linux-kernel - Re: [PATCH v2 0/8] clk: qcom: Add support to attach multiple power domains in cc probe

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Message-ID: <caa00d62-b24d-4db7-9e12-170a10c073e3@linaro.org>
Date: Tue, 11 Mar 2025 19:55:07 +0200
From: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Jagadeesh Kona <quic_jkona@...cinc.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>
Cc: Ajit Pandey <quic_ajipan@...cinc.com>,
 Imran Shaik <quic_imrashai@...cinc.com>, Taniya Das <quic_tdas@...cinc.com>,
 Satya Priya Kakitapalli <quic_skakitap@...cinc.com>,
 linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v2 0/8] clk: qcom: Add support to attach multiple power
 domains in cc probe

On 3/11/25 14:10, Bryan O'Donoghue wrote:
> On 11/03/2025 10:12, Vladimir Zapolskiy wrote:
>> On 3/11/25 11:52, Bryan O'Donoghue wrote:
>>> On 06/03/2025 08:55, Jagadeesh Kona wrote:
>>>> In some of the recent chipsets, PLLs require more than one power domain
>>>> to be kept ON to configure the PLL. But the current code doesn't enable
>>>> all the required power domains while configuring the PLLs, this leads
>>>> to functional issues due to suboptimal settings of PLLs.
>>>>
>>>> To address this, add support for handling runtime power management,
>>>> configuring plls and enabling critical clocks from qcom_cc_really_probe.
>>>> The clock controller can specify PLLs, critical clocks, and runtime PM
>>>> requirements in the descriptor data. The code in qcom_cc_really_probe()
>>>> ensures all necessary power domains are enabled before configuring PLLs
>>>> or critical clocks.
>>>>
>>>> This series updates SM8450 & SM8550 videocc drivers to handle rpm,
>>>> configure PLLs and enable critical clocks from within
>>>> qcom_cc_really_probe()
>>>> using above support, so video PLLs are configured properly.
>>>>
>>>> This series fixes the below warning reported in SM8550 venus testing due
>>>> to video_cc_pll0 not properly getting configured during videocc probe
>>>>
>>>> [   46.535132] Lucid PLL latch failed. Output may be unstable!
>>>>
>>>> The patch adding support to configure the PLLs from common code is
>>>> picked from below series and updated it.
>>>> https://lore.kernel.org/all/20250113-support-pll-reconfigure-
>>>> v1-0-1fae6bc1062d@...cinc.com/
>>>>
>>>> Signed-off-by: Jagadeesh Kona <quic_jkona@...cinc.com>
>>>> ---
>>>> Changes in v2:
>>>>     - Added support to handle rpm, PLL configuration and enable critical
>>>>       clocks from qcom_cc_really_probe() in common code as per v1
>>>> commments
>>>>       from Bryan, Konrad and Dmitry
>>>>     - Added patches to configure PLLs from common code
>>>>     - Updated the SM8450, SM8550 videocc patches to use the newly
>>>>       added support to handle rpm, configure PLLs from common code
>>>>     - Split the DT change for each target separately as per
>>>>       Dmitry comments
>>>>     - Added R-By and A-By tags received on v1
>>>> - Link to v1: https://lore.kernel.org/r/20250218-videocc-pll-multi-
>>>> pd-voting-v1-0-cfe6289ea29b@...cinc.com
>>>>
>>>> ---
>>>> Jagadeesh Kona (7):
>>>>          dt-bindings: clock: qcom,sm8450-videocc: Add MXC power domain
>>>>          clk: qcom: common: Manage rpm, configure PLLs & AON clks in
>>>> really probe
>>>>          clk: qcom: videocc-sm8450: Move PLL & clk configuration to
>>>> really probe
>>>>          clk: qcom: videocc-sm8550: Move PLL & clk configuration to
>>>> really probe
>>>>          arm64: dts: qcom: Add MXC power domain to videocc node on SM8450
>>>>          arm64: dts: qcom: Add MXC power domain to videocc node on SM8550
>>>>          arm64: dts: qcom: Add MXC power domain to videocc node on SM8650
>>>>
>>> This list looks sparse.
>>>
>>> - camcc is missing
>>> - x1e is missing
>>> - sm8650 and sm8750 and both also missing
>>>
>>
>> Since there are concerns about DT bindings ABI change of CAMCC given by
>> Krzysztof, likely CAMCC changes shall not be inserted into this series.
>>
>> -- 
>> Best wishes,
>> Vladimir
> 
> drivers/clk/qcom/camcc-sm8650.c
> drivers/clk/qcom/camcc-x1e80100.c
> 
> In fact we appear to be amending the dts but not the driver for the 8650
> here.

I kindly ask to elaborate here.

This series does not touch CAMCC at all, and if the series touches CAMCC,
then it changes DT ABI, which is objected. Or is it for some reason
objected only for SM8550 and not for the other platforms? More information
is needed.

--
Best wishes,
Vladimir