mediatek: update to latest kernel patchset from v4.13-rc

Signed-off-by: Muciri Gatimu <muciri@openmesh.com>
Signed-off-by: Shashidhar Lakkavalli <shashidhar.lakkavalli@openmesh.com>
Signed-off-by: John Crispin <john@phrozen.org>

1 files changed, 433 insertions, 0 deletions

diff --git a/target/linux/mediatek/patches-4.9/0015-cpufreq-mediatek-add-driver.patch b/target/linux/mediatek/patches-4.9/0015-cpufreq-mediatek-add-driver.patch
new file mode 100644
index 0000000000..af60025c0a
--- /dev/null
+++ b/target/linux/mediatek/patches-4.9/0015-cpufreq-mediatek-add-driver.patch
@@ -0,0 +1,433 @@
+From 8aa2c6c4d8b20c0e9c69b15db4a0039d33f8b365 Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Wed, 30 Mar 2016 23:48:53 +0200
+Subject: [PATCH 15/57] cpufreq: mediatek: add driver
+
+Signed-off-by: John Crispin <john@phrozen.org>
+---
+ drivers/cpufreq/Kconfig.arm      |   9 +
+ drivers/cpufreq/Makefile         |   1 +
+ drivers/cpufreq/mt7623-cpufreq.c | 389 +++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 399 insertions(+)
+ create mode 100644 drivers/cpufreq/mt7623-cpufreq.c
+
+--- a/drivers/cpufreq/Kconfig.arm
++++ b/drivers/cpufreq/Kconfig.arm
+@@ -74,6 +74,15 @@ config ARM_KIRKWOOD_CPUFREQ
+ 	  This adds the CPUFreq driver for Marvell Kirkwood
+ 	  SoCs.
+ 
++config ARM_MT7623_CPUFREQ
++	bool "Mediatek MT7623 CPUFreq support"
++	depends on ARCH_MEDIATEK && REGULATOR
++	depends on ARM || (ARM_CPU_TOPOLOGY && COMPILE_TEST)
++	depends on !CPU_THERMAL || THERMAL=y
++	select PM_OPP
++	help
++	  This adds the CPUFreq driver support for Mediatek MT7623 SoC.
++
+ config ARM_MT8173_CPUFREQ
+ 	tristate "Mediatek MT8173 CPUFreq support"
+ 	depends on ARCH_MEDIATEK && REGULATOR
+--- a/drivers/cpufreq/Makefile
++++ b/drivers/cpufreq/Makefile
+@@ -58,6 +58,7 @@ obj-$(CONFIG_ARM_HIGHBANK_CPUFREQ)	+= hi
+ obj-$(CONFIG_ARM_IMX6Q_CPUFREQ)		+= imx6q-cpufreq.o
+ obj-$(CONFIG_ARM_INTEGRATOR)		+= integrator-cpufreq.o
+ obj-$(CONFIG_ARM_KIRKWOOD_CPUFREQ)	+= kirkwood-cpufreq.o
++obj-$(CONFIG_ARM_MT7623_CPUFREQ)	+= mt7623-cpufreq.o
+ obj-$(CONFIG_ARM_MT8173_CPUFREQ)	+= mt8173-cpufreq.o
+ obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ)	+= omap-cpufreq.o
+ obj-$(CONFIG_ARM_PXA2xx_CPUFREQ)	+= pxa2xx-cpufreq.o
+--- /dev/null
++++ b/drivers/cpufreq/mt7623-cpufreq.c
+@@ -0,0 +1,389 @@
++/*
++ * Copyright (c) 2015 Linaro Ltd.
++ * Author: Pi-Cheng Chen <pi-cheng.chen@linaro.org>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 as
++ * published by the Free Software Foundation.
++ *
++ * This program is distributed in the hope that 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/cpu.h>
++#include <linux/cpu_cooling.h>
++#include <linux/cpufreq.h>
++#include <linux/cpumask.h>
++#include <linux/of.h>
++#include <linux/platform_device.h>
++#include <linux/pm_opp.h>
++#include <linux/regulator/consumer.h>
++#include <linux/slab.h>
++#include <linux/thermal.h>
++
++#define VOLT_TOL		(10000)
++
++/*
++ * When scaling the clock frequency of a CPU clock domain, the clock source
++ * needs to be switched to another stable PLL clock temporarily until
++ * the original PLL becomes stable at target frequency.
