From 681f28990d7b44e218335968ebb4cfaca1349a77 Mon Sep 17 00:00:00 2001 From: Pavel Kubelun Date: Wed, 2 Nov 2016 22:37:28 +0300 Subject: [PATCH] ipq806x: switch to generic cpufreq driver cpufreq-dt This fixes ondemand frequency scaling and moves ipq806x onto upstream driver Also switching to ondemand frequency scaling as it is fixed now Signed-off-by: Pavel Kubelun --- target/linux/ipq806x/config-4.4 | 10 +- ...-Add-a-cpufreq-krait-based-on-cpufre.patch | 461 ------------------ ...-dt-Handle-OPP-voltage-adjust-events.patch | 184 +++++++ ...-dt-Add-L2-frequency-scaling-support.patch | 161 ++++++ ...ng-rcu_read_lock-for-find_device_opp.patch | 33 ++ 5 files changed, 383 insertions(+), 466 deletions(-) delete mode 100644 target/linux/ipq806x/patches-4.4/145-cpufreq-Add-a-cpufreq-krait-based-on-cpufre.patch create mode 100644 target/linux/ipq806x/patches-4.4/172-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch create mode 100644 target/linux/ipq806x/patches-4.4/173-cpufreq-dt-Add-L2-frequency-scaling-support.patch create mode 100644 target/linux/ipq806x/patches-4.4/174-cpufreq-dt-Add-missing-rcu_read_lock-for-find_device_opp.patch diff --git a/target/linux/ipq806x/config-4.4 b/target/linux/ipq806x/config-4.4 index 1972e3675e..7f0c7a9b86 100644 --- a/target/linux/ipq806x/config-4.4 +++ b/target/linux/ipq806x/config-4.4 @@ -77,7 +77,7 @@ CONFIG_COMMON_CLK=y CONFIG_COMMON_CLK_QCOM=y CONFIG_COMPACTION=y CONFIG_COREDUMP=y -# CONFIG_CPUFREQ_DT is not set +CONFIG_CPUFREQ_DT=y CONFIG_CPU_32v6K=y CONFIG_CPU_32v7=y CONFIG_CPU_ABRT_EV7=y @@ -89,7 +89,8 @@ CONFIG_CPU_COPY_V6=y CONFIG_CPU_CP15=y CONFIG_CPU_CP15_MMU=y CONFIG_CPU_FREQ=y -CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y +# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set +CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y CONFIG_CPU_FREQ_GOV_COMMON=y # CONFIG_CPU_FREQ_GOV_CONSERVATIVE is not set CONFIG_CPU_FREQ_GOV_ONDEMAND=y @@ -105,7 +106,7 @@ CONFIG_CPU_IDLE_GOV_MENU=y CONFIG_CPU_PABRT_V7=y CONFIG_CPU_PM=y CONFIG_CPU_RMAP=y -# CONFIG_CPU_THERMAL is not set +CONFIG_CPU_THERMAL=y CONFIG_CPU_TLB_V7=y CONFIG_CPU_V7=y CONFIG_CRC16=y @@ -146,7 +147,6 @@ CONFIG_GENERIC_ALLOCATOR=y CONFIG_GENERIC_BUG=y CONFIG_GENERIC_CLOCKEVENTS=y CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y -CONFIG_GENERIC_CPUFREQ_KRAIT=y CONFIG_GENERIC_IDLE_POLL_SETUP=y CONFIG_GENERIC_IO=y CONFIG_GENERIC_IRQ_SHOW=y @@ -378,7 +378,7 @@ CONFIG_QCOM_BAM_DMA=y CONFIG_QCOM_GDSC=y CONFIG_QCOM_GSBI=y CONFIG_QCOM_HFPLL=y -# CONFIG_QCOM_PM is not set +CONFIG_QCOM_PM=y CONFIG_QCOM_QFPROM=y CONFIG_QCOM_SCM=y CONFIG_QCOM_SCM_32=y diff --git a/target/linux/ipq806x/patches-4.4/145-cpufreq-Add-a-cpufreq-krait-based-on-cpufre.patch b/target/linux/ipq806x/patches-4.4/145-cpufreq-Add-a-cpufreq-krait-based-on-cpufre.patch deleted file mode 100644 index 67770e8ce9..0000000000 --- a/target/linux/ipq806x/patches-4.4/145-cpufreq-Add-a-cpufreq-krait-based-on-cpufre.patch +++ /dev/null @@ -1,461 +0,0 @@ -From dd77db4143290689d3a5e1ec61627233d0711b66 Mon Sep 17 00:00:00 2001 -From: Stephen Boyd -Date: Fri, 30 May 2014 16:36:11 -0700 -Subject: [PATCH] FROMLIST: cpufreq: Add a cpufreq-krait based on cpufreq-cpu0 - -Krait processors have individual clocks for each CPU that can -scale independently from one another. cpufreq-cpu0 is fairly -close to this, but assumes that there is only one clock for all -CPUs. Add a driver to support the Krait