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Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android

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This commit is contained in:
Alex Shi
2016-04-08 13:59:31 +08:00
parent 7c328c732f f96884662e
commit 9fe9bdd75b
8 changed files with 1583 additions and 547 deletions
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150
Documentation/devicetree/bindings/opp/opp.txt
View File

@@ -45,21 +45,10 @@ Devices supporting OPPs must set their "operating-points-v2" property with
phandle to a OPP table in their DT node. The OPP core will use this phandle to
find the operating points for the device.
Devices may want to choose OPP tables at runtime and so can provide a list of
phandles here. But only *one* of them should be chosen at runtime. This must be
accompanied by a corresponding "operating-points-names" property, to uniquely
identify the OPP tables.
If required, this can be extended for SoC vendor specfic bindings. Such bindings
should be documented as Documentation/devicetree/bindings/power/<vendor>-opp.txt
and should have a compatible description like: "operating-points-v2-<vendor>".
Optional properties:
- operating-points-names: Names of OPP tables (required if multiple OPP
tables are present), to uniquely identify them. The same list must be present
for all the CPUs which are sharing clock/voltage rails and hence the OPP
tables.
* OPP Table Node
This describes the OPPs belonging to a device. This node can have following
@@ -100,6 +89,14 @@ Optional properties:
Entries for multiple regulators must be present in the same order as
regulators are specified in device's DT node.
- opp-microvolt-<name>: Named opp-microvolt property. This is exactly similar to
the above opp-microvolt property, but allows multiple voltage ranges to be
provided for the same OPP. At runtime, the platform can pick a <name> and
matching opp-microvolt-<name> property will be enabled for all OPPs. If the
platform doesn't pick a specific <name> or the <name> doesn't match with any
opp-microvolt-<name> properties, then opp-microvolt property shall be used, if
present.
- opp-microamp: The maximum current drawn by the device in microamperes
considering system specific parameters (such as transients, process, aging,
maximum operating temperature range etc.) as necessary. This may be used to
@@ -112,6 +109,9 @@ Optional properties:
for few regulators, then this should be marked as zero for them. If it isn't
required for any regulator, then this property need not be present.
- opp-microamp-<name>: Named opp-microamp property. Similar to
opp-microvolt-<name> property, but for microamp instead.
- clock-latency-ns: Specifies the maximum possible transition latency (in
nanoseconds) for switching to this OPP from any other OPP.
@@ -123,6 +123,26 @@ Optional properties:
- opp-suspend: Marks the OPP to be used during device suspend. Only one OPP in
the table should have this.
- opp-supported-hw: This enables us to select only a subset of OPPs from the
larger OPP table, based on what version of the hardware we are running on. We
still can't have multiple nodes with the same opp-hz value in OPP table.
It's an user defined array containing a hierarchy of hardware version numbers,
supported by the OPP. For example: a platform with hierarchy of three levels
of versions (A, B and C), this field should be like <X Y Z>, where X
corresponds to Version hierarchy A, Y corresponds to version hierarchy B and Z
corresponds to version hierarchy C.
Each level of hierarchy is represented by a 32 bit value, and so there can be
only 32 different supported version per hierarchy. i.e. 1 bit per version. A
value of 0xFFFFFFFF will enable the OPP for all versions for that hierarchy
level. And a value of 0x00000000 will disable the OPP completely, and so we
never want that to happen.
If 32 values aren't sufficient for a version hierarchy, than that version
hierarchy can be contained in multiple 32 bit values. i.e. <X Y Z1 Z2> in the
above example, Z1 & Z2 refer to the version hierarchy Z.
- status: Marks the node enabled/disabled.
Example 1: Single cluster Dual-core ARM cortex A9, switch DVFS states together.
@@ -157,20 +177,20 @@ Example 1: Single cluster Dual-core ARM cortex A9, switch DVFS states together.
compatible = "operating-points-v2";
opp-shared;
opp00 {
opp@1000000000 {
opp-hz = /bits/ 64 <1000000000>;
opp-microvolt = <970000 975000 985000>;
opp-microamp = <70000>;
clock-latency-ns = <300000>;
opp-suspend;
};
opp01 {
opp@1100000000 {
opp-hz = /bits/ 64 <1100000000>;
opp-microvolt = <980000 1000000 1010000>;
