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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 <be.dissent@gmail.com>
This commit is contained in:
Pavel Kubelun
John Crispin
parent
a154a3d8be
commit
681f28990d
@ -77,7 +77,7 @@ CONFIG_COMMON_CLK=y
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CONFIG_COMMON_CLK_QCOM=y
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CONFIG_COMMON_CLK_QCOM=y
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CONFIG_COMPACTION=y
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CONFIG_COMPACTION=y
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CONFIG_COREDUMP=y
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CONFIG_COREDUMP=y
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# CONFIG_CPUFREQ_DT is not set
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CONFIG_CPUFREQ_DT=y
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CONFIG_CPU_32v6K=y
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CONFIG_CPU_32v6K=y
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CONFIG_CPU_32v7=y
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CONFIG_CPU_32v7=y
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CONFIG_CPU_ABRT_EV7=y
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CONFIG_CPU_ABRT_EV7=y
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@ -89,7 +89,8 @@ CONFIG_CPU_COPY_V6=y
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CONFIG_CPU_CP15=y
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CONFIG_CPU_CP15=y
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CONFIG_CPU_CP15_MMU=y
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CONFIG_CPU_CP15_MMU=y
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CONFIG_CPU_FREQ=y
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CONFIG_CPU_FREQ=y
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CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
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# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
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CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
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CONFIG_CPU_FREQ_GOV_COMMON=y
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CONFIG_CPU_FREQ_GOV_COMMON=y
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# CONFIG_CPU_FREQ_GOV_CONSERVATIVE is not set
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# CONFIG_CPU_FREQ_GOV_CONSERVATIVE is not set
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CONFIG_CPU_FREQ_GOV_ONDEMAND=y
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CONFIG_CPU_FREQ_GOV_ONDEMAND=y
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@ -105,7 +106,7 @@ CONFIG_CPU_IDLE_GOV_MENU=y
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CONFIG_CPU_PABRT_V7=y
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CONFIG_CPU_PABRT_V7=y
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CONFIG_CPU_PM=y
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CONFIG_CPU_PM=y
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CONFIG_CPU_RMAP=y
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CONFIG_CPU_RMAP=y
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# CONFIG_CPU_THERMAL is not set
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CONFIG_CPU_THERMAL=y
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CONFIG_CPU_TLB_V7=y
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CONFIG_CPU_TLB_V7=y
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CONFIG_CPU_V7=y
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CONFIG_CPU_V7=y
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CONFIG_CRC16=y
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CONFIG_CRC16=y
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@ -146,7 +147,6 @@ CONFIG_GENERIC_ALLOCATOR=y
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CONFIG_GENERIC_BUG=y
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CONFIG_GENERIC_BUG=y
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CONFIG_GENERIC_CLOCKEVENTS=y
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CONFIG_GENERIC_CLOCKEVENTS=y
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CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y
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CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y
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CONFIG_GENERIC_CPUFREQ_KRAIT=y
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CONFIG_GENERIC_IDLE_POLL_SETUP=y
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CONFIG_GENERIC_IDLE_POLL_SETUP=y
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CONFIG_GENERIC_IO=y
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CONFIG_GENERIC_IO=y
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CONFIG_GENERIC_IRQ_SHOW=y
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CONFIG_GENERIC_IRQ_SHOW=y
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@ -378,7 +378,7 @@ CONFIG_QCOM_BAM_DMA=y
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CONFIG_QCOM_GDSC=y
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CONFIG_QCOM_GDSC=y
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CONFIG_QCOM_GSBI=y
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CONFIG_QCOM_GSBI=y
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CONFIG_QCOM_HFPLL=y
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CONFIG_QCOM_HFPLL=y
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# CONFIG_QCOM_PM is not set
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CONFIG_QCOM_PM=y
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CONFIG_QCOM_QFPROM=y
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CONFIG_QCOM_QFPROM=y
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CONFIG_QCOM_SCM=y
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CONFIG_QCOM_SCM=y
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CONFIG_QCOM_SCM_32=y
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CONFIG_QCOM_SCM_32=y
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@ -1,461 +0,0 @@
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From dd77db4143290689d3a5e1ec61627233d0711b66 Mon Sep 17 00:00:00 2001
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From: Stephen Boyd <sboyd@codeaurora.org>
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Date: Fri, 30 May 2014 16:36:11 -0700
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Subject: [PATCH] FROMLIST: cpufreq: Add a cpufreq-krait based on cpufreq-cpu0
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Krait processors have individual clocks for each CPU that can
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scale independently from one another. cpufreq-cpu0 is fairly
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close to this, but assumes that there is only one clock for all
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CPUs. Add a driver to support the Krait configuration.
