Hi Lin,
This patch include the two features as following: - Monitor the ddr load - Control the ddr's clock with ondemand governor based on load
The "Monitor the ddr load" has the specific the address in SoC. Namely, it is separate the module. So, I implemented the devfreq-event framework[1] which was merged.
It is right method to separate two feature from your device driver. You can refer to patch[2][3]. The patch[2] show how to implement the "monitor the ddr load" by using Devfreq-Event framework and the patch[3] include the method how to implement the rk3399 dmc driver.
[1] Devfreq-Event framework - https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f...
[2] Exynos Noc probe driver by using Devfreq-Event framework - https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0...
[3] Exynos Busfreq driver using the devfreq-evnet framework to get the monitored data - https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0...
If you have more information and help, please let me know. I'll help you.
Thanks, Chanwoo Choi
On Wed, Jun 1, 2016 at 6:35 PM, Lin Huang hl@rock-chips.com wrote:
there is dfi controller on rk3399 platform, it can monitor ddr load, register this controller to devfreq framework, and default to use simple_ondeamnd policy, and do ddr frequency scaling base on this result.
Signed-off-by: Lin Huang hl@rock-chips.com
drivers/devfreq/Kconfig | 2 +- drivers/devfreq/Makefile | 1 + drivers/devfreq/rockchip/Kconfig | 14 + drivers/devfreq/rockchip/Makefile | 2 + drivers/devfreq/rockchip/rk3399_dmc.c | 438 ++++++++++++++++++++++++++++++++ drivers/devfreq/rockchip/rockchip_dmc.c | 132 ++++++++++ include/soc/rockchip/rockchip_dmc.h | 44 ++++ 7 files changed, 632 insertions(+), 1 deletion(-) create mode 100644 drivers/devfreq/rockchip/Kconfig create mode 100644 drivers/devfreq/rockchip/Makefile create mode 100644 drivers/devfreq/rockchip/rk3399_dmc.c create mode 100644 drivers/devfreq/rockchip/rockchip_dmc.c create mode 100644 include/soc/rockchip/rockchip_dmc.h
diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig index 78dac0e..a883744 100644 --- a/drivers/devfreq/Kconfig +++ b/drivers/devfreq/Kconfig @@ -101,5 +101,5 @@ config ARM_TEGRA_DEVFREQ operating frequencies and voltages with OPP support.
source "drivers/devfreq/event/Kconfig"
+source "drivers/devfreq/rockchip/Kconfig" endif # PM_DEVFREQ diff --git a/drivers/devfreq/Makefile b/drivers/devfreq/Makefile index 09f11d9..48e2ae6 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_ARCH_ROCKCHIP) += rockchip/
# DEVFREQ Event Drivers obj-$(CONFIG_PM_DEVFREQ_EVENT) += event/ diff --git a/drivers/devfreq/rockchip/Kconfig b/drivers/devfreq/rockchip/Kconfig new file mode 100644 index 0000000..617b5fe --- /dev/null +++ b/drivers/devfreq/rockchip/Kconfig @@ -0,0 +1,14 @@ +config ARM_ROCKCHIP_DMC_DEVFREQ
tristate "ARM ROCKCHIP DMC DEVFREQ Driver"depends on ARCH_ROCKCHIPhelpThis adds the DEVFREQ driver framework for the rockchip dmc.+config ARM_RK3399_DMC_DEVFREQ