opp-microamp = <80000>;
clock-latency-ns = <310000>;
};
opp02 {
opp@1200000000 {
opp-hz = /bits/ 64 <1200000000>;
opp-microvolt = <1025000>;
clock-latency-ns = <290000>;
@@ -236,20 +256,20 @@ independently.
* independently.
*/
opp00 {
opp@1000000000 {
opp-hz = /bits/ 64 <1000000000>;
opp-microvolt = <970000 975000 985000>;
opp-microamp = <70000>;
clock-latency-ns = <300000>;
opp-suspend;
};
opp01 {
opp@1100000000 {
opp-hz = /bits/ 64 <1100000000>;
opp-microvolt = <980000 1000000 1010000>;
opp-microamp = <80000>;
clock-latency-ns = <310000>;
};
opp02 {
opp@1200000000 {
opp-hz = /bits/ 64 <1200000000>;
opp-microvolt = <1025000>;
opp-microamp = <90000;
@@ -312,20 +332,20 @@ DVFS state together.
compatible = "operating-points-v2";
opp-shared;
opp00 {
opp@1000000000 {
opp-hz = /bits/ 64 <1000000000>;
opp-microvolt = <970000 975000 985000>;
opp-microamp = <70000>;
clock-latency-ns = <300000>;
opp-suspend;
};
opp01 {
opp@1100000000 {
opp-hz = /bits/ 64 <1100000000>;
opp-microvolt = <980000 1000000 1010000>;
opp-microamp = <80000>;
clock-latency-ns = <310000>;
};
opp02 {
opp@1200000000 {
opp-hz = /bits/ 64 <1200000000>;
opp-microvolt = <1025000>;
opp-microamp = <90000>;
@@ -338,20 +358,20 @@ DVFS state together.
compatible = "operating-points-v2";
opp-shared;
opp10 {
opp@1300000000 {
opp-hz = /bits/ 64 <1300000000>;
opp-microvolt = <1045000 1050000 1055000>;
opp-microamp = <95000>;
clock-latency-ns = <400000>;
opp-suspend;
};
opp11 {
opp@1400000000 {
opp-hz = /bits/ 64 <1400000000>;
opp-microvolt = <1075000>;
opp-microamp = <100000>;
clock-latency-ns = <400000>;
};
opp12 {
opp@1500000000 {
opp-hz = /bits/ 64 <1500000000>;
opp-microvolt = <1010000 1100000 1110000>;
opp-microamp = <95000>;
@@ -378,7 +398,7 @@ Example 4: Handling multiple regulators
compatible = "operating-points-v2";
opp-shared;
opp00 {
opp@1000000000 {
opp-hz = /bits/ 64 <1000000000>;
opp-microvolt = <970000>, /* Supply 0 */
<960000>, /* Supply 1 */
@@ -391,7 +411,7 @@ Example 4: Handling multiple regulators
/* OR */
opp00 {
opp@1000000000 {
opp-hz = /bits/ 64 <1000000000>;
opp-microvolt = <970000 975000 985000>, /* Supply 0 */
<960000 965000 975000>, /* Supply 1 */
@@ -404,7 +424,7 @@ Example 4: Handling multiple regulators
/* OR */
opp00 {
opp@1000000000 {
opp-hz = /bits/ 64 <1000000000>;
opp-microvolt = <970000 975000 985000>, /* Supply 0 */
<960000 965000 975000>, /* Supply 1 */
@@ -417,7 +437,8 @@ Example 4: Handling multiple regulators
};
};
Example 5: Multiple OPP tables
Example 5: opp-supported-hw
(example: three level hierarchy of versions: cuts, substrate and process)
/ {
cpus {
@@ -426,40 +447,73 @@ Example 5: Multiple OPP tables
...
cpu-supply = <&cpu_supply>
operating-points-v2 = <&cpu0_opp_table_slow>, <&cpu0_opp_table_fast>;
operating-points-names = "slow", "fast";
operating-points-v2 = <&cpu0_opp_table_slow>;
};
};
cpu0_opp_table_slow: opp_table_slow {
opp_table {
compatible = "operating-points-v2";
status = "okay";
opp-shared;
opp00 {
opp@600000000 {
/*
* Supports all substrate and process versions for 0xF
* cuts, i.e. only first four cuts.
*/
opp-supported-hw = <0xF 0xFFFFFFFF 0xFFFFFFFF>
opp-hz = /bits/ 64 <600000000>;
opp-microvolt = <900000 915000 925000>;
...
};
opp01 {
opp@800000000 {
/*
* Supports:
* - cuts: only one, 6th cut (represented by 6th bit).
* - substrate: supports 16 different substrate versions
* - process: supports 9 different process versions
*/
opp-supported-hw = <0x20 0xff0000ff 0x0000f4f0>
opp-hz = /bits/ 64 <800000000>;
...
};
};
cpu0_opp_table_fast: opp_table_fast {
compatible = "operating-points-v2";
status = "okay";
opp-shared;
opp10 {
opp-hz = /bits/ 64 <1000000000>;
...
};
opp11 {
opp-hz = /bits/ 64 <1100000000>;
opp-microvolt = <900000 915000 925000>;
...
};
};
};
Example 6: opp-microvolt-<name>, opp-microamp-<name>:
(example: device with two possible microvolt ranges: slow and fast)
/ {
cpus {
cpu@0 {
compatible = "arm,cortex-a7";
...
operating-points-v2 = <&cpu0_opp_table>;
};
};
cpu0_opp_table: opp_table0 {
compatible = "operating-points-v2";
opp-shared;
opp@1000000000 {
opp-hz = /bits/ 64 <1000000000>;
opp-microvolt-slow = <900000 915000 925000>;
opp-microvolt-fast = <970000 975000 985000>;
opp-microamp-slow = <70000>;
opp-microamp-fast = <71000>;
};
opp@1200000000 {
opp-hz = /bits/ 64 <1200000000>;
opp-microvolt-slow = <900000 915000 925000>, /* Supply vcc0 */
<910000 925000 935000>; /* Supply vcc1 */
opp-microvolt-fast = <970000 975000 985000>, /* Supply vcc0 */
<960000 965000 975000>; /* Supply vcc1 */
opp-microamp = <70000>; /* Will be used for both slow/fast */
};
};
};

