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

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Message-Id: <CM6REZS9Z8AC.2KCR9N3EFLNQR@otso>
Date:   Mon, 15 Aug 2022 18:57:16 +0200
From:   "Luca Weiss" <luca.weiss@...rphone.com>
To:     "Tony Lindgren" <tony@...mide.com>,
        "Saravana Kannan" <saravanak@...gle.com>
Cc:     "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 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.

Regards
Luca

> Regards,
>
> Tony