From: Viresh Kumar <viresh.kumar@linaro.org>
To: Bjorn Andersson <andersson@kernel.org>
Cc: Manivannan Sadhasivam <mani@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Andy Gross <agross@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Johan Hovold <johan@kernel.org>,
devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org
Subject: Re: [RFC PATCH 0/4] cpufreq: qcom-hw: Move clocks to CPU node
Date: Tue, 30 Aug 2022 11:10:42 +0530 [thread overview]
Message-ID: <20220830054042.akj7pf366inelvpo@vireshk-i7> (raw)
In-Reply-To: <20220830032456.z4olnogsyg32vhiz@builder.lan>
On 29-08-22, 22:24, Bjorn Andersson wrote:
> Conceptually, it sounds like a good idea to express the clock feeding
> the CPU clusters, which is controlled by the OSM/EPSS. But do you
> expect the OPP framework to actually do something with the clock, or
> just to ensure that the relationship is properly described?
No, the OPP core will never try to set the clock rate in your case,
though it will do clk_get().
> FWIW, the possible discrepancy between the requested frequency and the
> actual frequency comes from the fact that OSM/EPSS throttles the cluster
> frequency based on a number of different factors (thermal, voltages
> ...).
> This is reported back to the kernel using the thermal pressure
> interface. It would be quite interesting to see some investigation in
> how efficient the kernel is at making use of this feedback.
--
viresh
next prev parent reply other threads:[~2022-08-30 5:40 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-13 6:52 [RFC PATCH 0/4] cpufreq: qcom-hw: Move clocks to CPU node Viresh Kumar
2022-07-13 6:52 ` [RFC PATCH 1/4] dt-bindings: cpufreq-qcom-hw: Move clocks to CPU nodes Viresh Kumar
2022-07-18 20:46 ` Rob Herring
2022-07-19 4:19 ` Viresh Kumar
2022-07-13 6:52 ` [RFC PATCH 2/4] arm64: dts: qcom: " Viresh Kumar
2022-07-13 6:52 ` [RFC PATCH 3/4] cpufreq: qcom-cpufreq-hw: Clocks are moved " Viresh Kumar
2022-07-13 6:52 ` [RFC PATCH 4/4] cpufreq: qcom-cpufreq-hw: Register config_clks helper Viresh Kumar
2022-07-15 16:09 ` [RFC PATCH 0/4] cpufreq: qcom-hw: Move clocks to CPU node Manivannan Sadhasivam
2022-07-18 1:57 ` Viresh Kumar
2022-08-01 2:37 ` Viresh Kumar
2022-08-01 5:42 ` Manivannan Sadhasivam
2022-08-30 3:24 ` Bjorn Andersson
2022-08-30 5:40 ` Viresh Kumar [this message]
2022-08-30 6:20 ` Manivannan Sadhasivam
2022-09-20 10:28 ` Viresh Kumar
2022-09-26 11:34 ` Manivannan Sadhasivam
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