1
drivers/base/power/opp/Makefile
View File

@@ -1,2 +1,3 @@
ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
obj-y += core.o cpu.o
obj-$(CONFIG_DEBUG_FS) += debugfs.o

1245
drivers/base/power/opp/core.c
View File

File diff suppressed because it is too large Load Diff

25
drivers/base/power/opp/cpu.c
View File

@@ -31,7 +31,7 @@
* @table: Cpufreq table returned back to caller
*
* Generate a cpufreq table for a provided device- this assumes that the
* opp list is already initialized and ready for usage.
* opp table is already initialized and ready for usage.
*
* This function allocates required memory for the cpufreq table. It is
* expected that the caller does the required maintenance such as freeing
@@ -44,7 +44,7 @@
* WARNING: It is important for the callers to ensure refreshing their copy of
* the table if any of the mentioned functions have been invoked in the interim.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* Locking: The internal opp_table and opp structures are RCU protected.
* Since we just use the regular accessor functions to access the internal data
* structures, we use RCU read lock inside this function. As a result, users of
* this function DONOT need to use explicit locks for invoking.
@@ -122,15 +122,15 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);
/* Required only for V1 bindings, as v2 can manage it from DT itself */
int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
{
struct device_list_opp *list_dev;
struct device_opp *dev_opp;
struct opp_device *opp_dev;
struct opp_table *opp_table;
struct device *dev;
int cpu, ret = 0;
mutex_lock(&dev_opp_list_lock);
mutex_lock(&opp_table_lock);
dev_opp = _find_device_opp(cpu_dev);
if (IS_ERR(dev_opp)) {
opp_table = _find_opp_table(cpu_dev);
if (IS_ERR(opp_table)) {
ret = -EINVAL;
goto unlock;
}
@@ -146,15 +146,15 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
continue;
}
list_dev = _add_list_dev(dev, dev_opp);
if (!list_dev) {
dev_err(dev, "%s: failed to add list-dev for cpu%d device\n",
opp_dev = _add_opp_dev(dev, opp_table);
if (!opp_dev) {
dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n",
__func__, cpu);
continue;
}
}
unlock:
mutex_unlock(&dev_opp_list_lock);
mutex_unlock(&opp_table_lock);
return ret;
}
@@ -214,7 +214,6 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table);
/*
* Works only for OPP v2 bindings.
*
* cpumask should be already set to mask of cpu_dev->id.
* Returns -ENOENT if operating-points-v2 bindings aren't supported.
*/
int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
@@ -230,6 +229,8 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask
return -ENOENT;
}
cpumask_set_cpu(cpu_dev->id, cpumask);
/* OPPs are shared ? */
if (!of_property_read_bool(np, "opp-shared"))
goto put_cpu_node;