tristate "ARM RK3399 DMC DEVFREQ Driver"depends on ARM_ROCKCHIP_DMC_DEVFREQselect PM_OPPselect DEVFREQ_GOV_SIMPLE_ONDEMANDhelpThis adds the DEVFREQ driver for the RK3399 dmc. It sets the frequencyfor the memory controller and reads the usage counts from hardware.diff --git a/drivers/devfreq/rockchip/Makefile b/drivers/devfreq/rockchip/Makefile new file mode 100644 index 0000000..caca525 --- /dev/null +++ b/drivers/devfreq/rockchip/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_ARM_ROCKCHIP_DMC_DEVFREQ) += rockchip_dmc.o +obj-$(CONFIG_ARM_RK3399_DMC_DEVFREQ) += rk3399_dmc.o diff --git a/drivers/devfreq/rockchip/rk3399_dmc.c b/drivers/devfreq/rockchip/rk3399_dmc.c new file mode 100644 index 0000000..4907d38 --- /dev/null +++ b/drivers/devfreq/rockchip/rk3399_dmc.c @@ -0,0 +1,438 @@ +/*
- Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
- Author: Lin Huang hl@rock-chips.com
- 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 <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/devfreq.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/pm_opp.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/rwsem.h> +#include <linux/suspend.h> +#include <linux/syscore_ops.h>
+#include <soc/rockchip/rockchip_dmc.h>
+#define RK3399_DMC_NUM_CH 2
+/* DDRMON_CTRL */ +#define DDRMON_CTRL 0x04 +#define CLR_DDRMON_CTRL (0x1f0000 << 0) +#define LPDDR4_EN (0x10001 << 4) +#define HARDWARE_EN (0x10001 << 3) +#define LPDDR3_EN (0x10001 << 2) +#define SOFTWARE_EN (0x10001 << 1) +#define TIME_CNT_EN (0x10001 << 0)
+#define DDRMON_CH0_COUNT_NUM 0x28 +#define DDRMON_CH0_DFI_ACCESS_NUM 0x2c +#define DDRMON_CH1_COUNT_NUM 0x3c +#define DDRMON_CH1_DFI_ACCESS_NUM 0x40
+/* pmu grf */ +#define PMUGRF_OS_REG2 0x308 +#define DDRTYPE_SHIFT 13 +#define DDRTYPE_MASK 7
+enum {
DDR3 = 3,LPDDR3 = 6,LPDDR4 = 7,UNUSED = 0xFF+};
+struct dmc_usage {
u32 access;u32 total;+};
+struct rk3399_dmcfreq {
struct device *dev;struct devfreq *devfreq;struct devfreq_simple_ondemand_data ondemand_data;struct clk *dmc_clk;struct completion dcf_hold_completion;struct dmc_usage ch_usage[RK3399_DMC_NUM_CH];struct mutex lock;struct notifier_block dmc_nb;int irq;void __iomem *regs;struct regmap *regmap_pmu;struct regulator *vdd_center;unsigned long rate, target_rate;unsigned long volt, target_volt;+};
+static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
u32 flags)+{
struct platform_device *pdev = container_of(dev, struct platform_device,dev);struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev);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);opp = devfreq_recommended_opp(dev, &dmcfreq->rate, flags);if (IS_ERR(opp)) {rcu_read_unlock();return PTR_ERR(opp);}dmcfreq->volt = dev_pm_opp_get_voltage(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, adjuset frequency first;*/if (old_clk_rate < target_rate) {err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,target_volt);if (err) {dev_err(dev, "Unable to set vol %lu\n", target_volt);goto out;}}dmc_event(DMCFREQ_ADJUST);err = clk_set_rate(dmcfreq->dmc_clk, target_rate);if (err) {dev_err(dev,"Unable to set freq %lu. Current freq %lu. Error %d\n",target_rate, old_clk_rate, err);regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,dmcfreq->volt);dmc_event(DMCFREQ_FINISH);goto out;}/* wait until bcf irq happen, it means ddr scaling finish in bl31 */reinit_completion(&dmcfreq->dcf_hold_completion);wait_for_completion(&dmcfreq->dcf_hold_completion);dmc_event(DMCFREQ_FINISH);if (old_clk_rate > target_rate)err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,target_volt);if (err)dev_err(dev, "Unable to set vol %lu\n", target_volt);/* check the rate we get whether correct */dmcfreq->rate = clk_get_rate(dmcfreq->dmc_clk);if (dmcfreq->rate != target_rate) {dev_err(dev, "get wrong ddr frequency, Request freq %lu,\Current freq %lu\n", target_rate, dmcfreq->rate);regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,dmcfreq->volt);}+out:
mutex_unlock(&dmcfreq->lock);return err;+}
+static void rk3399_dmc_start_hardware_counter(struct device *dev) +{
struct platform_device *pdev = container_of(dev, struct platform_device,dev);struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev);void __iomem *dfi_regs = dmcfreq->regs;u32 val;u32 ddr_type;/* get ddr type */regmap_read(dmcfreq->regmap_pmu, PMUGRF_OS_REG2, &val);ddr_type = (val >> DDRTYPE_SHIFT) & DDRTYPE_MASK;/* clear DDRMON_CTRL setting */writel_relaxed(CLR_DDRMON_CTRL, dfi_regs + DDRMON_CTRL);/* set ddr type to dfi */if (ddr_type == LPDDR3)writel_relaxed(LPDDR3_EN, dfi_regs + DDRMON_CTRL);else if (ddr_type == LPDDR4)writel_relaxed(LPDDR4_EN, dfi_regs + DDRMON_CTRL);/* enable count, use software mode */writel_relaxed(SOFTWARE_EN, dfi_regs + DDRMON_CTRL);+}
+static void rk3399_dmc_stop_hardware_counter(struct device *dev) +{
struct platform_device *pdev = container_of(dev, struct platform_device,dev);struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev);void __iomem *dfi_regs = dmcfreq->regs;u32 val;val = readl_relaxed(dfi_regs + DDRMON_CTRL);val &= ~SOFTWARE_EN;writel_relaxed(val, dfi_regs + DDRMON_CTRL);+}
+static int rk3399_dmc_get_busier_ch(struct device *dev) +{
struct platform_device *pdev = container_of(dev, struct platform_device,dev);struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev);u32 tmp, max = 0;u32 i, busier_ch = 0;void __iomem *dfi_regs = dmcfreq->regs;rk3399_dmc_stop_hardware_counter(dev);/* Find out which channel is busier */for (i = 0; i < RK3399_DMC_NUM_CH; i++) {dmcfreq->ch_usage[i].access = readl_relaxed(dfi_regs +DDRMON_CH0_DFI_ACCESS_NUM + i * 20);dmcfreq->ch_usage[i].total = readl_relaxed(dfi_regs +DDRMON_CH0_COUNT_NUM + i * 20);tmp = dmcfreq->ch_usage[i].access;if (tmp > max) {busier_ch = i;max = tmp;}}rk3399_dmc_start_hardware_counter(dev);return busier_ch;+}
+static int rk3399_dmcfreq_get_dev_status(struct device *dev,
struct devfreq_dev_status *stat)+{
struct platform_device *pdev = container_of(dev, struct platform_device,dev);struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev);int busier_ch;busier_ch = rk3399_dmc_get_busier_ch(dev);stat->current_frequency = dmcfreq->rate;stat->busy_time = dmcfreq->ch_usage[busier_ch].access;stat->total_time = dmcfreq->ch_usage[busier_ch].total;return 0;+}
+static int rk3399_dmcfreq_get_cur_freq(struct device *dev, unsigned long *freq) +{
struct platform_device *pdev = container_of(dev, struct platform_device,dev);struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev);*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) +{
rockchip_dmc_disable();return 0;+}
+static __maybe_unused int rk3399_dmcfreq_resume(struct device *dev) +{
rockchip_dmc_enable();return 0;+}
+static SIMPLE_DEV_PM_OPS(rk3399_dmcfreq_pm, rk3399_dmcfreq_suspend,
