From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thara Gopinath <thara.gopinath@linaro.org>,
qualcomm-lt@lists.linaro.org, linux-pm@vger.kernel.org,
ulf.hansson@linaro.org, rnayak@codeaurora.org
Subject: Re: [PATCH 0/4] qcom: Model RPMH power domains as thermal cooling devices
Date: Fri, 23 Aug 2019 23:00:02 -0700 [thread overview]
Message-ID: <20190824060002.GS26807@tuxbook-pro> (raw)
In-Reply-To: <efe98b11-9b79-4ecb-5e28-2a62235cf56c@linaro.org>
On Wed 14 Aug 03:52 PDT 2019, Daniel Lezcano wrote:
>
> Hi Thara,
>
> interesting series. Can you describe what use case this series will solve?
>
The purpose is to ensure a minimum voltage (voltage corner) on the
memory rail (mx) at low temperature, to meet some physical requirement.
> On 10/08/2019 02:58, Thara Gopinath wrote:
> > Certain RPMH power domains can be used to warm up the SoC (mx on sdm845)
> > if the temperature falls below certain threshold.
>
> What is the relationship between the temperature fall, the sensor(s)
> location and the warming device(s) in this case?
>
Presumably any on-die sensor could be used and the minimum voltage
requirement only applies below some configurable threshold.
>
> > These power domains
> > can be considered as thermal warming devices
> > (opposite of thermal cooling devices).
>
> Is it possible to elaborate how works the RPMH as a warming device and
> what is the "mx on sdm845"?
>
RPMh is the interface used to configure the voltage corner (and other
shared resources, such as regulators, interconnects etc). mx is the
"memory rail" power domain.
Regards,
Bjorn
prev parent reply other threads:[~2019-08-24 5:58 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-10 0:58 [PATCH 0/4] qcom: Model RPMH power domains as thermal cooling devices Thara Gopinath
2019-08-10 0:58 ` [PATCH 1/4] PM/Domains: Add support for retrieving genpd performance states information Thara Gopinath
2019-08-11 3:25 ` kbuild test robot
2019-08-11 4:03 ` kbuild test robot
2019-08-22 15:03 ` Ulf Hansson
2019-08-23 17:39 ` Thara Gopinath
2019-09-06 22:24 ` Thara Gopinath
2019-09-09 9:40 ` Ulf Hansson
2019-08-10 0:58 ` [PATCH 2/4] soc: qcom: rpmhpd: Introduce function to retrieve power domain performance state count Thara Gopinath
2019-08-10 0:58 ` [PATCH 3/4] thermal: qcom: Add RPMHPD cooling device driver Thara Gopinath
2019-08-22 15:19 ` Ulf Hansson
2019-08-23 17:51 ` Thara Gopinath
2019-08-24 6:10 ` Bjorn Andersson
2019-08-27 10:42 ` Thara Gopinath
2019-08-28 19:22 ` Bjorn Andersson
2019-08-28 12:23 ` Zhang Rui
2019-09-06 15:05 ` Thara Gopinath
2019-08-10 0:58 ` [PATCH 4/4] arm64: dts: qcom: Extend AOSS RPMHPD node Thara Gopinath
2019-08-14 10:52 ` [PATCH 0/4] qcom: Model RPMH power domains as thermal cooling devices Daniel Lezcano
2019-08-15 13:09 ` Thara Gopinath
2019-08-24 6:00 ` Bjorn Andersson [this message]
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