218
drivers/base/power/opp/debugfs.c Normal file
View File

@@ -0,0 +1,218 @@
/*
* Generic OPP debugfs interface
*
* Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/limits.h>
#include "opp.h"
static struct dentry *rootdir;
static void opp_set_dev_name(const struct device *dev, char *name)
{
if (dev->parent)
snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent),
dev_name(dev));
else
snprintf(name, NAME_MAX, "%s", dev_name(dev));
}
void opp_debug_remove_one(struct dev_pm_opp *opp)
{
debugfs_remove_recursive(opp->dentry);
}
int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
{
struct dentry *pdentry = opp_table->dentry;
struct dentry *d;
char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */
/* Rate is unique to each OPP, use it to give opp-name */
snprintf(name, sizeof(name), "opp:%lu", opp->rate);
/* Create per-opp directory */
d = debugfs_create_dir(name, pdentry);
if (!d)
return -ENOMEM;
if (!debugfs_create_bool("available", S_IRUGO, d, &opp->available))
return -ENOMEM;
if (!debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic))
return -ENOMEM;
if (!debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo))
return -ENOMEM;
if (!debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend))
return -ENOMEM;
if (!debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate))
return -ENOMEM;
if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d, &opp->u_volt))
return -ENOMEM;
if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d, &opp->u_volt_min))
return -ENOMEM;
if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d, &opp->u_volt_max))
return -ENOMEM;
if (!debugfs_create_ulong("u_amp", S_IRUGO, d, &opp->u_amp))
return -ENOMEM;
if (!debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
&opp->clock_latency_ns))
return -ENOMEM;
opp->dentry = d;
return 0;
}
static int opp_list_debug_create_dir(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
const struct device *dev = opp_dev->dev;
struct dentry *d;
opp_set_dev_name(dev, opp_table->dentry_name);
/* Create device specific directory */
d = debugfs_create_dir(opp_table->dentry_name, rootdir);
if (!d) {
dev_err(dev, "%s: Failed to create debugfs dir\n", __func__);
return -ENOMEM;
}
opp_dev->dentry = d;
opp_table->dentry = d;
return 0;
}
static int opp_list_debug_create_link(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
const struct device *dev = opp_dev->dev;
char name[NAME_MAX];
struct dentry *d;
opp_set_dev_name(opp_dev->dev, name);
/* Create device specific directory link */
d = debugfs_create_symlink(name, rootdir, opp_table->dentry_name);
if (!d) {
dev_err(dev, "%s: Failed to create link\n", __func__);
return -ENOMEM;
}
opp_dev->dentry = d;
return 0;
}
/**
* opp_debug_register - add a device opp node to the debugfs 'opp' directory
* @opp_dev: opp-dev pointer for device
* @opp_table: the device-opp being added
*
* Dynamically adds device specific directory in debugfs 'opp' directory. If the
* device-opp is shared with other devices, then links will be created for all
* devices except the first.
*
* Return: 0 on success, otherwise negative error.
*/
int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
{
if (!rootdir) {
pr_debug("%s: Uninitialized rootdir\n", __func__);
return -EINVAL;
}
if (opp_table->dentry)
return opp_list_debug_create_link(opp_dev, opp_table);
return opp_list_debug_create_dir(opp_dev, opp_table);
}
static void opp_migrate_dentry(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
struct opp_device *new_dev;
const struct device *dev;
struct dentry *dentry;
/* Look for next opp-dev */
list_for_each_entry(new_dev, &opp_table->dev_list, node)
if (new_dev != opp_dev)
break;
/* new_dev is guaranteed to be valid here */
dev = new_dev->dev;
debugfs_remove_recursive(new_dev->dentry);
opp_set_dev_name(dev, opp_table->dentry_name);
dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,
opp_table->dentry_name);
if (!dentry) {
dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
__func__, dev_name(opp_dev->dev), dev_name(dev));
return;
}
new_dev->dentry = dentry;
opp_table->dentry = dentry;
}
/**
* opp_debug_unregister - remove a device opp node from debugfs opp directory
* @opp_dev: opp-dev pointer for device
* @opp_table: the device-opp being removed
*
* Dynamically removes device specific directory from debugfs 'opp' directory.
*/
void opp_debug_unregister(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
if (opp_dev->dentry == opp_table->dentry) {
/* Move the real dentry object under another device */
if (!list_is_singular(&opp_table->dev_list)) {
opp_migrate_dentry(opp_dev, opp_table);
goto out;
}
opp_table->dentry = NULL;
}
debugfs_remove_recursive(opp_dev->dentry);
out:
opp_dev->dentry = NULL;
}
static int __init opp_debug_init(void)
{
/* Create /sys/kernel/debug/opp directory */
rootdir = debugfs_create_dir("opp", NULL);
if (!rootdir) {
pr_err("%s: Failed to create root directory\n", __func__);
return -ENOMEM;
}
return 0;
}
core_initcall(opp_debug_init);

