linux-kernel - Re: [PATCH v2 2/9] irqchip/sun6i-r: Add wakeup support

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Date:   Mon, 8 Jun 2020 10:49:17 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 2/9] irqchip/sun6i-r: Add wakeup support

On Sun, May 24, 2020 at 11:12:55PM -0500, Samuel Holland wrote:
> Maintain a mask of wake-enabled IRQs, and enable them in hardware
> during the syscore phase of suspend. The restore the original mask
> of enabled IRQs (just the NMI) during resume.
> 
> This serves two purposes. First, it lets power management firmware
> running on the ARISC coprocessor know which wakeup sources Linux wants
> to have enabled. That way, it can avoid turning them off when it shuts
> down the remainder of the clock tree. Second, it preconfigures the
> coprocessor's interrupt controller, so the firmware's wakeup logic
> is as simple as waiting for an interrupt to arrive.
> 
> Signed-off-by: Samuel Holland <samuel@...lland.org>

Acked-by: Maxime Ripard <mripard@...nel.org>

Maxime

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