Messages in this thread | ![/](/images/icornerl.gif) | | Subject | Re: [PATCH v3 6/7] PM / devfreq: rockchip: add devfreq driver for rk3399 dmc | From | hl <> | Date | Tue, 26 Jul 2016 09:15:10 +0800 |
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Hi Chanwoo Choi,
On 2016年07月25日 17:45, Chanwoo Choi wrote: > Hi Lin, > > On 2016년 07월 25일 17:47, hl wrote: >> Hi Chanwoo Choi, >> >> On 2016年07月25日 14:01, Chanwoo Choi wrote: >>> Hi Lin, >>> >>> I'm glad to support the for dmc ddr clock scaling with devfreq/devfreq-event. >>> >>> But, I think that you have to use the standard interface. >>> As I already mentioned[1] on previous mail, devfreq fwk support >>> the standard DEVFREQ_TRANSITION_NOTIFIER notifier which has the two notifications. >>> - DEVFREQ_PRECHANGE >>> - DEVFREQ_POSTCHANGE >>> [1] https://patchwork.kernel.org/patch/9194305/ >>> >>> You can use the DEVFREQ_PRECHANGE instead of DMCFREQ_ADJUST >>> and use the DEVFREQ_POSTCHANGE instead of DMCFREQ_FINISH. >>> >>> On 2016년 07월 22일 18:07, Lin Huang wrote: >>>> 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 <hl@rock-chips.com> >>>> --- >>>> 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 | 1 + >>>> drivers/devfreq/Makefile | 1 + >>>> drivers/devfreq/rockchip/Kconfig | 15 + >>>> drivers/devfreq/rockchip/Makefile | 2 + >>>> drivers/devfreq/rockchip/rk3399_dmc.c | 482 ++++++++++++++++++++++++++++++++ >>>> drivers/devfreq/rockchip/rockchip_dmc.c | 143 ++++++++++ >>>> include/soc/rockchip/rockchip_dmc.h | 45 +++ >>>> 7 files changed, 689 insertions(+) >>>> 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 a5be56e..cb67246 100644 >>>> --- a/drivers/devfreq/Kconfig >>>> +++ b/drivers/devfreq/Kconfig >>>> @@ -101,5 +101,6 @@ 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-$(CONFIG_PM_DEVFREQ_EVENT) += event/ >>>> diff --git a/drivers/devfreq/rockchip/Kconfig b/drivers/devfreq/rockchip/Kconfig >>>> new file mode 100644 >>>> index 0000000..7fb1cff >>>> --- /dev/null >>>> +++ b/drivers/devfreq/rockchip/Kconfig >>>> @@ -0,0 +1,15 @@ >>>> +config ARM_ROCKCHIP_DMC_DEVFREQ >>>> + bool "ARM ROCKCHIP DMC DEVFREQ Driver" >>>> + depends on ARCH_ROCKCHIP >>>> + help >>>> + This adds the DEVFREQ driver framework for the rockchip dmc. >>>> + >>>> +config ARM_RK3399_DMC_DEVFREQ >>>> + bool "ARM RK3399 DMC DEVFREQ Driver" >>>> + depends on ARM_ROCKCHIP_DMC_DEVFREQ >>>> + select PM_OPP >>>> + select DEVFREQ_GOV_SIMPLE_ONDEMAND >>>> + help >>>> + This adds the DEVFREQ driver for the RK3399 dmc. It sets the frequency >>>> + for the memory controller and reads the usage counts from hardware. >>>> + >>>> diff --git a/drivers/devfreq/rockchip/Makefile b/drivers/devfreq/rockchip/Makefile >>>> new file mode 100644 >>>> index 0000000..caca525 >>>> --- /dev/null >>>> +++ b/drivers/devfreq/rockchip/Makefile >>>> @@ -0,0 +1,2 @@ >>>> +obj-$(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..f1d6120 >>>> --- /dev/null >>>> +++ b/drivers/devfreq/rockchip/rk3399_dmc.c >>>> @@ -0,0 +1,482 @@ >>>> +/* >>>> + * 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/devfreq-event.h> >>>> +#include <linux/interrupt.h> >>>> +#include <linux/module.h> >>>> +#include <linux/of.h> >>>> +#include <linux/platform_device.h> >>>> +#include <linux/pm_opp.