Re: [PATCH] cpufreq: Add Kryo CPU scaling driver

Russell King - ARM Linux
2018-05-21T12:11:58Z

On Mon, May 21, 2018 at 02:05:41PM +0300, ilialin@codeaurora.org wrote:
> You are right.
> cpu_dev_silver != cpu_dev_gold, and I found this with my tests as well.
> Thank you.
>
> > -----Original Message-----
> > From: Russell King - ARM Linux <linux@armlinux.org.uk>
> > Sent: Monday, May 21, 2018 13:54
> > To: Ilia Lin <ilialin@codeaurora.org>
> > Cc: viresh.kumar@linaro.org; devicetree@vger.kernel.org; linux-
> > pm@vger.kernel.org; linux-arm-msm@vger.kernel.org; linux-
> > kernel@vger.kernel.org; linux-soc@vger.kernel.org; linux-
> > clk@vger.kernel.org; linux-arm-kernel@lists.infradead.org
> > Subject: Re: [PATCH] cpufreq: Add Kryo CPU scaling driver
> >
> > On Mon, May 21, 2018 at 01:31:30PM +0300, Ilia Lin wrote:
> > > +#define SILVER_LEAD 0
> > > +#define GOLD_LEAD 2
> >
> > Okay, two different values here, but "GOLD_LEAD" appears unused.
> >
> > > + cpu_dev_silver = get_cpu_device(SILVER_LEAD);
> > > + if (NULL == cpu_dev_silver)
> > > + return -ENODEV;
> > > +
> > > + cpu_dev_gold = get_cpu_device(SILVER_LEAD);
> > > + if (NULL == cpu_dev_gold)
> > > + return -ENODEV;
> >
> > get_cpu_device() takes the logical CPU number. So the above gets CPU 0
> > each time, and so cpu_dev_silver == cpu_dev_gold here. So what's the
> > point of the second get_cpu_device() ? If it's supposed to be:
> >
> > cpu_dev_gold = get_cpu_device(GOLD_LEAD);
> >
> > That would get CPU 2, but in terms of these defines, it doesn't make that
> > much sense. What exactly does "silver lead" and "gold lead" refer to in
> these
> > definitions?

I think you still need to explain this.

--
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