linux-kernel - Re: [PATCH] pinctrl: intel: Configure GPIO chip IRQ as wakeup interrupts

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 7 Oct 2016 22:40:42 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Bacchewar, Nilesh" <nilesh.bacchewar@...el.com>
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        "Krogerus, Heikki" <heikki.krogerus@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: intel: Configure GPIO chip IRQ as wakeup interrupts

On Fri, Oct 7, 2016 at 9:17 PM, Bacchewar, Nilesh
<nilesh.bacchewar@...el.com> wrote:
> Here, Its marking  GPIO controller IRQ line as wake capable not GPIO lines.

AFAIU this is called per (GPIO) pin which is IRQ enabled.

Imagine a case when you have more than one such pin.

1. Set IRQ wake for pin 1
2. Set IRQ wake for pin 2 (assume that is pin under the question)
3. Unset IRQ wake for pin 1 (for some reason)
4. Global pinctrl IRQ wake is unset. Resulting same issue as before.

What did I miss above?

>
> Regards,
> Nilesh
>
> -----Original Message-----
> From: Andy Shevchenko [mailto:andy.shevchenko@...il.com]
> Sent: Friday, October 7, 2016 10:59 AM
> To: Bacchewar, Nilesh <nilesh.bacchewar@...el.com>
> Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>; Krogerus, Heikki <heikki.krogerus@...ux.intel.com>; Linus Walleij <linus.walleij@...aro.org>; linux-gpio@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] pinctrl: intel: Configure GPIO chip IRQ as wakeup interrupts
>
> On Thu, Sep 22, 2016 at 2:03 AM, Nilesh Bacchewar <nilesh.bacchewar@...el.com> wrote:
>> On some Intel BXT platform, wake-up from suspend-to-idle on pressing
>> power-button is not working. Its noticed that gpio-keys driver marking
>> the second level IRQ/power-button as wake capable but Intel pintctrl
>> driver is missing to mark GPIO chip/controller IRQ which first level
>> IRQ as wake cable if its GPIO pin IRQ is wakeble. So, though the first
>> level IRQ gets generated on power-button press, since it is not marked
>> as wake capable resume/wake-up flow is not happening.
>> Intel pintctrl/GPIO driver need to mark GPIO chip/controller IRQ
>> (first level IRQ) as wake capable iff GPIO pin's IRQ (second level
>> IRQ) is marked as wake cable.
>
>>         if (on)
>> -               gpe_en |= BIT(gpp_offset);
>> +               enable_irq_wake(pctrl->irq);
>>         else
>> -               gpe_en &= ~BIT(gpp_offset);
>> -       writel(gpe_en, community->regs + GPI_GPE_EN + gpp * 4);
>> -
>> -       raw_spin_unlock_irqrestore(&pctrl->lock, flags);
>> +               disable_irq_wake(pctrl->irq);
>
> Shouldn't be refcounting here or I missed something?
> What I think of is 2+ GPIO lines marked as wake capable IRQ sources and one of them is disabled earlier by some reason.
>
> --
> With Best Regards,
> Andy Shevchenko



-- 
With Best Regards,
Andy Shevchenko