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Fri, 17 Jul 2026 07:20:23 -0700 (PDT) Received: from QCOM-eG0v1AUPpu.na.qualcomm.com ([2a01:e0a:830:450:751c:d61c:c91:60dd]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c1740bf91bdsm79085966b.63.2026.07.17.07.20.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Jul 2026 07:20:22 -0700 (PDT) From: Loic Poulain Subject: [PATCH 0/4] media: qcom: camss: Report CAMSS hardware version via media controller Date: Fri, 17 Jul 2026 16:20:19 +0200 Message-Id: <20260717-camss-version-v1-0-7ed71fea95e8@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIACM6WmoC/x2MywqAIBAAfyX2nKBCGv1KdFh0rT30wIUIxH/PO g7MTAGhzCQwdQUy3Sx8Hg1M30HY8FhJcWwMVlunvfEq4C6ibsqfqXAkdCYmpCFCa65MiZ//Ny+ 1vlag7MhfAAAA X-Change-ID: 20260717-camss-version-a8ea61dfae5d To: Bryan O'Donoghue , Vladimir Zapolskiy , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Loic Poulain X-Mailer: b4 0.14.2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE3MDE0NiBTYWx0ZWRfX/+HVnXobJNJq IcySJxoQT2ntfdYq/wjzIWDQNA8NUWn/jX+ihzxhJ3fEC9Oe6el8EEKRqAb5C1vKyjfMWZZ2Et6 MtVtezW4E3EmMgFzuXVQTGCxaNXrDFPFOobYMoo+cgesnW/ax2U5JLTfcsEHEH6HPyFGL4Iogm4 GBYw3pgx61LYkxvjCNHgsz63+SUjcRcJFd7AQ7oyubo3jUj7qzj0CIxne908eCP1AX5ffglb1nX VRChEtCwfkeByu9caHWiggh4s3zEzYODEQ2gpQ/Pbfk2hkWEnBC76nBdNDpKHQCDJdfscGm5oLc lvz5TLVI8r94YHW6LLXsQAcbejDQdexYABgS20z68GK9KuMqU8KBWqNeS/0QbpI3zQ1q1B1xwcR 64jNR7Io+PaIK1daGQnNAbmsS8Xp2lV2cPXZobogzXJQqo7Jk48yHaFloCoKqZiF24c1aaNj2EU ryzF3uiGqWcAlkZgDXA== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE3MDE0NiBTYWx0ZWRfX9LPbd1t45jFc sK1TuHMhYysWSMkuhFqi6RWr2DJDRO6ncXHr6Wh+bCra0ZoCHeL7Zv2h6DBpaR3EJg9BbeSiY/d 70VD10+repJYVk5jmJNHRixfbWQ2ZD8= X-Authority-Analysis: v=2.4 cv=YeWNIQRf c=1 sm=1 tr=0 ts=6a5a3a29 cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=1vSG1W2a-9V1GRHXi4UA:9 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 X-Proofpoint-GUID: hBklbSGbhEeD8SEUfvNfb704sMrOV8D7 X-Proofpoint-ORIG-GUID: hBklbSGbhEeD8SEUfvNfb704sMrOV8D7 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-17_04,2026-07-17_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 suspectscore=0 priorityscore=1501 clxscore=1015 spamscore=0 lowpriorityscore=0 adultscore=0 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607170146 This series lets user space discover the exact CAMSS hardware variant by reporting the top-level CAMSS hardware version register through the media controller (media_dev.hw_revision), queryable via media-ctl -p or MEDIA_IOC_DEVICE_INFO. This helps identify the platform variant and adapt behaviour accordingly, for example allowing libcamera to apply quirks or enable features that cannot be discovered through standard V4L2 or media-controller APIs. The version register is exposed by some platforms through the top-level "top" (or "cpas-top") reg region at offset 0. Accessing it requires the AHB bus to be clocked. To make this possible at probe time, the series first moves the shared CAMSS clocks (top_ahb, ahb, axi on QCM2290) into the PM clock framework, so they are managed by runtime PM at the CAMSS instance level rather than by each individual sub-block (VFE, CSID, ...). For now, only Agatti is supported. But support for other platforms like TITAN-based ones will be introduced in a follow-up series. Reported media info on Agatti/CM2290 (Spectra 520): Media Driver Info: Driver name : qcom-camss Model : Qualcomm Camera Subsystem Bus info : platform:5c11000.camss Hardware revision: 0x00050200 (328192) Signed-off-by: Loic Poulain --- Loic Poulain (4): media: qcom: camss: Add PM clock support and integrate with runtime PM media: qcom: camss: Add PM clock definitions for QCM2290 media: qcom: camss: Drop top_ahb/ahb/axi from QCM2290 subdevice clocks media: qcom: camss: Report hardware version via media controller drivers/media/platform/qcom/camss/camss.c | 113 +++++++++++++++++++++++------- drivers/media/platform/qcom/camss/camss.h | 2 + 2 files changed, 88 insertions(+), 27 deletions(-) --- base-commit: fce2dfa773ced15f27dd27cd0b482a7473cdcf2a change-id: 20260717-camss-version-a8ea61dfae5d Best regards, -- Loic Poulain