linux-kernel - Re: [PATCH 1/2] extcon-intel-cht-wc: Make charger detection co-existed with OTG host mode

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Message-ID: <20190214070943.GB16597@jeknote.loshitsa1.net>
Date:   Thu, 14 Feb 2019 10:09:43 +0300
From:   Yauhen Kharuzhy <jekhor@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH 1/2] extcon-intel-cht-wc: Make charger detection
 co-existed with OTG host mode

On Thu, Feb 14, 2019 at 12:15:00AM +0100, Hans de Goede wrote:
> Hi,
> 
> On 10-02-19 21:36, Yauhen Kharuzhy wrote:
> > Whiskey Cove Cherry Trail PMIC requires disabling OTG host mode before
> > of charger detection procedure. Do this by manipulationg of CHGRCTRL1
> > register.
> > 
> > Source: APCI DSDT code of Lenovo Yoga Book YB1-X91L and open-sourced
> > Intel's drivers.
> 
> Hmm, of the ACPI code is updating the otg-mode, then there should be
> no reason for us to do this, can you provide an acpidump of your
> device please?

sure: https://github.com/jekhor/yogabook-linux/blob/master/yoga/acpi/yoga.acpidump.log

Yes, there is ACPI routine for switching this but it is not called at
IRQ handling because it is handled by extcon driver. See my notes here:
https://github.com/jekhor/yogabook-linux/blob/master/yoga/acpi/investigate.txt#L364


-- 
Yauhen Kharuzhy