Re: [PATCH v2 09/16] reset: starfive-jh7100: Add StarFive JH7100 reset driver

[Andy Shevchenko]

On Fri, Oct 22, 2021 at 4:50 PM Emil Renner Berthing <kernel@xxxxxxxx> wrote:
> On Fri, 22 Oct 2021 at 15:39, Andy Shevchenko <andy.shevchenko@xxxxxxxxx> wrote:
> > On Fri, Oct 22, 2021 at 4:35 PM Emil Renner Berthing <kernel@xxxxxxxx> wrote:
> > > On Fri, 22 Oct 2021 at 14:56, Andy Shevchenko <andy.shevchenko@xxxxxxxxx> wrote:
> > > > On Thu, Oct 21, 2021 at 8:43 PM Emil Renner Berthing <kernel@xxxxxxxx> wrote:

...

> > > > Can you convert this to simple
> > > >
> > > >   if (assert)
> > > >     ret = readl_...
> > > >   else
> > > >     ret = readl_...
> > > >
> > > > below?
> > >
> > > I don't see how that would work. We're using the done value in in the
> > > readl_poll_timeout. Maybe you can be a bit more explicit.
> >
> > Supply done either == mask or == ^mask. Try it.
>
> So you want this?
> if (assert)
>   ret = readl_poll_timeout_atomic(reg_status, value, (value & mask) ==
> done, 0, 1000);
> else
>   ret = readl_poll_timeout_atomic(reg_status, value, (value & mask) ==
> ^done, 0, 1000);
>
> The compiler might be clever enough, but I'd worry the long body of
> the readl_poll_timeout_atomic macro is inline twice. Rather than just
> flipping the bit in `done`.

You have a point, although it would be nice to have confirmation of either.

-- 
With Best Regards,
Andy Shevchenko