linux-kernel - Re: [PATCH v5 4/7] media: qcom: camss: Move VFE power-domain specifics into vfe.c

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Date:   Thu, 23 Nov 2023 13:53:31 +0000
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>, hverkuil-cisco@...all.nl,
        laurent.pinchart@...asonboard.com, Robert Foss <rfoss@...nel.org>,
        Todor Tomov <todor.too@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        matti.lehtimaki@...il.com, quic_grosikop@...cinc.com
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4/7] media: qcom: camss: Move VFE power-domain
 specifics into vfe.c

On 23/11/2023 12:04, Konrad Dybcio wrote:
>> -    if (camss->genpd_num > camss->res->vfe_num)
>> -        device_link_del(camss->genpd_link[camss->genpd_num - 1]);
>> +    if (camss->genpd_link)
>> +        device_link_del(camss->genpd_link);
>> +
>> +    dev_pm_domain_detach(camss->genpd, true);
>> -    for (i = 0; i < camss->genpd_num; i++)
>> -        dev_pm_domain_detach(camss->genpd[i], true);
>> +    camss_genpd_subdevice_cleanup(camss);
> This changes the behavior, previously CAMSS_TOP was shut down last

Nope it was first. As a testament to how confusing this code was this is 
TOP completely not obviously..

if (camss->genpd_num > camss->res->vfe_num)
     device_link_del(camss->genpd_link[camss->genpd_num - 1]);

so this is equivalent

if (camss->genpd_link)
     device_link_del(camss->genpd_link);

Since I'm V6ing to add the additional patch, I will change the logic 
here to make TOP unlink last though because, logic.

---
bod