107
drivers/base/power/opp/opp.h
View File

@@ -17,17 +17,21 @@
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/limits.h>
#include <linux/pm_opp.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
struct clk;
struct regulator;
/* Lock to allow exclusive modification to the device and opp lists */
extern struct mutex dev_opp_list_lock;
extern struct mutex opp_table_lock;
/*
* Internal data structure organization with the OPP layer library is as
* follows:
* dev_opp_list (root)
* opp_tables (root)
* |- device 1 (represents voltage domain 1)
* | |- opp 1 (availability, freq, voltage)
* | |- opp 2 ..
@@ -36,23 +40,24 @@ extern struct mutex dev_opp_list_lock;
* |- device 2 (represents the next voltage domain)
* ...
* `- device m (represents mth voltage domain)
* device 1, 2.. are represented by dev_opp structure while each opp
* device 1, 2.. are represented by opp_table structure while each opp
* is represented by the opp structure.
*/
/**
* struct dev_pm_opp - Generic OPP description structure
* @node: opp list node. The nodes are maintained throughout the lifetime
* @node: opp table node. The nodes are maintained throughout the lifetime
* of boot. It is expected only an optimal set of OPPs are
* added to the library by the SoC framework.
* RCU usage: opp list is traversed with RCU locks. node
* RCU usage: opp table is traversed with RCU locks. node
* modification is possible realtime, hence the modifications
* are protected by the dev_opp_list_lock for integrity.
* are protected by the opp_table_lock for integrity.
* IMPORTANT: the opp nodes should be maintained in increasing
* order.
* @dynamic: not-created from static DT entries.
* @available: true/false - marks if this OPP as available or not
* @dynamic: not-created from static DT entries.
* @turbo: true if turbo (boost) OPP
* @suspend: true if suspend OPP
* @rate: Frequency in hertz
* @u_volt: Target voltage in microvolts corresponding to this OPP
* @u_volt_min: Minimum voltage in microvolts corresponding to this OPP
@@ -60,9 +65,10 @@ extern struct mutex dev_opp_list_lock;
* @u_amp: Maximum current drawn by the device in microamperes
* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
* frequency from any other OPP's frequency.
* @dev_opp: points back to the device_opp struct this opp belongs to
* @opp_table: points back to the opp_table struct this opp belongs to
* @rcu_head: RCU callback head used for deferred freeing
* @np: OPP's device node.
* @dentry: debugfs dentry pointer (per opp)
*
* This structure stores the OPP information for a given device.
*/
@@ -72,6 +78,7 @@ struct dev_pm_opp {
bool available;
bool dynamic;
bool turbo;
bool suspend;
unsigned long rate;
unsigned long u_volt;
@@ -80,40 +87,60 @@ struct dev_pm_opp {
unsigned long u_amp;
unsigned long clock_latency_ns;
struct device_opp *dev_opp;
struct opp_table *opp_table;
struct rcu_head rcu_head;
struct device_node *np;
#ifdef CONFIG_DEBUG_FS
struct dentry *dentry;
#endif
};
/**
* struct device_list_opp - devices managed by 'struct device_opp'
* struct opp_device - devices managed by 'struct opp_table'
* @node: list node
* @dev: device to which the struct object belongs
* @rcu_head: RCU callback head used for deferred freeing
* @dentry: debugfs dentry pointer (per device)
*
* This is an internal data structure maintaining the list of devices that are
* managed by 'struct device_opp'.
* This is an internal data structure maintaining the devices that are managed
* by 'struct opp_table'.
*/
struct device_list_opp {
struct opp_device {
struct list_head node;
const struct device *dev;
struct rcu_head rcu_head;
#ifdef CONFIG_DEBUG_FS
struct dentry *dentry;
#endif
};
/**
* struct device_opp - Device opp structure
* @node: list node - contains the devices with OPPs that
* struct opp_table - Device opp structure
* @node: table node - contains the devices with OPPs that
* have been registered. Nodes once added are not modified in this
* list.
* RCU usage: nodes are not modified in the list of device_opp,
* however addition is possible and is secured by dev_opp_list_lock
* table.
* RCU usage: nodes are not modified in the table of opp_table,
* however addition is possible and is secured by opp_table_lock
* @srcu_head: notifier head to notify the OPP availability changes.
* @rcu_head: RCU callback head used for deferred freeing
* @dev_list: list of devices that share these OPPs
* @opp_list: list of opps
* @opp_list: table of opps
* @np: struct device_node pointer for opp's DT node.
* @clock_latency_ns_max: Max clock latency in nanoseconds.
* @shared_opp: OPP is shared between multiple devices.
* @suspend_opp: Pointer to OPP to be used during device suspend.
* @supported_hw: Array of version number to support.
* @supported_hw_count: Number of elements in supported_hw array.
* @prop_name: A name to postfix to many DT properties, while parsing them.
* @clk: Device's clock handle
* @regulator: Supply regulator
* @dentry: debugfs dentry pointer of the real device directory (not links).
* @dentry_name: Name of the real dentry.
*
* @voltage_tolerance_v1: In percentage, for v1 bindings only.
*
* This is an internal data structure maintaining the link to opps attached to
* a device. This structure is not meant to be shared to users as it is
@@ -123,7 +150,7 @@ struct device_list_opp {
* need to wait for the grace period of both of them before freeing any
* resources. And so we have used kfree_rcu() from within call_srcu() handlers.
*/
struct device_opp {
struct opp_table {
struct list_head node;
struct srcu_notifier_head srcu_head;
@@ -133,14 +160,48 @@ struct device_opp {
struct device_node *np;
unsigned long clock_latency_ns_max;
/* For backward compatibility with v1 bindings */
unsigned int voltage_tolerance_v1;
bool shared_opp;
struct dev_pm_opp *suspend_opp;
unsigned int *supported_hw;
unsigned int supported_hw_count;
const char *prop_name;
struct clk *clk;
struct regulator *regulator;
#ifdef CONFIG_DEBUG_FS
struct dentry *dentry;
char dentry_name[NAME_MAX];
#endif
};
/* Routines internal to opp core */
struct device_opp *_find_device_opp(struct device *dev);
struct device_list_opp *_add_list_dev(const struct device *dev,
struct device_opp *dev_opp);
struct opp_table *_find_opp_table(struct device *dev);
struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
struct device_node *_of_get_opp_desc_node(struct device *dev);
#ifdef CONFIG_DEBUG_FS
void opp_debug_remove_one(struct dev_pm_opp *opp);
int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table);
int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table);
void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table);
#else
static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {}
static inline int opp_debug_create_one(struct dev_pm_opp *opp,
struct opp_table *opp_table)
{ return 0; }
static inline int opp_debug_register(struct opp_device *opp_dev,
struct opp_table *opp_table)
{ return 0; }
static inline void opp_debug_unregister(struct opp_device *opp_dev,
struct opp_table *opp_table)
{ }
#endif /* DEBUG_FS */
#endif /* __DRIVER_OPP_H__ */

