linux-kernel - Re: [PATCH v1 1/1] pinctrl: intel: Save and restore pins in "direct IRQ" mode

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Date:   Fri, 25 Nov 2022 08:11:14 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Shevchenko <andy@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        stable@...r.kernel.org, Dale Smith <dalepsmith@...il.com>,
        John Harris <jmharris@...il.com>
Subject: Re: [PATCH v1 1/1] pinctrl: intel: Save and restore pins in "direct
 IRQ" mode

On Fri, Nov 25, 2022 at 12:29:26AM +0200, Andy Shevchenko wrote:
> The firmware on some systems may configure GPIO pins to be
> an interrupt source in so called "direct IRQ" mode. In such
> cases the GPIO controller driver has no idea if those pins
> are being used or not. At the same time, there is a known bug
> in the firmwares that don't restore the pin settings correctly
> after suspend, i.e. by an unknown reason the Rx value becomes
> inverted.
> 
> Hence, let's save and restore the pins that are configured
> as GPIOs in the input mode with GPIROUTIOXAPIC bit set.
> 
> Cc: stable@...r.kernel.org
> Reported-and-tested-by: Dale Smith <dalepsmith@...il.com>
> Reported-and-tested-by: John Harris <jmharris@...il.com>
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=214749
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Thanks Andy!

Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>