++ */
++struct mtk_cpu_dvfs_info {
++	struct device *cpu_dev;
++	struct regulator *proc_reg;
++	struct clk *cpu_clk;
++	struct clk *inter_clk;
++	struct thermal_cooling_device *cdev;
++	int intermediate_voltage;
++};
++
++static int mtk_cpufreq_set_voltage(struct mtk_cpu_dvfs_info *info, int vproc)
++{
++	return regulator_set_voltage(info->proc_reg, vproc,
++				     vproc + VOLT_TOL);
++}
++
++static int mtk_cpufreq_set_target(struct cpufreq_policy *policy,
++				  unsigned int index)
++{
++	struct cpufreq_frequency_table *freq_table = policy->freq_table;
++	struct clk *cpu_clk = policy->clk;
++	struct clk *armpll = clk_get_parent(cpu_clk);
++	struct mtk_cpu_dvfs_info *info = policy->driver_data;
++	struct device *cpu_dev = info->cpu_dev;
++	struct dev_pm_opp *opp;
++	long freq_hz, old_freq_hz;
++	int vproc, old_vproc, inter_vproc, target_vproc, ret;
++
++	inter_vproc = info->intermediate_voltage;
++
++	old_freq_hz = clk_get_rate(cpu_clk);
++	old_vproc = regulator_get_voltage(info->proc_reg);
++
++	freq_hz = freq_table[index].frequency * 1000;
++
++	rcu_read_lock();
++	opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_hz);
++	if (IS_ERR(opp)) {
++		rcu_read_unlock();
++		pr_err("cpu%d: failed to find OPP for %ld\n",
++		       policy->cpu, freq_hz);
++		return PTR_ERR(opp);
++	}
++	vproc = dev_pm_opp_get_voltage(opp);
++	rcu_read_unlock();
++
++	/*
++	 * If the new voltage or the intermediate voltage is higher than the
++	 * current voltage, scale up voltage first.
++	 */
++	target_vproc = (inter_vproc > vproc) ? inter_vproc : vproc;
++	if (old_vproc < target_vproc) {
++		ret = mtk_cpufreq_set_voltage(info, target_vproc);
++		if (ret) {
++			pr_err("cpu%d: failed to scale up voltage!\n",
++			       policy->cpu);
++			mtk_cpufreq_set_voltage(info, old_vproc);
++			return ret;
++		}
++	}
++
++	/* Reparent the CPU clock to intermediate clock. */
++	ret = clk_set_parent(cpu_clk, info->inter_clk);
++	if (ret) {
++		pr_err("cpu%d: failed to re-parent cpu clock!\n",
++		       policy->cpu);
++		mtk_cpufreq_set_voltage(info, old_vproc);
++		WARN_ON(1);
++		return ret;
++	}
++
++	/* Set the original PLL to target rate. */
++	ret = clk_set_rate(armpll, freq_hz);
++	if (ret) {
++		pr_err("cpu%d: failed to scale cpu clock rate!\n",
++		       policy->cpu);
++		clk_set_parent(cpu_clk, armpll);
++		mtk_cpufreq_set_voltage(info, old_vproc);
++		return ret;
++	}
++
++	/* Set parent of CPU clock back to the original PLL. */
++	ret = clk_set_parent(cpu_clk, armpll);
++	if (ret) {
++		pr_err("cpu%d: failed to re-parent cpu clock!\n",
++		       policy->cpu);
++		mtk_cpufreq_set_voltage(info, inter_vproc);
++		WARN_ON(1);
++		return ret;
++	}
++
++	/*
++	 * If the new voltage is lower than the intermediate voltage or the
++	 * original voltage, scale down to the new voltage.
