linux-kernel - Re: [PATCH] pinctrl: intel: remap the pin number to gpio offset for irq enabled pin

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Date:   Mon, 19 Aug 2019 12:42:52 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Chris Chiu <chiu@...lessm.com>, linus.walleij@...aro.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux@...lessm.com
Subject: Re: [PATCH] pinctrl: intel: remap the pin number to gpio offset for
 irq enabled pin

On Mon, Aug 19, 2019 at 10:14:13AM +0300, Mika Westerberg wrote:
> On Fri, Aug 16, 2019 at 05:38:38PM +0800, Chris Chiu wrote:
> > On Asus X571GT, GPIO 297 is configured as an interrupt and serves
> > for the touchpad. The touchpad will report input events much less
> > than expected after S3 suspend/resume, which results in extremely
> > slow cursor movement. However, the number of interrupts observed
> > from /proc/interrupts increases much more than expected even no
> > touching touchpad.
> > 
> > This is due to the value of PADCFG0 of PIN 225 for the interrupt
> > has been changed from 0x80800102 to 0x80100102. The GPIROUTIOXAPIC
> > is toggled on which results in the spurious interrupts. The PADCFG0
> > of PIN 225 is expected to be saved during suspend, but the 297 is
> > saved instead because the gpiochip_line_is_irq() expect the GPIO
> > offset but what's really passed to it is PIN number. In this case,
> > the /sys/kernel/debug/pinctrl/INT3450:00/gpio-ranges shows
> > 
> > 288: INT3450:00 GPIOS [436 - 459] PINS [216 - 239]
> > 
> > So gpiochip_line_is_irq() returns true for GPIO offset 297, the
> > suspend routine spuriously saves the content for PIN 297 which
> > we expect to save for PIN 225.
> 
> Nice work nailing the issue!
> 
> > This commit maps the PIN number to GPIO offset first in the
> > intel_pinctrl_should_save() to make sure the values for the
> > specific PINs can be correctly saved and then restored.
> > 
> > Signed-off-by: Chris Chiu <chiu@...lessm.com>
> 
> Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> 
> I think this should also have:
> 
> Fixes: c538b9436751 ("pinctrl: intel: Only restore pins that are used by the driver")

Pushed to my review and testing queue, thanks!

P.S. I have added Fixes tag.

-- 
With Best Regards,
Andy Shevchenko