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

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Message-ID: <20200420150802.GR37466@atomide.com>
Date:   Mon, 20 Apr 2020 08:08:02 -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

* H. Nikolaus Schaller <hns@...delico.com> [200417 21:04]:
> To me it looks as if reading hqd too quickly after omap_hdq_runtime_resume()
> may be part of the problem, although it is 0.4 seconds between [   18.355163]
> and [   18.745269]. So I am not sure about my interpretation.
> 
> A different attempt for interpretation may be that trying to read the
> slave triggers omap_hdq_runtime_resume() just before doing the
> first hdq_read_byte().

Hmm so I wonder if adding msleep(100) at the end of
omap_hdq_runtime_resume() might help?

Regards,

Tony