linux-kernel - Re: [PATCHv3] w1: omap-hdq: Simplify driver with PM runtime autosuspend

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Message-ID: <20200416220449.17068b21@aktux>
Date:   Thu, 16 Apr 2020 22:04:49 +0200
From:   Andreas Kemnade <andreas@...nade.info>
To:     Tony Lindgren <tony@...mide.com>
Cc:     "H. Nikolaus Schaller" <hns@...delico.com>,
        Evgeniy Polyakov <zbr@...emap.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        Adam Ford <aford173@...il.com>,
        "Andrew F . Davis" <afd@...com>, Vignesh R <vigneshr@...com>
Subject: Re: [PATCHv3] w1: omap-hdq: Simplify driver with PM runtime
 autosuspend

On Thu, 16 Apr 2020 11:46:38 -0700
Tony Lindgren <tony@...mide.com> wrote:

> * H. Nikolaus Schaller <hns@...delico.com> [200416 15:04]:
> > Hi Tony,
> > it looks as if something with this patch is broken on GTA04. For v5.6 and v5.7-rc1.
> > 
> > HDQ battery access times out after ca. 15 seconds and I get temperature of -273.1°C...
> > 
> > Reverting this patch and everything is ok again.  
> 
> Hmm OK interesting.
> 
> > What is "ti,mode" about? Do we have that (indirectly) in gta04.dtsi?
> > Or does this patch need some CONFIGs we do not happen to have?  
> 
> Sounds like you have things working though so there should be no
> need for having ti,mode = "1w" in the dts.
> 
> > > 	pm_runtime_enable(&pdev->dev);
> > > +	pm_runtime_use_autosuspend(&pdev->dev);
> > > +	pm_runtime_set_autosuspend_delay(&pdev->dev, 300);  
> 
> Care to check if changing pm_runtime_set_autosuspend_delay value
> to -1 in probe makes the issue go away? Or change it manually
> to -1 via sysfs.
> 
> If that helps, likely we have a missing pm_runtime_get_sync()
> somewhere in the driver.
> 
I have not tested yet with v5.7-rc1 (it is compiling right now),
but I have not seen any problems with init=/bin/bash on v5.6
and only a minimal set of modules loaded on gta04. I have seen that
42 for IDLEST

So might be something a bit more weird.

Regards,
Andreas