linux-kernel - Re: [PATCH v3 07/15] media: qcom: camss: Capture VFE CSID dependency in a helper function

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Date:   Sat, 26 Aug 2023 13:16:39 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>, rfoss@...nel.org,
        todor.too@...il.com, agross@...nel.org, andersson@...nel.org,
        mchehab@...nel.org, hverkuil-cisco@...all.nl,
        laurent.pinchart@...asonboard.com, sakari.ailus@...ux.intel.com,
        andrey.konovalov@...aro.org
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 07/15] media: qcom: camss: Capture VFE CSID dependency
 in a helper function

On 26/08/2023 13:13, Konrad Dybcio wrote:
> On 26.08.2023 14:12, Bryan O'Donoghue wrote:
>> On 26/08/2023 13:04, Konrad Dybcio wrote:
>>>>>>    From sdm845 onwards we need to ensure the VFE is powered on prior to
>>>>>> switching on the CSID.
>>>>> And what's the symptom if we fail to ensure this? How can someone
>>>>> adding support for another platform tell whether the match-list
>>>>> should be expanded?
>>>> That person has to understand the dependency.
>>> If we need this workaround, there surely must be something that doesn't
>>> work without it, a measurable symptom. What is it?
>>
>> The CSID lives inside of the VFE therefore the VFE must be power prior to the CSID.
>>
>> The symptom will be .. the CSID doesn't come out of reset.
> Good, that's what I needed to know.
> 
> Now we can rename that function to something like camss_csid_inside_vfe()
> to make it more meaningful

If you feel there is a meaningful distinction between 
"csid_depends_vfe()" and "camss_csid_inside_vfe()"

I'm happy to humour you.

---
bod