Re: [PATCH v5 1/5] media: qcom: camss: Add V4L2 meta format for CAMSS ISP parameters

[Bryan O'Donoghue <bod@kernel.org>]

On 30/07/2026 12:44, Loic Poulain wrote:
> On Wed, Jul 29, 2026 at 8:28 PM Gjorgji Rosikopulos (Consultant)
> <gjorgji.rosikopulos@oss.qualcomm.com> wrote:
>>
>> Hi Loic,
>>
>> On 7/24/2026 3:42 PM, Loic Poulain wrote:
>>> Add a V4L2 meta format code (V4L2_META_FMT_QCOM_ISP_PARAMS) for the
>>> Qualcomm CAMSS ISP parameter buffer. This format is used by the params
>>> video node exposed by CAMSS offline ISP drivers (e.g. OPE) to carry
>>> ISP tuning data such as white balance, color correction and chroma
>>> enhancement settings.
>>>
>>> Signed-off-by: Loic Poulain <loic.poulain@oss.qualcomm.com>
>>> ---
>>>   drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
>>>   include/uapi/linux/videodev2.h       | 3 +++
>>>   2 files changed, 4 insertions(+)
>>>
>>> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
>>> index 98512ea4cc5b9d725e1851af2ed38df85bb4fa8c..7b6e9a9a514f037190d55d59409dd6cc97522943 100644
>>> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
>>> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
>>> @@ -1471,6 +1471,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>>>        case V4L2_META_FMT_C3ISP_STATS:         descr = "Amlogic C3 ISP Statistics"; break;
>>>        case V4L2_META_FMT_MALI_C55_PARAMS:     descr = "ARM Mali-C55 ISP Parameters"; break;
>>>        case V4L2_META_FMT_MALI_C55_STATS:      descr = "ARM Mali-C55 ISP 3A Statistics"; break;
>>> +     case V4L2_META_FMT_QCOM_ISP_PARAMS:     descr = "Qualcomm CAMSS ISP Parameters"; break;
>>>        case V4L2_PIX_FMT_NV12_8L128:   descr = "NV12 (8x128 Linear)"; break;
>>>        case V4L2_PIX_FMT_NV12M_8L128:  descr = "NV12M (8x128 Linear)"; break;
>>>        case V4L2_PIX_FMT_NV12_10BE_8L128:      descr = "10-bit NV12 (8x128 Linear, BE)"; break;
>>> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
>>> index add08188f06890182a5c399a223c1ab0a546cae1..011026194a20cde22a374e6fb2570cbc6bced230 100644
>>> --- a/include/uapi/linux/videodev2.h
>>> +++ b/include/uapi/linux/videodev2.h
>>> @@ -888,6 +888,9 @@ struct v4l2_pix_format {
>>>   #define V4L2_META_FMT_MALI_C55_PARAMS        v4l2_fourcc('C', '5', '5', 'P') /* ARM Mali-C55 Parameters */
>>>   #define V4L2_META_FMT_MALI_C55_STATS v4l2_fourcc('C', '5', '5', 'S') /* ARM Mali-C55 3A Statistics */
>>>
>>> +/* Vendor specific - used for Qualcomm CAMSS offline ISP */
>>
>> It seems that this is generic format for ISP parameters, can we update the comment and remove offline. The proposal:
>> /* Vendor specific - used for Qualcomm CAMSS ISP */
> 
> Sure.
> Loic

Since these are not the full list and as I understand them not the full 
structures for OPE - qcom restricting the full formats ? - I'd request 
to move these to an OPE specific header.

---
bod