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Date: Mon, 15 Jan 2024 10:29:07 +0100
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Subject: Re: [PATCH v6 00/12] Unregister critical branch clocks + some RPM
To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Bjorn Andersson <andersson@kernel.org>, Andy Gross <agross@kernel.org>,
 Michael Turquette <mturquette@baylibre.com>, Stephen Boyd
 <sboyd@kernel.org>, Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>,
 Marijn Suijten <marijn.suijten@somainline.org>,
 linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org,
 linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
 Johan Hovold <johan+linaro@kernel.org>,
 Bryan O'Donoghue <bryan.odonoghue@linaro.org>
References: <20230717-topic-branch_aon_cleanup-v6-0-46d136a4e8d0@linaro.org>
 <CAA8EJppjxT=qri+bhfa=DbX09aCiFVp0vO3P0OD=TNiYJAd1-g@mail.gmail.com>
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From: Konrad Dybcio <konrad.dybcio@linaro.org>
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On 14.01.2024 05:53, Dmitry Baryshkov wrote:
> On Sat, 13 Jan 2024 at 16:51, Konrad Dybcio <konrad.dybcio@linaro.org> wrote:
>>
>> On Qualcomm SoCs, certain branch clocks either need to be always-on, or
>> should be if you're interested in touching some part of the hardware.
>>
>> Using CLK_IS_CRITICAL for this purpose sounds like a genius idea,
>> however that messes with the runtime pm handling - if a clock is
>> marked as such, the clock controller device will never enter the
>> "suspended" state, leaving the associated resources online, which in
>> turn breaks SoC-wide suspend.
>>
>> This series aims to solve that on a couple SoCs that I could test the
>> changes on and it sprinkles some runtime pm enablement atop these drivers.
> 
> Probably it is out of scope for this
> I wonder if it makes sense to route (some) of the clocks properly.
> Should we use GCC_foo_SLEEEP_CLK as a sleep clock for the
> corresponding device?
> I'm not sure about the AHB and XO clocks.
> 
> Another question is regarding the suspended state. Wouldn't leaving
> GCC_foo_XO clocks enabled keep the XO enabled as well?

Doesn't seem to be the case

Konrad