linux-kernel - Re: [PATCH v2 0/3] Add CAMSS support for SM6350

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Message-ID: <0392b41d-3a95-4c77-9267-bfa3e207013a@oss.qualcomm.com>
Date: Tue, 18 Nov 2025 12:50:23 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Luca Weiss <luca.weiss@...rphone.com>,
        Bryan O'Donoghue <bod@...nel.org>, Robert Foss <rfoss@...nel.org>,
        Todor Tomov <todor.too@...il.com>,
        Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Taniya Das <taniya.das@....qualcomm.com>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] Add CAMSS support for SM6350

On 11/18/25 12:08 PM, Bryan O'Donoghue wrote:
> On 18/11/2025 10:06, Konrad Dybcio wrote:
>>>> Konrad
>>> vfe170 is what we have on sdm845
>>>
>>> So I'm just asking Luca to try the sdm845 method of waggling this clock since what we have doesn't work.
>> It's of course going to work because this way you're not calling the
>> code that throws this error
>>
>> I was curious whether you know the actual reason why this is being
>> done in some other GCC drivers
>>
>> Konrad
> 
> No notion at all, perhaps as a workaround to this very problem.

I tried digging it up, but only managed to find that there is a signal
between titan and gcc to request it being enabled (perhaps that's a
fancy description of hwcg)

Maybe +Taniya would know? (context: sm6350 gcc_camera_axi_clk stuck at
'on' when disabling)

Konrad