linux-kernel - Re: [PATCH 4/5] Input: omap4-keypad

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Message-ID: <X/vePMbD4fwsNb5Y@atomide.com>
Date:   Mon, 11 Jan 2021 07:12:28 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org,
        Arthur Demchenkov <spinal.by@...il.com>,
        Carl Philipp Klemm <philipp@...s.xyz>,
        Merlijn Wajer <merlijn@...zup.org>,
        Pavel Machek <pavel@....cz>, ruleh <ruleh@....de>,
        Sebastian Reichel <sre@...nel.org>
Subject: Re: [PATCH 4/5] Input: omap4-keypad - use PM runtime autosuspend

* Dmitry Torokhov <dmitry.torokhov@...il.com> [210111 05:01]:
> Hi Tony,
> 
> On Sun, Jan 10, 2021 at 09:05:28PM +0200, Tony Lindgren wrote:
> > @@ -350,15 +379,12 @@ static int omap4_keypad_probe(struct platform_device *pdev)
> >  
> >  	error = omap4_keypad_check_revision(&pdev->dev,
> >  					    keypad_data);
> > -	if (!error) {
> > -		/* Ensure device does not raise interrupts */
> > -		omap4_keypad_stop(keypad_data);
> > -	}
> > -
> > -	pm_runtime_put_sync(&pdev->dev);
> 
> Why are we moving this down? The idea was to make sure the power usage
> counters are correct even if we exit probe early.

Yes you are right, omap4_keypad_close() won't help with balancing the
get if we exit early.

> Can we call pm_runtime_mark_last_busy() and pm_runtime_put_autosuspend()
> here?

Yes that should work as there's no more register access during the probe.

Regards,

Tony