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Date: Wed, 22 Nov 2017 00:32:27 +0100 From: Lukasz Luba <llu.ker.dev@...il.com> To: Eduardo Valentin <edubezval@...il.com>, Daniel Lezcano <daniel.lezcano@...aro.org> CC: Javi Merino <javi.merino@...nel.org>, Vincent Guittot <vincent.guittot@...aro.org>, Ionela Voinescu <ionela.voinescu@....com>, Punit Agrawal <punit.agrawal@....com>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Viresh Kumar <viresh.kumar@...aro.org>, "Rafael J. Wysocki" <rafael@...nel.org>, Amit Daniel Kachhap <amit.kachhap@...il.com>, Zhang Rui <rui.zhang@...el.com>, Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...hat.com>, Linux PM <linux-pm@...r.kernel.org>, Lukasz Luba <lukasz.luba@....com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 4/4] cpu_cooling: Drop static-power related stuff On 21/11/17 19:13, Eduardo Valentin wrote: > On Tue, Nov 21, 2017 at 07:05:46PM +0100, Daniel Lezcano wrote: >> On 21/11/2017 19:00, Javi Merino wrote: >>> Hi, >>> >>> On Tue, Nov 21, 2017 at 08:57:06AM -0800, Eduardo Valentin wrote: >>> >>> [snip] >>> >>>> As I said before, the minimal you guys (ARM and Linaro) can do is to at >>>> least upstream the Juno code! as a reference. Come on guys? what is >>>> preventing you to upstream Juno model? >>> >>> As Ionela pointed out earlier in the thread, the cpufreq driver for Juno >>> was not acceptable for mainline because it used platform specific code. >>> When it was converted to cpufreq-dt, the static power was left behind >>> because it can't be represented in device tree. This is because there >>> isn't a function that works for every SoC, different process nodes >>> (among other things) will need different functions. So it can't be just >>> a bunch of coefficients in DT, we need a function. Hence the callback. >> >> The DT could contain the coef and a compatible string for a specific >> polynomial computation callback. I imagine we should not have a lot of >> different equations, no ? >> > > Yeah, that would be another way of doing it. If there is no equation > that correlates all processes, then we need a vendor specific entry, or > a compatible string, as Daniel said. > So we have ~8 weeks (before it will vanish from mainline) to come up with ideas or to show that it is needed and used by some platform. Let's see... Regards, Lukasz
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