rk3399_dmcfreq_resume);+static int rk3399_dmc_enable_notify(struct notifier_block *nb,
unsigned long event, void *data)+{
struct rk3399_dmcfreq *dmcfreq =container_of(nb, struct rk3399_dmcfreq, dmc_nb);unsigned long freq = ULONG_MAX;if (event == DMC_ENABLE) {devfreq_resume_device(dmcfreq->devfreq);rk3399_dmc_start_hardware_counter(dmcfreq->dev);return NOTIFY_OK;} else if (event == DMC_DISABLE) {devfreq_suspend_device(dmcfreq->devfreq);rk3399_dmc_stop_hardware_counter(dmcfreq->dev);/* when disable dmc, set sdram to max frequency */rk3399_dmcfreq_target(dmcfreq->dev, &freq, 0);return NOTIFY_OK;}return NOTIFY_DONE;+}
+static irqreturn_t rk3399_dmc_irq(int irq, void *dev_id) +{
struct rk3399_dmcfreq *dmcfreq = dev_id;complete(&dmcfreq->dcf_hold_completion);return IRQ_HANDLED;+}
+static int rk3399_dmcfreq_probe(struct platform_device *pdev) +{
struct device *dev = &pdev->dev;struct rk3399_dmcfreq *data;struct resource *res;int ret, irq;struct device_node *np = pdev->dev.of_node, *node;irq = platform_get_irq(pdev, 0);if (irq < 0) {dev_err(&pdev->dev, "no dmc irq resource\n");return -EINVAL;}data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL);if (!data)return -ENOMEM;mutex_init(&data->lock);res = platform_get_resource(pdev, IORESOURCE_MEM, 0);data->regs = devm_ioremap_resource(&pdev->dev, res);if (IS_ERR(data->regs))return PTR_ERR(data->regs);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);};/** 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");return -EINVAL;}of_property_read_u32(np, "upthreshold",&data->ondemand_data.upthreshold);of_property_read_u32(np, "downdifferential",&data->ondemand_data.downdifferential);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->dmc_nb.notifier_call = rk3399_dmc_enable_notify;dmc_register_notifier(&data->dmc_nb);data->irq = irq;ret = devm_request_irq(dev, irq, rk3399_dmc_irq, IRQF_ONESHOT,dev_name(dev), data);if (ret) {dev_err(dev, "failed to request dmc irq: %d\n", ret);return ret;}init_completion(&data->dcf_hold_completion);/* try to find the optional reference to the pmu syscon */node = of_parse_phandle(np, "rockchip,pmu", 0);if (node) {data->regmap_pmu = syscon_node_to_regmap(node);if (IS_ERR(data->regmap_pmu))return PTR_ERR(data->regmap_pmu);}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_DESCRIPTION("RK3399 dmcfreq driver with devfreq framework"); diff --git a/drivers/devfreq/rockchip/rockchip_dmc.c b/drivers/devfreq/rockchip/rockchip_dmc.c new file mode 100644 index 0000000..ecc6598 --- /dev/null +++ b/drivers/devfreq/rockchip/rockchip_dmc.c @@ -0,0 +1,132 @@ +/*
- Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
- Author: Lin Huang hl@rock-chips.com
- 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 <linux/mutex.h> +#include <soc/rockchip/rockchip_dmc.h>
+static int num_wait; +static int num_disable; +static BLOCKING_NOTIFIER_HEAD(dmc_notifier_list); +static DEFINE_MUTEX(dmc_en_lock); +static DEFINE_MUTEX(dmc_sync_lock);
+void dmc_event(int event) +{
mutex_lock(&dmc_sync_lock);blocking_notifier_call_chain(&dmc_notifier_list, event, NULL);mutex_unlock(&dmc_sync_lock);+} +EXPORT_SYMBOL_GPL(dmc_event);
+/**
- rockchip_dmc_enabled - Returns true if dmc freq is enabled, false otherwise.