++	 */
++	if (vproc < inter_vproc || vproc < old_vproc) {
++		ret = mtk_cpufreq_set_voltage(info, vproc);
++		if (ret) {
++			pr_err("cpu%d: failed to scale down voltage!\n",
++			       policy->cpu);
++			clk_set_parent(cpu_clk, info->inter_clk);
++			clk_set_rate(armpll, old_freq_hz);
++			clk_set_parent(cpu_clk, armpll);
++			return ret;
++		}
++	}
++
++	return 0;
++}
++
++static void mtk_cpufreq_ready(struct cpufreq_policy *policy)
++{
++	struct mtk_cpu_dvfs_info *info = policy->driver_data;
++	struct device_node *np = of_node_get(info->cpu_dev->of_node);
++
++	if (WARN_ON(!np))
++		return;
++
++	if (of_find_property(np, "#cooling-cells", NULL)) {
++		info->cdev = of_cpufreq_cooling_register(np,
++							 policy->related_cpus);
++
++		if (IS_ERR(info->cdev)) {
++			dev_err(info->cpu_dev,
++				"running cpufreq without cooling device: %ld\n",
++				PTR_ERR(info->cdev));
++
++			info->cdev = NULL;
++		}
++	}
++
++	of_node_put(np);
++}
++
++static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
++{
++	struct device *cpu_dev;
++	struct regulator *proc_reg = ERR_PTR(-ENODEV);
++	struct clk *cpu_clk = ERR_PTR(-ENODEV);
++	struct clk *inter_clk = ERR_PTR(-ENODEV);
++	struct dev_pm_opp *opp;
++	unsigned long rate;
++	int ret;
++
++	cpu_dev = get_cpu_device(cpu);
++	if (!cpu_dev) {
++		pr_err("failed to get cpu%d device\n", cpu);
++		return -ENODEV;
++	}
++
++	cpu_clk = clk_get(cpu_dev, "cpu");
++	if (IS_ERR(cpu_clk)) {
++		if (PTR_ERR(cpu_clk) == -EPROBE_DEFER)
++			pr_warn("cpu clk for cpu%d not ready, retry.\n", cpu);
++		else
++			pr_err("failed to get cpu clk for cpu%d\n", cpu);
++
++		ret = PTR_ERR(cpu_clk);
++		return ret;
++	}
++
++	inter_clk = clk_get(cpu_dev, "intermediate");
++	if (IS_ERR(inter_clk)) {
++		if (PTR_ERR(inter_clk) == -EPROBE_DEFER)
++			pr_warn("intermediate clk for cpu%d not ready, retry.\n",
++				cpu);
++		else
++			pr_err("failed to get intermediate clk for cpu%d\n",
++			       cpu);
++
++		ret = PTR_ERR(inter_clk);
++		goto out_free_resources;
++	}
++
++	proc_reg = regulator_get_exclusive(cpu_dev, "proc");
++	if (IS_ERR(proc_reg)) {
++		if (PTR_ERR(proc_reg) == -EPROBE_DEFER)
++			pr_warn("proc regulator for cpu%d not ready, retry.\n",
++				cpu);
++		else
++			pr_err("failed to get proc regulator for cpu%d\n",
++			       cpu);
++
++		ret = PTR_ERR(proc_reg);
++		goto out_free_resources;
++	}
++
++	ret = dev_pm_opp_of_add_table(cpu_dev);
++	if (ret) {
++		pr_warn("no OPP table for cpu%d\n", cpu);
++		goto out_free_resources;
++	}
++
++	/* Search a safe voltage for intermediate frequency. */
++	rate = clk_get_rate(inter_clk);
++	rcu_read_lock();
++	opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
++	if (IS_ERR(opp)) {
++		rcu_read_unlock();
++		pr_err("failed to get intermediate opp for cpu%d\n", cpu);
++		ret = PTR_ERR(opp);
++		goto out_free_opp_table;
++	}
++	info->intermediate_voltage = dev_pm_opp_get_voltage(opp);
++	rcu_read_unlock();
++
++	info->cpu_dev = cpu_dev;
++	info->proc_reg = proc_reg;
++	info->cpu_clk = cpu_clk;
++	info->inter_clk = inter_clk;
++
++	return 0;
++
++out_free_opp_table:
++	dev_pm_opp_of_remove_table(cpu_dev);
++
++out_free_resources:
++	if (!IS_ERR(proc_reg))
++		regulator_put(proc_reg);
++	if (!IS_ERR(cpu_clk))
++		clk_put(cpu_clk);
++	if (!IS_ERR(inter_clk))
++		clk_put(inter_clk);
++
++	return ret;
++}
++
++static void mtk_cpu_dvfs_info_release(struct mtk_cpu_dvfs_info *info)