335
drivers/cpufreq/cpufreq-dt.c
View File

@@ -31,9 +31,8 @@
struct private_data {
struct device *cpu_dev;
struct regulator *cpu_reg;
struct thermal_cooling_device *cdev;
unsigned int voltage_tolerance; /* in percentage */
const char *reg_name;
};
static struct freq_attr *cpufreq_dt_attr[] = {
@@ -44,175 +43,128 @@ static struct freq_attr *cpufreq_dt_attr[] = {
static int set_target(struct cpufreq_policy *policy, unsigned int index)
{
struct dev_pm_opp *opp;
struct cpufreq_frequency_table *freq_table = policy->freq_table;
struct clk *cpu_clk = policy->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;
long freq_Hz, freq_exact;
int ret;
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;
if (!IS_ERR(cpu_reg)) {
unsigned long opp_freq;
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_Hz);
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(cpu_dev, "failed to find OPP for %ld\n",
freq_Hz);
return PTR_ERR(opp);
}
volt = dev_pm_opp_get_voltage(opp);
opp_freq = dev_pm_opp_get_freq(opp);
rcu_read_unlock();
tol = volt * priv->voltage_tolerance / 100;
volt_old = regulator_get_voltage(cpu_reg);
dev_dbg(cpu_dev, "Found OPP: %ld kHz, %ld uV\n",
opp_freq / 1000, volt);
}
dev_dbg(cpu_dev, "%u MHz, %ld mV --> %u MHz, %ld mV\n",
old_freq / 1000, (volt_old > 0) ? volt_old / 1000 : -1,
new_freq / 1000, volt ? volt / 1000 : -1);
/* scaling up? scale voltage before frequency */
if (!IS_ERR(cpu_reg) && new_freq > old_freq) {
ret = regulator_set_voltage_tol(cpu_reg, volt, tol);
if (ret) {
dev_err(cpu_dev, "failed to scale voltage up: %d\n",
ret);
return ret;
}
}
ret = clk_set_rate(cpu_clk, freq_exact);
if (ret) {
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;
}
/* scaling down? scale voltage after frequency */
if (!IS_ERR(cpu_reg) && new_freq < old_freq) {
ret = regulator_set_voltage_tol(cpu_reg, volt, tol);
if (ret) {
dev_err(cpu_dev, "failed to scale voltage down: %d\n",
ret);
clk_set_rate(cpu_clk, old_freq * 1000);
}
}
return ret;
return dev_pm_opp_set_rate(priv->cpu_dev,
policy->freq_table[index].frequency * 1000);
}
static int allocate_resources(int cpu, struct device **cdev,
struct regulator **creg, struct clk **cclk)
/*
* An earlier version of opp-v1 bindings used to name the regulator
* "cpu0-supply", we still need to handle that for backwards compatibility.
*/
static const char *find_supply_name(struct device *dev)
{
struct device_node *np;
struct property *pp;
int cpu = dev->id;
const char *name = NULL;
np = of_node_get(dev->of_node);
/* This must be valid for sure */
if (WARN_ON(!np))
return NULL;
/* Try "cpu0" for older DTs */
if (!cpu) {
pp = of_find_property(np, "cpu0-supply", NULL);
if (pp) {
name = "cpu0";
goto node_put;
}
}
pp = of_find_property(np, "cpu-supply", NULL);
if (pp) {
name = "cpu";
goto node_put;
}
dev_dbg(dev, "no regulator for cpu%d\n", cpu);
node_put:
of_node_put(np);
return name;
}
static int resources_available(void)
{
struct device *cpu_dev;
struct regulator *cpu_reg;
struct clk *cpu_clk;
int ret = 0;
char *reg_cpu0 = "cpu0", *reg_cpu = "cpu", *reg;
const char *name;
cpu_dev = get_cpu_device(cpu);
cpu_dev = get_cpu_device(0);
if (!cpu_dev) {
pr_err("failed to get cpu%d device\n", cpu);
pr_err("failed to get cpu0 device\n");
return -ENODEV;
}
/* Try "cpu0" for older DTs */
if (!cpu)
reg = reg_cpu0;
else
reg = reg_cpu;
try_again:
cpu_reg = regulator_get_optional(cpu_dev, reg);
if (IS_ERR(cpu_reg)) {
/*
* If cpu's regulator supply node is present, but regulator is
* not yet registered, we should try defering probe.
*/
if (PTR_ERR(cpu_reg) == -EPROBE_DEFER) {
dev_dbg(cpu_dev, "cpu%d regulator not ready, retry\n",
cpu);
return -EPROBE_DEFER;
}
/* Try with "cpu-supply" */
if (reg == reg_cpu0) {
reg = reg_cpu;
goto try_again;
}
dev_dbg(cpu_dev, "no regulator for cpu%d: %ld\n",
cpu, PTR_ERR(cpu_reg));
}
cpu_clk = clk_get(cpu_dev, NULL);
if (IS_ERR(cpu_clk)) {
/* put regulator */
if (!IS_ERR(cpu_reg))
regulator_put(cpu_reg);
ret = PTR_ERR(cpu_clk);
ret = PTR_ERR_OR_ZERO(cpu_clk);
if (ret) {
/*
* If cpu's clk node is present, but clock is not yet
* registered, we should try defering probe.
*/
if (ret == -EPROBE_DEFER)
dev_dbg(cpu_dev, "cpu%d clock not ready, retry\n", cpu);
dev_dbg(cpu_dev, "clock not ready, retry\n");
else
dev_err(cpu_dev, "failed to get cpu%d clock: %d\n", cpu,
ret);
} else {
*cdev = cpu_dev;
*creg = cpu_reg;
*cclk = cpu_clk;
dev_err(cpu_dev, "failed to get clock: %d\n", ret);
return ret;
}
return ret;
clk_put(cpu_clk);
name = find_supply_name(cpu_dev);
/* Platform doesn't require regulator */
if (!name)
return 0;
cpu_reg = regulator_get_optional(cpu_dev, name);
ret = PTR_ERR_OR_ZERO(cpu_reg);
if (ret) {
/*
* If cpu's regulator supply node is present, but regulator is
* not yet registered, we should try defering probe.
*/
if (ret == -EPROBE_DEFER)
dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
else
dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);
return ret;
}
regulator_put(cpu_reg);
return 0;
}
static int cpufreq_init(struct cpufreq_policy *policy)
{
struct cpufreq_frequency_table *freq_table;
struct device_node *np;
struct private_data *priv;
struct device *cpu_dev;
struct regulator *cpu_reg;
struct clk *cpu_clk;
struct dev_pm_opp *suspend_opp;
unsigned long min_uV = ~0, max_uV = 0;
unsigned int transition_latency;
bool need_update = false;
bool opp_v1 = false;
const char *name;
int ret;
ret = allocate_resources(policy->cpu, &cpu_dev, &cpu_reg, &cpu_clk);
if (ret) {
pr_err("%s: Failed to allocate resources: %d\n", __func__, ret);
return ret;
cpu_dev = get_cpu_device(policy->cpu);
