linux-kernel - Re: [PATCH v1 0/3] Bring back driver_deferred_probe_check

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Date:   Mon, 15 Aug 2022 16:36:23 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Luca Weiss <luca.weiss@...rphone.com>
Cc:     Tony Lindgren <tony@...mide.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, naresh.kamboju@...aro.org,
        kernel-team@...roid.com, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v1 0/3] Bring back driver_deferred_probe_check_state() for now

On Mon, Aug 15, 2022 at 9:57 AM Luca Weiss <luca.weiss@...rphone.com> wrote:
>
> On Mon Aug 15, 2022 at 1:01 PM CEST, Tony Lindgren wrote:
> > * Saravana Kannan <saravanak@...gle.com> [700101 02:00]:
> > > More fixes/changes are needed before driver_deferred_probe_check_state()
> > > can be deleted. So, bring it back for now.
> > >
> > > Greg,
> > >
> > > Can we get this into 5.19? If not, it might not be worth picking up this
> > > series. I could just do the other/more fixes in time for 5.20.
> >
> > Yes please pick this as fixes for v6.0-rc series, it fixes booting for
> > me. I've replied with fixes tags for the two patches that were causing
> > regressions for me.
> >
>
> Hi,
>
> for me Patch 1+3 fix display probe on Qualcomm SM6350 (although display
> for this SoC isn't upstream yet, there are lots of other SoCs with very
> similar setup).
>
> Probe for DPU silently fails, with CONFIG_DEBUG_DRIVER=y we get this:
>
> msm-mdss ae00000.mdss: __genpd_dev_pm_attach() failed to find PM domain: -2
>
> While I'm not familiar with the specifics of fw_devlink, the dtsi has
> power-domains = <&dispcc MDSS_GDSC> for this node but it doesn't pick
> that up for some reason.
>
> We can also see that a bit later dispcc finally probes.

Luca,

Can you test with this series instead and see if it fixes this issue?
https://lore.kernel.org/lkml/20220810060040.321697-1-saravanak@google.com/

You might also need to add this delta on top of the series if the
series itself isn't sufficient.
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 2f012e826986..866755d8ad95 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2068,7 +2068,11 @@ static int fw_devlink_create_devlink(struct device *con,
                device_links_write_unlock();
        }

-       sup_dev = get_dev_from_fwnode(sup_handle);
+       if (sup_handle->flags & FWNODE_FLAG_NOT_DEVICE)
+               sup_dev = fwnode_get_next_parent_dev(sup_handle);
+       else
+               sup_dev = get_dev_from_fwnode(sup_handle);
+
        if (sup_dev) {
                /*
                 * If it's one of those drivers that don't actually bind to

-Saravana