++{
++	if (!IS_ERR(info->proc_reg))
++		regulator_put(info->proc_reg);
++	if (!IS_ERR(info->cpu_clk))
++		clk_put(info->cpu_clk);
++	if (!IS_ERR(info->inter_clk))
++		clk_put(info->inter_clk);
++
++	dev_pm_opp_of_remove_table(info->cpu_dev);
++}
++
++static int mtk_cpufreq_init(struct cpufreq_policy *policy)
++{
++	struct mtk_cpu_dvfs_info *info;
++	struct cpufreq_frequency_table *freq_table;
++	int ret;
++
++	info = kzalloc(sizeof(*info), GFP_KERNEL);
++	if (!info)
++		return -ENOMEM;
++
++	ret = mtk_cpu_dvfs_info_init(info, policy->cpu);
++	if (ret) {
++		pr_err("%s failed to initialize dvfs info for cpu%d\n",
++		       __func__, policy->cpu);
++		goto out_free_dvfs_info;
++	}
++
++	ret = dev_pm_opp_init_cpufreq_table(info->cpu_dev, &freq_table);
++	if (ret) {
++		pr_err("failed to init cpufreq table for cpu%d: %d\n",
++		       policy->cpu, ret);
++		goto out_release_dvfs_info;
++	}
++
++	ret = cpufreq_table_validate_and_show(policy, freq_table);
++	if (ret) {
++		pr_err("%s: invalid frequency table: %d\n", __func__, ret);
++		goto out_free_cpufreq_table;
++	}
++
++	/* CPUs in the same cluster share a clock and power domain. */
++	cpumask_setall(policy->cpus);
++	policy->driver_data = info;
++	policy->clk = info->cpu_clk;
++
++	return 0;
++
++out_free_cpufreq_table:
++	dev_pm_opp_free_cpufreq_table(info->cpu_dev, &freq_table);
++
++out_release_dvfs_info:
++	mtk_cpu_dvfs_info_release(info);
++
++out_free_dvfs_info:
++	kfree(info);
++
++	return ret;
++}
++
++static int mtk_cpufreq_exit(struct cpufreq_policy *policy)
++{
++	struct mtk_cpu_dvfs_info *info = policy->driver_data;
++
++	cpufreq_cooling_unregister(info->cdev);
++	dev_pm_opp_free_cpufreq_table(info->cpu_dev, &policy->freq_table);
++	mtk_cpu_dvfs_info_release(info);
++	kfree(info);
++
++	return 0;
++}
++
++static struct cpufreq_driver mt7623_cpufreq_driver = {
++	.flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK,
++	.verify = cpufreq_generic_frequency_table_verify,
++	.target_index = mtk_cpufreq_set_target,
++	.get = cpufreq_generic_get,
++	.init = mtk_cpufreq_init,
++	.exit = mtk_cpufreq_exit,
++	.ready = mtk_cpufreq_ready,
++	.name = "mtk-cpufreq",
++	.attr = cpufreq_generic_attr,
++};
++
++static int mt7623_cpufreq_probe(struct platform_device *pdev)
++{
++	int ret;
++
++	ret = cpufreq_register_driver(&mt7623_cpufreq_driver);
++	if (ret)
++		pr_err("failed to register mtk cpufreq driver\n");
++
++	return ret;
++}
++
++static struct platform_driver mt7623_cpufreq_platdrv = {
++	.driver = {
++		.name	= "mt7623-cpufreq",
++	},
++	.probe		= mt7623_cpufreq_probe,
++};
++
++static int mt7623_cpufreq_driver_init(void)
++{
++	struct platform_device *pdev;
++	int err;
++
++	if (!of_machine_is_compatible("mediatek,mt7623"))
++		return -ENODEV;
++
++	err = platform_driver_register(&mt7623_cpufreq_platdrv);
++	if (err)
++		return err;
++
++	/*
++	 * Since there's no place to hold device registration code and no
++	 * device tree based way to match cpufreq driver yet, both the driver
++	 * and the device registration codes are put here to handle defer
++	 * probing.
++	 */
++	pdev = platform_device_register_simple("mt7623-cpufreq", -1, NULL, 0);
++	if (IS_ERR(pdev)) {
++		pr_err("failed to register mtk-cpufreq platform device\n");
++		return PTR_ERR(pdev);
++	}
++
++	return 0;
++}
++device_initcall(mt7623_cpufreq_driver_init);