From patchwork Wed Aug 10 03:26:43 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: huang lin X-Patchwork-Id: 9272611 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B67C660231 for ; Wed, 10 Aug 2016 03:30:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9805127CFC for ; Wed, 10 Aug 2016 03:30:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8A7E02840C; Wed, 10 Aug 2016 03:30:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 8EDF627CFC for ; Wed, 10 Aug 2016 03:30:12 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bXKDb-0000Wk-7n; Wed, 10 Aug 2016 03:30:11 +0000 Received: from mail-pa0-f68.google.com ([209.85.220.68]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bXKAn-0006Xh-Vu; Wed, 10 Aug 2016 03:27:24 +0000 Received: by mail-pa0-f68.google.com with SMTP id ez1so2001912pab.3; Tue, 09 Aug 2016 20:26:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=2U32UHAjLnjhA7Nb+aQNu/Q8XkoKON7j8cVRoLNwTWI=; b=jPEvo+Driqz2hKGdkbbO+C9smSAjGTZ3jri63fJF8jvk9QmHYVmHNv9XkOvYJG3sgB 7yKGkN/UiGGt7w5yhVq4MRga79803Yjj88KbIcR7FgpofLb7XQWepL1/L0JORXu1OLRp p9KJn6vQdzJWwNAjVv3m/YFQrNdYLdLuFTDrVgt2mG5kt1W6MKGsfP5392KBY+IQgxIK FDKz33lMIG1OEsD+SjnsaN0/vEPp3g2gKvzCL08IYRIPoq7ti4EKqieW+FuG6juwhvRE s9zTNFvqUGIxhtoTu4imOSbHlQe/UgR6VZqh6J/xq5e2QDKuaaXArdTF9VuEvHuw43p5 ONxQ== X-Gm-Message-State: AEkoouvp4FZRC/lSiZdnqYHLXGadktwppWrvxVw8rmm/y1f/8DO2iH23zeMlN5UyFlWlbg== X-Received: by 10.66.253.101 with SMTP id zz5mr3159306pac.32.1470799616950; Tue, 09 Aug 2016 20:26:56 -0700 (PDT) Received: from hl-ThinkPad-X240.corp.google.com ([172.22.52.196]) by smtp.gmail.com with ESMTPSA id z10sm59187701pff.95.2016.08.09.20.26.55 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 09 Aug 2016 20:26:56 -0700 (PDT) From: Lin Huang To: heiko@sntech.de Subject: [PATCH v5 7/8] PM / devfreq: rockchip: add devfreq driver for rk3399 dmc Date: Wed, 10 Aug 2016 11:26:43 +0800 Message-Id: <1470799604-12877-8-git-send-email-hl@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1470799604-12877-1-git-send-email-hl@rock-chips.com> References: <1470799604-12877-1-git-send-email-hl@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160809_202718_406190_95E7E55E X-CRM114-Status: GOOD ( 22.20 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tixy@linaro.org, mark.rutland@arm.com, typ@rock-chips.com, Lin Huang , linux-rockchip@lists.infradead.org, airlied@linux.ie, mturquette@baylibre.com, dbasehore@chromium.org, sboyd@codeaurora.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, dianders@chromium.org, cw00.choi@samsung.com, kyungmin.park@samsung.com, myungjoo.ham@samsung.com, sudeep.holla@arm.com, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, mark.yao@rock-chips.com MIME-Version: 1.0 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+patchwork-linux-rockchip=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP base on dfi result, we do ddr frequency scaling, register dmc driver to devfreq framework, and use simple-ondemand policy. Signed-off-by: Lin Huang Reviewed-by: Chanwoo Choi --- Changes in v5: - improve dmc driver suggest by Chanwoo Choi Changes in v4: - use arm_smccc_smc() function talk to bl31 - delete rockchip_dmc.c file and config - delete dmc_notify - adjust probe order Changes in v3: - operate dram setting through sip call - imporve set rate flow Changes in v2: - None Changes in v1: - move dfi controller to event - fix set voltage sequence when set rate fail - change Kconfig type from tristate to bool - move unuse EXPORT_SYMBOL_GPL() drivers/devfreq/Kconfig | 9 + drivers/devfreq/Makefile | 1 + drivers/devfreq/rk3399_dmc.c | 512 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 522 insertions(+) create mode 100644 drivers/devfreq/rk3399_dmc.c diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig index a5be56e..749499d 100644 --- a/drivers/devfreq/Kconfig +++ b/drivers/devfreq/Kconfig @@ -100,6 +100,15 @@ config ARM_TEGRA_DEVFREQ It reads ACTMON counters of memory controllers and adjusts the operating frequencies and voltages with OPP support. +config ARM_RK3399_DMC_DEVFREQ + tristate "ARM RK3399 DMC DEVFREQ Driver" + select PM_OPP + select DEVFREQ_GOV_SIMPLE_ONDEMAND + help + This adds the DEVFREQ driver for the RK3399 dmc(Dynamic Memory Controller). + It sets the frequency for the memory controller and reads the usage counts + from hardware. + source "drivers/devfreq/event/Kconfig" endif # PM_DEVFREQ diff --git a/drivers/devfreq/Makefile b/drivers/devfreq/Makefile index 09f11d9..70d9549 100644 --- a/drivers/devfreq/Makefile +++ b/drivers/devfreq/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_DEVFREQ_GOV_PASSIVE) += governor_passive.o # DEVFREQ Drivers obj-$(CONFIG_ARM_EXYNOS_BUS_DEVFREQ) += exynos-bus.o obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra-devfreq.o +obj-$(CONFIG_ARM_RK3399_DMC_DEVFREQ) += rk3399_dmc.o # DEVFREQ Event Drivers obj-$(CONFIG_PM_DEVFREQ_EVENT) += event/ diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c new file mode 100644 index 0000000..c1157ba --- /dev/null +++ b/drivers/devfreq/rk3399_dmc.c @@ -0,0 +1,512 @@ +/* + * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd. + * Author: Lin Huang + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +struct dram_timing { + unsigned int ddr3_speed_bin; + unsigned int pd_idle; + unsigned int sr_idle; + unsigned int sr_mc_gate_idle; + unsigned int srpd_lite_idle; + unsigned int standby_idle; + unsigned int dram_dll_dis_freq; + unsigned int phy_dll_dis_freq; + unsigned int ddr3_odt_dis_freq; + unsigned int ddr3_drv; + unsigned int ddr3_odt; + unsigned int phy_ddr3_ca_drv; + unsigned int phy_ddr3_dq_drv; + unsigned int phy_ddr3_odt; + unsigned int lpddr3_odt_dis_freq; + unsigned int lpddr3_drv; + unsigned int lpddr3_odt; + unsigned int phy_lpddr3_ca_drv; + unsigned int phy_lpddr3_dq_drv; + unsigned int phy_lpddr3_odt; + unsigned int lpddr4_odt_dis_freq; + unsigned int lpddr4_drv; + unsigned int lpddr4_dq_odt; + unsigned int lpddr4_ca_odt; + unsigned int phy_lpddr4_ca_drv; + unsigned int phy_lpddr4_ck_cs_drv; + unsigned int phy_lpddr4_dq_drv; + unsigned int phy_lpddr4_odt; +}; + +struct rk3399_dmcfreq { + struct device *dev; + struct devfreq *devfreq; + struct devfreq_simple_ondemand_data ondemand_data; + struct clk *dmc_clk; + struct devfreq_event_dev *edev; + struct mutex lock; + struct dram_timing *timing; + + /* + * DDR Converser of Frequency (DCF) is used to implement DDR frequency + * conversion without the participation of CPU, we will implement and + * control it in arm trust firmware. + */ + wait_queue_head_t wait_dcf_queue; + int irq; + int wait_dcf_flag; + struct regulator *vdd_center; + unsigned long rate, target_rate; + unsigned long volt, target_volt; + struct dev_pm_opp *curr_opp; +}; + +static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq, + u32 flags) +{ + struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev); + struct dev_pm_opp *opp; + unsigned long old_clk_rate = dmcfreq->rate; + unsigned long target_volt, target_rate; + int err; + + rcu_read_lock(); + opp = devfreq_recommended_opp(dev, freq, flags); + if (IS_ERR(opp)) { + rcu_read_unlock(); + return PTR_ERR(opp); + } + + target_rate = dev_pm_opp_get_freq(opp); + target_volt = dev_pm_opp_get_voltage(opp); + + dmcfreq->rate = dev_pm_opp_get_freq(dmcfreq->curr_opp); + dmcfreq->volt = dev_pm_opp_get_voltage(dmcfreq->curr_opp); + + rcu_read_unlock(); + + if (dmcfreq->rate == target_rate) + return 