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

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Message-ID: <28f33d3a-6866-4bdb-a1e5-d193dcb7d4d1@linaro.org>
Date: Tue, 18 Nov 2025 09:33:35 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 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>
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 17/11/2025 12:53, Konrad Dybcio wrote:
> On 11/16/25 3:30 PM, Bryan O'Donoghue wrote:
>> On 14/11/2025 15:59, Luca Weiss wrote:
>>> On Fri Nov 14, 2025 at 4:51 PM CET, Bryan O'Donoghue wrote:
>>>> On 14/11/2025 11:15, Luca Weiss wrote:
>>>>> Add bindings, driver and dts to support the Camera Subsystem on the
>>>>> SM6350 SoC.
>>>>>
>>>>> These patches were tested on a Fairphone 4 smartphone with WIP sensor
>>>>> drivers (Sony IMX576 and IMX582), the camera pipeline works properly as
>>>>> far as I can tell.
>>>>>
>>>>> Though when stopping the camera stream, the following clock warning
>>>>> appears in dmesg. But it does not interfere with any functionality,
>>>>> starting and stopping the stream works and debugcc is showing 426.4 MHz
>>>>> while the clock is on, and 'off' while it's off.
>>>>>
>>>>> Any suggestion how to fix this, is appreciated.
>>>>>
>>>>> [ 5738.590980] ------------[ cut here ]------------
>>>>> [ 5738.591009] gcc_camera_axi_clk status stuck at 'on'
>>>>> [ 5738.591049] WARNING: CPU: 0 PID: 6918 at drivers/clk/qcom/clk-branch.c:87 clk_branch_toggle+0x170/0x190
>>>>
>>>> Do you have a full and complete kernel tree we could look at here ?
>>>
>>> Sure, this branch has everything in:
>>>
>>> https://github.com/sm6350-mainline/linux/tree/sm6350-6.17.y/
>>>
>>> For further refence, at least two other people have tested this branch
>>> in postmarketOS, nothing particularly exciting to report from there,
>>> apart from that the sdm-skin-thermal thermal zone (thermistor right next
>>> to SoC) is currently configured with 55 degC as critical trip, which is
>>> quickly achieved when starting a video recording, but that's not really
>>> an issue with camss, but will need some tweaking regardless.
>>>
>>> https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7281
>>
>> diff --git a/drivers/clk/qcom/gcc-sm6350.c b/drivers/clk/qcom/gcc-sm6350.c
>> index a4d6dff9d0f7f..229629ef82809 100644
>> --- a/drivers/clk/qcom/gcc-sm6350.c
>> +++ b/drivers/clk/qcom/gcc-sm6350.c
>> @@ -908,9 +908,7 @@ static struct clk_branch gcc_camera_ahb_clk = {
>>
>>   static struct clk_branch gcc_camera_axi_clk = {
>>          .halt_reg = 0x17018,
>> -       .halt_check = BRANCH_HALT,
>> -       .hwcg_reg = 0x17018,
>> -       .hwcg_bit = 1,
> 
> No reason to drop the hwcg description
> 
>> +       .halt_check = BRANCH_VOTED,
> 
> It'd be useful to explain why we should ignore the hw feedback in this case
> 
>>          .clkr = {
>>                  .enable_reg = 0x17018,
>>                  .enable_mask = BIT(0),
> 
> 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.

---
bod