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

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Message-ID: <893b97ad-7d2b-4408-bab5-2cd63fdaa33b@oss.qualcomm.com>
Date: Mon, 17 Nov 2025 13:53:29 +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>
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 11/16/25 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