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Mon, 19 Oct 2026 01:40:19 -0700 (PDT) X-Received: by 2002:a05:620a:a99a:20b0:93f:43a4:a48f with SMTP id af79cd13be357-93f43a4a566mr73829985a.5.1792399218887; Mon, 19 Oct 2026 01:40:18 -0700 (PDT) Received: from [192.168.226.26] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6b38a1eb8dbsm3515694a12.37.2026.10.19.01.40.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Oct 2026 01:40:18 -0700 (PDT) Message-ID: <73ab680a-ad47-4270-a7e9-48df70e86fed@oss.qualcomm.com> Date: Mon, 19 Oct 2026 10:40:15 +0200 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] soc: qcom: icc-bwmon: drop the bandwidth vote across system suspend To: =?UTF-8?B?UmFtw7NuIEplc8O6cyBNaXJhbmRh?= , Bjorn Andersson , Konrad Dybcio , Krzysztof Kozlowski Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20261018155424.1299645-1-ramonjesusmiranda@gmail.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20261018155424.1299645-1-ramonjesusmiranda@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Info: AW1haW4tMjYxMDE5MDAzNCBTYWx0ZWRfXyzSM0BkrfyJB CZep5vVbzb7x+iKgn3SvfB27aldG9RrN1BtOmI/IXI8hhKNzmRSudpyqR65BqpcWl1ADG0BuRWM IHW5HOAWIrg50o0W6AwNEFSkbRYBLhE= X-Authority-Analysis: v=2.4 cv=KuPYSmWN c=1 sm=1 tr=0 ts=6ad5d774 cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=Y7Fq6njcUQsdDXMDV7gA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=ZXulRonScM0A:10 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDE5MDAzNCBTYWx0ZWRfXzZrcVdSuG2qI sSJy9N1qzunV4r8AROmFNdGbv5ktAwCmZXVHthpO4zIr4sbQ21aZnjw7uXn9uH60Kax+WCEdO6Q AgG9p+2EShFjNp6XtvqUUMM4iTqOYcTSHR0Bsh89TAtvR3cPxKXGzOBwYmUh/u+81VkA8MvpVe7 D6I6EFyKou1rgAK08RzFVykd6vsrBnzLxzFXb6nLTb5YgYaFhW9gYhy0pzpH83aVhVg6hOdicDu Zdw/RIaoMNgx0HLIY2BaGCn/oIiPxbS2DOjzVFhjxX03jJtYyAFeM7jzCRLFLFGjVn1r17OWASX CPi62CJ2bLeI3h+ReT3PHMdPu5u50cOkI4YLW3F/iu+nHM2HJqxlAyMcsweTp2sk4mpzKvOVqhX M/Ew4J2LHeOlUumkpWDNwVh14b9wmTVYEPl5ne61sByWNxX/QN8UoR05sT1w8tyMoFjRl7JE9Yh Dj4czpq7uyA/VX1SdYg== X-Proofpoint-ORIG-GUID: YTYNgJUpfJLgEff5CzF1AUaQwIOKK164 X-Proofpoint-GUID: YTYNgJUpfJLgEff5CzF1AUaQwIOKK164 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-19_03,2026-10-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 bulkscore=0 priorityscore=1501 impostorscore=0 malwarescore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 adultscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610190034 On 10/18/26 5:54 PM, Ramón Jesús Miranda wrote: > icc-bwmon has no PM ops: the interconnect vote derived from the last > sample stays in place while the system is suspended. On X1E80100 the CPU > bwmon was left voting 800 MB/s peak on the DDR path during s2idle, which > keeps DDR out of its low power modes (the qcom_stats "ddr" counter never > advances). > > Disable the monitor, drop the OPP vote on suspend and restart monitoring > on resume. With this change DDR reaches its low power mode for >99% of > s2idle on a Microsoft Surface Pro 11 (X1E80100). Have you done a negative test (does reverting this patch alone break ddr collapse for you)? The DT uses ACTIVE_ONLY icc votes for BWMON, so as the CPU subsystem goes to sleep, these votes are removed in hardware. Konrad