0; + + mutex_lock(&dmcfreq->lock); + + /* + * If frequency scaling from low to high, adjust voltage first. + * If frequency scaling from high to low, adjust frequency first. + */ + if (old_clk_rate < target_rate) { + err = regulator_set_voltage(dmcfreq->vdd_center, target_volt, + target_volt); + if (err) { + dev_err(dev, "Cannot to set voltage %lu uV\n", + target_volt); + goto out; + } + } + dmcfreq->wait_dcf_flag = 1; + + err = clk_set_rate(dmcfreq->dmc_clk, target_rate); + if (err) { + dev_err(dev, "Cannot to set frequency %lu (%d)\n", + target_rate, err); + regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt, + dmcfreq->volt); + goto out; + } + + /* + * Wait until bcf irq happen, it means freq scaling finish in + * arm trust firmware, use 100ms as timeout time. + */ + if (!wait_event_timeout(dmcfreq->wait_dcf_queue, + !dmcfreq->wait_dcf_flag, HZ / 10)) + dev_warn(dev, "Timeout waiting for dcf interrupt\n"); + + /* + * Check the dpll rate, + * There only two result we will get, + * 1. Ddr frequency scaling fail, we still get the old rate. + * 2. Ddr frequency scaling sucessful, we get the rate we set. + */ + dmcfreq->rate = clk_get_rate(dmcfreq->dmc_clk); + + /* If get the incorrect rate, set voltage to old value. */ + if (dmcfreq->rate != target_rate) { + dev_err(dev, "Get wrong ddr frequency, Request frequency %lu,\ + Current frequency %lu\n", target_rate, dmcfreq->rate); + regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt, + dmcfreq->volt); + goto out; + } else if (old_clk_rate > target_rate) + err = regulator_set_voltage(dmcfreq->vdd_center, target_volt, + target_volt); + if (err) + dev_err(dev, "Cannot to set vol %lu uV\n", target_volt); + + dmcfreq->curr_opp = opp; +out: + mutex_unlock(&dmcfreq->lock); + return err; +} + +static int rk3399_dmcfreq_get_dev_status(struct device *dev, + struct devfreq_dev_status *stat) +{ + struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev); + struct devfreq_event_data edata; + int ret = 0; + + ret = devfreq_event_get_event(dmcfreq->edev, &edata); + if (ret < 0) + return ret; + + stat->current_frequency = dmcfreq->rate; + stat->busy_time = edata.load_count; + stat->total_time = edata.total_count; + + return ret; +} + +static int rk3399_dmcfreq_get_cur_freq(struct device *dev, unsigned long *freq) +{ + struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev); + + *freq = dmcfreq->rate; + + return 0; +} + +static void rk3399_dmcfreq_exit(struct device *dev) +{ + struct platform_device *pdev = container_of(dev, + struct platform_device, + dev); + struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev); + + devfreq_unregister_opp_notifier(dev, dmcfreq->devfreq); +} + +static struct devfreq_dev_profile rk3399_devfreq_dmc_profile = { + .polling_ms = 200, + .target = rk3399_dmcfreq_target, + .get_dev_status = rk3399_dmcfreq_get_dev_status, + .get_cur_freq = rk3399_dmcfreq_get_cur_freq, + .exit = rk3399_dmcfreq_exit, +}; + +static __maybe_unused int rk3399_dmcfreq_suspend(struct device *dev) +{ + struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev); + int ret = 0; + + ret = devfreq_event_disable_edev(dmcfreq->edev); + if (ret < 0) { + dev_err(dev, "failed to disable the devfreq-event devices\n"); + return ret; + } + + ret = devfreq_suspend_device(dmcfreq->devfreq); + if (ret < 0) { + dev_err(dev, "failed to suspend the devfreq devices\n"); + return ret; + } + + return 0; +} + +static __maybe_unused int rk3399_dmcfreq_resume(struct device *dev) +{ + struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev); + int ret = 0; + + ret = devfreq_event_enable_edev(dmcfreq->edev); + if (ret < 0) { + dev_err(dev, "failed to enable the devfreq-event devices\n"); + return