linux-kernel - Re: [PATCH v7 3/3] media: qcom: camss: tpg: Add TPG support for multiple targets

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Message-ID: <e93f95e7-59ec-405a-aa05-df78ad86be9b@oss.qualcomm.com>
Date: Tue, 13 Jan 2026 14:01:20 +0800
From: Wenmeng Liu <wenmeng.liu@....qualcomm.com>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Robert Foss <rfoss@...nel.org>, Todor Tomov <todor.too@...il.com>,
        Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v7 3/3] media: qcom: camss: tpg: Add TPG support for
 multiple targets



On 1/12/2026 11:43 PM, Bryan O'Donoghue wrote:
> On 26/12/2025 09:19, Wenmeng Liu wrote:
>> Add support for TPG found on LeMans, Monaco, Hamoa.
>>
>> Signed-off-by: Wenmeng Liu <wenmeng.liu@....qualcomm.com>
>> ---
>>   drivers/media/platform/qcom/camss/Makefile         |   1 +
>>   drivers/media/platform/qcom/camss/camss-csid-680.c |  16 ++
>>   .../media/platform/qcom/camss/camss-csid-gen3.c    |  16 ++
>>   drivers/media/platform/qcom/camss/camss-tpg-gen1.c | 257 +++++++++++ 
>> ++++++++++
>>   drivers/media/platform/qcom/camss/camss.c          | 128 ++++++++++
>>   5 files changed, 418 insertions(+)
> This is causing a regression on Hamoa.
> 
> Did you check the camera itself still streams ? For me, camera streaming 
> breaks when this patch is applied.
> 
> Please look into this.
> 
> ➞  git bisect good
>                  [git:60c1b50b1f2f5] ✖
> 9d1d90cca34ca66617ade951d42c94d5f086717f is the first bad commit
> commit 9d1d90cca34ca66617ade951d42c94d5f086717f
> Author: Wenmeng Liu <wenmeng.liu@....qualcomm.com>
> Date:   Fri Dec 26 17:19:12 2025 +0800
> 
>      media: qcom: camss: tpg: Add TPG support for multiple targets
> 
>      Add support for TPG found on LeMans, Monaco, Hamoa.
> 
>      Signed-off-by: Wenmeng Liu <wenmeng.liu@....qualcomm.com>
>      Signed-off-by: Bryan O'Donoghue <bod@...nel.org>
> 
>   drivers/media/platform/qcom/camss/Makefile          |   1 +
>   drivers/media/platform/qcom/camss/camss-csid-680.c  |  16 ++++++++
>   drivers/media/platform/qcom/camss/camss-csid-gen3.c |  16 ++++++++
>   drivers/media/platform/qcom/camss/camss-tpg-gen1.c  | 257 ++++++++++++ 
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 
> +++++++++++++++++++++++++++++++++++++++++
>   drivers/media/platform/qcom/camss/camss.c           | 128 ++++++++++++ 
> ++++++++++++++++++++++++++++++++++++++++++++++++++
>   5 files changed, 418 insertions(+)
>   create mode 100644 drivers/media/platform/qcom/camss/camss-tpg-gen1.c
> 
> ➞  git bisect log
>                  [git:60c1b50b1f2f5] ✖
> git bisect start
> # status: waiting for both good and bad commits
> # bad: [2ae8c3645005e9115f39e8aa61dea9ea48cc356e] media: qcom: camss: 
> add support for SM6150 camss
> 
> git bisect bad 2ae8c3645005e9115f39e8aa61dea9ea48cc356e
> # status: waiting for good commit(s), bad commit known
> # good: [f89c11002f67740aaed818137d513d6c3dbc348a] dt-bindings: media: 
> qcom,x1e80100-camss: Add missing regs, clocks, iommus
> 
> git bisect good f89c11002f67740aaed818137d513d6c3dbc348a
> # good: [18f74c5866cb470123eb0b39cf3248a09fab3ef9] media: qcom: camss: 
> Add common TPG support
> 
> git bisect good 18f74c5866cb470123eb0b39cf3248a09fab3ef9
> # bad: [9aaf62e09bb1bb17c186addc49984343623df50e] media: qcom: camss: 
> csid-340: Fix unused variables
> 
> git bisect bad 9aaf62e09bb1bb17c186addc49984343623df50e
> # bad: [9d1d90cca34ca66617ade951d42c94d5f086717f] media: qcom: camss: 
> tpg: Add TPG support for multiple targets
> 
> git bisect bad 9d1d90cca34ca66617ade951d42c94d5f086717f
> # good: [60c1b50b1f2f5466c07aeb4148df25227b5f6d55] media: qcom: camss: 
> Add link support for TPG
> 
> git bisect good 60c1b50b1f2f5466c07aeb4148df25227b5f6d55
> # first bad commit: [9d1d90cca34ca66617ade951d42c94d5f086717f] media: 
> qcom: camss: tpg: Add TPG support for multiple targets
> 
> ---
> bod

The actual result of CSI2_RX_CFG0_TPG_NUM_SEL | CSI2_RX_CFG0_TPG_NUM_EN 
is 28 | 27 = 31, which is just an integer rather than a mask.

Sorry for lack this error code fix. will fix it in next version.

Thanks,
Wenmeng