linux-kernel - Re: [PATCH v6 3/6] genirq/PM: Introduce IRQCHIP_ENABLE_WAKEUP_ON

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Date:   Mon, 28 Sep 2020 14:12:46 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Maulik Shah <mkshah@...eaurora.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Marc Zyngier <maz@...nel.org>,
        LinusW <linus.walleij@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Evan Green <evgreen@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Andy Gross <agross@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Lina Iyer <ilina@...eaurora.org>,
        Srinivas Rao L <lsrao@...eaurora.org>
Subject: Re: [PATCH v6 3/6] genirq/PM: Introduce IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND
 flag

Hi,

On Sun, Sep 27, 2020 at 9:32 PM Maulik Shah <mkshah@...eaurora.org> wrote:
>
> An interrupt that is disabled/masked but set for wakeup still needs to
> be able to wake up the system from sleep states like "suspend to RAM".
>
> This change introduces IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND flag. If irqchip
> have this flag set then irq PM will enable/unmask irqs that are marked
> for wakeup but are in disabled state.
>
> On resume such irqs will be restored back to disabled state.
>
> Suggested-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
> ---
>  include/linux/irq.h  | 49 ++++++++++++++++++++++++++++++-------------------
>  kernel/irq/debugfs.c |  3 +++
>  kernel/irq/pm.c      | 34 ++++++++++++++++++++++++++++++----
>  3 files changed, 63 insertions(+), 23 deletions(-)

I will freely admit not being an expert on this code / knowing all the
subtle edge conditions, but this seems reasonable to me.

Reviewed-by: Douglas Anderson <dianders@...omium.org>