linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Saravana Kannan <saravanak@google.com>
To: Amit Pundir <amit.pundir@linaro.org>
Cc: Russell King <linux@armlinux.org.uk>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Magnus Damm <magnus.damm@gmail.com>,
	Tony Lindgren <tony@atomide.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Damien Le Moal <damien.lemoal@wdc.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	Android Kernel Team <kernel-team@android.com>,
	linux-arm-kernel@lists.infradead.org,
	lkml <linux-kernel@vger.kernel.org>,
	linux-oxnas@groups.io, linux-renesas-soc@vger.kernel.org,
	linux-omap@vger.kernel.org, linux-riscv@lists.infradead.org,
	Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
	John Stultz <john.stultz@linaro.org>
Subject: Re: [PATCH v4 2/2] drivers: bus: Delete CONFIG_SIMPLE_PM_BUS
Date: Thu, 21 Oct 2021 16:42:34 -0700	[thread overview]
Message-ID: <CAGETcx_YZOd05Gg53ZR8mfVhFUzwQWo4MrrWF8JHF_DCwEtunw@mail.gmail.com> (raw)
In-Reply-To: <CAMi1Hd0HvPOT277mx8hNTU9NQH2ti7h5qc5+rxOkRWwbfrhyQQ@mail.gmail.com>

On Thu, Oct 21, 2021 at 4:21 AM Amit Pundir <amit.pundir@linaro.org> wrote:
>
> Hi Saravana,
>
> This patch broke v5.15-rc6 on RB5 (sm8250 | qcom/qrb5165-rb5.dts).
> I can't boot past this point https://www.irccloud.com/pastebin/raw/Nv6ZwHmW.

Amit top posting? How did that happen? :)

The fact you are seeing this issue is super strange though. The driver
literally does nothing other than allowing some sync_state() callbacks
to happen. I also grepped for the occurence of "simple-bus" in
arch/arm64/boot/dts/qcom/ and the only instance for 8250 is for the
soc node.

The only thing I can think of is that without my patch some
sync_state() callbacks weren't getting called and maybe it was masking
some other issue.

Can you try to boot with this log (see log patch below) and see if the
device hangs right after a sync_state() callback? Also, looking at the
different sync_state() implementations in upstream, I'm guessing one
of the devices isn't voting for interconnect bandwidth when it should
have.

Another thing you could do is boot without the simple-bus changes and
then look for all instances of "state_synced" in /sys/devices and then
see if any of them has the value "0" after boot up is complete.

-Saravana

-- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1099,6 +1099,7 @@ static void device_links_flush_sync_list(struct
list_head *list,
                if (dev != dont_lock_dev)
                        device_lock(dev);

+               dev_info(dev, "Calling sync_state()\n");
                if (dev->bus->sync_state)
                        dev->bus->sync_state(dev);
                else if (dev->driver && dev->driver->sync_state)

  parent reply	other threads:[~2021-10-21 23:43 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-29  0:07 [PATCH v4 0/2] Fix simple-bus issues with fw_devlink Saravana Kannan
2021-09-29  0:07 ` [PATCH v4 1/2] drivers: bus: simple-pm-bus: Add support for probing simple bus only devices Saravana Kannan
2021-10-05 15:07   ` Geert Uytterhoeven
2021-11-10 12:16   ` Abel Vesa
2021-11-10 20:24     ` Saravana Kannan
2021-11-15 20:17       ` Saravana Kannan
2021-11-16  5:19         ` Tony Lindgren
2021-11-16 13:59         ` Abel Vesa
2021-11-16 15:11           ` Abel Vesa
2021-11-19 16:16             ` Abel Vesa
2021-11-24  1:07               ` Saravana Kannan
2022-02-01  3:18   ` Kevin Hilman
2022-02-01  5:30     ` Saravana Kannan
2022-02-01 18:36       ` Kevin Hilman
2022-02-02 19:58         ` Kevin Hilman
2021-09-29  0:07 ` [PATCH v4 2/2] drivers: bus: Delete CONFIG_SIMPLE_PM_BUS Saravana Kannan
2021-10-05 15:11   ` Geert Uytterhoeven
2021-10-21 11:21   ` Amit Pundir
2021-10-21 12:37     ` Tony Lindgren
2021-10-21 23:42     ` Saravana Kannan [this message]
2021-10-22 16:59       ` Amit Pundir
2021-10-26  0:30         ` Saravana Kannan
2021-10-26 17:49           ` Amit Pundir
2021-09-30  2:50 ` [PATCH v4 0/2] Fix simple-bus issues with fw_devlink Damien Le Moal
2021-10-06  5:29 ` Tony Lindgren

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=CAGETcx_YZOd05Gg53ZR8mfVhFUzwQWo4MrrWF8JHF_DCwEtunw@mail.gmail.com \
    --to=saravanak@google.com \
    --cc=amit.pundir@linaro.org \
    --cc=catalin.marinas@arm.com \
    --cc=damien.lemoal@wdc.com \
    --cc=dmitry.baryshkov@linaro.org \
    --cc=geert+renesas@glider.be \
    --cc=gregkh@linuxfoundation.org \
    --cc=john.stultz@linaro.org \
    --cc=kernel-team@android.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-omap@vger.kernel.org \
    --cc=linux-oxnas@groups.io \
    --cc=linux-renesas-soc@vger.kernel.org \
    --cc=linux-riscv@lists.infradead.org \
    --cc=linux@armlinux.org.uk \
    --cc=magnus.damm@gmail.com \
    --cc=narmstrong@baylibre.com \
    --cc=robh+dt@kernel.org \
    --cc=tony@atomide.com \
    --cc=ulf.hansson@linaro.org \
    --cc=will@kernel.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).