if (!cpu_dev) {
pr_err("failed to get cpu%d device\n", policy->cpu);
return -ENODEV;
}
np = of_node_get(cpu_dev->of_node);
if (!np) {
dev_err(cpu_dev, "failed to find cpu%d node\n", policy->cpu);
ret = -ENOENT;
goto out_put_reg_clk;
cpu_clk = clk_get(cpu_dev, NULL);
if (IS_ERR(cpu_clk)) {
ret = PTR_ERR(cpu_clk);
dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
return ret;
}
/* Get OPP-sharing information from "operating-points-v2" bindings */
@@ -223,9 +175,23 @@ static int cpufreq_init(struct cpufreq_policy *policy)
* finding shared-OPPs for backward compatibility.
*/
if (ret == -ENOENT)
need_update = true;
opp_v1 = true;
else
goto out_node_put;
goto out_put_clk;
}
/*
* OPP layer will be taking care of regulators now, but it needs to know
* the name of the regulator first.
*/
name = find_supply_name(cpu_dev);
if (name) {
ret = dev_pm_opp_set_regulator(cpu_dev, name);
if (ret) {
dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
policy->cpu, ret);
goto out_put_clk;
}
}
/*
@@ -246,12 +212,12 @@ static int cpufreq_init(struct cpufreq_policy *policy)
*/
ret = dev_pm_opp_get_opp_count(cpu_dev);
if (ret <= 0) {
pr_debug("OPP table is not ready, deferring probe\n");
dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
ret = -EPROBE_DEFER;
goto out_free_opp;
}
if (need_update) {
if (opp_v1) {
struct cpufreq_dt_platform_data *pd = cpufreq_get_driver_data();
if (!pd || !pd->independent_clocks)
@@ -265,10 +231,6 @@ static int cpufreq_init(struct cpufreq_policy *policy)
if (ret)
dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
__func__, ret);
of_property_read_u32(np, "clock-latency", &transition_latency);
} else {
transition_latency = dev_pm_opp_get_max_clock_latency(cpu_dev);
}
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
@@ -277,62 +239,16 @@ static int cpufreq_init(struct cpufreq_policy *policy)
goto out_free_opp;
}
of_property_read_u32(np, "voltage-tolerance", &priv->voltage_tolerance);
if (!transition_latency)
transition_latency = CPUFREQ_ETERNAL;
if (!IS_ERR(cpu_reg)) {
unsigned long opp_freq = 0;
/*
* Disable any OPPs where the connected regulator isn't able to
* provide the specified voltage and record minimum and maximum
* voltage levels.
*/
while (1) {
struct dev_pm_opp *opp;
unsigned long opp_uV, tol_uV;
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(cpu_dev, &opp_freq);
if (IS_ERR(opp)) {
rcu_read_unlock();
break;
}
opp_uV = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
tol_uV = opp_uV * priv->voltage_tolerance / 100;
if (regulator_is_supported_voltage(cpu_reg,
opp_uV - tol_uV,
opp_uV + tol_uV)) {
if (opp_uV < min_uV)
min_uV = opp_uV;
if (opp_uV > max_uV)
max_uV = opp_uV;
} else {
dev_pm_opp_disable(cpu_dev, opp_freq);
}
opp_freq++;
}
ret = regulator_set_voltage_time(cpu_reg, min_uV, max_uV);
if (ret > 0)
transition_latency += ret * 1000;
}
priv->reg_name = name;
ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
if (ret) {
pr_err("failed to init cpufreq table: %d\n", ret);
dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
goto out_free_priv;
}
priv->cpu_dev = cpu_dev;
priv->cpu_reg = cpu_reg;
policy->driver_data = priv;
policy->clk = cpu_clk;
rcu_read_lock();
@@ -357,9 +273,11 @@ static int cpufreq_init(struct cpufreq_policy *policy)
cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
}
policy->cpuinfo.transition_latency = transition_latency;
transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
if (!transition_latency)
transition_latency = CPUFREQ_ETERNAL;
of_node_put(np);
policy->cpuinfo.transition_latency = transition_latency;
return 0;
@@ -369,12 +287,10 @@ out_free_priv:
kfree(priv);
out_free_opp:
dev_pm_opp_of_cpumask_remove_table(policy->cpus);
out_node_put:
of_node_put(np);
out_put_reg_clk:
if (name)
dev_pm_opp_put_regulator(cpu_dev);
out_put_clk:
clk_put(cpu_clk);
if (!IS_ERR(cpu_reg))
regulator_put(cpu_reg);
return ret;
}
@@ -386,9 +302,10 @@ static int cpufreq_exit(struct cpufreq_policy *policy)
cpufreq_cooling_unregister(priv->cdev);
dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
if (priv->reg_name)
dev_pm_opp_put_regulator(priv->cpu_dev);
clk_put(policy->clk);
if (!IS_ERR(priv->cpu_reg))
regulator_put(priv->cpu_reg);
kfree(priv);
return 0;
@@ -407,8 +324,13 @@ static void cpufreq_ready(struct cpufreq_policy *policy)
* thermal DT code takes care of matching them.
*/
if (of_find_property(np, "#cooling-cells", NULL)) {
priv->cdev = of_cpufreq_cooling_register(np,
policy->related_cpus);
u32 power_coefficient = 0;
of_property_read_u32(np, "dynamic-power-coefficient",
&power_coefficient);
priv->cdev = of_cpufreq_power_cooling_register(np,
policy->related_cpus, power_coefficient, NULL);
if (IS_ERR(priv->cdev)) {
dev_err(priv->cpu_dev,
"running cpufreq without cooling device: %ld\n",
@@ -436,9 +358,6 @@ static struct cpufreq_driver dt_cpufreq_driver = {
static int dt_cpufreq_probe(struct platform_device *pdev)
{
struct device *cpu_dev;
struct regulator *cpu_reg;
struct clk *cpu_clk;
int ret;
/*
@@ -448,19 +367,15 @@ static int dt_cpufreq_probe(struct platform_device *pdev)
*
* FIXME: Is checking this only for CPU0 sufficient ?
*/
ret = allocate_resources(0, &cpu_dev, &cpu_reg, &cpu_clk);
ret = resources_available();
if (ret)
return ret;
clk_put(cpu_clk);
if (!IS_ERR(cpu_reg))
regulator_put(cpu_reg);
dt_cpufreq_driver.driver_data = dev_get_platdata(&pdev->dev);
ret = cpufreq_register_driver(&dt_cpufreq_driver);
if (ret)
dev_err(cpu_dev, "failed register driver: %d\n", ret);
dev_err(&pdev->dev, "failed register driver: %d\n", ret);
return ret;
}

