From patchwork Fri May 20 13:19:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johnson Wang X-Patchwork-Id: 12856829 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 19F22C433EF for ; Fri, 20 May 2022 13:20:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=kjyERRb6/6YNvCTHbG3+kxmI+iW7b9Hjh+pI2nyKA1Y=; b=xF9zjCDmGeQPvn aqXqYog3HbyfVqMTPpxL9UR6qtFHiNlg/LOL+RA/fYR9aEW06Z0xHHPFoX8LhQASpDhHfqicOFZCz ugoBj31gJURJw9adFMUbRLDWHxCAqIsOuloAsm6rUewR+CfVjZbGxzxJlA2/JNlCEJ8yM4D3LQGgq KJFxJmSJnHExZwLJWWtrdGg7h8M5WIVTQcif8fBbaTVePExD4b5gr0cpF5KLKYsEYQ+lKfC2PJFvm ISPk7k5U6Mhe3ovf523mVMDSWGILWGV8rIsAJ8K1pSO0N6CrSN5HRIKsgXkH6vnI802hfT3GaqMfF wzPf28Mww/tt7XKmpR1w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ns2Yc-00Cb0R-TJ; Fri, 20 May 2022 13:20:42 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ns2Y7-00CaoJ-HS; Fri, 20 May 2022 13:20:15 +0000 X-UUID: 47840624cc854151a2ccc3fba7614018-20220520 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.5, REQID:1889b0eb-451e-411f-a95d-52ee2ba29a4f, OB:0, LO B:0,IP:0,URL:5,TC:0,Content:-5,EDM:0,RT:0,SF:0,FILE:0,RULE:Release_Ham,ACT ION:release,TS:0 X-CID-META: VersionHash:2a19b09, CLOUDID:7bdaf5e2-edbf-4bd4-8a34-dfc5f7bb086d, C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,IP:nil,URL:1,File:nil ,QS:0,BEC:nil X-UUID: 47840624cc854151a2ccc3fba7614018-20220520 Received: from mtkcas68.mediatek.inc [(172.29.94.19)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1489961208; Fri, 20 May 2022 06:20:01 -0700 Received: from mtkmbs10n2.mediatek.inc (172.21.101.183) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 20 May 2022 06:20:00 -0700 Received: from mtkmbs11n1.mediatek.inc (172.21.101.186) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.3; Fri, 20 May 2022 21:19:58 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.3 via Frontend Transport; Fri, 20 May 2022 21:19:58 +0800 From: Johnson Wang To: , , , CC: , , , , , , , , Johnson Wang Subject: [PATCH v5 2/2] PM / devfreq: mediatek: Introduce MediaTek CCI devfreq driver Date: Fri, 20 May 2022 21:19:56 +0800 Message-ID: <20220520131956.31150-3-johnson.wang@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20220520131956.31150-1-johnson.wang@mediatek.com> References: <20220520131956.31150-1-johnson.wang@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220520_062011_627902_E558BC04 X-CRM114-Status: GOOD ( 31.77 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org We introduce a devfreq driver for the MediaTek Cache Coherent Interconnect (CCI) used by some MediaTek SoCs. In this driver, we use the passive devfreq driver to get target frequencies and adjust voltages accordingly. In MT8183 and MT8186, the MediaTek CCI is supplied by the same regulators with the little core CPUs. Signed-off-by: Jia-Wei Chang Signed-off-by: Johnson Wang Acked-by: Chanwoo Choi --- This patch depends on "devfreq-testing"[1]. [1]https://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git/log/?h=devfreq-testing --- drivers/devfreq/Kconfig | 10 + drivers/devfreq/Makefile | 1 + drivers/devfreq/mtk-cci-devfreq.c | 447 ++++++++++++++++++++++++++++++ 3 files changed, 458 insertions(+) create mode 100644 drivers/devfreq/mtk-cci-devfreq.c diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig