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

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Message-ID: <20200417151447.GM37466@atomide.com>
Date:   Fri, 17 Apr 2020 08:14:47 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Andreas Kemnade <andreas@...nade.info>,
        Evgeniy Polyakov <zbr@...emap.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-omap <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

* Tony Lindgren <tony@...mide.com> [200417 15:08]:
> Maybe the PM runtime usecounts get unbalanced somewhere in the
> driver where we end up with driver permanently in disabled state?

Or it could be that with omap_hdq.c no longer blocking SoC
deeper idle states, omap_hdq.c now loses context if you have
omap3 off mode enabled during idle?

If so, this can easily be fixed by adding a cpu_pm notifier
along the lines of what we already have for few drivers:

$ git grep -e CLUSTER_PM_ENTER -e CLUSTER_PM_EXIT

Regards,

Tony