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> >>>> +#include "../../firmware/rockchip_sip.h" >>>> + >>>> +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 notifier_block dmc_nb; >>>> + struct dram_timing *timing; >>>> + 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; >>>> +}; >>>> + >>>> +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); >>> You don't need to send the notification in target function. >>> When you use the DEVFREQ_TRANSITION_NOTIFIER notifier, >>> devfreq send the notification before calling the target() and after calling the target(). >> I checked DEVFREQ_TRANSISTION_NOTIFIER notifier before, but i have some question: >> Now i want to use >> DEVFREQ_PRECHANGE and DEVFREQ_POSTCHANGE in vop driver, but it hard to get the *devfreq >> in vop driver, or i can register a DEVFREQ_TRANSITION_NOTIFIER notifier in rk3399_dmc.c and >> when get message, post DEVFREQ_PRECHANGE or DEVFREQ_POSTCHANGE to vop driver through dmc_event(), >> do you have a better way to do it? > Firstly, > The devfreq has the devfreq_get_devfreq_by_phandle() function > to get the devfreq pointer in device tree. The vop_bind() > get the IORESOURCE_MEM and interrupt. So, I think that you > would get the devfreq pointer in the vop_bind() function. > So, DEVFREQ_TRANSITION_NOTIFIER can alter the following two notifications: > - dmc_event(DMCFREQ_ADJUST); > - dmc_event(DMCFREQ_FINISH); > > > Also, > devfreq-event fwk provide the devfreq_event_get_edev_by_phandle() funtcion > to get the devfreq-event pointer in the device tree. > > You could call the devfreq_event_[enable/disable[_edev() > and devfreq_[resume/suspend]_device in the drivers/gpu/drm/rockchip/rockchip_drm_vop.c > instead of dmc_event(DMC_ENABLE) / dmc_event(DMC_DISABLE). > > dmc_event(DMC_ENABLE); > devfreq_event_enable_edev(dmcfreq->edev); > devfreq_resume_device(dmcfreq->devfreq); > > dmc_event(DMC_DISABLE); > devfreq_event_disable_edev(dmcfreq->edev); > devfreq_suspend_device(dmcfreq->devfreq); > > I think that we have to use the standard interfaces and > functions providing by framework. It is not appropriate way > to define the specific functions for only one device driver > between other framework.
Thanks for you suggestion, this may be a huge update, i will try to implement it. > > Regards, > Chanwoo Choi > >>>> + dmcfreq->wait_dcf_flag = 1; >>>> + >>>> + 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); >>> ditto. >>> >>>> + goto out; >>>> + } >>>> + >>>> + /* >>>> + * wait until bcf irq happen, it means freq scaling finish in bl31, >>>> + * use 100ms as timeout time >>>> + */ >>>> + wait_event_timeout(dmcfreq->wait_dcf_queue, >>>> + !dmcfreq->wait_dcf_flag, HZ / 10); >>>> + >>>> + dmc_event(DMCFREQ_FINISH); >>> ditto. >>> >>>> + >>>> + /* >>>> + * 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 freq %lu,\ >>>> + Current freq %lu\n", target_rate, dmcfreq->rate); >>>> + regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt, >>>> + dmcfreq->volt); >>>> + } else 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); >>>> + >>>> +out: >>>> + mutex_unlock(&dmcfreq->lock); >>>> + return err; >>>> +} >>>> + >>>> +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); >>>> + struct devfreq_event_data edata; >>>> + >>>> + devfreq_event_get_event(dmcfreq->edev, &edata); >>>> + >>>> + stat->current_frequency = dmcfreq->rate; >>>> + stat->busy_time = edata.load_count; >>>> + stat->total_time = edata.total_count; >>>> + >>>> + 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_event_enable_edev(dmcfreq->edev); >>>> + devfreq_resume_device(dmcfreq->devfreq); >>>> + return NOTIFY_OK; >>>> + } else if (event == DMC_DISABLE) { >>>> + devfreq_event_disable_edev(dmcfreq->edev); >>>> + devfreq_suspend_device(dmcfreq->devfreq); >>>> + >>>> + /* 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; >>>> + >>>> + dmcfreq->wait_dcf_flag = 0; >>>> + wake_up(&dmcfreq->wait_dcf_queue); >>>> + >>>> + /* clr dcf irq */ >>>> + sip_smc_clr_ddr_irq(); >>>> + >>>> + return IRQ_HANDLED; >>>> +} >>>> + >>>> +static int