From nobody Fri Apr 3 02:36:48 2026 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5DE69366823; Fri, 27 Feb 2026 11:11:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772190674; cv=none; b=Hes6l8YEyxIYp/FeXXbWE5D7cuRUodLe4tgxTu3TwDKVyYtLEClqI1E0AUQQ3ypSFa2es7W05XNE8QEju9AVBw9a7EJZElVhyH93L4ooRGMWHXS/EWVu4wJ6aHjcw1jclODJuWHDA1ss4PQb1nDCHc4zcXwXGfIHOft15TMRES4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772190674; c=relaxed/simple; bh=snyNUKIvd7XWja53UVlMyeK251s62/K3kOt8+5tgnT8=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=DvbPqIXrv91NlliXEcXlHZXQCvJRNqf409D8miWRHnL9Kus4FlfScjzzgqGduk+Ootp3Y5NnDjcTnd3ap/obM5lTNbbHa6MdEldjCMOGWjXoVlbpHZm5iqXrytLyje83k4Z2BOaKpzZT77YWm+7XsiTgH7q4z77gwbGzaBFZS84= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=qti.qualcomm.com; spf=pass smtp.mailfrom=qualcomm.com; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b=F2BQ1lWB; arc=none smtp.client-ip=205.220.168.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=qti.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b="F2BQ1lWB" Received: from pps.filterd (m0279866.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 61RACPHM1600684; Fri, 27 Feb 2026 11:11:09 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:message-id :mime-version:subject:to; s=qcppdkim1; bh=sItlUAJ3Qw9ep6QyDy/09u OGRzuOE/equ7QoDolV5rs=; b=F2BQ1lWBEnUDKYpT02GWXP2Qb/szQ7gpEqeC70 hkppqGk1fMC9xNgb2n2dcjNN0qJW/3dOzrxYIyqX5/E5UKoCC6iLDQbucyYklEqN v7OZlA6fN/2WSLXXsXEzhNpENrL1Oarw0lUXkwSJGEn0FewPcpTjdKNltjoiOJ/B V7cA6atyiiJ02gXPao5agw6bP18+FzbF8/LrRrU6iuZGIIzZ8vb9krWZ7Bs09s+B YytCPTrN8iEN1wk56Ba0tuauP5f6l8nOt0gnetoyGr1oAuzmZIUv57axQtpn8M6B minKgATVApZMwI9ynW09jM09f5cD/ei7DVaxxWWClq4XDEDg== Received: from apblrppmta01.qualcomm.com (blr-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.18.19]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4cjt99uajf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Feb 2026 11:11:08 +0000 (GMT) Received: from pps.filterd (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTP id 61RBB581012023; Fri, 27 Feb 2026 11:11:05 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTPS id 4cf5smuasw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Feb 2026 11:11:05 +0000 Received: from APBLRPPMTA01.qualcomm.com (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 61RBB5UQ012015; Fri, 27 Feb 2026 11:11:05 GMT Received: from hu-devc-hyd-u22-c.qualcomm.com (hu-pussin-hyd.qualcomm.com [10.147.247.182]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTPS id 61RBB5dX012012 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Feb 2026 11:11:05 +0000 Received: by hu-devc-hyd-u22-c.qualcomm.com (Postfix, from userid 4706513) id 2AC055A2; Fri, 27 Feb 2026 16:41:04 +0530 (+0530) From: Pushpendra Singh To: Krzysztof Kozlowski , Bjorn Andersson , Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Shivnandan Kumar , Pushpendra Singh Subject: [PATCH v3] soc: qcom: icc-bwmon: Update zone1_thres_count to 3 Date: Fri, 27 Feb 2026 16:40:51 +0530 Message-Id: <20260227111051.1789439-1-pussin@qti.qualcomm.com> X-Mailer: git-send-email 2.34.1 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: quoted-printable X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Authority-Analysis: v=2.4 cv=IZWKmGqa c=1 sm=1 tr=0 ts=69a17bcd cx=c_pps