configuration. - -TODO: Merge into cpufreq-cpu0? Or make generic? - -Signed-off-by: Stephen Boyd - ---- - drivers/cpufreq/Kconfig | 13 +++ - drivers/cpufreq/Makefile | 1 + - drivers/cpufreq/cpufreq-krait.c | 190 ++++++++++++++++++++++++++++++++++++++++ - 3 files changed, 204 insertions(+) - create mode 100644 drivers/cpufreq/cpufreq-krait.c - ---- a/drivers/cpufreq/Kconfig -+++ b/drivers/cpufreq/Kconfig -@@ -198,6 +198,19 @@ config CPUFREQ_DT - - If in doubt, say N. - -+config GENERIC_CPUFREQ_KRAIT -+ tristate "Krait cpufreq driver" -+ depends on HAVE_CLK && OF -+ # if CPU_THERMAL is on and THERMAL=m, CPU0 cannot be =y: -+ depends on !CPU_THERMAL || THERMAL -+ select PM_OPP -+ help -+ This adds a generic cpufreq driver for CPU0 frequency management. -+ It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) -+ systems which share clock and voltage across all CPUs. -+ -+ If in doubt, say N. -+ - if X86 - source "drivers/cpufreq/Kconfig.x86" - endif ---- a/drivers/cpufreq/Makefile -+++ b/drivers/cpufreq/Makefile -@@ -13,6 +13,7 @@ obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE) - obj-$(CONFIG_CPU_FREQ_GOV_COMMON) += cpufreq_governor.o - - obj-$(CONFIG_CPUFREQ_DT) += cpufreq-dt.o -+obj-$(CONFIG_GENERIC_CPUFREQ_KRAIT) += cpufreq-krait.o - - ################################################################################## - # x86 drivers. ---- /dev/null -+++ b/drivers/cpufreq/cpufreq-krait.c -@@ -0,0 +1,390 @@ -+/* -+ * Copyright (C) 2012 Freescale Semiconductor, Inc. -+ * Copyright (c) 2014, The Linux Foundation. All rights reserved. -+ * -+ * The OPP code in function krait_set_target() is reused from -+ * drivers/cpufreq/omap-cpufreq.c -+ * -+ * 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. -+ */ -+ -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+ -+static unsigned int transition_latency; -+static unsigned int voltage_tolerance; /* in percentage */ -+ -+static struct device *cpu_dev; -+static DEFINE_PER_CPU(struct clk *, krait_cpu_clks); -+static DEFINE_PER_CPU(struct regulator *, krait_supply_core); -+static struct cpufreq_frequency_table *freq_table; -+static struct thermal_cooling_device *cdev; -+ -+struct cache_points { -+ unsigned long cache_freq; -+ unsigned int cache_volt; -+ unsigned long cpu_freq; -+}; -+ -+static struct regulator *krait_l2_reg; -+static struct clk *krait_l2_clk; -+static struct cache_points *krait_l2_points; -+static int nr_krait_l2_points; -+ -+static int krait_parse_cache_points(struct device *dev, -+ struct device_node *of_node) -+{ -+ const struct property *prop; -+ const __be32 *val; -+ int nr, i; -+ -+ prop = of_find_property(of_node, "cache-points-kHz", NULL); -+ if (!prop) -+ return -ENODEV; -+ if (!prop->value) -+ return -ENODATA; -+ -+ /* -+ * Each OPP is a set of tuples consisting of frequency and -+ * cpu-frequency like . -+ */ -+ nr = prop->length / sizeof(u32); -+ if (nr % 3) { -+ dev_err(dev, "%s: Invalid cache points\n", __func__); -+ return -EINVAL; -+ } -+ nr /= 3; -+ -+ krait_l2_points = devm_kcalloc(dev, nr, sizeof(*krait_l2_points), -+ GFP_KERNEL); -+ if (!krait_l2_points) -+ return -ENOMEM; -+ nr_krait_l2_points = nr; -+ -+ for (i = 0, val = prop->value; i < nr; i++) { -+ unsigned long cache_freq = be32_to_cpup(val++) * 1000; -+ unsigned int cache_volt = be32_to_cpup(val++); -+ unsigned long cpu_freq = be32_to_cpup(val++) * 1000; -+ -+ krait_l2_points[i].cache_freq = cache_freq; -+ krait_l2_points[i].cache_volt = cache_volt; -+ krait_l2_points[i].cpu_freq = cpu_freq; -+ } -+ -+ return 0; -+} -+ -+static int krait_set_target(struct cpufreq_policy *policy, unsigned int index) -+{ -+ struct dev_pm_opp *opp; -+ unsigned long volt = 0, volt_old = 0, tol = 0; -+ unsigned long freq, max_cpu_freq = 0; -+ unsigned int old_freq, new_freq; -+ long freq_Hz, freq_exact; -+ int ret, i; -+ struct clk *cpu_clk; -+ struct regulator *core; -+ unsigned int cpu; -+ -+ cpu_clk = per_cpu(krait_cpu_clks, policy->cpu); -+ -+ freq_Hz = clk_round_rate(cpu_clk, freq_table[index].frequency * 1000); -+ if (freq_Hz <= 0) -+ freq_Hz = freq_table[index].frequency * 1000; -+ -+ freq_exact = freq_Hz; -+ new_freq = freq_Hz / 1000; -+ old_freq = clk_get_rate(cpu_clk) / 1000; -+ -+ core = per_cpu(krait_supply_core, policy->cpu); -+ -+ rcu_read_lock(); -+ opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_Hz); -+ if (IS_ERR(opp)) { -+ rcu_read_unlock(); -+ pr_err("failed to find OPP for %ld\n", freq_Hz); -+ return PTR_ERR(opp); -+ } -+ volt = dev_pm_opp_get_voltage(opp); -+ rcu_read_unlock(); -+ tol = volt * voltage_tolerance / 100; -+ volt_old = regulator_get_voltage(core); -+ -+ pr_debug("%u MHz, %ld mV --> %u MHz, %ld mV\n", -+ old_freq / 1000, volt_old ? volt_old / 1000 : -1, -+ new_freq / 1000, volt ? volt / 1000 : -1); -+ -+ /* scaling up? scale voltage before frequency */ -+ if (new_freq > old_freq) { -+ ret = regulator_set_voltage_tol(core, volt, tol); -+ if (ret) { -+ pr_err("failed to scale voltage up: %d\n", ret); -+ return ret; -+ } -+ } -+ -+ ret = clk_set_rate(cpu_clk, freq_exact); -+ if (ret) { -+ pr_err("failed to set clock rate: %d\n", ret); -+ return ret; -+ } -+ -+ /* scaling down? scale voltage after frequency */ -+ if (new_freq < old_freq) { -+ ret = regulator_set_voltage_tol(core, volt, tol); -+ if (ret) { -+ pr_err("failed to scale voltage down: %d\n", ret); -+ clk_set_rate(cpu_clk, old_freq * 1000); -+ } -+ } -+ -+ for_each_possible_cpu(cpu) { -+ freq = clk_get_rate(per_cpu(krait_cpu_clks, cpu)); -+ max_cpu_freq = max(max_cpu_freq, freq); -+ } -+ -+ for (i = 0; i < nr_krait_l2_points; i++) { -+ if (max_cpu_freq >= krait_l2_points[i].cpu_freq) { -+ if (krait_l2_reg) { -+ ret = regulator_set_voltage_tol(krait_l2_reg, -+ krait_l2_points[i].cache_volt, -+ tol); -+ if (ret) { -+ pr_err("failed to scale l2 voltage: %d\n", -+ ret); -+ } -+ } -+ ret = clk_set_rate(krait_l2_clk, -+ krait_l2_points[i].cache_freq); -+ if (ret) -+ pr_err("failed to scale l2 clk: %d\n", ret); -+ break; -+ } -+ -+ } -+ -+ return ret; -+} -+ -+static int krait_cpufreq_init(struct cpufreq_policy *policy) -+{ -+ int ret; -+ -+ policy->clk = per_cpu(krait_cpu_clks, policy->cpu); -+ -+ ret = cpufreq_table_validate_and_show(policy, freq_table); -+ if (ret) { -+ pr_err("%s: invalid frequency table: %d\n", __func__, ret); -+ return ret; -+ } -+ -+ policy->cpuinfo.transition_latency = transition_latency; -+ -+ return 0; -+} -+ -+static struct cpufreq_driver krait_cpufreq_driver = { -+ .flags = CPUFREQ_STICKY, -+ .verify = cpufreq_generic_frequency_table_verify, -+ .target_index = krait_set_target, -+ .get = cpufreq_generic_get, -+ .init = krait_cpufreq_init, -+ .name = "generic_krait", -+ .attr = cpufreq_generic_attr, -+}; -+ -+static int krait_cpufreq_probe(struct platform_device *pdev) -+{ -+ struct device_node *np, *cache; -+ int ret, i; -+ unsigned int cpu; -+ struct device *dev; -+ struct clk *clk; -+ struct regulator *core; -+ unsigned long freq_Hz, freq, max_cpu_freq = 0; -+ struct dev_pm_opp *opp; -+ unsigned long volt, tol; -+ -+ cpu_dev = get_cpu_device(0); -+ if (!cpu_dev) { -+ pr_err("failed to get krait device\n"); -+ return -ENODEV; -+ } -+ -+ np = of_node_get(cpu_dev->of_node); -+ if (!np) { -+ pr_err("failed to find krait node\n"); -+ return -ENOENT; -+ } -+ -+ ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table); -+ if (ret) { -+ pr_err("failed to init cpufreq table: %d\n", ret); -+ goto out_put_node; -+ } -+ -+ of_property_read_u32(np, "voltage-tolerance", &voltage_tolerance); -+ -+ if (of_property_read_u32(np, "clock-latency", &transition_latency)) -+ transition_latency = CPUFREQ_ETERNAL; -+ -+ cache = of_find_next_cache_node(np); -+ if (cache) { -+ struct device_node *vdd; -+ -+ vdd = of_parse_phandle(cache, "vdd_dig-supply", 0); -+ if (vdd) { -+ krait_l2_reg = regulator_get(NULL, vdd->name); -+ if (IS_ERR(krait_l2_reg)) { -+ pr_warn("failed to get l2 vdd_dig supply\n"); -+ krait_l2_reg = NULL; -+ } -+ of_node_put(vdd); -+ } -+ -+ krait_l2_clk = of_clk_get(cache, 0); -+ if (!IS_ERR(krait_l2_clk)) { -+ ret = krait_parse_cache_points(&pdev->dev, cache); -+ if (ret) -+ clk_put(krait_l2_clk); -+ } -+ if (IS_ERR(krait_l2_clk) || ret) -+ krait_l2_clk = NULL; -+ } -+ -+ for_each_possible_cpu(cpu) { -+ dev = get_cpu_device(cpu); -+ if (!dev) { -+ pr_err("failed to get krait device\n"); -+ ret = -ENOENT; -+ goto out_free_table; -+ } -+ per_cpu(krait_cpu_clks, cpu) = clk = devm_clk_get(dev, NULL); -+ if (IS_ERR(clk)) { -+ ret = PTR_ERR(clk); -+ goto out_free_table; -+ } -+ core = devm_regulator_get(dev, "core"); -+ if (IS_ERR(core)) { -+ pr_debug("failed to get core regulator\n"); -+ ret = PTR_ERR(core); -+ goto out_free_table; -+ } -+ per_cpu(krait_supply_core, cpu) = core; -+ -+ freq = freq_Hz = clk_get_rate(clk); -+ -+ rcu_read_lock(); -+ opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_Hz); -+ if (IS_ERR(opp)) { -+ rcu_read_unlock(); -+ pr_err("failed to find OPP for %ld\n", freq_Hz); -+ ret = PTR_ERR(opp); -+ goto out_free_table; -+ } -+ volt = dev_pm_opp_get_voltage(opp); -+ rcu_read_unlock(); -+ -+ tol = volt * voltage_tolerance / 100; -+ ret = regulator_set_voltage_tol(core, volt, tol); -+ if (ret) { -+ pr_err("failed to scale voltage up: %d\n", ret); -+ goto out_free_table; -+ } -+ ret = regulator_enable(core); -+ if (ret) { -+ pr_err("failed to enable regulator: %d\n", ret); -+ goto out_free_table; -+ } -+ max_cpu_freq = max(max_cpu_freq, freq); -+ } -+ -+ for (i = 0; i < nr_krait_l2_points; i++) { -+ if (max_cpu_freq >= krait_l2_points[i].cpu_freq) { -+ if (krait_l2_reg) { -+ ret = regulator_set_voltage_tol(krait_l2_reg, -+ krait_l2_points[i].cache_volt, -+ tol); -+ if (ret) -+ pr_err("failed to scale l2 voltage: %d\n", -+ ret); -+ ret = regulator_enable(krait_l2_reg); -+ if (ret) -+ pr_err("failed to enable l2 voltage: %d\n", -+ ret); -+ } -+ break; -+ } -+ -+ } -+ -+ ret = cpufreq_register_driver(&krait_cpufreq_driver); -+ if (ret) { -+ pr_err("failed register driver: %d\n", ret); -+ goto out_free_table; -+ } -+ of_node_put(np); -+ -+ /* -+ * For now, just loading the cooling device; -+ * thermal DT code takes care of matching them. -+ */ -+ for_each_possible_cpu(cpu) { -+ dev = get_cpu_device(cpu); -+ np = of_node_get(dev->of_node); -+ if (of_find_property(np, "#cooling-cells", NULL)) { -+ cdev = of_cpufreq_cooling_register(np, cpumask_of(cpu)); -+ if (IS_ERR(cdev)) -+ pr_err("running cpufreq without cooling device: %ld\n", -+ PTR_ERR(cdev)); -+ } -+ of_node_put(np); -+ } -+ -+ return 0; -+ -+out_free_table: -+ regulator_put(krait_l2_reg); -+ clk_put(krait_l2_clk); -+ dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table); -+out_put_node: -+ of_node_put(np); -+ return ret; -+} -+ -+static int krait_cpufreq_remove(struct platform_device *pdev) -+{ -+ cpufreq_cooling_unregister(cdev); -+ cpufreq_unregister_driver(&krait_cpufreq_driver); -+ dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table); -+ clk_put(krait_l2_clk); -+ regulator_put(krait_l2_reg); -+ -+ return 0; -+} -+ -+static struct platform_driver krait_cpufreq_platdrv = { -+ .driver = { -+ .name = "cpufreq-krait", -+ .owner = THIS_MODULE, -+ }, -+ .probe = krait_cpufreq_probe, -+ .remove = krait_cpufreq_remove, -+}; -+module_platform_driver(krait_cpufreq_platdrv); -+ -+MODULE_DESCRIPTION("Krait CPUfreq driver"); -+MODULE_LICENSE("GPL v2"); ---- a/drivers/cpufreq/qcom-cpufreq.c -+++ b/drivers/cpufreq/qcom-cpufreq.c -@@ -168,11 +168,8 @@ static int __init qcom_cpufreq_populate_ - - static int __init qcom_cpufreq_driver_init(void) - { -- struct cpufreq_dt_platform_data pdata = { .independent_clocks = true }; - struct platform_device_info devinfo = { -- .name = "cpufreq-dt", -- .data = &pdata, -- .size_data = sizeof(pdata), -+ .name = "cpufreq-krait", - }; - struct device *cpu_dev; - struct device_node *np; diff --git a/target/linux/ipq806x/patches-4.4/172-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch b/target/linux/ipq806x/patches-4.4/172-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch new file mode 100644 index 0000000000..60ebe13b1b --- /dev/null +++ b/target/linux/ipq806x/patches-4.4/172-cpufreq-dt-Handle-OPP-voltage-adjust-events.patch @@ -0,0 +1,184 @@ +From 175329015c8a0b480240da222822d2f8316f074d Mon Sep 17 00:00:00 2001 +From: Stephen Boyd +Date: Mon, 1 Jun 2015 18:47:58 -0700 +Subject: cpufreq-dt: Handle OPP voltage adjust events + +On some SoCs the Adaptive Voltage Scaling (AVS) technique is +employed to optimize the operating voltage of a device. At a +given frequency, the hardware monitors dynamic factors and either +makes a suggestion for how much to adjust a voltage for the +current frequency, or it automatically adjusts the voltage +without software intervention. + +In the former case, an AVS driver will call +dev_pm_opp_modify_voltage() and update the voltage for the +particular OPP the CPUs are using. Add an OPP notifier to +cpufreq-dt so that we can adjust the voltage of the CPU when AVS +updates the OPP. + +Signed-off-by: Stephen Boyd +--- + drivers/cpufreq/cpufreq-dt.c | 72 ++++++++++++++++++++++++++++++++++++++++---- + 1 file changed, 66 insertions(+), 6 deletions(-) + +--- a/drivers/cpufreq/cpufreq-dt.c ++++ b/drivers/cpufreq/cpufreq-dt.c +@@ -34,6 +34,9 @@ struct private_data { + struct regulator *cpu_reg; + struct thermal_cooling_device *cdev; + unsigned int voltage_tolerance; /* in percentage */ ++ struct notifier_block opp_nb; ++ struct mutex lock; ++ unsigned long opp_freq; + }; + + static struct freq_attr *cpufreq_dt_attr[] = { +@@ -42,6 +45,42 @@ static struct freq_attr *cpufreq_dt_attr + NULL, + }; + ++static int opp_notifier(struct notifier_block *nb, unsigned long event, ++ void *data) ++{ ++ struct dev_pm_opp *opp = data; ++ struct private_data *priv = container_of(nb, struct