of_do_get_timing(struct device_node *np, >>>> + struct dram_timing *timing) >>>> +{ >>>> + int ret; >>>> + >>>> + ret = of_property_read_u32(np, "ddr3_speed_bin", >>>> + &timing->ddr3_speed_bin); >>>> + ret |= of_property_read_u32(np, "pd_idle", &timing->pd_idle); >>>> + ret |= of_property_read_u32(np, "sr_idle", &timing->sr_idle); >>>> + ret |= of_property_read_u32(np, "sr_mc_gate_idle", >>>> + &timing->sr_mc_gate_idle); >>>> + ret |= of_property_read_u32(np, "srpd_lite_idle", >>>> + &timing->srpd_lite_idle); >>>> + ret |= of_property_read_u32(np, "standby_idle", &timing->standby_idle); >>>> + ret |= of_property_read_u32(np, "dram_dll_dis_freq", >>>> + &timing->dram_dll_dis_freq); >>>> + ret |= of_property_read_u32(np, "phy_dll_dis_freq", >>>> + &timing->phy_dll_dis_freq); >>>> + ret |= of_property_read_u32(np, "ddr3_odt_dis_freq", >>>> + &timing->ddr3_odt_dis_freq); >>>> + ret |= of_property_read_u32(np, "ddr3_drv", &timing->ddr3_drv); >>>> + ret |= of_property_read_u32(np, "ddr3_odt", &timing->ddr3_odt); >>>> + ret |= of_property_read_u32(np, "phy_ddr3_ca_drv", >>>> + &timing->phy_ddr3_ca_drv); >>>> + ret |= of_property_read_u32(np, "phy_ddr3_dq_drv", >>>> + &timing->phy_ddr3_dq_drv); >>>> + ret |= of_property_read_u32(np, "phy_ddr3_odt", &timing->phy_ddr3_odt); >>>> + ret |= of_property_read_u32(np, "lpddr3_odt_dis_freq", >>>> + &timing->lpddr3_odt_dis_freq); >>>> + ret |= of_property_read_u32(np, "lpddr3_drv", &timing->lpddr3_drv); >>>> + ret |= of_property_read_u32(np, "lpddr3_odt", &timing->lpddr3_odt); >>>> + ret |= of_property_read_u32(np, "phy_lpddr3_ca_drv", >>>> + &timing->phy_lpddr3_ca_drv); >>>> + ret |= of_property_read_u32(np, "phy_lpddr3_dq_drv", >>>> + &timing->phy_lpddr3_dq_drv); >>>> + ret |= of_property_read_u32(np, "phy_lpddr3_odt", >>>> + &timing->phy_lpddr3_odt); >>>> + ret |= of_property_read_u32(np, "lpddr4_odt_dis_freq", >>>> + &timing->lpddr4_odt_dis_freq); >>>> + ret |= of_property_read_u32(np, "lpddr4_drv", >>>> + &timing->lpddr4_drv); >>>> + ret |= of_property_read_u32(np, "lpddr4_dq_odt", >>>> + &timing->lpddr4_dq_odt); >>>> + ret |= of_property_read_u32(np, "lpddr4_ca_odt", >>>> + &timing->lpddr4_ca_odt); >>>> + ret |= of_property_read_u32(np, "phy_lpddr4_ca_drv", >>>> + &timing->phy_lpddr4_ca_drv); >>>> + ret |= of_property_read_u32(np, "phy_lpddr4_ck_cs_drv", >>>> + &timing->phy_lpddr4_ck_cs_drv); >>>> + ret |= of_property_read_u32(np, "phy_lpddr4_dq_drv", >>>> + &timing->phy_lpddr4_dq_drv); >>>> + ret |= of_property_read_u32(np, "phy_lpddr4_odt", >>>> + &timing->phy_lpddr4_odt); >>>> + >>>> + return ret; >>>> +} >>>> + >>>> +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; >>>> + >>>> + np_tim = of_parse_phandle(np, "ddr_timing", 0); >>>> + if (np_tim) { >>>> + timing = devm_kzalloc(dev, sizeof(*timing), GFP_KERNEL); >>>> + if (!timing) >>>> + goto err; >>>> + if (of_do_get_timing(np_tim, timing)) { >>>> + devm_kfree(dev, timing); >>>> + goto err; >>>> + } >>>> + return timing; >>>> + } >>>> + >>>> +err: >>>> + if (timing) { >>>> + devm_kfree(dev, timing); >>>> + timing = NULL; >>>> + } >>>> + >>>> + return timing; >>>> +} >>>> + >>>> +static int rk3399_dmcfreq_probe(struct platform_device *pdev) >>>> +{ >>>> + struct device *dev = &pdev->dev; >>>> + struct rk3399_dmcfreq *data; >>>> + int ret, irq, index; >>>> + uint64_t param = 0; >>>> + uint32_t *timing; >>>> + struct device_node *np = pdev->dev.of_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); >>>> + >>>> + 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->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"); >>>> + 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); >>>> + 