linux-kernel - Re: [PATCH V6 01/21] irqchip: tegra: Do not disable COP IRQ during suspend

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Message-ID: <20190725095502.GM12715@pdeschrijver-desktop.Nvidia.com>
Date:   Thu, 25 Jul 2019 12:55:02 +0300
From:   Peter De Schrijver <pdeschrijver@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>
CC:     Sowjanya Komatineni <skomatineni@...dia.com>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <tglx@...utronix.de>, <jason@...edaemon.net>,
        <marc.zyngier@....com>, <linus.walleij@...aro.org>,
        <stefan@...er.ch>, <mark.rutland@....com>, <pgaikwad@...dia.com>,
        <sboyd@...nel.org>, <linux-clk@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>, <jckuo@...dia.com>,
        <josephl@...dia.com>, <talho@...dia.com>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <mperttunen@...dia.com>, <spatra@...dia.com>, <robh+dt@...nel.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH V6 01/21] irqchip: tegra: Do not disable COP IRQ during
 suspend

On Mon, Jul 22, 2019 at 12:54:51PM +0300, Dmitry Osipenko wrote:
> 
> All Tegra SoCs support SC7, hence the 'supports_sc7' and the comment
> doesn't sound correct to me. Something like 'firmware_sc7' should suit
> better here.
> 
> > +			writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR);
> 
> Secondly, I'm also not sure why COP interrupts need to be disabled for
> pre-T210 at all, since COP is unused. This looks to me like it was
> cut-n-pasted from downstream kernel without a good reason and could be
> simply removed.

I don't think we can rely on the fact that COP is unused. People can
write their own code to run on COP.

Peter.