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Wed, 15 Jul 2026 02:47:03 -0700 (PDT) X-Received: by 2002:ac8:570f:0:b0:51b:f40b:2fa2 with SMTP id d75a77b69052e-51cbf086adbmr143777621cf.1.1784108823148; Wed, 15 Jul 2026 02:47:03 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-69cd2936143sm2696576a12.25.2026.07.15.02.46.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Jul 2026 02:47:01 -0700 (PDT) Message-ID: <7c8178ec-8bab-4427-8faa-5b28cb76a5ad@oss.qualcomm.com> Date: Wed, 15 Jul 2026 11:46:58 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/7] irqchip/irq-qcom-mpm: Register MPM under CPU cluster power domain To: Sneh Mankad , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thomas Gleixner , Shawn Guo , Marc Zyngier Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260713-b4-shikra_lpm_addition-v1-0-3d858df2cbbf@oss.qualcomm.com> <20260713-b4-shikra_lpm_addition-v1-2-3d858df2cbbf@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260713-b4-shikra_lpm_addition-v1-2-3d858df2cbbf@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=Q63iJY2a c=1 sm=1 tr=0 ts=6a575718 cx=c_pps a=7E5Bxpl4vBhpaufnMqZlrw==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=9p2gFlySMKisLTOENoAA:9 a=QEXdDO2ut3YA:10 a=pJ04lnu7RYOZP9TFuWaZ:22 X-Proofpoint-ORIG-GUID: t3ocGFocbf74ZSuI7Eh7iC8Va0yUT0_J X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE1MDA5NCBTYWx0ZWRfX5mFMEZRavHd2 Yp5oZUMvCA42vthKuKs6TQIrnK0XfWFlncATIwYDA76NYlbE0ulBMpfSpc4nSwGM34/OEOiP5qb i7V2Eap2+SEbAn5lJuEBCqk9Tntl3ZA= X-Proofpoint-GUID: t3ocGFocbf74ZSuI7Eh7iC8Va0yUT0_J X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE1MDA5NCBTYWx0ZWRfX5UgjRP750PV1 z57ubYqM342I/bRt3p8DZnnNb4pY/YqkN7xC3FuBppZhqZuirE+VW/joyFDKRW3xIlPyb7TPHBU 2rwoOFrnO0ISj7D+OL2QdmRtHb+x1a5XGVpZBnKXxoGrOD62lo+2qaawlH76NHcH/GtGsRS9EIU q0uKNe+iqp9SuOX7j+rRanskySFqvBUSsD8Yf9K8td7+Aai1ktyl2ji/v78RQYN2spqZqN/36aV wCZcnYWBopLm4fwwVaAE3qn4LSjCjciA2OMVtOqZNly6XqhY+0C9fXvJgAOUV+3tGaWjwtsbJ7w HVIZqyu58RTTj8tV/2o3E3qD4YwXYUvhaPh24NQGxs2SqlXv/OWBargUd33etFH7OnQ6Tljt2YH atzE+3SPnZ4RbfGdAPVmhoLcf7VKfhaVJemE/KzxF57B/wtl/UCoGYgd3QzY4mFWZjLlz1sKQqA aOf8P84kQf24fQzFkbg== 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=2026-07-15_02,2026-07-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 adultscore=0 suspectscore=0 bulkscore=0 phishscore=0 impostorscore=0 malwarescore=0 priorityscore=1501 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607150094 On 7/13/26 12:25 PM, Sneh Mankad wrote: > MPM irqchip needs to notify RPM (Resource Power Manager) processor to read > the latest wake up capable interrupts when the CPU cluster is entering the > deepest idle state. This is done by sending IPC interrupt to RPM and is > implemented as .power_off() callback by registering MPM as parent power > domain to CPU cluster. [...] > If MPM has not registered with CPU cluster power domain, utilize the CPU PM > notifications to manage RPM communication when the last CPU goes to power > collapse. I have mixed feelings about this case. The RPMH RSC driver keeps that as a fallback for platforms which don't have PSCI OSI mode specifically. On the other hand, there are platforms (early arm64 - pre-msm8996 and almost all of the arm32 platforms) that don't define any CPU power domains, so perhaps it's necessary after all.. Konrad