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TODO: Merge into cpufreq-cpu0? Or make generic?
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Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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---
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drivers/cpufreq/Kconfig | 13 +++
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drivers/cpufreq/Makefile | 1 +
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drivers/cpufreq/cpufreq-krait.c | 190 ++++++++++++++++++++++++++++++++++++++++
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3 files changed, 204 insertions(+)
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create mode 100644 drivers/cpufreq/cpufreq-krait.c
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--- a/drivers/cpufreq/Kconfig
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+++ b/drivers/cpufreq/Kconfig
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@@ -198,6 +198,19 @@ config CPUFREQ_DT
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If in doubt, say N.
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+config GENERIC_CPUFREQ_KRAIT
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+ tristate "Krait cpufreq driver"
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+ depends on HAVE_CLK && OF
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+ # if CPU_THERMAL is on and THERMAL=m, CPU0 cannot be =y:
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+ depends on !CPU_THERMAL || THERMAL
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+ select PM_OPP
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+ help
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+ This adds a generic cpufreq driver for CPU0 frequency management.
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+ It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
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+ systems which share clock and voltage across all CPUs.
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+
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+ If in doubt, say N.
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+
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if X86
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source "drivers/cpufreq/Kconfig.x86"
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endif
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--- a/drivers/cpufreq/Makefile
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+++ b/drivers/cpufreq/Makefile
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@@ -13,6 +13,7 @@ obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE)
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obj-$(CONFIG_CPU_FREQ_GOV_COMMON) += cpufreq_governor.o
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obj-$(CONFIG_CPUFREQ_DT) += cpufreq-dt.o
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+obj-$(CONFIG_GENERIC_CPUFREQ_KRAIT) += cpufreq-krait.o
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##################################################################################
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# x86 drivers.
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--- /dev/null
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+++ b/drivers/cpufreq/cpufreq-krait.c
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@@ -0,0 +1,390 @@
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+/*
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+ * Copyright (C) 2012 Freescale Semiconductor, Inc.
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+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
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+ *
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+ * The OPP code in function krait_set_target() is reused from
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+ * drivers/cpufreq/omap-cpufreq.c
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/clk.h>
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+#include <linux/cpu.h>
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+#include <linux/cpu_cooling.h>
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+#include <linux/cpufreq.h>
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+#include <linux/cpumask.h>
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+#include <linux/err.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/pm_opp.h>
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+#include <linux/platform_device.h>
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+#include <linux/regulator/consumer.h>
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+#include <linux/slab.h>
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+#include <linux/thermal.h>
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+
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+static unsigned int transition_latency;
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+static unsigned int voltage_tolerance; /* in percentage */
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+
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+static struct device *cpu_dev;
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+static DEFINE_PER_CPU(struct clk *, krait_cpu_clks);
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+static DEFINE_PER_CPU(struct regulator *, krait_supply_core);
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+static struct cpufreq_frequency_table *freq_table;
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+static struct thermal_cooling_device *cdev;
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+
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+struct cache_points {
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+ unsigned long cache_freq;
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+ unsigned int cache_volt;
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+ unsigned long cpu_freq;
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+};
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+
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+static struct regulator *krait_l2_reg;
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+static struct clk *krait_l2_clk;
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+static struct cache_points *krait_l2_points;
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+static int nr_krait_l2_points;
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+
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+static int krait_parse_cache_points(struct device *dev,
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+ struct device_node *of_node)
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+{
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+ const struct property *prop;
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+ const __be32 *val;
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+ int nr, i;
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+
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+ prop = of_find_property(of_node, "cache-points-kHz", NULL);
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+ if (!prop)
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+ return -ENODEV;
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+ if (!prop->value)
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+ return -ENODATA;
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+
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+ /*
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+ * Each OPP is a set of tuples consisting of frequency and
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+ * cpu-frequency like <freq-kHz volt-uV freq-kHz>.
