From patchwork Wed Mar 16 21:09:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Li X-Patchwork-Id: 552463 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 E822BC433F5 for ; Wed, 16 Mar 2022 21:10:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358136AbiCPVLx (ORCPT ); Wed, 16 Mar 2022 17:11:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34936 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358127AbiCPVLs (ORCPT ); Wed, 16 Mar 2022 17:11:48 -0400 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8D1F466C81 for ; Wed, 16 Mar 2022 14:10:31 -0700 (PDT) Received: by mail-pl1-x62a.google.com with SMTP id n2so2818620plf.4 for ; Wed, 16 Mar 2022 14:10:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=squareup.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=iRv99gRR+dDFqt3eRpswNmiSreBZ631Owy00tW6yZcU=; b=c37P/rYSqo6TcipSclHSiCTCd0xxWgz89Nf4rmIGY9y9jjel7xO28Lmh9gP6nJlR0C LX5ks4TT5WXNA3tYH4d2s8i/VdLCtak+f0FgUZmmbZbGLTd/WUV0Q+6D+AlTnhth42Fj pMdDo4lnir731OXifK8eqYIBmm9smt3/PbitM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=iRv99gRR+dDFqt3eRpswNmiSreBZ631Owy00tW6yZcU=; b=RCGXADGeO/2qC8rqrCaUW8SrAiVcW+wlPE8n+25MQo7RMb44ok6oBvXFrptrSp5Qaw dGbPyNgB4qnW1UMnvo1iBHn8zWVfIzVKEn/T/YslpxnSJOwXfy0xK2W9aJFf/RKkjngw X4phEQfVNbLWLBp2xsLaSuPw+IaGvzV+lL+bGF6S/tMC/k2mQdL/Xese9htrcHjDTFoy 8rQSXuH/VRW6AyE13dIsj83e0weU6Arpxds249mz7LlXH+9StuikmS3xlrFqUnfjIml0 r8z4O4eq+bIwh/QRRwfKymfFf+qDdqAavoFZsxDAAxBPq3xzvcB1a9DmaCx+uPMjjEII 2RlQ== X-Gm-Message-State: AOAM5327tPsh7pcgGMJLJ8K1huFp+18sweP8yG21WB1oTH3gUwAvH0dx weZvdiqNmi+icHOOM584bwfVYA== X-Google-Smtp-Source: ABdhPJyhIbq2BD3mzyRKhiWn/+GC/52p+XjCj0nGHchwnpXbu+hGsVhnES70nSuyfEp5Tl3by9Q81g== X-Received: by 2002:a17:90a:6003:b0:1c6:64a9:2155 with SMTP id y3-20020a17090a600300b001c664a92155mr1740666pji.30.1647465030726; Wed, 16 Mar 2022 14:10:30 -0700 (PDT) Received: from localhost ([135.84.132.250]) by smtp.gmail.com with ESMTPSA id f21-20020a056a00239500b004f7a6d338c3sm4386234pfc.41.2022.03.16.14.10.29 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 16 Mar 2022 14:10:30 -0700 (PDT) From: Benjamin Li To: Daniel Lezcano , Amit Kucheria , Thara Gopinath Cc: Bjorn Andersson , Zac Crosby , Benjamin Li , Andy Gross , "Rafael J. Wysocki" , Zhang Rui , linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] drivers: thermal: tsens: implement change_mode to disable sensor IRQs Date: Wed, 16 Mar 2022 14:09:45 -0700 Message-Id: <20220316210946.6935-3-benl@squareup.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220316210946.6935-1-benl@squareup.com> References: <20220316210946.6935-1-benl@squareup.com> Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Implement change_mode() to disable sensor IRQs when a sensor is disabled. Note that this commit does not touch: - The tsens device's CPU IRQ, which is global across all sensors on a tsens device. - Power/clock of the sensor. Future work is needed in the tsens_ops interface to support single-sensor disable + handle quirks (the only implementation of tsens_ops->enable and disable only supports individual enable/disable on some sensors, and others must be enabled/disabled as a block). 'echo disabled > .../thermal_zoneX/mode' will disable the thermal core's polling mechanism to check for threshold trips. However, tsens supports an interrupt mechanism to receive notification of trips, implemented in commit 634e11d5b450 ("drivers: thermal: tsens: Add interrupt support"). This is used sometimes to run performance test cases. Currently the thermal zone mode that's set by userspace does not control threshold trip events from IRQs. Let's fix this to restore the abilty to disable thermal throttling at runtime. ==================== Tested on MSM8939 running 5.17. This platform has 8 cores; the first four thermal zones control cpu0-3 and the last zone is for the other four CPUs together. for f in /sys/class/thermal/thermal_zone*; do echo "disabled" > $f/mode echo $f | paste - $f/type $f/mode done /sys/class/thermal/thermal_zone0 cpu0-thermal disabled /sys/class/thermal/thermal_zone1 cpu1-thermal disabled /sys/class/thermal/thermal_zone2 cpu2-thermal disabled /sys/class/thermal/thermal_zone3 cpu3-thermal disabled /sys/class/thermal/thermal_zone4 