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Date:   Thu, 25 Jul 2019 13:33:48 +0300
From:   Peter De Schrijver <pdeschrijver@nvidia.com>
To:     Dmitry Osipenko <digetx@gmail.com>
CC:     Sowjanya Komatineni <skomatineni@nvidia.com>,
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Subject: Re: [PATCH V6 01/21] irqchip: tegra: Do not disable COP IRQ during
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On Thu, Jul 25, 2019 at 01:05:13PM +0300, Dmitry Osipenko wrote:
> 25.07.2019 12:55, Peter De Schrijver =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
> > 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.
> >=20
> > I don't think we can rely on the fact that COP is unused. People can
> > write their own code to run on COP.
>=20
> 1. Not upstream - doesn't matter.
>=20

The code is not part of the kernel, so obviously it's not upstream?

> 2. That's not very good if something unknown is running on COP and then
> kernel suddenly intervenes, don't you think so?

Unless the code was written with this in mind.

Peter.