private_data, ++ opp_nb); ++ struct device *cpu_dev = priv->cpu_dev; ++ struct regulator *cpu_reg = priv->cpu_reg; ++ unsigned long volt, tol, freq; ++ int ret = 0; ++ ++ switch (event) { ++ case OPP_EVENT_ADJUST_VOLTAGE: ++ volt = dev_pm_opp_get_voltage(opp); ++ freq = dev_pm_opp_get_freq(opp); ++ tol = volt * priv->voltage_tolerance / 100; ++ ++ mutex_lock(&priv->lock); ++ if (freq == priv->opp_freq) ++ ret = regulator_set_voltage_tol(cpu_reg, volt, ++ tol); ++ mutex_unlock(&priv->lock); ++ if (ret) { ++ dev_err(cpu_dev, ++ "failed to scale voltage up: %d\n", ++ ret); ++ return ret; ++ } ++ break; ++ default: ++ break; ++ } ++ ++ return 0; ++} ++ + static int set_target(struct cpufreq_policy *policy, unsigned int index) + { + struct dev_pm_opp *opp; +@@ -53,6 +92,7 @@ static int set_target(struct cpufreq_pol + unsigned long volt = 0, volt_old = 0, tol = 0; + unsigned int old_freq, new_freq; + long freq_Hz, freq_exact; ++ unsigned long opp_freq = 0; + int ret; + + freq_Hz = clk_round_rate(cpu_clk, freq_table[index].frequency * 1000); +@@ -63,8 +103,8 @@ static int set_target(struct cpufreq_pol + new_freq = freq_Hz / 1000; + old_freq = clk_get_rate(cpu_clk) / 1000; + ++ mutex_lock(&priv->lock); + if (!IS_ERR(cpu_reg)) { +- unsigned long opp_freq; + + rcu_read_lock(); + opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_Hz); +@@ -72,7 +112,8 @@ static int set_target(struct cpufreq_pol + rcu_read_unlock(); + dev_err(cpu_dev, "failed to find OPP for %ld\n", + freq_Hz); +- return PTR_ERR(opp); ++ ret = PTR_ERR(opp); ++ goto out; + } + volt = dev_pm_opp_get_voltage(opp); + opp_freq = dev_pm_opp_get_freq(opp); +@@ -93,7 +134,7 @@ static int set_target(struct cpufreq_pol + if (ret) { + dev_err(cpu_dev, "failed to scale voltage up: %d\n", + ret); +- return ret; ++ goto out; + } + } + +@@ -102,7 +143,7 @@ static int set_target(struct cpufreq_pol + dev_err(cpu_dev, "failed to set clock rate: %d\n", ret); + if (!IS_ERR(cpu_reg) && volt_old > 0) + regulator_set_voltage_tol(cpu_reg, volt_old, tol); +- return ret; ++ goto out; + } + + /* scaling down? scale voltage after frequency */ +@@ -112,9 +153,12 @@ static int set_target(struct cpufreq_pol + dev_err(cpu_dev, "failed to scale voltage down: %d\n", + ret); + clk_set_rate(cpu_clk, old_freq * 1000); ++ goto out; + } + } +- ++ priv->opp_freq = opp_freq; ++out: ++ mutex_unlock(&priv->lock); + return ret; + } + +@@ -201,6 +245,7 @@ static int cpufreq_init(struct cpufreq_p + unsigned int transition_latency; + bool need_update = false; + int ret; ++ struct srcu_notifier_head *opp_srcu_head; + + ret = allocate_resources(policy->cpu, &cpu_dev, &cpu_reg, &cpu_clk); + if (ret) { +@@ -277,6 +322,19 @@ static int cpufreq_init(struct cpufreq_p + goto out_free_opp; + } + ++ mutex_init(&priv->lock); ++ ++ opp_srcu_head = dev_pm_opp_get_notifier(cpu_dev); ++ if (IS_ERR(opp_srcu_head)) { ++ ret = PTR_ERR(opp_srcu_head); ++ goto out_free_priv; ++ } ++ ++ priv->opp_nb.notifier_call = opp_notifier; ++ ret = srcu_notifier_chain_register(opp_srcu_head, &priv->opp_nb); ++ if (ret) ++ goto out_free_priv; ++ + of_property_read_u32(np, "voltage-tolerance", &priv->voltage_tolerance); + + if (!transition_latency) +@@ -326,7 +384,7 @@ static int cpufreq_init(struct cpufreq_p + ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table); + if (ret) { + pr_err("failed to init cpufreq table: %d\n", ret); +- goto out_free_priv; ++ goto