Re: [RFC PATCH 3/4] PM / devfreq: rockchip: add devfreq driver for rk3399 dmc

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Hi Chanwoo Choi,

    I just check the devfreq-event framework code, it is good,
i will do more dig to see whether it can fit for rk3399 dmc, thank you.

On 2016年06月01日 19:47, Chanwoo Choi wrote:
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=f262f28c147051e7aa6daaf4fb5996833ffadff4

[2] Exynos Noc probe driver by using Devfreq-Event framework
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0179a913875a8b39eaf5b848c876439a3a4650af

[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=0722249ac1f3dcc3af9e9d7ed89792a68f066660

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@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxx>
---
  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-$(CONFIG_PM_DEVFREQ_EVENT)         += event/
diff --git a/drivers/devfreq/rockchip/Kconfig b/drivers/devfreq/rockchip/Kconfig
new file mode 100644
index 0000000..617b5fe
--- /dev/null
+++ b/drivers/devfreq/rockchip/Kconfig
@@ -0,0 +1,14 @@
+config ARM_ROCKCHIP_DMC_DEVFREQ
+       tristate "ARM ROCKCHIP DMC DEVFREQ Driver"
+       depends on ARCH_ROCKCHIP
+       help
+         This adds the DEVFREQ driver framework for the rockchip dmc.
+
+config ARM_RK3399_DMC_DEVFREQ
+       tristate "ARM RK3399 DMC DEVFREQ Driver"
+       depends on ARM_ROCKCHIP_DMC_DEVFREQ
+       select PM_OPP
+       select DEVFREQ_GOV_SIMPLE_ONDEMAND
+       help
+         This adds the DEVFREQ driver for the RK3399 dmc. It sets the frequency
+         for the memory controller and reads the usage counts from hardware.
diff --git a/drivers/devfreq/rockchip/Makefile b/drivers/devfreq/rockchip/Makefile
new file mode 100644
index 0000000..caca525
--- /dev/null
+++ b/drivers/devfreq/rockchip/Makefile
@@ -0,0 +1,2 @@
+obj-$(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@xxxxxxxxxxxxxx>
+ *
+ * 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@xxxxxxxxxxxxxx>
+ * Base on: https://chromium-review.googlesource.com/#/c/231477/
+ *
+ * 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




--
Lin Huang


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