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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-83f19794e6esm17423401b3a.25.2026.05.19.12.05.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 May 2026 12:05:17 -0700 (PDT) From: Vignesh Viswanathan Subject: [PATCH 0/2] Add CDSP Power Manangement Driver Date: Wed, 20 May 2026 00:35:08 +0530 Message-Id: <20260520-cdsp-power-v1-0-85eb9501a1cd@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=H4sIAGW0DGoC/x3MQQqAIBBG4avIrBNGIbGuEi2i/mo2KgoVSHdPW n6L9yoVZEGhUVXKuKRIDA2mU7SeSzigZWsmy9Zxbwa9biXpFG9kzQAcs/XwhlqQMnZ5/tk0v+8 HJOgmrlwAAAA= To: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Liam Girdwood , Mark Brown , Vignesh Viswanathan Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Praveenkumar I , Manikanta Mylavarapu X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1779217514; l=1736; i=vignesh.viswanathan@oss.qualcomm.com; s=20260518; h=from:subject:message-id; bh=C7CEQQmP96TDGF4BbZh1KMNko2GsC/BByDb8SSpMAfQ=; b=CAGuwh8fTWjur/IxwwvTeIfB9DykAlHTz8PdHF3tm2yr59mmmCUFjh/N0IG7vsLOclubcIxCv rAM5X8nd+sdBVwaKAcXs2sHinBRa7z7qq7NHU29+21Peq9edWC7rwG/ X-Developer-Key: i=vignesh.viswanathan@oss.qualcomm.com; a=ed25519; pk=/lHspsTTqZQg546ZudgrbywCsk3Whx/C0XNVUevaKNk= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTE5MDE5MCBTYWx0ZWRfXxJwtF9Rol2r7 ykP8WYlZickOeFc0lD/9rDJxIHzk02jG2LVo7fIwgFSh3CEjpprkGVfjeSg0yujARB9spp6Y0rc 8gy421z6LDVcS81vk6pNvU2qTxiwSHagWtPRGsV+uHyK/9agWOuSGfKCzP9nClssAIRhm20UOaw BfEBQvZZLSrqCgRxvDV87IGKeP9GPk3pxM5vS6yxN+6Dz+DFLvJNjl2r2fLL12hxtgcIqMPiEoD YptjKTPJo4Ine0stGIpZfREWeb3J/2/jNG+nFOCZ1zSB7YHRitpKsYldx8t4I+wmm9jX4jyDSba 5rhrt29HjbVTLlCeXowGZ0TTOw8LVs5c4Zk+kWIjrNO4G+li3S9Zo/tRWiXTE8VzSzimPRvZkOn 4WIBGiN3z1jwRmjS12kcTKDIByvfO4o4BOwv1ehzj0GGIkeRatJQ7eBSReCN4HeeNGPeqNkI5lz 1tjSXzAGPxiBCauw+tw== X-Proofpoint-GUID: BU25r1KyVcatpq86X2Jbh9gcz3wfn9Ky X-Proofpoint-ORIG-GUID: BU25r1KyVcatpq86X2Jbh9gcz3wfn9Ky X-Authority-Analysis: v=2.4 cv=Mr9iLWae c=1 sm=1 tr=0 ts=6a0cb46f cx=c_pps a=m5Vt/hrsBiPMCU0y4gIsQw==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=4IyOyT_C9-gSaBXp73cA:9 a=QEXdDO2ut3YA:10 a=IoOABgeZipijB_acs4fv:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-19_05,2026-05-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 bulkscore=0 impostorscore=0 spamscore=0 phishscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605190190 On platforms like IPQ9650, the CDSP subsystem cannot manage its own power rails and requires the APSS to handle power management on its behalf. Add a platform driver to fulfill this role. Handle LPM (Low Power Mode) by executing hardware isolation and restoration sequences via MPM register programming, coordinated with the NSP Q6 through a handshake protocol. Support both FULL_PC (CX+MX collapse) and LONG_APCR (CX-only) modes, detected dynamically at runtime. Handle DCVS (Dynamic Clock and Voltage Scaling) requests from the NSP Q6 received via a shared SMEM channel. Apply voltages via the regulator framework and write responses back to SMEM. Expose virtual cdsp-vdd-cx and cdsp-vdd-mx regulators so that the PAS remoteproc driver can control the NSP power rails through the standard regulator framework. This driver functionally depends on [1] for bringing up the CDSP on IPQ9650, but there is no compile time dependency. [1] https://lore.kernel.org/linux-arm-msm/20260519-mp8899-regulator-driver-v1-0-30d14421b7f1@oss.qualcomm.com/T/#t --- Praveenkumar I (1): soc: qcom: Add CDSP power management driver Vignesh Viswanathan (1): dt-bindings: soc: qcom: Document CDSP Power Management .../bindings/soc/qcom/qcom,cdsp-power.yaml | 138 +++ drivers/soc/qcom/Kconfig | 17 + drivers/soc/qcom/Makefile | 1 + drivers/soc/qcom/cdsp_power.c | 1065 ++++++++++++++++++++ 4 files changed, 1221 insertions(+) --- base-commit: 6a50ba100ace43f43c87384367eb2d2605fcc16c change-id: 20260519-cdsp-power-0eee60028e81 Best regards, -- Vignesh Viswanathan