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 11:18:20 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bryan O'Donoghue <bryan.odonoghue@...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 10/25/23 00:42, Bryan O'Donoghue wrote:
> For the various versions of VFE we have a boiler-plate
> pm_domain_on/pm_domain_off callback pair of the general form.
> 
> - Error check.
>    Not always done but applicable to all.
> 
> - device_link_add (DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME |
>                     DL_FLAG_RPM_ACTIVE);
> 
> - Error check returning -EINVAL on error.
> 
> - Return 0
> 
> Reduce 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?

> 
> Otherwise lets chuck out a bunch of needlessly replicated code.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad