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Thu, 22 Oct 2026 03:14:31 -0700 (PDT) Received: from [192.168.226.26] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c468a5dd548sm89397066b.65.2026.10.22.03.14.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Oct 2026 03:14:30 -0700 (PDT) Message-ID: Date: Thu, 22 Oct 2026 12:14:17 +0200 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 3/4] arm64: dts: qcom: msm8917: Use a shallower cluster state to fix unresponsive idle To: Reza Kurniawan , Mark Rutland , Lorenzo Pieralisi , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Ulf Hansson , "Rafael J. Wysocki" , Daniel Lezcano , Christian Loehle , Bjorn Andersson , Konrad Dybcio , Abel Vesa , Val Packett Cc: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org References: <20261022-psci-fix-v3-0-9ce2133c5659@gmail.com> <20261022-psci-fix-v3-3-9ce2133c5659@gmail.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20261022-psci-fix-v3-3-9ce2133c5659@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=JudkP84C c=1 sm=1 tr=0 ts=6ad9e209 cx=c_pps a=HLyN3IcIa5EE8TELMZ618Q==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=pGLkceISAAAA:8 a=VTptWAqQFsUFMNnqaZMA:9 a=QEXdDO2ut3YA:10 a=bTQJ7kPSJx9SKPbeHEYW:22 X-Proofpoint-ORIG-GUID: yMToqkxMJSBPZgrxRBis3zf-VDjY-Ey9 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIyMDA0MCBTYWx0ZWRfX7Zt04lTtMHOy xAm5RP5hvaKfHqMacrmmE69Ntd+O9hQc0BhpVt6tHG8UKgc7UQAttiNAjuOoLB4o3xftNHudHwK ZRpnLixdxViYk4bzvaBcshZiR411VfU= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIyMDA0MCBTYWx0ZWRfX0eZbUMskO0sz /BI4OsR9gDdFuvG8qG786PEfsUxkv/Bcym5PZfoVBwncdOlF+eP0o95weUFMb5ojWFeI0R1qnvi bjsILlvsyT8aHDK49xvIE+jRLATAbKUthfMo5xIVCJSKd+xqW0GC2TffxcYnzOSVSio/mtxA6oj ptgln5S9yCbNxJNbiffQOb2viiBwzogZ0gf/kIMg29+O1SFELKEV5sCR2+/JKAZMqnMBCLPGKWA /nzImhQpMPCtkUvrNlesocwYCqTmSf5gaE/LDKUAxc7Mae/pB09kgNqHURIG++o3/F1xp0tFKdd unGSozk1/KWAceP52oogV3/0l5wWzctnjaxyJdNz3naocTscRsWNXbPAqQjuaFDTNYK4sIeVJvg OfixunsgxlqHHDrjp5F7xlAMhifCCo0Iyl5T/ctO80VquExsyf94Ld6mgTyJFLnROqAtNwpeX+3 uWD8Q9QerVMnWC+0Mtg== X-Proofpoint-GUID: yMToqkxMJSBPZgrxRBis3zf-VDjY-Ey9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-22_04,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 malwarescore=0 impostorscore=0 suspectscore=0 spamscore=0 lowpriorityscore=0 adultscore=0 phishscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610220040 On 10/22/26 11:41 AM, Reza Kurniawan wrote: > MSM8917 is a single cluster SoC, so powering down the cluster means > powering down the whole system. This causes two problems: > > 1. The system becomes unresponsive, even to common interrupts. Waking it > requires an interrupt from the MPM (MSM Power Manager) or scheduling > the MPM to wake the system later. Linux currently has no way of doing > the latter, so the cluster may never resume operation. > > 2. Entering power collapse blanks the screen. When the state is entered > and exited repeatedly, this shows up as visible flicker. > > Even if MPM scheduling were implemented, the second problem would remain > and it wouldn't fix the system being unresponsive at idle. > > Replace the idle state with PSCI mode 4 (dubbed GDHS downstream), which > is less aggressive and can wake up from conventional interrupt sources. > > Signed-off-by: Reza Kurniawan > --- https://lore.kernel.org/lkml/20261005-s2idle_state-v1-0-3c402c66f388@oss.qualcomm.com/ and https://lore.kernel.org/lkml/20261015-b4-shikra_lpm_addition-v2-0-ac7f1a0d5638@oss.qualcomm.com/ are in flight, you may want to integrate/test them locally! Reviewed-by: Konrad Dybcio Konrad