index 87eb2b837e68..9754d8b31621 100644 --- a/drivers/devfreq/Kconfig +++ b/drivers/devfreq/Kconfig @@ -120,6 +120,16 @@ config ARM_TEGRA_DEVFREQ It reads ACTMON counters of memory controllers and adjusts the operating frequencies and voltages with OPP support. +config ARM_MEDIATEK_CCI_DEVFREQ + tristate "MEDIATEK CCI DEVFREQ Driver" + depends on ARM_MEDIATEK_CPUFREQ || COMPILE_TEST + select DEVFREQ_GOV_PASSIVE + help + This adds a devfreq driver for MediaTek Cache Coherent Interconnect + which is shared the same regulators with the cpu cluster. It can track + buck voltages and update a proper CCI frequency. Use the notification + to get the regulator status. + config ARM_RK3399_DMC_DEVFREQ tristate "ARM RK3399 DMC DEVFREQ Driver" depends on (ARCH_ROCKCHIP && HAVE_ARM_SMCCC) || \ diff --git a/drivers/devfreq/Makefile b/drivers/devfreq/Makefile index 0b6be92a25d9..bf40d04928d0 100644 --- a/drivers/devfreq/Makefile +++ b/drivers/devfreq/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_DEVFREQ_GOV_PASSIVE) += governor_passive.o obj-$(CONFIG_ARM_EXYNOS_BUS_DEVFREQ) += exynos-bus.o obj-$(CONFIG_ARM_IMX_BUS_DEVFREQ) += imx-bus.o obj-$(CONFIG_ARM_IMX8M_DDRC_DEVFREQ) += imx8m-ddrc.o +obj-$(CONFIG_ARM_MEDIATEK_CCI_DEVFREQ) += mtk-cci-devfreq.o obj-$(CONFIG_ARM_RK3399_DMC_DEVFREQ) += rk3399_dmc.o obj-$(CONFIG_ARM_SUN8I_A33_MBUS_DEVFREQ) += sun8i-a33-mbus.o obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra30-devfreq.o diff --git a/drivers/devfreq/mtk-cci-devfreq.c b/drivers/devfreq/mtk-cci-devfreq.c new file mode 100644 index 000000000000..2eaff24fb487 --- /dev/null +++ b/drivers/devfreq/mtk-cci-devfreq.c @@ -0,0 +1,447 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2022 MediaTek Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct mtk_ccifreq_platform_data { + int min_volt_shift; + int max_volt_shift; + int proc_max_volt; + int sram_min_volt; + int sram_max_volt; +}; + +struct mtk_ccifreq_drv { + struct device *dev; + struct devfreq *devfreq; + struct regulator *proc_reg; + struct regulator *sram_reg; + struct clk *cci_clk; + struct clk *inter_clk; + int inter_voltage; + unsigned long pre_freq; + /* Avoid race condition for regulators between notify and policy */ + struct mutex reg_lock; + struct notifier_block opp_nb; + const struct mtk_ccifreq_platform_data *soc_data; + int vtrack_max; +}; + +static int mtk_ccifreq_set_voltage(struct mtk_ccifreq_drv *drv, int new_voltage) +{ + const struct mtk_ccifreq_platform_data *soc_data = drv->soc_data; + struct device *dev = drv->dev; + int pre_voltage, pre_vsram, new_vsram, vsram, voltage, ret; + int retry_max = drv->vtrack_max; + + if (!drv->sram_reg) { + ret = regulator_set_voltage(drv->proc_reg, new_voltage, + drv->soc_data->proc_max_volt); + return ret; + } + + pre_voltage = regulator_get_voltage(drv->proc_reg); + if (pre_voltage < 0) { + dev_err(dev, "invalid vproc value: %d\n", pre_voltage); + return pre_voltage; + } + + pre_vsram = regulator_get_voltage(drv->sram_reg); + if (pre_vsram < 0) { + dev_err(dev, "invalid vsram value: %d\n", pre_vsram); + return pre_vsram; + } + + new_vsram = clamp(new_voltage + soc_data->min_volt_shift, + soc_data->sram_min_volt, soc_data->sram_max_volt); + + do { + if (pre_voltage <= new_voltage) { + vsram = clamp(pre_voltage + soc_data->max_volt_shift, + soc_data->sram_min_volt, new_vsram); + ret = regulator_set_voltage(drv->sram_reg, vsram, + soc_data->sram_max_volt); + if (ret) + return ret; + + if (vsram == soc_data->sram_max_volt || + new_vsram == soc_data->sram_min_volt) + voltage = new_voltage; + else + voltage = vsram - soc_data->min_volt_shift; + + ret = regulator_set_voltage(drv->proc_reg, voltage, + soc_data->proc_max_volt); + if (ret) { + regulator_set_voltage(drv->sram_reg, pre_vsram, + soc_data->sram_max_volt); + return ret; + } + } else if (pre_voltage > new_voltage) { + voltage = max(new_voltage, + pre_vsram - soc_data->max_volt_shift); + ret = regulator_set_voltage(drv->proc_reg, voltage, + soc_data->proc_max_volt); + if (ret) + return ret; + + if (voltage == new_voltage) + vsram = new_vsram; + else + vsram = max(new_vsram, + voltage + soc_data->min_volt_shift); + + ret = regulator_set_voltage(drv->sram_reg, vsram, + soc_data->sram_max_volt); + if (ret) { + regulator_set_voltage(drv->proc_reg, pre_voltage, + soc_data->proc_max_volt); + return ret; + } + } + + pre_voltage = voltage; + pre_vsram = vsram; + + if (--retry_max < 0) { + dev_err(dev, + "over loop count, failed to set voltage\n"); + return -EINVAL; + } + } while (voltage != new_voltage || vsram != new_vsram); + + return ret; +} + +static int mtk_ccifreq_target(struct device *dev, unsigned long *freq, + u32 flags) +{ + struct mtk_ccifreq_drv *drv = dev_get_drvdata(dev); + struct clk *cci_pll = clk_get_parent(drv->cci_clk); + struct dev_pm_opp *opp; + unsigned long opp_rate; + int voltage, pre_voltage, inter_voltage, target_voltage, ret; + + if (!drv) + return -EINVAL; + + if (drv->pre_freq == *freq) + return 0; + + inter_voltage = drv->inter_voltage; + + opp_rate = *freq; + opp = devfreq_recommended_opp(dev, &opp_rate, 1); + if (IS_ERR(opp)) { + dev_err(dev, "failed to find opp for freq: %ld\n", opp_rate); + return PTR_ERR(opp); + } + + mutex_lock(&drv->reg_lock); + + voltage = dev_pm_opp_get_voltage(opp); + dev_pm_opp_put(opp); + + pre_voltage = regulator_get_voltage(drv->proc_reg); + if (pre_voltage < 0) { + dev_err(dev, "invalid vproc value: %d\n", pre_voltage); + ret = pre_voltage; + goto out_unlock; + } + + /* scale up: set voltage first then freq. */ + target_voltage = max(inter_voltage, voltage); + if (pre_voltage <= target_voltage) { + ret = mtk_ccifreq_set_voltage(drv, target_voltage); + if (ret) { + dev_err(dev, "failed to scale up voltage\n"); + goto out_restore_voltage; + } + } + + /* switch the cci clock to intermediate clock source. */ + ret = clk_set_parent(drv->cci_clk, drv->inter_clk); + if (ret) { + dev_err(dev, "failed to re-parent cci clock\n"); + goto out_restore_voltage; + } + + /* set the original clock to target rate. */ + ret = clk_set_rate(cci_pll, *freq); + if (ret) { + dev_err(dev, "failed to set cci pll rate: %d\n", ret); + clk_set_parent(drv->cci_clk, cci_pll); + goto out_restore_voltage; + } + + /* switch the cci clock back to the original clock source. */ + ret = clk_set_parent(drv->cci_clk, cci_pll); + if (ret) { + dev_err(dev, "failed to re-parent cci clock\n"); + mtk_ccifreq_set_voltage(drv, inter_voltage); + goto out_unlock; + } + + /* + * If the new voltage is lower than the