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Thu, 29 Oct 2020 00:53:58 -0700 (PDT) Date: Thu, 29 Oct 2020 13:23:56 +0530 From: Viresh Kumar To: Lukasz Luba , vincent.guittot@linaro.org Subject: Re: [PATCH 0/4] Add sustainable OPP concept Message-ID: <20201029075356.rruej6jlerhfa4oy@vireshk-i7> References: <20201028140847.1018-1-lukasz.luba@arm.com> <20201029074057.6ugmwyzna52x3oli@vireshk-i7> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20201029074057.6ugmwyzna52x3oli@vireshk-i7> User-Agent: NeoMutt/20180716-391-311a52 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201029_035401_286510_1EC30A54 X-CRM114-Status: GOOD ( 20.97 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: nm@ti.com, devicetree@vger.kernel.org, daniel.lezcano@linaro.org, linux-pm@vger.kernel.org, sboyd@kernel.org, vireshk@kernel.org, rafael@kernel.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, sudeep.holla@arm.com, Dietmar.Eggemann@arm.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 29-10-20, 13:10, Viresh Kumar wrote: > On 28-10-20, 14:08, Lukasz Luba wrote: > > Hi all, > > > > This patch set introduces a concept of sustainable OPP, which then can be used > > by kernel frameworks or governors for estimating system sustainable system > > state. This kind of estimation is done e.g. in thermal governor Intelligent > > Power Allocation (IPA), which calculates sustainable power of the whole system > > and then derives some coefficients for internal algorithm. > > > > The patch set introduces a new DT bindings 'opp-sustainable', with parsing > > code. It also adds a function (in patch 3/4) which allows device drivers to set > > directly the sustainable OPP. This is helpful when the device drivers populate > > the OPP table by themself (example in patch 4/4). > > > > Can we please have some more information about this ? What does the > sustainable OPP mean ? How will platform guys know or learn about this > ? How we are going to use it finally ? What does it have to do with > temperature of the SoC or the thermal affects, etc. And that we need a real user of this first if it is ever going to be merged. -- viresh _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel