linux-kernel - Re: [RFC][PATCH] pinctrl: Rework driver_deferred_probe_check_state() evaluation since default timeout has changed

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Message-ID: <20200907093206.GB1393659@kroah.com>
Date:   Mon, 7 Sep 2020 11:32:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>, linux-pm@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Thierry Reding <treding@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Todd Kjos <tkjos@...gle.com>, Len Brown <len.brown@...el.com>,
        Pavel Machek <pavel@....cz>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Kevin Hilman <khilman@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Rob Herring <robh@...nel.org>
Subject: Re: [RFC][PATCH] pinctrl: Rework driver_deferred_probe_check_state()
 evaluation since default timeout has changed

On Sat, Aug 08, 2020 at 04:35:12AM +0000, John Stultz wrote:
> In commit bec6c0ecb243 ("pinctrl: Remove use of
> driver_deferred_probe_check_state_continue()"), we removed the
> use of driver_deferred_probe_check_state_continue() which
> effectively never returned -ETIMED_OUT, with the
> driver_deferred_probe_check_state() function that had been
> reworked to properly return ETIMED_OUT when the deferred probe
> timeout expired. Along with that change, we set the default
> timeout to 30 seconds.
> 
> However, since moving the timeout to 30 seconds caused some
> issues for some users with optional dt links, we set the
> default timeout back to zero - see commit ce68929f07de ("driver
> core: Revert default driver_deferred_probe_timeout value to 0")
> 
> This in essence changed the behavior of the pinctrl's usage
> of driver_deferred_probe_check_state(), as it now would return
> ETIMED_OUT by default. Thierry reported this caused problems with
> resume on tegra platforms.
> 
> Thus this patch tweaks the pinctrl logic so that it behaves as
> before. If modules are enabled, we'll only return EPROBE_DEFERRED
> while we're missing drivers linked in the DT.
> 
> Cc: linux-pm@...r.kernel.org
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Thierry Reding <treding@...dia.com>
> Cc: Mark Brown <broonie@...nel.org>
> Cc: Liam Girdwood <lgirdwood@...il.com>
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Saravana Kannan <saravanak@...gle.com>
> Cc: Todd Kjos <tkjos@...gle.com>
> Cc: Len Brown <len.brown@...el.com>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>
> Cc: Kevin Hilman <khilman@...nel.org>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Rob Herring <robh@...nel.org>
> Fixes: bec6c0ecb243 ("pinctrl: Remove use of driver_deferred_probe_check_state_continue()")
> Fixes: ce68929f07de ("driver core: Revert default driver_deferred_probe_timeout value to 0")
> Reported-by: Thierry Reding <thierry.reding@...il.com>
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
>  drivers/pinctrl/devicetree.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>