ret; + } + + ret = devfreq_resume_device(dmcfreq->devfreq); + if (ret < 0) { + dev_err(dev, "failed to resume the devfreq devices\n"); + return ret; + } + return ret; +} + +static SIMPLE_DEV_PM_OPS(rk3399_dmcfreq_pm, rk3399_dmcfreq_suspend, + rk3399_dmcfreq_resume); + +static irqreturn_t rk3399_dmc_irq(int irq, void *dev_id) +{ + struct rk3399_dmcfreq *dmcfreq = dev_id; + struct arm_smccc_res res; + + dmcfreq->wait_dcf_flag = 0; + wake_up(&dmcfreq->wait_dcf_queue); + + /* Clear the DCF interrupt */ + arm_smccc_smc(SIP_DDR_FREQ, 0, 0, CONFIG_DRAM_CLR_IRQ, + 0, 0, 0, 0, &res); + + return IRQ_HANDLED; +} + +static struct dram_timing *of_get_ddr_timings(struct device *dev, + struct device_node *np) +{ + struct dram_timing *timing = NULL; + struct device_node *np_tim; + int ret; + + np_tim = of_parse_phandle(np, "ddr_timing", 0); + if (np_tim) { + timing = devm_kzalloc(dev, sizeof(*timing), GFP_KERNEL); + if (!timing) + goto err; + + ret = of_property_read_u32(np_tim, "ddr3_speed_bin", + &timing->ddr3_speed_bin); + ret |= of_property_read_u32(np_tim, "pd_idle", + &timing->pd_idle); + ret |= of_property_read_u32(np_tim, "sr_idle", + &timing->sr_idle); + ret |= of_property_read_u32(np_tim, "sr_mc_gate_idle", + &timing->sr_mc_gate_idle); + ret |= of_property_read_u32(np_tim, "srpd_lite_idle", + &timing->srpd_lite_idle); + ret |= of_property_read_u32(np_tim, "standby_idle", + &timing->standby_idle); + ret |= of_property_read_u32(np_tim, "dram_dll_dis_freq", + &timing->dram_dll_dis_freq); + ret |= of_property_read_u32(np_tim, "phy_dll_dis_freq", + &timing->phy_dll_dis_freq); + ret |= of_property_read_u32(np_tim, "ddr3_odt_dis_freq", + &timing->ddr3_odt_dis_freq); + ret |= of_property_read_u32(np_tim, "ddr3_drv", + &timing->ddr3_drv); + ret |= of_property_read_u32(np_tim, "ddr3_odt", + &timing->ddr3_odt); + ret |= of_property_read_u32(np_tim, "phy_ddr3_ca_drv", + &timing->phy_ddr3_ca_drv); + ret |= of_property_read_u32(np_tim, "phy_ddr3_dq_drv", + &timing->phy_ddr3_dq_drv); + ret |= of_property_read_u32(np_tim, "phy_ddr3_odt", + &timing->phy_ddr3_odt); + ret |= of_property_read_u32(np_tim, "lpddr3_odt_dis_freq", + &timing->lpddr3_odt_dis_freq); + ret |= of_property_read_u32(np_tim, "lpddr3_drv", + &timing->lpddr3_drv); + ret |= of_property_read_u32(np_tim, "lpddr3_odt", + &timing->lpddr3_odt); + ret |= of_property_read_u32(np_tim, "phy_lpddr3_ca_drv", + &timing->phy_lpddr3_ca_drv); + ret |= of_property_read_u32(np_tim, "phy_lpddr3_dq_drv", + &timing->phy_lpddr3_dq_drv); + ret |= of_property_read_u32(np_tim, "phy_lpddr3_odt", + &timing->phy_lpddr3_odt); + ret |= of_property_read_u32(np_tim, "lpddr4_odt_dis_freq", + &timing->lpddr4_odt_dis_freq); + ret |= of_property_read_u32(np_tim, "lpddr4_drv", + &timing->lpddr4_drv); + ret |= of_property_read_u32(np_tim, "lpddr4_dq_odt", + &timing->lpddr4_dq_odt); + ret |= of_property_read_u32(np_tim, "lpddr4_ca_odt", + &timing->lpddr4_ca_odt); + ret |= of_property_read_u32(np_tim, "phy_lpddr4_ca_drv", + &timing->phy_lpddr4_ca_drv); + ret |= of_property_read_u32(np_tim, "phy_lpddr4_ck_cs_drv", + &timing->phy_lpddr4_ck_cs_drv); + ret |= of_property_read_u32(np_tim, "phy_lpddr4_dq_drv", + &timing->phy_lpddr4_dq_drv); + ret |= of_property_read_u32(np_tim, "phy_lpddr4_odt", + &timing->phy_lpddr4_odt); + if (ret) { + devm_kfree(dev, timing); + goto err; + } + of_node_put(np_tim); + return timing; + } + +err: + if (timing) { + devm_kfree(dev, timing); + timing = NULL; + } + of_node_put(np_tim); + return timing; +} + +static int rk3399_dmcfreq_probe(struct platform_device *pdev) +{ + struct arm_smccc_res res; + struct device *dev = &pdev->dev; + struct device_node *np = pdev->dev.of_node; + uint64_t param = 0; + struct