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

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Message-ID: <159835044855.334488.7962570422326622972@swboyd.mtv.corp.google.com>
Date:   Tue, 25 Aug 2020 03:14:08 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Maulik Shah <mkshah@...eaurora.org>, bjorn.andersson@...aro.org,
        evgreen@...omium.org, linus.walleij@...aro.org, maz@...nel.org,
        mka@...omium.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-gpio@...r.kernel.org, agross@...nel.org, tglx@...utronix.de,
        jason@...edaemon.net, dianders@...omium.org, rnayak@...eaurora.org,
        ilina@...eaurora.org, lsrao@...eaurora.org,
        Maulik Shah <mkshah@...eaurora.org>
Subject: Re: [PATCH v5 6/6] irqchip: qcom-pdc: Reset PDC interrupts during init

Quoting Maulik Shah (2020-08-22 09:17:01)
> 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.

Presumably they're not in use anymore if the kernel has been kexeced and
replaced this one?

> 
> Suggested-by: Stephen Boyd <swboyd@...omium.org>
> Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>