From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id ACCADC433F5 for ; Wed, 24 Nov 2021 13:44:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346886AbhKXNr4 (ORCPT ); Wed, 24 Nov 2021 08:47:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:37394 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348644AbhKXNo3 (ORCPT ); Wed, 24 Nov 2021 08:44:29 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6671461929; Wed, 24 Nov 2021 12:59:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637758780; bh=NfPyr9IlCDfBsxnZ/l72Ps3Kcil/CP535+5XrY0/ZvM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LKT1OWQpy8/uUrjqFgUGQE+5dMu1G7IgAhJWRSwLIhd/XwWjglaOCn0i9eogtKg79 16s+sL1TLAQ/XRpRFiktrdJjJjVbqH/hHYNFnpLKmkOAnuwJuqJ3iI0Oaff0SvN5IB CfAIlWQ5jCiU1wTO20ZRExwmyZAx39r0dUZXA3pk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, AngeloGioacchino Del Regno , Bjorn Andersson , Sasha Levin Subject: [PATCH 5.15 027/279] arm64: dts: qcom: msm8998: Fix CPU/L2 idle state latency and residency Date: Wed, 24 Nov 2021 12:55:14 +0100 Message-Id: <20211124115719.682367093@linuxfoundation.org> X-Mailer: git-send-email 2.34.0 In-Reply-To: <20211124115718.776172708@linuxfoundation.org> References: <20211124115718.776172708@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: AngeloGioacchino Del Regno [ Upstream commit 3f1dcaff642e75c1d2ad03f783fa8a3b1f56dd50 ] The entry/exit latency and minimum residency in state for the idle states of MSM8998 were ..bad: first of all, for all of them the timings were written for CPU sleep but the min-residency-us param was miscalculated (supposedly, while porting this from downstream); Then, the power collapse states are setting PC on both the CPU cluster *and* the L2 cache, which have different timings: in the specific case of L2 the times are higher so these ones should be taken into account instead of the CPU ones. This parameter misconfiguration was not giving particular issues because on MSM8998 there was no CPU scaling at all, so cluster/L2 power collapse was rarely (if ever) hit. When CPU scaling is enabled, though, the wrong timings will produce SoC unstability shown to the user as random, apparently error-less, sudden reboots and/or lockups. This set of parameters are stabilizing the SoC when CPU scaling is ON and when power collapse is frequently hit. Signed-off-by: AngeloGioacchino Del Regno Signed-off-by: Bjorn Andersson Link: https://lore.kernel.org/r/20210901183123.1087392-3-angelogioacchino.delregno@somainline.org Signed-off-by: Sasha Levin --- arch/arm64/boot/dts/qcom/msm8998.dtsi | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/arch/arm64/boot/dts/qcom/msm8998.dtsi b/arch/arm64/boot/dts/qcom/msm8998.dtsi index 34039b5c80175..5a221cfc41387 100644 --- a/arch/arm64/boot/dts/qcom/msm8998.dtsi +++ b/arch/arm64/boot/dts/qcom/msm8998.dtsi @@ -308,38 +308,42 @@ LITTLE_CPU_SLEEP_0: cpu-sleep-0-0 { compatible = "arm,idle-state"; idle-state-name = "little-retention"; + /* CPU Retention (C2D), L2 Active */ arm,psci-suspend-param = <0x00000002>; entry-latency-us = <81>; exit-latency-us = <86>; - min-residency-us = <200>; + min-residency-us = <504>; }; LITTLE_CPU_SLEEP_1: cpu-sleep-0-1 { compatible = "arm,idle-state"; idle-state-name = "little-power-collapse"; + /* CPU + L2 Power Collapse (C3, D4) */ arm,psci-suspend-param = <0x40000003>; - entry-latency-us = <273>; - exit-latency-us = <612>; - min-residency-us = <1000>; + entry-latency-us = <814>; + exit-latency-us = <4562>; + min-residency-us = <9183>; local-timer-stop; }; BIG_CPU_SLEEP_0: cpu-sleep-1-0 { compatible = "arm,idle-state"; idle-state-name = "big-retention"; + /* CPU Retention (C2D), L2 Active */ arm,psci-suspend-param = <0x00000002>; entry-latency-us = <79>; exit-latency-us = <82>; - min-residency-us = <200>; + min-residency-us = <1302>; }; BIG_CPU_SLEEP_1: cpu-sleep-1-1 { compatible = "arm,idle-state"; idle-state-name = "big-power-collapse"; + /* CPU + L2 Power Collapse (C3, D4) */ arm,psci-suspend-param = <0x40000003>; - entry-latency-us = <336>; - exit-latency-us = <525>; - min-residency-us = <1000>; + entry-latency-us = <724>; + exit-latency-us = <2027>; + min-residency-us = <9419>; local-timer-stop; }; }; -- 2.33.0