a=Ou0eQOY4+eZoSc0qltEV5Q==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=VwQbUJbxAAAA:8 a=COk6AnOGAAAA:8 a=EUspDBNiAAAA:8 a=RGsjnBcAIkQE9p9hHc4A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=TjNXssC_j7lpFel5tvFf:22 X-Proofpoint-GUID: _SqqY6_eqxqpisvmGDbfuKCzuY-vwhsG X-Proofpoint-ORIG-GUID: _SqqY6_eqxqpisvmGDbfuKCzuY-vwhsG X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI3MDA5NyBTYWx0ZWRfX90FFLTbBsasA 9/fPclgRmkKCqUE42fi47ZFR4lbzbERnElp8xUR75cCBN10Ro0/VFy/dzZYNFIu2sv9bEWjm/Qo +60BrDH8JnxQfqNN6/d5A6hXyDT6jp9B5265QDmGvQ4HJjTNh8e4KTCfijHy7Cand/4NUJroV7Y jBlQGGZVmBQrFpkdpDC1HHTK/qp7Rq4kdb13Np/o8iQxB5QPMkEc0HamMRKdr+nvo0q230oTkGD dJNLS+HGE0mZkRLF+7kDhSdi2yKDo1RLKyCQ9aYb7ephIttFFf/rpvleOTbLk0TJgMQiuE0Hac5 uw4tujDGykbyzvIQ7fBQgYl/BXtLl5LLaY9b+EGMcoA0tbxWbvbo+4w2PSPksGCfn/WneDqSbvx ICdP1ynZitoU5d3yA538byNpa1UCgscihN2jHiyJkaYbMF+DW9DAkyqZH17DvUcOx5qAHe6kVfa elVwvGV4lzgpSxNE68w== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-27_01,2026-02-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 clxscore=1011 adultscore=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 malwarescore=0 spamscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2602270097 From: Shivnandan Kumar Reduce zone1_thres_count from 16 to 3 so the driver can lower the bus vote after 3 sample windows instead of waiting for 16. The previous 16=E2=80=91window delay (~64 ms) is too long at higher FPS workloads, causing delayed decision making and measurable power regression. Empirical tuning showed that lower values (e.g., 2) made bwmon behavior jittery, while higher values (4=E2=80=936) were stable but less responsive = and reduced power savings. A value of 3 provided the best balance: responsive enough for timely power reduction while maintaining stable bwmon operation. Significant power savings were observed across multiple use cases when reducing the threshold from 16 to 3: USECASE zone1_thres_count=3D16 zone1_thres_count=3D3 4K video playback 236.15 mA 203.15 mA Sleep 7mA 6.9mA Display (idle display) 71.95mA 67.11mA Signed-off-by: Shivnandan Kumar Signed-off-by: Pushpendra Singh --- Chages in v3: - Update commit message - Link to v2: https://lore.kernel.org/lkml/d72182bc-f8d4-4314-b2f1-c9242618= eb67@quicinc.com/ Changes in v2: - Update commit message - Link to v1: https://lore.kernel.org/lkml/463eb7c8-00fc-4441-91d1-6e48f6b0= 52c8@quicinc.com --- drivers/soc/qcom/icc-bwmon.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/soc/qcom/icc-bwmon.c b/drivers/soc/qcom/icc-bwmon.c index 597f9025e422..e46975da7dba 100644 --- a/drivers/soc/qcom/icc-bwmon.c +++ b/drivers/soc/qcom/icc-bwmon.c @@ -830,7 +830,7 @@ static const struct icc_bwmon_data msm8998_bwmon_data = =3D { static const struct icc_bwmon_data sdm845_cpu_bwmon_data =3D { .sample_ms =3D 4, .count_unit_kb =3D 64, - .zone1_thres_count =3D 16, + .zone1_thres_count =3D 3, .zone3_thres_count =3D 1, .quirks =3D BWMON_HAS_GLOBAL_IRQ, .regmap_fields =3D sdm845_cpu_bwmon_reg_fields, @@ -849,7 +849,7 @@ static const struct icc_bwmon_data sdm845_llcc_bwmon_da= ta =3D { static const struct icc_bwmon_data sc7280_llcc_bwmon_data =3D { .sample_ms =3D 4, .count_unit_kb =3D 64, - .zone1_thres_count =3D 16, + .zone1_thres_count =3D 3, .zone3_thres_count =3D 1, .quirks =3D BWMON_NEEDS_FORCE_CLEAR, .regmap_fields =3D sdm845_llcc_bwmon_reg_fields, --=20 2.34.1