linux-kernel - Re: [PATCH 2/4] media: qcom: camss: Use common VFE pm_domain_on/pm_domain

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Date:   Wed, 25 Oct 2023 11:40:04 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>, hverkuil-cisco@...all.nl,
        laurent.pinchart@...asonboard.com, rfoss@...nel.org,
        todor.too@...il.com, agross@...nel.org, andersson@...nel.org,
        mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] media: qcom: camss: Use common VFE
 pm_domain_on/pm_domain_off where applicable

On 25/10/2023 10:18, Konrad Dybcio wrote:
>> educe the pattern down to a common callback. VFE 4.1 is a special case
>> which to me also indicates that it is worthwhile maintaining an 
>> indirection
>> for the vfe_pm_domain_{on|off} for now.
> Are there issues when powering it off like all the others?

4.1 doesn't have a VFE power-domain just a top level controller PD, 
however I think a blank callback is neater than

if (vfe->pm_domain_on) {
     vfe->pd_domain_on();
}

its just vfe->pm_domain_on(); at the cost of 1 or 2 instructions for 
indirection.

---
bod