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+ */
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+ nr = prop->length / sizeof(u32);
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+ if (nr % 3) {
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+ dev_err(dev, "%s: Invalid cache points\n", __func__);
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+ return -EINVAL;
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+ }
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+ nr /= 3;
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+
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+ krait_l2_points = devm_kcalloc(dev, nr, sizeof(*krait_l2_points),
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+ GFP_KERNEL);
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+ if (!krait_l2_points)
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+ return -ENOMEM;
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+ nr_krait_l2_points = nr;
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+
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+ for (i = 0, val = prop->value; i < nr; i++) {
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+ unsigned long cache_freq = be32_to_cpup(val++) * 1000;
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+ unsigned int cache_volt = be32_to_cpup(val++);
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+ unsigned long cpu_freq = be32_to_cpup(val++) * 1000;
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+
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+ krait_l2_points[i].cache_freq = cache_freq;
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+ krait_l2_points[i].cache_volt = cache_volt;
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+ krait_l2_points[i].cpu_freq = cpu_freq;
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+ }
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+
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+ return 0;
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+}
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+
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+static int krait_set_target(struct cpufreq_policy *policy, unsigned int index)
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+{
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+ struct dev_pm_opp *opp;
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+ unsigned long volt = 0, volt_old = 0, tol = 0;
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+ unsigned long freq, max_cpu_freq = 0;
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+ unsigned int old_freq, new_freq;
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+ long freq_Hz, freq_exact;
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+ int ret, i;
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+ struct clk *cpu_clk;
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+ struct regulator *core;
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+ unsigned int cpu;
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+
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+ cpu_clk = per_cpu(krait_cpu_clks, policy->cpu);
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+
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+ freq_Hz = clk_round_rate(cpu_clk, freq_table[index].frequency * 1000);
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+ if (freq_Hz <= 0)
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+ freq_Hz = freq_table[index].frequency * 1000;
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+
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+ freq_exact = freq_Hz;
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+ new_freq = freq_Hz / 1000;
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+ old_freq = clk_get_rate(cpu_clk) / 1000;
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+
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+ core = per_cpu(krait_supply_core, policy->cpu);
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+
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+ rcu_read_lock();
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+ opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_Hz);
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+ if (IS_ERR(opp)) {
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+ rcu_read_unlock();
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+ pr_err("failed to find OPP for %ld\n", freq_Hz);
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+ return PTR_ERR(opp);
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+ }
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+ volt = dev_pm_opp_get_voltage(opp);
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+ rcu_read_unlock();
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+ tol = volt * voltage_tolerance / 100;
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+ volt_old = regulator_get_voltage(core);
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+
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+ pr_debug("%u MHz, %ld mV --> %u MHz, %ld mV\n",
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+ old_freq / 1000, volt_old ? volt_old / 1000 : -1,
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+ new_freq / 1000, volt ? volt / 1000 : -1);
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+
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+ /* scaling up? scale voltage before frequency */
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+ if (new_freq > old_freq) {
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+ ret = regulator_set_voltage_tol(core, volt, tol);
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+ if (ret) {
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+ pr_err("failed to scale voltage up: %d\n", ret);
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+ return ret;
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+ }
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+ }
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+
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+ ret = clk_set_rate(cpu_clk, freq_exact);
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+ if (ret) {
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+ pr_err("failed to set clock rate: %d\n", ret);
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+ return ret;
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+ }
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+
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+ /* scaling down? scale voltage after frequency */
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+ if (new_freq < old_freq) {
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+ ret = regulator_set_voltage_tol(core, volt, tol);
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+ if (ret) {
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+ pr_err("failed to scale voltage down: %d\n", ret);
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+ clk_set_rate(cpu_clk, old_freq * 1000);
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+ }
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+ }