out_unregister_nb; + } + + priv->cpu_dev = cpu_dev; +@@ -365,6 +423,8 @@ static int cpufreq_init(struct cpufreq_p + + out_free_cpufreq_table: + dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table); ++out_unregister_nb: ++ srcu_notifier_chain_unregister(opp_srcu_head, &priv->opp_nb); + out_free_priv: + kfree(priv); + out_free_opp: diff --git a/target/linux/ipq806x/patches-4.4/173-cpufreq-dt-Add-L2-frequency-scaling-support.patch b/target/linux/ipq806x/patches-4.4/173-cpufreq-dt-Add-L2-frequency-scaling-support.patch new file mode 100644 index 0000000000..56930520c9 --- /dev/null +++ b/target/linux/ipq806x/patches-4.4/173-cpufreq-dt-Add-L2-frequency-scaling-support.patch @@ -0,0 +1,161 @@ +From b4629f9e30e865402c643de6d4668be790fc0539 Mon Sep 17 00:00:00 2001 +From: Georgi Djakov +Date: Tue, 8 Sep 2015 11:24:41 +0300 +Subject: cpufreq-dt: Add L2 frequency scaling support + +Signed-off-by: Georgi Djakov + +Conflicts: + drivers/cpufreq/cpufreq-dt.c +--- + drivers/cpufreq/cpufreq-dt.c | 54 ++++++++++++++++++++++++++++++++++++++------ + include/linux/cpufreq.h | 2 ++ + 2 files changed, 49 insertions(+), 7 deletions(-) + +--- a/drivers/cpufreq/cpufreq-dt.c ++++ b/drivers/cpufreq/cpufreq-dt.c +@@ -86,11 +86,13 @@ static int set_target(struct cpufreq_pol + struct dev_pm_opp *opp; + struct cpufreq_frequency_table *freq_table = policy->freq_table; + struct clk *cpu_clk = policy->clk; ++ struct clk *l2_clk = policy->l2_clk; + struct private_data *priv = policy->driver_data; + struct device *cpu_dev = priv->cpu_dev; + struct regulator *cpu_reg = priv->cpu_reg; + unsigned long volt = 0, volt_old = 0, tol = 0; +- unsigned int old_freq, new_freq; ++ unsigned int old_freq, new_freq, l2_freq; ++ unsigned long new_l2_freq = 0; + long freq_Hz, freq_exact; + unsigned long opp_freq = 0; + int ret; +@@ -146,6 +148,30 @@ static int set_target(struct cpufreq_pol + goto out; + } + ++ if (!IS_ERR(l2_clk) && policy->l2_rate[0] && policy->l2_rate[1] && ++ policy->l2_rate[2]) { ++ static unsigned long krait_l2[CONFIG_NR_CPUS] = { }; ++ int cpu, ret = 0; ++ ++ if (freq_exact >= policy->l2_rate[2]) ++ new_l2_freq = policy->l2_rate[2]; ++ else if (freq_exact >= policy->l2_rate[1]) ++ new_l2_freq = policy->l2_rate[1]; ++ else ++ new_l2_freq = policy->l2_rate[0]; ++ ++ krait_l2[policy->cpu] = new_l2_freq; ++ for_each_present_cpu(cpu) ++ new_l2_freq = max(new_l2_freq, krait_l2[cpu]); ++ ++ l2_freq = clk_get_rate(l2_clk); ++ ++ if (l2_freq != new_l2_freq) { ++ /* scale l2 with the core */ ++ ret = clk_set_rate(l2_clk, new_l2_freq); ++ } ++ } ++ + /* scaling down? scale voltage after frequency */ + if (!IS_ERR(cpu_reg) && new_freq < old_freq) { + ret = regulator_set_voltage_tol(cpu_reg, volt, tol); +@@ -156,18 +182,21 @@ static int set_target(struct cpufreq_pol + goto out; + } + } ++ + priv->opp_freq = opp_freq; ++ + out: + mutex_unlock(&priv->lock); + return ret; + } + + static int allocate_resources(int cpu, struct device **cdev, +- struct regulator **creg, struct clk **cclk) ++ struct regulator **creg, struct clk **cclk, ++ struct clk **l2) + { + struct device *cpu_dev; + struct regulator *cpu_reg; +- struct clk *cpu_clk; ++ struct clk *cpu_clk, *l2_clk = NULL; + int ret = 0; + char *reg_cpu0 = "cpu0", *reg_cpu = "cpu", *reg; + +@@ -227,6 +256,10 @@ try_again: + *cdev = cpu_dev; + *creg = cpu_reg; + *cclk = cpu_clk; ++ ++ l2_clk = clk_get(cpu_dev, "l2"); ++ if (!IS_ERR(l2_clk)) ++ *l2 = l2_clk; + } + + return