- */
+bool rockchip_dmc_enabled(void) +{
return num_disable <= 0 && num_wait <= 1;+} +EXPORT_SYMBOL_GPL(rockchip_dmc_enabled);
+/**
- rockchip_dmc_enable - Enable dmc frequency scaling. Will only enable
- frequency scaling if there are 1 or fewer notifiers. Call to undo
- rockchip_dmc_disable.
- */
+void rockchip_dmc_enable(void) +{
mutex_lock(&dmc_en_lock);num_disable--;WARN_ON(num_disable < 0);if (rockchip_dmc_enabled())dmc_event(DMC_ENABLE);mutex_unlock(&dmc_en_lock);+} +EXPORT_SYMBOL_GPL(rockchip_dmc_enable);
+/**
- rockchip_dmc_disable - Disable dmc frequency scaling. Call when something
- cannot coincide with dmc frequency scaling.
- */
+void rockchip_dmc_disable(void) +{
mutex_lock(&dmc_en_lock);if (rockchip_dmc_enabled())dmc_event(DMC_DISABLE);num_disable++;mutex_unlock(&dmc_en_lock);+} +EXPORT_SYMBOL_GPL(rockchip_dmc_disable);
+int dmc_register_notifier(struct notifier_block *nb) +{
int ret;if (!nb)return -EINVAL;ret = blocking_notifier_chain_register(&dmc_notifier_list, nb);return ret;+} +EXPORT_SYMBOL_GPL(dmc_register_notifier);
+int dmc_unregister_notifier(struct notifier_block *nb) +{
int ret;if (!nb)return -EINVAL;ret = blocking_notifier_chain_unregister(&dmc_notifier_list, nb);return ret;+} +EXPORT_SYMBOL_GPL(dmc_unregister_notifier);
+int rockchip_dmc_get(struct notifier_block *nb) +{
if (!nb)return -EINVAL;mutex_lock(&dmc_en_lock);/* if use two vop, need to disable dmc */if (num_wait == 1 && num_disable <= 0)dmc_event(DMC_DISABLE);num_wait++;dmc_register_notifier(nb);mutex_unlock(&dmc_en_lock);return 0;+} +EXPORT_SYMBOL_GPL(rockchip_dmc_get);
+int rockchip_dmc_put(struct notifier_block *nb) +{
if (!nb)return -EINVAL;mutex_lock(&dmc_en_lock);num_wait--;/* from 2 vop back to 1 vop, need enable dmc */if (num_wait == 1 && num_disable <= 0)dmc_event(DMC_ENABLE);dmc_unregister_notifier(nb);mutex_unlock(&dmc_en_lock);return 0;+} +EXPORT_SYMBOL_GPL(rockchip_dmc_put); diff --git a/include/soc/rockchip/rockchip_dmc.h b/include/soc/rockchip/rockchip_dmc.h new file mode 100644 index 0000000..6bb58d6 --- /dev/null +++ b/include/soc/rockchip/rockchip_dmc.h @@ -0,0 +1,44 @@ +/*
- Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
- 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.
- */
+#ifndef __SOC_ROCKCHIP_DMC_H +#define __SOC_ROCKCHIP_DMC_H
+#include <linux/notifier.h>
+#define DMC_ENABLE 0 +#define DMC_DISABLE 1 +#define DMCFREQ_ADJUST 2 +#define DMCFREQ_FINISH 3
+#ifdef CONFIG_ARM_ROCKCHIP_DMC_DEVFREQ +int rockchip_dmc_get(struct notifier_block *nb); +int rockchip_dmc_put(struct notifier_block *nb); +#else +static inline int rockchip_dmc_get(struct notifier_block *nb) +{
return 0;+} +static inline int rockchip_dmc_put(struct notifier_block *nb) +{
return 0;+} +#endif
+void dmc_event(int event); +int dmc_register_notifier(struct notifier_block *nb); +int dmc_unregister_notifier(struct notifier_block *nb); +void rockchip_dmc_enable(void); +void rockchip_dmc_disable(void); +bool rockchip_dmc_enabled(void);
+#endif
1.9.1