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+
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+ for_each_possible_cpu(cpu) {
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+ freq = clk_get_rate(per_cpu(krait_cpu_clks, cpu));
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+ max_cpu_freq = max(max_cpu_freq, freq);
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+ }
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+
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+ for (i = 0; i < nr_krait_l2_points; i++) {
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+ if (max_cpu_freq >= krait_l2_points[i].cpu_freq) {
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+ if (krait_l2_reg) {
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+ ret = regulator_set_voltage_tol(krait_l2_reg,
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+ krait_l2_points[i].cache_volt,
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+ tol);
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+ if (ret) {
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+ pr_err("failed to scale l2 voltage: %d\n",
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+ ret);
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+ }
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+ }
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+ ret = clk_set_rate(krait_l2_clk,
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+ krait_l2_points[i].cache_freq);
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+ if (ret)
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+ pr_err("failed to scale l2 clk: %d\n", ret);
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+ break;
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+ }
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+
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+ }
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+
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+ return ret;
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+}
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+
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+static int krait_cpufreq_init(struct cpufreq_policy *policy)
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+{
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+ int ret;
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+
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+ policy->clk = per_cpu(krait_cpu_clks, policy->cpu);
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+
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+ ret = cpufreq_table_validate_and_show(policy, freq_table);
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+ if (ret) {
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+ pr_err("%s: invalid frequency table: %d\n", __func__, ret);
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+ return ret;
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+ }
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+
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+ policy->cpuinfo.transition_latency = transition_latency;
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+
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+ return 0;
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+}
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+
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+static struct cpufreq_driver krait_cpufreq_driver = {
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+ .flags = CPUFREQ_STICKY,
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+ .verify = cpufreq_generic_frequency_table_verify,
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+ .target_index = krait_set_target,
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+ .get = cpufreq_generic_get,
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+ .init = krait_cpufreq_init,
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+ .name = "generic_krait",
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+ .attr = cpufreq_generic_attr,
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+};
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+
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+static int krait_cpufreq_probe(struct platform_device *pdev)
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+{
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+ struct device_node *np, *cache;
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+ int ret, i;
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+ unsigned int cpu;
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+ struct device *dev;
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+ struct clk *clk;
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+ struct regulator *core;
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+ unsigned long freq_Hz, freq, max_cpu_freq = 0;
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+ struct dev_pm_opp *opp;
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+ unsigned long volt, tol;
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+
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+ cpu_dev = get_cpu_device(0);
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+ if (!cpu_dev) {
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+ pr_err("failed to get krait device\n");
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+ return -ENODEV;
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+ }
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+
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+ np = of_node_get(cpu_dev->of_node);
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+ if (!np) {
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+ pr_err("failed to find krait node\n");
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+ return -ENOENT;
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+ }
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+
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|
||||||
+ 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;
|
|
||||||
@ -0,0 +1,184 @@
|
|||||||
|
From 175329015c8a0b480240da222822d2f8316f074d Mon Sep 17 00:00:00 2001
|
||||||
|
From: Stephen Boyd <sboyd@codeaurora.org>
|
||||||
|
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 <sboyd@codeaurora.org>
|
||||||
|
---
|
||||||
|
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:
|
||||||
@ -0,0 +1,161 @@
|
|||||||
|
From b4629f9e30e865402c643de6d4668be790fc0539 Mon Sep 17 00:00:00 2001
|
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From: Georgi Djakov <georgi.djakov@linaro.org>
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Date: Tue, 8 Sep 2015 11:24:41 +0300
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Subject: cpufreq-dt: Add L2 frequency scaling support
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Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
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Conflicts:
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drivers/cpufreq/cpufreq-dt.c
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---