rk3399_dmcfreq *data; + int ret, irq, index, size; + uint32_t *timing; + struct dev_pm_opp *opp; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "Cannot get the dmc interrupt resource\n"); + return -EINVAL; + } + data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL); + if (!data) + return -ENOMEM; + + mutex_init(&data->lock); + + data->vdd_center = devm_regulator_get(dev, "center"); + if (IS_ERR(data->vdd_center)) { + dev_err(dev, "Cannot get the regulator \"center\"\n"); + return PTR_ERR(data->vdd_center); + } + + data->dmc_clk = devm_clk_get(dev, "dmc_clk"); + if (IS_ERR(data->dmc_clk)) { + dev_err(dev, "Cannot get the clk dmc_clk\n"); + return PTR_ERR(data->dmc_clk); + }; + + data->irq = irq; + ret = devm_request_irq(dev, irq, rk3399_dmc_irq, 0, + dev_name(dev), data); + if (ret) { + dev_err(dev, "Failed to request dmc irq: %d\n", ret); + return ret; + } + + /* + * Get dram timing and pass it to arm trust firmware, + * the dram drvier in arm trust firmware will get these + * timing and to do dram initial. + */ + data->timing = of_get_ddr_timings(dev, np); + if (data->timing) { + timing = (uint32_t *)data->timing; + size = sizeof(struct dram_timing) / 4; + for (index = 0; index < size; index++) { + param = index; + param = param << 32 | *timing++; + arm_smccc_smc(SIP_DDR_FREQ, param, 0, + CONFIG_DRAM_SET_PARAM, 0, 0, 0, 0, &res); + if (res.a0) { + dev_err(dev, "Failed to set dram param: %ld\n", + res.a0); + return -EINVAL; + } + param = 0; + } + } + + arm_smccc_smc(SIP_DDR_FREQ, 0, 0, CONFIG_DRAM_INIT, + 0, 0, 0, 0, &res); + + init_waitqueue_head(&data->wait_dcf_queue); + data->wait_dcf_flag = 0; + + data->edev = devfreq_event_get_edev_by_phandle(dev, 0); + if (IS_ERR(data->edev)) + return -EPROBE_DEFER; + + ret = devfreq_event_enable_edev(data->edev); + if (ret < 0) { + dev_err(dev, "failed to enable devfreq-event devices\n"); + return ret; + } + + /* + * We add a devfreq driver to our parent since it has a device tree node + * with operating points. + */ + if (dev_pm_opp_of_add_table(dev)) { + dev_err(dev, "Invalid operating-points in device tree.\n"); + rcu_read_unlock(); + return -EINVAL; + } + + of_property_read_u32(np, "upthreshold", + &data->ondemand_data.upthreshold); + of_property_read_u32(np, "downdifferential", + &data->ondemand_data.downdifferential); + + data->rate = clk_get_rate(data->dmc_clk); + + rcu_read_lock(); + opp = devfreq_recommended_opp(dev, &data->rate, 0); + if (IS_ERR(opp)) { + rcu_read_unlock(); + return PTR_ERR(opp); + } + rcu_read_unlock(); + data->curr_opp = opp; + + rk3399_devfreq_dmc_profile.initial_freq = data->rate; + + data->devfreq = devfreq_add_device(dev, + &rk3399_devfreq_dmc_profile, + "simple_ondemand", + &data->ondemand_data); + if (IS_ERR(data->devfreq)) + return PTR_ERR(data->devfreq); + devfreq_register_opp_notifier(dev, data->devfreq); + + data->dev = dev; + platform_set_drvdata(pdev, data); + + return 0; +} + +static int rk3399_dmcfreq_remove(struct platform_device *pdev) +{ + struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev); + + devfreq_remove_device(dmcfreq->devfreq); + regulator_put(dmcfreq->vdd_center); + + return 0; +} + +static const struct of_device_id rk3399dmc_devfreq_of_match[] = { + { .compatible = "rockchip,rk3399-dmc" }, + { }, +}; + +static struct platform_driver rk3399_dmcfreq_driver = { + .probe = rk3399_dmcfreq_probe, + .remove = rk3399_dmcfreq_remove, + .driver = { + .name = "rk3399-dmc-freq", + .pm = &rk3399_dmcfreq_pm, + .of_match_table = rk3399dmc_devfreq_of_match, + }, +}; +module_platform_driver(rk3399_dmcfreq_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Lin Huang "); +MODULE_DESCRIPTION("RK3399 dmcfreq driver with devfreq framework");