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Tue, 26 May 2026 00:49:22 -0700 (PDT) X-Received: by 2002:a05:6a00:6c8e:b0:82f:5576:2853 with SMTP id d2e1a72fcca58-8415f5a63f9mr17116150b3a.30.1779781761773; Tue, 26 May 2026 00:49:21 -0700 (PDT) Received: from [10.151.36.45] ([202.46.23.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84164fb28d5sm11934235b3a.41.2026.05.26.00.49.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 26 May 2026 00:49:21 -0700 (PDT) Message-ID: <75a9fec5-20b2-496f-a365-2b1201fcbd60@oss.qualcomm.com> Date: Tue, 26 May 2026 13:19:15 +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 Subject: Re: [PATCH 0/2] Add CDSP Power Manangement Driver To: Krzysztof Kozlowski Cc: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Liam Girdwood , Mark Brown , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Praveenkumar I , Manikanta Mylavarapu References: <20260520-cdsp-power-v1-0-85eb9501a1cd@oss.qualcomm.com> <20260520-precious-notorious-hyena-7ba95b@quoll> Content-Language: en-US From: Vignesh Viswanathan In-Reply-To: <20260520-precious-notorious-hyena-7ba95b@quoll> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=dtfrzVg4 c=1 sm=1 tr=0 ts=6a155082 cx=c_pps a=Qgeoaf8Lrialg5Z894R3/Q==:117 a=j4ogTh8yFefVWWEFDRgCtg==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=uzc-zwSIlv-cvvK2V8IA:9 a=QEXdDO2ut3YA:10 a=x9snwWr2DeNwDh03kgHS:22 X-Proofpoint-GUID: D9BWvsl0PmL3kpLVQENJjBn9H_sR7Le2 X-Proofpoint-ORIG-GUID: D9BWvsl0PmL3kpLVQENJjBn9H_sR7Le2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTI2MDA2NyBTYWx0ZWRfX2Rz8NOi0lE8k +oPwj0klRvyVQ+/ST4mvSUhRCZ81HyCMZb2TNl9PUULzNRIkOsKMoJAN0V8e25VKaqB2RQD6AVz vO+DIsD7bmUcREJbCAPn9lUzhxLclzcbQODtHGruj9Dt3rxOARK6SHtqAi9dtTPKIaZZseILJzC Msa3i+2qK6MEoAl+/2kdaWyIIDu1mCg9jnfgAIU/6Ehld/6J65Dc7AR3kE39tDlNwqXKXruu33Q NtIyPRFJePrYvvsSA6ORFrsnqKzRJZYiXrzkSU4VmQbw9Jc3H7u2QujDn4pZCb3OPEBoO9mHVuN AkbGs6fuWRZ8pgZG8cNmAk03hSfLxRcLMq/KLRxRf8ReJfXsqih0fd201VlOVyQCSKeib3+9uRP 4Z6BCzNByKfftqiLPzkekpH8TXGpAKKPlE2J8FZinEysIDi3rLqI3y2iVCtqrKH/XBWm0u9ZAij F1PTpcQwBwJUfxLEpsQ== 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=2026-05-26_01,2026-05-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 suspectscore=0 bulkscore=0 phishscore=0 adultscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605260067 On 5/20/2026 4:14 PM, Krzysztof Kozlowski wrote: > On Wed, May 20, 2026 at 12:35:08AM +0530, Vignesh Viswanathan wrote: >> 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 > > Power management drivers CANNOT go to drivers/soc. Ack. > >> >> Vignesh Viswanathan (1): >> dt-bindings: soc: qcom: Document CDSP Power Management > > Neither to bindings soc. Ack, As per Bjorn's review, this CDSP power management driver + standard PAS driver will be a non-standard implementation and I'm looking at moving this into a new remoteproc driver. Will address in next version. Thanks, Vignesh > > Best regards, > Krzysztof >