ret; +@@ -236,18 +269,20 @@ static int cpufreq_init(struct cpufreq_p + { + struct cpufreq_frequency_table *freq_table; + struct device_node *np; ++ struct device_node *l2_np; + struct private_data *priv; + struct device *cpu_dev; + struct regulator *cpu_reg; +- struct clk *cpu_clk; + struct dev_pm_opp *suspend_opp; ++ struct clk *cpu_clk, *l2_clk; + unsigned long min_uV = ~0, max_uV = 0; + unsigned int transition_latency; + bool need_update = false; + int ret; + struct srcu_notifier_head *opp_srcu_head; + +- ret = allocate_resources(policy->cpu, &cpu_dev, &cpu_reg, &cpu_clk); ++ ret = allocate_resources(policy->cpu, &cpu_dev, &cpu_reg, &cpu_clk, ++ &l2_clk); + if (ret) { + pr_err("%s: Failed to allocate resources: %d\n", __func__, ret); + return ret; +@@ -398,6 +433,11 @@ static int cpufreq_init(struct cpufreq_p + if (suspend_opp) + policy->suspend_freq = dev_pm_opp_get_freq(suspend_opp) / 1000; + rcu_read_unlock(); ++ policy->l2_clk = l2_clk; ++ ++ l2_np = of_find_node_by_name(NULL, "qcom,l2"); ++ if (l2_np) ++ of_property_read_u32_array(l2_np, "qcom,l2-rates", policy->l2_rate, 3); + + ret = cpufreq_table_validate_and_show(policy, freq_table); + if (ret) { +@@ -498,7 +538,7 @@ static int dt_cpufreq_probe(struct platf + { + struct device *cpu_dev; + struct regulator *cpu_reg; +- struct clk *cpu_clk; ++ struct clk *cpu_clk, *l2_clk; + int ret; + + /* +@@ -508,7 +548,7 @@ static int dt_cpufreq_probe(struct platf + * + * FIXME: Is checking this only for CPU0 sufficient ? + */ +- ret = allocate_resources(0, &cpu_dev, &cpu_reg, &cpu_clk); ++ ret = allocate_resources(0, &cpu_dev, &cpu_reg, &cpu_clk, &l2_clk); + if (ret) + return ret; + +--- a/include/linux/cpufreq.h ++++ b/include/linux/cpufreq.h +@@ -67,6 +67,8 @@ struct cpufreq_policy { + unsigned int cpu; /* cpu managing this policy, must be online */ + + struct clk *clk; ++ struct clk *l2_clk; /* L2 clock */ ++ unsigned int l2_rate[3]; /* L2 bus clock rate thresholds */ + struct cpufreq_cpuinfo cpuinfo;/* see above */ + + unsigned int min; /* in kHz */ diff --git a/target/linux/ipq806x/patches-4.4/174-cpufreq-dt-Add-missing-rcu_read_lock-for-find_device_opp.patch b/target/linux/ipq806x/patches-4.4/174-cpufreq-dt-Add-missing-rcu_read_lock-for-find_device_opp.patch new file mode 100644 index 0000000000..124272154f --- /dev/null +++ b/target/linux/ipq806x/patches-4.4/174-cpufreq-dt-Add-missing-rcu_read_lock-for-find_device_opp.patch @@ -0,0 +1,33 @@ +From dafae9c5b39e2871bfd8db0b4bad6e850e42ef49 Mon Sep 17 00:00:00 2001 +From: Georgi Djakov +Date: Wed, 13 Jan 2016 15:10:25 +0200 +Subject: cpufreq-dt: Add missing rcu_read_lock() for find_device_opp() + +The function dev_pm_opp_get_notifier() must be called with held +rcu_read_lock. In order to keep the pointer valid, add rcu_read_lock(). + +Signed-off-by: Georgi Djakov +--- + drivers/cpufreq/cpufreq-dt.c | 3 +++ + 1 file changed, 3 insertions(+) + +--- a/drivers/cpufreq/cpufreq-dt.c ++++ b/drivers/cpufreq/cpufreq-dt.c +@@ -359,14 +359,17 @@ static int cpufreq_init(struct cpufreq_p + + mutex_init(&priv->lock); + ++ rcu_read_lock(); + opp_srcu_head = dev_pm_opp_get_notifier(cpu_dev); + if (IS_ERR(opp_srcu_head)) { + ret = PTR_ERR(opp_srcu_head); ++ rcu_read_unlock(); + goto out_free_priv; + } + + priv->opp_nb.notifier_call = opp_notifier; + ret = srcu_notifier_chain_register(opp_srcu_head, &priv->opp_nb); ++ rcu_read_unlock(); + if (ret) + goto out_free_priv; +