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->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, 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 bl31 */ >>>> + data->timing = of_get_ddr_timings(dev, np); >>>> + if (data->timing) { >>>> + timing = (uint32_t *)data->timing; >>>> + for (index = 0; index < (sizeof(struct dram_timing) / 4); >>>> + index++) { >>>> + param = index; >>>> + param = param << 32 | *timing++; >>>> + sip_smc_set_ddr_param(param); >>>> + param = 0; >>>> + } >>>> + } >>>> + sip_smc_ddr_init(); >>>> + >>>> + init_waitqueue_head(&data->wait_dcf_queue); >>>> + data->wait_dcf_flag = 0; >>>> + >>>> + 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..78baee5 >>>> --- /dev/null >>>> +++ b/drivers/devfreq/rockchip/rockchip_dmc.c >>>> @@ -0,0 +1,143 @@ >>>> +/* >>>> + * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd >>>> + * Author: Lin Huang <hl@rock-chips.com> >>>> + * 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); >>>> + >>>> +/** >>>> + * rockchip_dmc_enabled - Returns true if dmc freq is enabled, false otherwise. >>>> + */ >>>> +bool rockchip_dmc_enabled(void) >>>> +{ >>>> + return num_disable <= 0 && num_wait <= 1; >>>> +} >>>> + >>>> +/** >>>> + * 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); >>>> +} >>>> + >>>> +/** >>>> + * 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); >>>> +} >>>> + >>>> +void dmc_event(int event) >>>> +{ >>>> + mutex_lock(&dmc_sync_lock); >>>> + blocking_notifier_call_chain(&dmc_notifier_list, event, NULL); >>>> + mutex_unlock(&dmc_sync_lock); >>>> +} >>>> + >>>> +/** >>>> + * dmc_register_notifier - register a driver to dmc chain >>>> + * @nb: notifier function to register >>>> + */ >>>> +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; >>>> +} >>>> + >>>> +/** >>>> + * dmc_unregister_notifier - unregister a driver from dmc chain >>>> + * @nb: remove notifier function >>>> + */ >>>> +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; >>>> +} >>>> + >>>> +/** >>>> + * rockchip_dmc_get - Register the notifier block for the dmc chain. >>>> + * @nb The dmc notifier block to register >>>> + */ >>>> +int rockchip_dmc_get(struct notifier_block *nb) >>>> +{ >>>> + if (!nb) >>>> + return -EINVAL; >>>> + >>>> + mutex_lock(&dmc_en_lock); >>>> + >>>> + /* >>>> + * if have two notifier(enable two vop etc), >>>> + * 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; >>>> +} >>>> + >>>> +/** >>>> + * rockchip_dmc_put - Remove the notifier block from the dmc chain. >>>> + * @nb The dmc notifier block to unregister >>>> + */ >>>> +int rockchip_dmc_put(struct notifier_block *nb) >>>> +{ >>>> + if (!nb) >>>> + return -EINVAL; >>>> + >>>> + mutex_lock(&dmc_en_lock); >>>> + num_wait--; >>>> + >>>> + /* if notifier from 2 back to 1, enable dmc again */ >>>> + if (num_wait == 1 && num_disable <= 0) >>>> + dmc_event(DMC_ENABLE); >>>> + dmc_unregister_notifier(nb); >>>> + mutex_unlock(&dmc_en_lock); >>>> + >>>> + return 0; >>>> +} >>>> diff --git a/include/soc/rockchip/rockchip_dmc.h b/include/soc/rockchip/rockchip_dmc.h >>>> new file mode 100644 >>>> index 0000000..3f69cbf >>>> --- /dev/null >>>> +++ b/include/soc/rockchip/rockchip_dmc.h >>>> @@ -0,0 +1,45 @@ >>>> +/* >>>> + * 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 >>>> + >>>> +#if IS_ENABLED(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 >>>> >>> Regards, >>> Chanwoo Choi >>> >>> >>> _______________________________________________ >>> Linux-rockchip mailing list >>> Linux-rockchip@lists.infradead.org >>> http://lists.infradead.org/mailman/listinfo/linux-rockchip > > >
-- Lin Huang
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