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drivers/cpufreq/cpufreq-dt.c | 54 ++++++++++++++++++++++++++++++++++++++------
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include/linux/cpufreq.h | 2 ++
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2 files changed, 49 insertions(+), 7 deletions(-)
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--- a/drivers/cpufreq/cpufreq-dt.c
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+++ b/drivers/cpufreq/cpufreq-dt.c
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@@ -86,11 +86,13 @@ static int set_target(struct cpufreq_pol
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struct dev_pm_opp *opp;
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struct cpufreq_frequency_table *freq_table = policy->freq_table;
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struct clk *cpu_clk = policy->clk;
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+ struct clk *l2_clk = policy->l2_clk;
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struct private_data *priv = policy->driver_data;
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struct device *cpu_dev = priv->cpu_dev;
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struct regulator *cpu_reg = priv->cpu_reg;
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unsigned long volt = 0, volt_old = 0, tol = 0;
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- unsigned int old_freq, new_freq;
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+ unsigned int old_freq, new_freq, l2_freq;
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+ unsigned long new_l2_freq = 0;
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long freq_Hz, freq_exact;
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unsigned long opp_freq = 0;
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int ret;
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@@ -146,6 +148,30 @@ static int set_target(struct cpufreq_pol
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goto out;
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}
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+ if (!IS_ERR(l2_clk) && policy->l2_rate[0] && policy->l2_rate[1] &&
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+ policy->l2_rate[2]) {
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+ static unsigned long krait_l2[CONFIG_NR_CPUS] = { };
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+ int cpu, ret = 0;
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+
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+ if (freq_exact >= policy->l2_rate[2])
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+ new_l2_freq = policy->l2_rate[2];
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+ else if (freq_exact >= policy->l2_rate[1])
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+ new_l2_freq = policy->l2_rate[1];
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+ else
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+ new_l2_freq = policy->l2_rate[0];
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+
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+ krait_l2[policy->cpu] = new_l2_freq;
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+ for_each_present_cpu(cpu)
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+ new_l2_freq = max(new_l2_freq, krait_l2[cpu]);
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+
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+ l2_freq = clk_get_rate(l2_clk);
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+
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+ if (l2_freq != new_l2_freq) {
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+ /* scale l2 with the core */
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+ ret = clk_set_rate(l2_clk, new_l2_freq);
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+ }
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+ }
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+
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/* scaling down? scale voltage after frequency */
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if (!IS_ERR(cpu_reg) && new_freq < old_freq) {
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ret = regulator_set_voltage_tol(cpu_reg, volt, tol);
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@@ -156,18 +182,21 @@ static int set_target(struct cpufreq_pol
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goto out;
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}
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}
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+
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priv->opp_freq = opp_freq;
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+
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out:
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mutex_unlock(&priv->lock);
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return ret;
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}
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static int allocate_resources(int cpu, struct device **cdev,
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- struct regulator **creg, struct clk **cclk)
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+ struct regulator **creg, struct clk **cclk,
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+ struct clk **l2)
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{
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struct device *cpu_dev;
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struct regulator *cpu_reg;
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- struct clk *cpu_clk;
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+ struct clk *cpu_clk, *l2_clk = NULL;
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int ret = 0;
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char *reg_cpu0 = "cpu0", *reg_cpu = "cpu", *reg;
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@@ -227,6 +256,10 @@ try_again:
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*cdev = cpu_dev;
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*creg = cpu_reg;
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*cclk = cpu_clk;
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+
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+ l2_clk = clk_get(cpu_dev, "l2");
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+ if (!IS_ERR(l2_clk))
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+ *l2 = l2_clk;
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}
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return ret;
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@@ -236,18 +269,20 @@ static int cpufreq_init(struct cpufreq_p
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{
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struct cpufreq_frequency_table *freq_table;
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struct device_node *np;
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+ struct device_node *l2_np;
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struct private_data *priv;
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struct device *cpu_dev;
