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docs: thermal: convert cpu-idle-cooling.rst to ReST
Despite being named with .rst extension, this file doesn't match the ReST standard. It actually causes a crash at Sphinx: Sphinx parallel build error: docutils.utils.SystemMessage: /devel/v4l/docs/Documentation/driver-api/thermal/cpu-idle-cooling.rst:69: (SEVERE/4) Unexpected section title. Add needed markups for it to be properly parsed. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Link: https://lore.kernel.org/r/7640755514809a7b5fe2756f3702613865877dcb.1592203650.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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@ -1,3 +1,5 @@
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.. SPDX-License-Identifier: GPL-2.0
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================
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CPU Idle Cooling
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================
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@ -48,7 +50,7 @@ idle state target residency, we lead to dropping the static and the
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dynamic leakage for this period (modulo the energy needed to enter
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this state). So the sustainable power with idle cycles has a linear
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relation with the OPP’s sustainable power and can be computed with a
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coefficient similar to:
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coefficient similar to::
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Power(IdleCycle) = Coef x Power(OPP)
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@ -139,7 +141,7 @@ Power considerations
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--------------------
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When we reach the thermal trip point, we have to sustain a specified
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power for a specific temperature but at this time we consume:
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power for a specific temperature but at this time we consume::
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Power = Capacitance x Voltage^2 x Frequency x Utilisation
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@ -148,7 +150,7 @@ wrong in the system setup). The ‘Capacitance’ and ‘Utilisation’ are a
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fixed value, ‘Voltage’ and the ‘Frequency’ are fixed artificially
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because we don’t want to change the OPP. We can group the
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‘Capacitance’ and the ‘Utilisation’ into a single term which is the
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‘Dynamic Power Coefficient (Cdyn)’ Simplifying the above, we have:
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‘Dynamic Power Coefficient (Cdyn)’ Simplifying the above, we have::
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Pdyn = Cdyn x Voltage^2 x Frequency
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@ -157,7 +159,7 @@ in order to target the sustainable power defined in the device
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tree. So with the idle injection mechanism, we want an average power
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(Ptarget) resulting in an amount of time running at full power on a
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specific OPP and idle another amount of time. That could be put in a
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equation:
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equation::
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P(opp)target = ((Trunning x (P(opp)running) + (Tidle x P(opp)idle)) /
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(Trunning + Tidle)
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@ -168,7 +170,7 @@ equation:
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At this point if we know the running period for the CPU, that gives us
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the idle injection we need. Alternatively if we have the idle
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injection duration, we can compute the running duration with:
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injection duration, we can compute the running duration with::
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Trunning = Tidle / ((P(opp)running / P(opp)target) - 1)
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@ -191,7 +193,7 @@ However, in this demonstration we ignore three aspects:
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target residency, otherwise we end up consuming more energy and
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potentially invert the mitigation effect
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So the final equation is:
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So the final equation is::
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Trunning = (Tidle - Twakeup ) x
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(((P(opp)dyn + P(opp)static ) - P(opp)target) / P(opp)target )
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