linux-kernel - Re: [RESEND PATCH v5 4/5] drm/bridge/sii8620: fix resource acquisition error handling

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Date:   Wed, 24 Jun 2020 15:11:39 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Andrzej Hajda <a.hajda@...sung.com>
Cc:     Jernej Skrabec <jernej.skrabec@...l.net>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-kernel@...r.kernel.org,
        "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jonas Karlman <jonas@...boo.se>, andy.shevchenko@...il.com,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        linux-arm-kernel@...ts.infradead.org,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [RESEND PATCH v5 4/5] drm/bridge/sii8620: fix resource
 acquisition error handling

On Wed, Jun 24, 2020 at 03:43:10PM +0200, Andrzej Hajda wrote:
> 
> On 24.06.2020 15:25, Mark Brown wrote:

> > If we silently ignore all deferred probe errors we make it hard for
> > anyone who is experiencing issues with deferred probe to figure out what
> > they're missing.  We should at least be logging problems at debug level
> > so there's something for people to go on without having to hack the
> > kernel source.

> But you can always do:

> cat /sys/kernel/debug/devices_deferred

> And you will find there deferred probe reason (thanks to patch 2/5).

Right, my point is more that we shouldn't be promoting discarding the
diagnostics entirely but rather saying that we want to redirect those
somewhere else.

> Eventually if you want it in dmesg anyway, one can adjust probe_err function
> to log probe error on debug level as well.

That would most likely be very useful as a boot option for problems that
occur before we get a console up.

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