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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-65bad3e3538sm4771046a12.20.2026.02.20.01.41.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 20 Feb 2026 01:41:05 -0800 (PST) Message-ID: <8e670f28-9a2e-4495-9b84-8b1d9c0542ba@oss.qualcomm.com> Date: Fri, 20 Feb 2026 10:41:03 +0100 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] arm64: dts: qcom: hamoa/x1: fix idle exit latency To: Daniel J Blueman , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maulik Shah Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260220070204.101672-1-daniel@quora.org> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260220070204.101672-1-daniel@quora.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjIwMDA4NCBTYWx0ZWRfX4iHX7b02lBzt 8YDrazpXI3Z0NiG9XX/61dPOt9BcLhhbF8FfXOv7JopfOohOW/pcprIZXY09njHFcq8K4vbVEDC nmrokHf8BkQqoBbCa+g+JFWDatfKblaO9n9rIrXd62WuWuUAcZhW/8VHrvxOoACzJTwrurxY8np FNuMJhdQ1QHp4oYlKEd3TAXTGa4PVM8bcEhu41i8hHhqeZMayLqdL943BkuC7dXZQOpEIt74zEQ jOEfkGRdmT0eDgWcNr6SesR/Gt5jvgagqcNg1m9mu4OmoRUHzKruEl0ux4dtw3cFBj+3V9j+VU+ /5qeqQXwyIhAf2PBr8tfaAz76LvgLvsPlKW7j39Ck7EpA+yeINUc1fOmYmrDHYMSOirLSbeapwN P8bQEez1BPPZ9+ltjdrqGGiaiHl1CKTEDtSzPA65ZW3D5pUlV/+gVYi4JeSuAXNvkdH64HxZJzE P9/tCCpImTSsGdFcpNQ== X-Proofpoint-ORIG-GUID: A3xaJ1XzpItl8vdNMeaU3QyyvSZ7O12m X-Authority-Analysis: v=2.4 cv=K6Ev3iWI c=1 sm=1 tr=0 ts=69982c33 cx=c_pps a=HLyN3IcIa5EE8TELMZ618Q==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=t9ty7G3lAAAA:8 a=CtgGTwNqbZ-k40dbDgUA:9 a=QEXdDO2ut3YA:10 a=bTQJ7kPSJx9SKPbeHEYW:22 a=CsAS6f0m0zARWR-uHzm3:22 X-Proofpoint-GUID: A3xaJ1XzpItl8vdNMeaU3QyyvSZ7O12m 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=2026-02-20_01,2026-02-20_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 spamscore=0 malwarescore=0 clxscore=1015 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602200084 On 2/20/26 8:02 AM, Daniel J Blueman wrote: > Designs based on the Qualcomm X1 Hamoa reference platform report: > driver: Idle state 1 target residency too low > > This is because the declared X1 idle entry plus exit latency of 680us > exceeds the declared minimum 600us residency time: > entry-latency-us = <180>; > exit-latency-us = <500>; > min-residency-us = <600>; > > As 500us idle exit latency is overly conservative, fix this to be a more > realistic 200us, in range of similar silicon. Tested on a Lenovo Yoga Slim > 7x with Qualcomm X1E-80-100. > > Signed-off-by: Daniel J Blueman > --- > arch/arm64/boot/dts/qcom/hamoa.dtsi | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/boot/dts/qcom/hamoa.dtsi b/arch/arm64/boot/dts/qcom/hamoa.dtsi > index a17900eacb20..b870f4dc9c42 100644 > --- a/arch/arm64/boot/dts/qcom/hamoa.dtsi > +++ b/arch/arm64/boot/dts/qcom/hamoa.dtsi > @@ -269,7 +269,7 @@ cluster_c4: cpu-sleep-0 { > idle-state-name = "ret"; > arm,psci-suspend-param = <0x00000004>; > entry-latency-us = <180>; > - exit-latency-us = <500>; > + exit-latency-us = <200>; > min-residency-us = <600>; +Maulik? Konrad