intermediate voltage or the + * original voltage, scale down to the new voltage. + */ + if (voltage < inter_voltage || voltage < pre_voltage) { + ret = mtk_ccifreq_set_voltage(drv, voltage); + if (ret) { + dev_err(dev, "failed to scale down voltage\n"); + goto out_unlock; + } + } + + drv->pre_freq = *freq; + mutex_unlock(&drv->reg_lock); + + return 0; + +out_restore_voltage: + mtk_ccifreq_set_voltage(drv, pre_voltage); + +out_unlock: + mutex_unlock(&drv->reg_lock); + return ret; +} + +static int mtk_ccifreq_opp_notifier(struct notifier_block *nb, + unsigned long event, void *data) +{ + struct dev_pm_opp *opp = data; + struct mtk_ccifreq_drv *drv; + unsigned long freq, volt; + + drv = container_of(nb, struct mtk_ccifreq_drv, opp_nb); + + if (event == OPP_EVENT_ADJUST_VOLTAGE) { + freq = dev_pm_opp_get_freq(opp); + + mutex_lock(&drv->reg_lock); + /* current opp item is changed */ + if (freq == drv->pre_freq) { + volt = dev_pm_opp_get_voltage(opp); + mtk_ccifreq_set_voltage(drv, volt); + } + mutex_unlock(&drv->reg_lock); + } + + return 0; +} + +static struct devfreq_dev_profile mtk_ccifreq_profile = { + .target = mtk_ccifreq_target, +}; + +static int mtk_ccifreq_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mtk_ccifreq_drv *drv; + struct devfreq_passive_data *passive_data; + struct dev_pm_opp *opp; + unsigned long rate, opp_volt; + int ret; + + drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); + if (!drv) + return -ENOMEM; + + drv->dev = dev; + drv->soc_data = (const struct mtk_ccifreq_platform_data *) + of_device_get_match_data(&pdev->dev); + mutex_init(&drv->reg_lock); + platform_set_drvdata(pdev, drv); + + drv->cci_clk = devm_clk_get(dev, "cci"); + if (IS_ERR(drv->cci_clk)) { + ret = PTR_ERR(drv->cci_clk); + return dev_err_probe(dev, ret, + "failed to get cci clk: %d\n", ret); + } + + drv->inter_clk = devm_clk_get(dev, "intermediate"); + if (IS_ERR(drv->inter_clk)) { + ret = PTR_ERR(drv->inter_clk); + dev_err_probe(dev, ret, + "failed to get intermediate clk: %d\n", ret); + goto out_free_resources; + } + + drv->proc_reg = devm_regulator_get_optional(dev, "proc"); + if (IS_ERR(drv->proc_reg)) { + ret = PTR_ERR(drv->proc_reg); + dev_err_probe(dev, ret, + "failed to get proc regulator: %d\n", ret); + goto out_free_resources; + } + + ret = regulator_enable(drv->proc_reg); + if (ret) { + dev_err(dev, "failed to enable proc regulator\n"); + goto out_free_resources; + } + + drv->sram_reg = devm_regulator_get_optional(dev, "sram"); + if (IS_ERR(drv->sram_reg)) + drv->sram_reg = NULL; + else { + ret = regulator_enable(drv->sram_reg); + if (ret) { + dev_err(dev, "failed to enable sram regulator\n"); + goto out_free_resources; + } + } + + /* + * We assume min voltage is 0 and tracking target voltage using + * min_volt_shift for each iteration. + * The retry_max is 3 times of expected iteration count. + */ + drv->vtrack_max = 3 * DIV_ROUND_UP(max(drv->soc_data->sram_max_volt, + drv->soc_data->proc_max_volt), + drv->soc_data->min_volt_shift); + + ret = clk_prepare_enable(drv->cci_clk); + if (ret) + goto out_free_resources; + + ret = dev_pm_opp_of_add_table(dev); + if (ret) { + dev_err(dev, "failed to add opp table: %d\n", ret); + goto out_disable_cci_clk; + } + + rate = clk_get_rate(drv->inter_clk); + opp = dev_pm_opp_find_freq_ceil(dev, &rate); + if (IS_ERR(opp)) { + ret = PTR_ERR(opp); + dev_err(dev, "failed to get intermediate opp: %d\n", ret); + goto out_remove_opp_table; + } + drv->inter_voltage = dev_pm_opp_get_voltage(opp); + dev_pm_opp_put(opp); + + rate = U32_MAX; + opp = dev_pm_opp_find_freq_floor(drv->dev, &rate); + if (IS_ERR(opp)) { + dev_err(dev, "failed to get opp\n"); + ret = PTR_ERR(opp); + goto out_remove_opp_table; + } + + opp_volt = dev_pm_opp_get_voltage(opp); + dev_pm_opp_put(opp); + ret = mtk_ccifreq_set_voltage(drv, opp_volt); + if (ret) { + dev_err(dev, "failed to scale to highest voltage %lu in proc_reg\n", + opp_volt); + goto out_remove_opp_table; + } + + passive_data = devm_kzalloc(dev, sizeof(struct devfreq_passive_data), + GFP_KERNEL); + if (!passive_data) { + ret = -ENOMEM; + goto out_remove_opp_table; + } + + passive_data->parent_type = CPUFREQ_PARENT_DEV; + drv->devfreq = devm_devfreq_add_device(dev, &mtk_ccifreq_profile, + DEVFREQ_GOV_PASSIVE, + passive_data); + if (IS_ERR(drv->devfreq)) { + ret = -EPROBE_DEFER; + dev_err(dev, "failed to add devfreq device: %ld\n", + PTR_ERR(drv->devfreq)); + goto out_remove_opp_table; + } + + drv->opp_nb.notifier_call = mtk_ccifreq_opp_notifier; + ret = dev_pm_opp_register_notifier(dev, &drv->opp_nb); + if (ret) { + dev_err(dev, "failed to register opp notifier: %d\n", ret); + goto out_remove_devfreq_device; + } + return 0; + +out_remove_devfreq_device: + devm_devfreq_remove_device(dev, drv->devfreq); + +out_remove_opp_table: + dev_pm_opp_of_remove_table(dev); + +out_disable_cci_clk: + clk_disable_unprepare(drv->cci_clk); + +out_free_resources: + if (regulator_is_enabled(drv->proc_reg)) + regulator_disable(drv->proc_reg); + if (drv->sram_reg && regulator_is_enabled(drv->sram_reg)) + regulator_disable(drv->sram_reg); + + return ret; +} + +static int mtk_ccifreq_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mtk_ccifreq_drv *drv; + + drv = platform_get_drvdata(pdev); + + dev_pm_opp_unregister_notifier(dev, &drv->opp_nb); + dev_pm_opp_of_remove_table(dev); + clk_disable_unprepare(drv->cci_clk); + regulator_disable(drv->proc_reg); + if (drv->sram_reg) + regulator_disable(drv->sram_reg); + + return 0; +} + +static const struct mtk_ccifreq_platform_data mt8183_platform_data = { + .min_volt_shift = 100000, + .max_volt_shift = 200000, + .proc_max_volt = 1150000, +}; + +static const struct mtk_ccifreq_platform_data mt8186_platform_data = { + .min_volt_shift = 100000, + .max_volt_shift = 250000, + .proc_max_volt = 1118750, + .sram_min_volt = 850000, + .sram_max_volt = 1118750, +}; + +static const struct of_device_id mtk_ccifreq_machines[] = { + { .compatible = "mediatek,mt8183-cci", .data = &mt8183_platform_data }, + { .compatible = "mediatek,mt8186-cci", .data = &mt8186_platform_data }, + { }, +}; +MODULE_DEVICE_TABLE(of, mtk_ccifreq_machines); + +static struct platform_driver mtk_ccifreq_platdrv = { + .probe = mtk_ccifreq_probe, + .remove = mtk_ccifreq_remove, + .driver = { + .name = "mtk-ccifreq", + .of_match_table = mtk_ccifreq_machines, + }, +}; +module_platform_driver(mtk_ccifreq_platdrv); + +MODULE_DESCRIPTION("MediaTek CCI devfreq driver"); +MODULE_AUTHOR("Jia-Wei Chang "); +MODULE_LICENSE("GPL v2");