linux-kernel - Re: [PATCH v3 10/12] i2c: qcom-geni: Use resources helper APIs in runtime PM functions

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Message-ID: <638daf43-d80c-493b-a88d-18bef447c02e@oss.qualcomm.com>
Date: Tue, 3 Feb 2026 12:13:06 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Praveen Talari <praveen.talari@....qualcomm.com>,
        Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Mukesh Kumar Savaliya <mukesh.savaliya@....qualcomm.com>,
        Viken Dadhaniya <viken.dadhaniya@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, bryan.odonoghue@...aro.org,
        dmitry.baryshkov@....qualcomm.com, bjorn.andersson@....qualcomm.com
Cc: prasad.sodagudi@....qualcomm.com, quic_vtanuku@...cinc.com,
        aniket.randive@....qualcomm.com, chandana.chiluveru@....qualcomm.com
Subject: Re: [PATCH v3 10/12] i2c: qcom-geni: Use resources helper APIs in
 runtime PM functions

On 1/30/26 5:48 PM, Praveen Talari wrote:
> Hi Konrad,
> 
> On 1/30/2026 5:35 PM, Konrad Dybcio wrote:
>> On 1/12/26 11:47 AM, Praveen Talari wrote:
>>> To manage GENI serial engine resources during runtime power management,
>>> drivers currently need to call functions for ICC, clock, and
>>> SE resource operations in both suspend and resume paths, resulting in
>>> code duplication across drivers.
>>>
>>> The new geni_se_resources_activate() and geni_se_resources_deactivate()
>>> helper APIs addresses this issue by providing a streamlined method to
>>> enable or disable all resources based, thereby eliminating redundancy
>>> across drivers.
>>>
>>> Signed-off-by: Praveen Talari <praveen.talari@....qualcomm.com>
>>> ---
>>> v1->v2:
>>> Bjorn:
>>> - Remove geni_se_resources_state() API.
>>> - Used geni_se_resources_activate() and geni_se_resources_deactivate()
>>>    to enable/disable resources.
>>> ---
>>>   drivers/i2c/busses/i2c-qcom-geni.c | 28 +++++-----------------------
>>>   1 file changed, 5 insertions(+), 23 deletions(-)
>>>
>>> diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
>>> index a4b13022e508..b0a18e3d57d9 100644
>>> --- a/drivers/i2c/busses/i2c-qcom-geni.c
>>> +++ b/drivers/i2c/busses/i2c-qcom-geni.c
>>> @@ -1160,18 +1160,15 @@ static int __maybe_unused geni_i2c_runtime_suspend(struct device *dev)
>>>       struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);
>>>         disable_irq(gi2c->irq);
>>> -    ret = geni_se_resources_off(&gi2c->se);
>>> +
>>> +    ret = geni_se_resources_deactivate(&gi2c->se);
>>
>> This calls dev_pm_opp_set_rate(se->dev, 0), dropping the performance state
> 
> This does not apply to I²C, since I²C lacks an OPP table, so the callback is only relevant for SPI and UART. All the refactored APIs were added as generic interfaces shared across I²C, SPI, and UART.

Does the i2c mode not require any ratesetting on the SE clock, or
any >= LOWSVS RPMh vote on the power rail?

Konrad