linux-kernel - Re: [RFC-next 0/1] Odroid C2: Enable DVFS for cpu

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Message-ID: <7hpngvontu.fsf@baylibre.com>
Date:   Tue, 10 Dec 2019 13:47:09 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Anand Moon <linux.amoon@...il.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-amlogic@...ts.infradead.org,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC-next 0/1] Odroid C2: Enable DVFS for cpu

Martin Blumenstingl <martin.blumenstingl@...glemail.com> writes:

> On Tue, Dec 10, 2019 at 7:13 PM Kevin Hilman <khilman@...libre.com> wrote:
>>
>> Anand Moon <linux.amoon@...il.com> writes:
>>
>> > Hi Neil / Kevin,
>> >
>> > On Tue, 10 Dec 2019 at 14:13, Neil Armstrong <narmstrong@...libre.com> wrote:
>> >>
>> >> On 09/12/2019 23:12, Kevin Hilman wrote:
>> >> > Anand Moon <linux.amoon@...il.com> writes:
>> >> >
>> >> >> Some how this patch got lost, so resend this again.
>> >> >>
>> >> >> [0] https://patchwork.kernel.org/patch/11136545/
>> >> >>
>> >> >> This patch enable DVFS on GXBB Odroid C2.
>> >> >>
>> >> >> DVFS has been tested by running the arm64 cpuburn
>> >> >> [1] https://github.com/ssvb/cpuburn-arm/blob/master/cpuburn-a53.S
>> >> >> PM-QA testing
>> >> >> [2] https://git.linaro.org/power/pm-qa.git [cpufreq testcase]
>> >> >>
>> >> >> Tested on latest U-Boot 2019.07-1 (Aug 01 2019 - 23:58:01 +0000) Arch Linux ARM
>> >> >
>> >> > Have you tested with the Harkernel u-boot?
>> >> >
>> >> > Last I remember, enabling CPUfreq will cause system hangs with the
>> >> > Hardkernel u-boot because of improperly enabled frequencies, so I'm not
>> >> > terribly inclined to merge this patch.
>> >
>> > HK u-boot have many issue with loading the kernel, with load address
>> > *it's really hard to build the kernel for HK u-boot*,
>> > to get the configuration correctly.
>> >
>> > Well I have tested with mainline u-boot with latest ATF .
>> > I would prefer mainline u-boot for all the Amlogic SBC, since
>> > they sync with latest driver changes.
>>
>> Yes, we would all prefer mainline u-boot, but the mainline kernel needs
>> to support the vendor u-boot that is shipping with the boards.  So
>> until Hardkernel (and other vendors) switch to mainline u-boot we do not
>> want to have upstream kernel defaults that will not boot with the vendor
>> u-boot.
>>
>> We can always support these features, but they just cannot be enabled
>> by default.
> (I don't have an Odroid-C2 but I'm curious)
> should Anand submit a patch to mainline u-boot instead?

It would be in addition to $SUBJECT patch, not instead, I think.

> the &scpi_clocks node could be enabled at runtime by mainline u-boot

That would work, but I don't know about u-boot maintainers opinions on
this kind of thing, so let's see what Neil thinks.

Kevin