linux-kernel - Re: [PATCH v5 6/6] irqchip: qcom-pdc: Reset PDC interrupts during init

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Message-ID: <CAD=FV=XBidZvVit+P-HmQpxdi0XwD7uwkawJMCjPAp715Cg=4g@mail.gmail.com>
Date:   Tue, 25 Aug 2020 13:00:04 -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 v5 6/6] irqchip: qcom-pdc: Reset PDC interrupts during init

Hi,

On Sat, Aug 22, 2020 at 9:18 AM Maulik Shah <mkshah@...eaurora.org> wrote:
>
> Kexec can directly boot into a new kernel without going to complete
> reboot. This can leave the previous kernel's configuration for PDC
> interrupts as is.
>
> Clear previous kernel's configuration during init by setting interrupts
> in enable bank to zero. The IRQs specified in qcom,pdc-ranges property
> are the only ones that can be used by the new kernel so clear only those
> IRQs. The remaining ones may be in use by a different kernel and should
> not be set by new kernel.
>
> Suggested-by: Stephen Boyd <swboyd@...omium.org>
> Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
> ---
>  drivers/irqchip/qcom-pdc.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)

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