49
include/linux/pm_opp.h
View File

@@ -34,6 +34,8 @@ bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
int dev_pm_opp_get_opp_count(struct device *dev);
unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);
unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev);
unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev);
struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev);
struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
@@ -55,6 +57,14 @@ int dev_pm_opp_enable(struct device *dev, unsigned long freq);
int dev_pm_opp_disable(struct device *dev, unsigned long freq);
struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev);
int dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions,
unsigned int count);
void dev_pm_opp_put_supported_hw(struct device *dev);
int dev_pm_opp_set_prop_name(struct device *dev, const char *name);
void dev_pm_opp_put_prop_name(struct device *dev);
int dev_pm_opp_set_regulator(struct device *dev, const char *name);
void dev_pm_opp_put_regulator(struct device *dev);
int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq);
#else
static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
{
@@ -81,6 +91,16 @@ static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
return 0;
}
static inline unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
{
return 0;
}
static inline unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
{
return 0;
}
static inline struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev)
{
return NULL;
@@ -129,6 +149,35 @@ static inline struct srcu_notifier_head *dev_pm_opp_get_notifier(
{
return ERR_PTR(-EINVAL);
}
static inline int dev_pm_opp_set_supported_hw(struct device *dev,
const u32 *versions,
unsigned int count)
{
return -EINVAL;
}
static inline void dev_pm_opp_put_supported_hw(struct device *dev) {}
static inline int dev_pm_opp_set_prop_name(struct device *dev, const char *name)
{
return -EINVAL;
}
static inline void dev_pm_opp_put_prop_name(struct device *dev) {}
static inline int dev_pm_opp_set_regulator(struct device *dev, const char *name)
{
return -EINVAL;
}
static inline void dev_pm_opp_put_regulator(struct device *dev) {}
static inline int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
{
return -EINVAL;
}
#endif /* CONFIG_PM_OPP */
#if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)