cpu4567-thermal disabled With mitigation thresholds at 75 degC and load running, we can now cruise past temp=75000 without CPU throttling kicking in. watch -n 1 "grep '' /sys/class/thermal/*/temp /sys/class/thermal/*/cur_state /sys/bus/cpu/devices/cpu*/cpufreq/cpuinfo_cur_freq" /sys/class/thermal/thermal_zone0/temp:82000 /sys/class/thermal/thermal_zone1/temp:84000 /sys/class/thermal/thermal_zone2/temp:87000 /sys/class/thermal/thermal_zone3/temp:84000 /sys/class/thermal/thermal_zone4/temp:84000 /sys/class/thermal/cooling_device0/cur_state:0 /sys/class/thermal/cooling_device1/cur_state:0 /sys/bus/cpu/devices/cpu0/cpufreq/cpuinfo_cur_freq:1113600 /sys/bus/cpu/devices/cpu1/cpufreq/cpuinfo_cur_freq:1113600 /sys/bus/cpu/devices/cpu2/cpufreq/cpuinfo_cur_freq:1113600 /sys/bus/cpu/devices/cpu3/cpufreq/cpuinfo_cur_freq:1113600 /sys/bus/cpu/devices/cpu4/cpufreq/cpuinfo_cur_freq:800000 /sys/bus/cpu/devices/cpu5/cpufreq/cpuinfo_cur_freq:800000 /sys/bus/cpu/devices/cpu6/cpufreq/cpuinfo_cur_freq:800000 /sys/bus/cpu/devices/cpu7/cpufreq/cpuinfo_cur_freq:800000 Reported-by: Zac Crosby Reviewed-by: Bjorn Andersson Signed-off-by: Benjamin Li --- drivers/thermal/qcom/tsens.c | 43 ++++++++++++++++++++++++++++++++++-- drivers/thermal/qcom/tsens.h | 4 ++++ 2 files changed, 45 insertions(+), 2 deletions(-) diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c index 99a8d9f3e03c..d5263436f959 100644 --- a/drivers/thermal/qcom/tsens.c +++ b/drivers/thermal/qcom/tsens.c @@ -564,8 +564,12 @@ static int tsens_set_trips(void *_sensor, int low, int high) /* Write the new thresholds and clear the status */ regmap_field_write(priv->rf[LOW_THRESH_0 + hw_id], low_val); regmap_field_write(priv->rf[UP_THRESH_0 + hw_id], high_val); - tsens_set_interrupt(priv, hw_id, LOWER, true); - tsens_set_interrupt(priv, hw_id, UPPER, true); + s->trips_configured = true; + + if (s->enable_irqs) { + tsens_set_interrupt(priv, hw_id, LOWER, true); + tsens_set_interrupt(priv, hw_id, UPPER, true); + } spin_unlock_irqrestore(&priv->ul_lock, flags); @@ -575,6 +579,40 @@ static int tsens_set_trips(void *_sensor, int low, int high) return 0; } +static int tsens_change_mode(void *_sensor, enum thermal_device_mode mode) +{ + struct tsens_sensor *s = _sensor; + struct tsens_priv *priv = s->priv; + u32 hw_id = s->hw_id; + bool enable = (mode == THERMAL_DEVICE_ENABLED); + unsigned long flags; + + if (tsens_version(priv) < VER_0_1) { + /* Pre v0.1 IP had a single register for each type of interrupt + * and threshold, so we can't support individual enable/disable. + */ + hw_id = 0; + enable = true; + } + + spin_lock_irqsave(&priv->ul_lock, flags); + + /* During sensor registration, thermal core calls change_mode(ENABLED) + * before it calls set_trips(low, high). To avoid enabling threshold + * interrupts before thresholds are configured, let's let set_trips do + * the first enable. + */ + if (s->trips_configured) { + tsens_set_interrupt(priv, hw_id, LOWER, enable); + tsens_set_interrupt(priv, hw_id, UPPER, enable); + } + s->enable_irqs = enable; + + spin_unlock_irqrestore(&priv->ul_lock, flags); + + return 0; +} + static int tsens_enable_irq(struct tsens_priv *priv) { int ret; @@ -1002,6 +1040,7 @@ static const struct thermal_zone_of_device_ops tsens_of_ops = { .get_temp = tsens_get_temp, .get_trend = tsens_get_trend, .set_trips = tsens_set_trips, + .change_mode = tsens_change_mode, }; static int tsens_register_irq(struct tsens_priv *priv, char *irqname, diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h index 1471a2c00f15..1a835d7688e0 100644 --- a/drivers/thermal/qcom/tsens.h +++ b/drivers/thermal/qcom/tsens.h @@ -45,6 +45,8 @@ enum tsens_irq_type { * @offset: offset of temperature adjustment curve * @hw_id: HW ID can be used in case of platform-specific IDs * @slope: slope of temperature adjustment curve + * @trips_configured: whether this sensor's upper/lower thresholds are set + * @enable_irqs: whether this sensor's threshold IRQs should be enabled * @status: 8960-specific variable to track 8960 and 8660 status register offset */ struct tsens_sensor { @@ -53,6 +55,8 @@ struct tsens_sensor { int offset; unsigned int hw_id; int slope; + bool trips_configured; + bool enable_irqs; u32 status; };