linux-kernel - Re: Vibrations on Droid 4?

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Date:   Tue, 10 Jul 2018 12:11:47 +0200
From:   Sebastian Reichel <sre@...nel.org>
To:     Pavel Machek <pavel@....cz>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, nekit1000@...il.com,
        mpartap@....net, merlijn@...zup.org
Subject: Re: Vibrations on Droid 4?

Hi,

On Tue, Jul 10, 2018 at 12:02:11AM +0200, Pavel Machek wrote:
> Hi!
> 
> > > Do you have vibrations on d4 working?
> > > I believe I have required drivers enabled, but no luck:
> > > 
> > > user@...uan:/sys/bus/platform/drivers$ ls pwm-vibrator/
> > > bind  uevent  unbind
> > > user@...uan:/sys/bus/platform/drivers$ ls omap-dmtimer-pwm/
> > > bind  uevent  unbind
> > 
> > Have you checked probe deferrals?
> 
> Not really. Is there easier way to do that than adding printks in the
> probe function? (I can go through dmesg tommorow).

Option 1: https://lkml.org/lkml/2018/7/8/63

Option 2: dynamic debug via kernel commandline (needs CONFIG_DYNAMIC_DEBUG)

dyndbg="func deferred_probe_work_func +p; func driver_deferred_probe_add +p"

Option 3: use "initcall_debug" kernel commandline

-- Sebastian

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