
2022-06-21 19:34 ` Saravana Kannan
2022-06-22 4:58 ` Tony Lindgren
2022-06-22 19:09 ` Saravana Kannan
2022-06-23 7:01 ` Tony Lindgren [this message]
2022-06-23 8:21 ` Saravana Kannan
2022-06-27 9:10 ` Tony Lindgren
2022-06-30 23:10 ` Saravana Kannan
2022-06-30 23:26 ` Rob Herring
2022-06-30 23:30 ` Saravana Kannan
2022-07-01 5:33 ` Tony Lindgren
2022-07-01 6:12 ` Tony Lindgren
2022-07-01 8:10 ` Saravana Kannan
2022-07-01 8:26 ` Saravana Kannan
2022-07-01 13:00 ` Tony Lindgren
2022-07-12 7:12 ` Tony Lindgren
2022-07-13 0:49 ` Saravana Kannan
2022-07-13 8:06 ` Tony Lindgren
2022-07-01 15:08 ` Sudeep Holla
2022-07-01 19:13 ` Saravana Kannan
2022-07-05 8:44 ` Saravana Kannan
2022-07-01 7:38 ` Geert Uytterhoeven
2022-06-23 12:08 ` Alexander Stein
2022-07-01 0:37 ` Saravana Kannan
2022-07-01 6:01 ` (EXT) " Alexander Stein
2022-07-01 7:02 ` Saravana Kannan
2022-07-04 7:07 ` (EXT) " Alexander Stein
2022-07-05 1:24 ` Saravana Kannan
2022-07-06 13:02 ` Re: " Alexander Stein
2022-07-13 0:45 ` Saravana Kannan
2022-07-14 6:41 ` Alexander Stein
2022-07-15 22:08 ` Saravana Kannan
2022-07-01 7:30 ` Geert Uytterhoeven
2022-06-01 7:06 ` [PATCH v2 2/9] pinctrl: devicetree: " Saravana Kannan
2022-06-01 7:06 ` [PATCH v2 3/9] net: mdio: " Saravana Kannan
2022-07-05 9:11 ` Geert Uytterhoeven
2022-07-13 1:40 ` Saravana Kannan
2022-07-13 11:39 ` Geert Uytterhoeven
2022-08-15 8:38 ` Geert Uytterhoeven
2022-06-01 7:07 ` [PATCH v2 4/9] driver core: Add wait_for_init_devices_probe helper function Saravana Kannan
2022-06-01 7:07 ` [PATCH v2 5/9] net: ipconfig: Relax fw_devlink if we need to mount a network rootfs Saravana Kannan
2022-06-01 7:07 ` [PATCH v2 6/9] Revert "driver core: Set default deferred_probe_timeout back to 0." Saravana Kannan
2022-07-20 17:31 ` Geert Uytterhoeven
2022-07-20 19:01 ` Saravana Kannan
2022-07-21 8:40 ` Geert Uytterhoeven
2022-06-01 7:07 ` [PATCH v2 7/9] driver core: Set fw_devlink.strict=1 by default Saravana Kannan
2022-06-22 7:47 ` Sascha Hauer
2022-06-22 8:44 ` Linus Walleij
2022-06-22 10:52 ` Andy Shevchenko
2022-06-22 11:18 ` Sascha Hauer
2022-06-22 19:40 ` Saravana Kannan
2022-06-22 20:35 ` Saravana Kannan
2022-06-22 22:30 ` Saravana Kannan
2022-06-28 13:09 ` Linus Walleij
2022-06-01 7:07 ` [PATCH v2 8/9] iommu/of: Delete usage of driver_deferred_probe_check_state() Saravana Kannan
2022-08-19 14:26 ` Jean-Philippe Brucker
2022-06-01 7:07 ` [PATCH v2 9/9] driver core: Delete driver_deferred_probe_check_state() Saravana Kannan
2022-06-07 18:07 ` [PATCH v2 0/9] deferred_probe_timeout logic clean up Geert Uytterhoeven
2022-06-08 0:55 ` Saravana Kannan
2022-06-08 4:17 ` Saravana Kannan
2022-06-08 10:25 ` Geert Uytterhoeven
2022-06-08 18:12 ` Saravana Kannan
2022-06-08 18:47 ` Geert Uytterhoeven
2022-06-08 21:07 ` Saravana Kannan
2022-06-08 22:49 ` Jakub Kicinski
2022-06-08 23:15 ` Saravana Kannan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YrQP3OZbe8aCQxKU@atomide.com \
--to=tony@atomide.com \
--cc=andrew@lunn.ch \
--cc=davem@davemloft.net \
--cc=dsahern@kernel.org \
--cc=edumazet@google.com \
--cc=geert@linux-m68k.org \
--cc=gregkh@linuxfoundation.org \
--cc=hkallweit1@gmail.com \
--cc=iommu@lists.linux-foundation.org \
--cc=joro@8bytes.org \
--cc=kernel-team@android.com \
--cc=khilman@kernel.org \
--cc=kuba@kernel.org \
--cc=len.brown@intel.com \
--cc=linus.walleij@linaro.org \
--cc=linux-gpio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
--cc=pavel@ucw.cz \
--cc=rafael@kernel.org \
--cc=saravanak@google.com \
--cc=ulf.hansson@linaro.org \
--cc=will@kernel.org \
--cc=yoshfuji@linux-ipv6.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).