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Sun, 31 May 2026 23:42:58 -0700 (PDT) X-Received: by 2002:a17:90b:5704:b0:36a:f612:e6a3 with SMTP id 98e67ed59e1d1-36c501b8fb2mr9707531a91.17.1780296177992; Sun, 31 May 2026 23:42:57 -0700 (PDT) Received: from [10.206.103.106] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-36bc65e7afasm11934608a91.1.2026.05.31.23.42.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 31 May 2026 23:42:57 -0700 (PDT) Message-ID: Date: Mon, 1 Jun 2026 12:12:49 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Nihal Kumar Gupta Subject: Re: [PATCH 4/8] arm64: dts: qcom: shikra: Add CAMSS node To: Bryan O'Donoghue , Vikram Sharma , bod@kernel.org Cc: Vladimir Zapolskiy , Loic Poulain , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Robert Foss , Andi Shyti , Bjorn Andersson , Konrad Dybcio , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , linux-arm-msm@vger.kernel.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Suresh Vankadara References: <20260526-shikra-camss-review-v1-0-645d2c8c75a7@qti.qualcomm.com> <20260526-shikra-camss-review-v1-4-645d2c8c75a7@qti.qualcomm.com> <178000689150.4557.11759359941436928903.b4-reply@b4> <23d2a824-e894-4c26-8bd1-02bbb8a7c6d1@linaro.org> Content-Language: en-US In-Reply-To: <23d2a824-e894-4c26-8bd1-02bbb8a7c6d1@linaro.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=POg/P/qC c=1 sm=1 tr=0 ts=6a1d29f3 cx=c_pps a=vVfyC5vLCtgYJKYeQD43oA==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=5UiWIToyZdRRPDun-cEA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=rl5im9kqc5Lf4LNbBjHf:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjAxMDA2NSBTYWx0ZWRfX2SJxza/vheWe 2TrjMJnHMHbfonlQwi2N/aS45xIeIxX2kQUoH3Q4UA8sn2DCtYSatcNWph1+3zJ4w9PJk5WzAUs RP0vC6ZGYcgCf3N47QpS4cKYdnavMmEM3qLqbw0sdSlnvxvYNSvdAfxX6+nQPJciWtJxqBQlYon DYkd9yi1koFUmIkJbVGf2UYeQDPXI5MlVVM004n35GpFybfXM8b/Cd9rV0GMHVOflEC89/et7mC J0RjS/X1uiV3MwVQQ6hH4MAdnty/QxgVgL37v7ZspBKfqeVT1oYcgowPVJfvEd3ur1ux72QT1d7 mA6n5psnZLBMn/d+4zbA7C2+Cyf/rgLFvQzrev1b+kCmw7nC1yDIZvKWLdzPhyguSXwAU3th/YL ZLeEtfl3nB5zsoQYH6+7kCCXuuJ6E/YZ/+vmVwUwn7DWzy6gpJwDZFwYS8CMUYnedRAu9S9GlYp DAwGiM8SgXvrwy2H6ow== X-Proofpoint-ORIG-GUID: gTB6ZRVs3zgDAzlf8Xi3w2wW18OljPIY X-Proofpoint-GUID: gTB6ZRVs3zgDAzlf8Xi3w2wW18OljPIY X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-01_02,2026-05-28_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 phishscore=0 bulkscore=0 adultscore=0 spamscore=0 impostorscore=0 clxscore=1015 suspectscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606010065 On 29-05-2026 20:28, Bryan O'Donoghue wrote: >> Regarding cdm iommu we have excluded it as we do not use it to program registers as of now. > > Which will be a problem as soon as CDM is attempted to be enabled and yaml changes are dropped upstream. > > Hmm then it seems to me that five is too many for Agatti's IOMMU set. > > I'd like a number list so that we are discussing facts instead of nebulous hypotheticals. > > For both Agatti and Shikra. Here is the full IOMMU SID list for both platforms: Agatti (QCM2290): - 0x0400 0x00 — VFE non-protected - 0x0800 0x00 — CDM non-protected - 0x0820 0x00 — OPE read non-protected - 0x0840 0x00 — OPE write non-protected Shikra: - 0x0400 0x00 — VFE non-protected - 0x0600 0x00 — CDM non-protected - 0x0620 0x00 — OPE read non-protected - 0x0640 0x00 — OPE write non-protected Only VFE SID (0x0400) is shared between the two platforms. The current Shikra submission enumerates only the VFE SID. Should CDM and OPE each get a separate YAML binding like [1], or should both be part of the CAMSS YAML binding? If part of CAMSS, please confirm and we will add their SIDs in the DTS in the next revision. [1] https://lore.kernel.org/all/20260508-camss-isp-ope-v3-9-bb1055274603@oss.qualcomm.com/