linux-kernel - Re: [PATCH 1/3] irqchip: qcom-pdc: Fix phantom irq when changing between rising/falling

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Message-ID: <CAD=FV=UdExXYaf3K6jbyr8tR3_NEib+BaYtxk1xQzS7-DuLC-g@mail.gmail.com>
Date:   Tue, 24 Nov 2020 09:46:00 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Maulik Shah <mkshah@...eaurora.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Srinivas Ramana <sramana@...eaurora.org>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Andy Gross <agross@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] irqchip: qcom-pdc: Fix phantom irq when changing
 between rising/falling

Hi,

On Tue, Nov 24, 2020 at 9:42 AM Maulik Shah <mkshah@...eaurora.org> wrote:
>
> Hi Linus,
>
> +        * When we change types the PDC can give a phantom interrupt.
> +        * Clear it.  Specifically the phantom shows up if a line is already
> +        * high and we change to rising or if a line is already low and we
> +        * change to falling but let's be consistent and clear it always.
> +        *
>
> Can you please hold this change. I am checking with HW folks if above
> commented behaviour is expected/is valid case to set the irq type rising
> edge when the line is already high.
>
> Will keep posting update here.
>
> Thanks,
> Maulik

Thanks for the update.  I'm still going to post a v2 because I think
patch #1 in the series should land and it seems nice to keep them
together.  I'll add a note to the patch indicating your request to
wait for an ack before landing.

-Doug