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struct regulator *cpu_reg;
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- struct clk *cpu_clk;
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struct dev_pm_opp *suspend_opp;
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+ struct clk *cpu_clk, *l2_clk;
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unsigned long min_uV = ~0, max_uV = 0;
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unsigned int transition_latency;
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bool need_update = false;
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int ret;
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struct srcu_notifier_head *opp_srcu_head;
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- ret = allocate_resources(policy->cpu, &cpu_dev, &cpu_reg, &cpu_clk);
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+ ret = allocate_resources(policy->cpu, &cpu_dev, &cpu_reg, &cpu_clk,
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+ &l2_clk);
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if (ret) {
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pr_err("%s: Failed to allocate resources: %d\n", __func__, ret);
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return ret;
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@@ -398,6 +433,11 @@ static int cpufreq_init(struct cpufreq_p
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if (suspend_opp)
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policy->suspend_freq = dev_pm_opp_get_freq(suspend_opp) / 1000;
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rcu_read_unlock();
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+ policy->l2_clk = l2_clk;
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+
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+ l2_np = of_find_node_by_name(NULL, "qcom,l2");
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+ if (l2_np)
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+ of_property_read_u32_array(l2_np, "qcom,l2-rates", policy->l2_rate, 3);
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ret = cpufreq_table_validate_and_show(policy, freq_table);
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if (ret) {
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@@ -498,7 +538,7 @@ static int dt_cpufreq_probe(struct platf
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{
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struct device *cpu_dev;
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struct regulator *cpu_reg;
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- struct clk *cpu_clk;
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+ struct clk *cpu_clk, *l2_clk;
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int ret;
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/*
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@@ -508,7 +548,7 @@ static int dt_cpufreq_probe(struct platf
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*
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* FIXME: Is checking this only for CPU0 sufficient ?
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*/
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- ret = allocate_resources(0, &cpu_dev, &cpu_reg, &cpu_clk);
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+ ret = allocate_resources(0, &cpu_dev, &cpu_reg, &cpu_clk, &l2_clk);
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if (ret)
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return ret;
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--- a/include/linux/cpufreq.h
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+++ b/include/linux/cpufreq.h
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@@ -67,6 +67,8 @@ struct cpufreq_policy {
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unsigned int cpu; /* cpu managing this policy, must be online */
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struct clk *clk;
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+ struct clk *l2_clk; /* L2 clock */
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+ unsigned int l2_rate[3]; /* L2 bus clock rate thresholds */
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struct cpufreq_cpuinfo cpuinfo;/* see above */
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unsigned int min; /* in kHz */
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@ -0,0 +1,33 @@
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From dafae9c5b39e2871bfd8db0b4bad6e850e42ef49 Mon Sep 17 00:00:00 2001
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From: Georgi Djakov <georgi.djakov@linaro.org>
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Date: Wed, 13 Jan 2016 15:10:25 +0200
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Subject: cpufreq-dt: Add missing rcu_read_lock() for find_device_opp()
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The function dev_pm_opp_get_notifier() must be called with held
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rcu_read_lock. In order to keep the pointer valid, add rcu_read_lock().
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Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
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||||||
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---
|
||||||
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drivers/cpufreq/cpufreq-dt.c | 3 +++
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||||||
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1 file changed, 3 insertions(+)
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||||||
|
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||||||
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--- a/drivers/cpufreq/cpufreq-dt.c
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+++ b/drivers/cpufreq/cpufreq-dt.c
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@@ -359,14 +359,17 @@ static int cpufreq_init(struct cpufreq_p
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mutex_init(&priv->lock);
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+ rcu_read_lock();
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opp_srcu_head = dev_pm_opp_get_notifier(cpu_dev);
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if (IS_ERR(opp_srcu_head)) {
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ret = PTR_ERR(opp_srcu_head);
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+ rcu_read_unlock();
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goto out_free_priv;
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}
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priv->opp_nb.notifier_call = opp_notifier;
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ret = srcu_notifier_chain_register(opp_srcu_head, &priv->opp_nb);
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+ rcu_read_unlock();
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if (ret)
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goto out_free_priv;
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Reference in New Issue
Block a user