linux-kernel - Re: [PATCH] pinctrl: intel: save HOSTSW

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Date:   Tue, 21 Nov 2017 14:04:22 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Chris Chiu <chiu@...lessm.com>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: [PATCH] pinctrl: intel: save HOSTSW_OWN register over
 suspend/resume

On Tue, Nov 21, 2017 at 07:54:26PM +0800, Chris Chiu wrote:
> Yup, I checked the value of the corresponded pin. It shows following before
> suspend
> pin 18 (GPIO_18) GPIO 0x40800102 0x00024075
> 
> Then after resume
> pin 18 (GPIO_18) GPIO 0x40800102 0x00024075 [ACPI]

OK, so ownership is changed to ACPI.

> What else register do you suggest me to compare? The PADCFG2 is invalid

It's fine APL does not have PADCFG2.

Hmm, I don't understand how this can work in Windows either. The Windows
people told me that they don't save and restore anything else than
padcfg registers + ie. If the ownership is changed to ACPI it means you
don't get interrupts anymore (only GPEs) and that applies to Windows as
well.