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

[Peter De Schrijver]

On Thu, Jul 25, 2019 at 01:05:13PM +0300, Dmitry Osipenko wrote:
> 25.07.2019 12:55, Peter De Schrijver ÐÐÑÐÑ:
> > 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.
> 
> 1. Not upstream - doesn't matter.
> 

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.