linux-kernel - Re: [PATCH v1 1/2] irqchip/tegra: Remove everything related to COP

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Message-ID: <86blwtnnwd.wl-maz@kernel.org>
Date:   Tue, 13 Aug 2019 15:25:06 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] irqchip/tegra: Remove everything related to COP

On Sun, 11 Aug 2019 19:30:43 +0100,
Dmitry Osipenko <digetx@...il.com> wrote:
> 
> There is no point in touching of the COP (ARM7TDMI auxiliary boot/firmware
> CPU) because COP's interrupts should be related only to an old multimedia
> firmware that is not applicable to the upstream kernel. Hence let's remove
> everything related to the COP, for consistency.

We've had that exact discussion a few weeks ago, and I objected to
this change as there is no possible way you can know for sure people
don't use mainline with an old firmware. The whole point of the
firmware is to be an abstraction for the kernel, for better or worse.

If you really want to do something useful here, consider detecting
such firmware (even better, detect the new ones that don't require
this stuff) and document the various requirements. At least we'll know
where we stand, because the changes you're making are just as random
as what we have so far.

Thanks,

	M.

-- 
Jazz is not dead, it just smells funny.