From patchwork Fri Jan 10 17:49:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 11328177 X-Patchwork-Delegate: cw00.choi@samsung.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E4C09930 for ; Fri, 10 Jan 2020 17:49:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C36A0206ED for ; Fri, 10 Jan 2020 17:49:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="WwNfzBmv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727834AbgAJRt0 (ORCPT ); Fri, 10 Jan 2020 12:49:26 -0500 Received: from mail-pl1-f195.google.com ([209.85.214.195]:37509 "EHLO mail-pl1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727405AbgAJRtZ (ORCPT ); Fri, 10 Jan 2020 12:49:25 -0500 Received: by mail-pl1-f195.google.com with SMTP id c23so1120333plz.4 for ; Fri, 10 Jan 2020 09:49:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=DfYJy9R3cN1g1cl3Z2QjlyF1rhKAw3VaBUq5ODQS3kM=; b=WwNfzBmvT9dFIfcQGzf4IrMgK5HDEAz4hlD9fsRCVa/yhu8hCCvdWBH6mWgr8t6427 8xwW8+0bU+6Ukap/xHuqxW8PLx7LFxF1J+Xen8noDMvr+jEawAnnFLjm8aYjHtekWTVM f2HhPtDdawhlf1air4fv6rygDcuPQnDWRfCzo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=DfYJy9R3cN1g1cl3Z2QjlyF1rhKAw3VaBUq5ODQS3kM=; b=MaFBveMaQKK3G4EXQ6/c4gG4yvalM0YW+hRAvdJuufKVI9wpHT541WaEQydkxlIVhD quVTAR8vZ/RAmaQmLEDMr17DvqqcRz8Qas0jIbpfXy3vOJ7HHE/pKDQwLQ0CTnD+OgIe GSDwfrRqaR02MtlI8XzClh/bjzbAFubB2fQ6xcqy99oMVjpsPXTI0qBorAmhwASyRALW yn9HKdN53MF6Z0GiSyMIgXiLuSV6gqCaUaKTf5EbBSEa68GLXOFDpKAr5bpMJU7TKexf UT0AFsFGPePNGvwMDp+deMd4QHU1Z3S6jhvURgPLCmcM84o0u1aCGUZGelQ8LbvkoZSw 0xRw== X-Gm-Message-State: APjAAAV+iWgk5xSW3RXLHYSjRsz1nPCWxAn/AgWcKSNLCYa8MGNhBpk0 nvjFq0u3Br5IZezV0lWo0z72ESFZKfg= X-Google-Smtp-Source: APXvYqyZtuhKFcYp6Lr/tH6mKtCyycxBtpGzWPFU7a6zD32Vu8rJ0s7UH+QhNLlj1aLi2riDdJFh2Q== X-Received: by 2002:a17:902:9a8f:: with SMTP id w15mr5654804plp.149.1578678565058; Fri, 10 Jan 2020 09:49:25 -0800 (PST) Received: from localhost ([2620:15c:202:1:4fff:7a6b:a335:8fde]) by smtp.gmail.com with ESMTPSA id 83sm3486093pgh.12.2020.01.10.09.49.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Jan 2020 09:49:24 -0800 (PST) From: Matthias Kaehlcke To: MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Zhang Rui , Daniel Lezcano , Amit Kucheria Cc: Leonard Crestez , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Matthias Kaehlcke Subject: [PATCH 1/2] thermal: devfreq_cooling: Use PM QoS to set frequency limits Date: Fri, 10 Jan 2020 09:49:18 -0800 Message-Id: <20200110094913.1.I146403d05b9ec82f48b807efd416a57f545b447a@changeid> X-Mailer: git-send-email 2.25.0.rc1.283.g88dfdc4193-goog MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Now that devfreq supports limiting the frequency range of a device through PM QoS make use of it instead of disabling OPPs that should not be used. Signed-off-by: Matthias Kaehlcke --- drivers/thermal/devfreq_cooling.c | 66 ++++++++++--------------------- 1 file changed, 20 insertions(+), 46 deletions(-) diff --git a/drivers/thermal/devfreq_cooling.c b/drivers/thermal/devfreq_cooling.c index ef59256887ff..3a63603afcf2 100644 --- a/drivers/thermal/devfreq_cooling.c +++ b/drivers/thermal/devfreq_cooling.c @@ -24,11 +24,13 @@ #include #include #include +#include #include #include -#define SCALE_ERROR_MITIGATION 100 +#define HZ_PER_KHZ 1000 +#define SCALE_ERROR_MITIGATION 100 static DEFINE_IDA(devfreq_ida); @@ -65,49 +67,9 @@ struct devfreq_cooling_device { struct devfreq_cooling_power *power_ops; u32 res_util; int capped_state; + struct dev_pm_qos_request req_max_freq; }; -/** - * partition_enable_opps() - disable all opps above a given state - * @dfc: Pointer to devfreq we are operating on - * @cdev_state: cooling device state we're setting - * - * Go through the OPPs of the device, enabling all OPPs until - * @cdev_state and disabling those frequencies above it. - */ -static int partition_enable_opps(struct devfreq_cooling_device *dfc, - unsigned long cdev_state) -{ - int i; - struct device *dev = dfc->devfreq->dev.parent; - - for (i = 0; i < dfc->freq_table_size; i++) { - struct dev_pm_opp *opp; - int ret = 0; - unsigned int freq = dfc->freq_table[i]; - bool want_enable = i >= cdev_state ? true : false; - - opp = dev_pm_opp_find_freq_exact(dev, freq, !want_enable); - - if (PTR_ERR(opp) == -ERANGE) - continue; - else if (IS_ERR(opp)) - return PTR_ERR(opp); - - dev_pm_opp_put(opp); - - if (want_enable) - ret = dev_pm_opp_enable(dev, freq); - else - ret = dev_pm_opp_disable(dev, freq); - - if (ret) - return ret; - } - - return 0; -} - static int devfreq_cooling_get_max_state(struct thermal_cooling_device *cdev, unsigned long *state) { @@ -134,7 +96,7 @@ static int devfreq_cooling_set_cur_state(struct thermal_cooling_device *cdev, struct devfreq_cooling_device *dfc = cdev->devdata; struct devfreq *df = dfc->devfreq; struct device *dev = df->dev.parent; - int ret; + unsigned long freq; if (state == dfc->cooling_state) return 0; @@ -144,9 +106,10 @@ static int devfreq_cooling_set_cur_state(struct thermal_cooling_device *cdev, if (state >= dfc->freq_table_size) return -EINVAL; - ret = partition_enable_opps(dfc, state); - if (ret) - return ret; + freq = dfc->freq_table[state]; + + dev_pm_qos_update_request(&dfc->req_max_freq, + DIV_ROUND_UP(freq, HZ_PER_KHZ)); dfc->cooling_state = state; @@ -529,6 +492,12 @@ of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df, if (err) goto free_dfc; + err = dev_pm_qos_add_request(df->dev.parent, &dfc->req_max_freq, + DEV_PM_QOS_MAX_FREQUENCY, + PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE); + if (err < 0) + goto remove_qos_req; + err = ida_simple_get(&devfreq_ida, 0, 0, GFP_KERNEL); if (err < 0) goto free_tables; @@ -552,6 +521,10 @@ of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df, release_ida: ida_simple_remove(&devfreq_ida, dfc->id); + +remove_qos_req: + dev_pm_qos_remove_request(&dfc->req_max_freq); + free_tables: kfree(dfc->power_table); kfree(dfc->freq_table); @@ -600,6 +573,7 @@ void devfreq_cooling_unregister(struct thermal_cooling_device *cdev) thermal_cooling_device_unregister(dfc->cdev); ida_simple_remove(&devfreq_ida, dfc->id); + dev_pm_qos_remove_request(&dfc->req_max_freq); kfree(dfc->power_table); kfree(dfc->freq_table);