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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-06-10 18:10:30 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-06-10 18:10:30 +0300
commit4c277e2f859694291245701f054962e05c1ca16d (patch)
treea138d1a6460d2887ed3edc83bed55be9c7cdf8b0
parentafd8d7c7f93681370f6fc2ec62f2705710eee62d (diff)
parent4573e9ef51539905e713ce2b3148fe96b90b772d (diff)
downloadlinux-4c277e2f859694291245701f054962e05c1ca16d.tar.xz
Merge branch 'pm-opp'
* pm-opp: opp: Don't parse icc paths unnecessarily opp: Remove bandwidth votes when target_freq is zero opp: core: add regulators enable and disable opp: Reorder the code for !target_freq case opp: Expose bandwidth information via debugfs cpufreq: dt: Add support for interconnect bandwidth scaling opp: Update the bandwidth on OPP frequency changes opp: Add sanity checks in _read_opp_key() opp: Add support for parsing interconnect bandwidth interconnect: Remove unused module exit code from core interconnect: Disallow interconnect core to be built as a module interconnect: Add of_icc_get_by_index() helper function OPP: Add helpers for reading the binding properties dt-bindings: opp: Introduce opp-peak-kBps and opp-avg-kBps bindings
-rw-r--r--Documentation/devicetree/bindings/opp/opp.txt17
-rw-r--r--Documentation/devicetree/bindings/property-units.txt4
-rw-r--r--drivers/cpufreq/cpufreq-dt.c4
-rw-r--r--drivers/interconnect/Kconfig2
-rw-r--r--drivers/interconnect/core.c97
-rw-r--r--drivers/opp/core.c119
-rw-r--r--drivers/opp/debugfs.c42
-rw-r--r--drivers/opp/of.c205
-rw-r--r--drivers/opp/opp.h10
-rw-r--r--include/linux/interconnect.h12
-rw-r--r--include/linux/pm_opp.h18
11 files changed, 473 insertions, 57 deletions
diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt
index 68592271461f..9d16d417e9be 100644
--- a/Documentation/devicetree/bindings/opp/opp.txt
+++ b/Documentation/devicetree/bindings/opp/opp.txt
@@ -83,9 +83,14 @@ properties.
Required properties:
- opp-hz: Frequency in Hz, expressed as a 64-bit big-endian integer. This is a
- required property for all device nodes but devices like power domains. The
- power domain nodes must have another (implementation dependent) property which
- uniquely identifies the OPP nodes.
+ required property for all device nodes, unless another "required" property to
+ uniquely identify the OPP nodes exists. Devices like power domains must have
+ another (implementation dependent) property.
+
+- opp-peak-kBps: Peak bandwidth in kilobytes per second, expressed as an array
+ of 32-bit big-endian integers. Each element of the array represents the
+ peak bandwidth value of each interconnect path. The number of elements should
+ match the number of interconnect paths.
Optional properties:
- opp-microvolt: voltage in micro Volts.
@@ -132,6 +137,12 @@ Optional properties:
- opp-level: A value representing the performance level of the device,
expressed as a 32-bit integer.
+- opp-avg-kBps: Average bandwidth in kilobytes per second, expressed as an array
+ of 32-bit big-endian integers. Each element of the array represents the
+ average bandwidth value of each interconnect path. The number of elements
+ should match the number of interconnect paths. This property is only
+ meaningful in OPP tables where opp-peak-kBps is present.
+
- clock-latency-ns: Specifies the maximum possible transition latency (in
nanoseconds) for switching to this OPP from any other OPP.
diff --git a/Documentation/devicetree/bindings/property-units.txt b/Documentation/devicetree/bindings/property-units.txt
index e9b8360b3288..c80a110c1e26 100644
--- a/Documentation/devicetree/bindings/property-units.txt
+++ b/Documentation/devicetree/bindings/property-units.txt
@@ -41,3 +41,7 @@ Temperature
Pressure
----------------------------------------
-kpascal : kilopascal
+
+Throughput
+----------------------------------------
+-kBps : kilobytes per second
diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 26fe8dfb9ce6..79742bbd221f 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -121,6 +121,10 @@ static int resources_available(void)
clk_put(cpu_clk);
+ ret = dev_pm_opp_of_find_icc_paths(cpu_dev, NULL);
+ if (ret)
+ return ret;
+
name = find_supply_name(cpu_dev);
/* Platform doesn't require regulator */
if (!name)
diff --git a/drivers/interconnect/Kconfig b/drivers/interconnect/Kconfig
index bfa4ca3ab7a9..b6ea8f0a6122 100644
--- a/drivers/interconnect/Kconfig
+++ b/drivers/interconnect/Kconfig
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
menuconfig INTERCONNECT
- tristate "On-Chip Interconnect management support"
+ bool "On-Chip Interconnect management support"
help
Support for management of the on-chip interconnects.
diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index 2c6515e3ecf1..a56349c14985 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -351,9 +351,9 @@ static struct icc_node *of_icc_get_from_provider(struct of_phandle_args *spec)
}
/**
- * of_icc_get() - get a path handle from a DT node based on name
+ * of_icc_get_by_index() - get a path handle from a DT node based on index
* @dev: device pointer for the consumer device
- * @name: interconnect path name
+ * @idx: interconnect path index
*
* This function will search for a path between two endpoints and return an
* icc_path handle on success. Use icc_put() to release constraints when they
@@ -365,13 +365,12 @@ static struct icc_node *of_icc_get_from_provider(struct of_phandle_args *spec)
* Return: icc_path pointer on success or ERR_PTR() on error. NULL is returned
* when the API is disabled or the "interconnects" DT property is missing.
*/
-struct icc_path *of_icc_get(struct device *dev, const char *name)
+struct icc_path *of_icc_get_by_index(struct device *dev, int idx)
{
- struct icc_path *path = ERR_PTR(-EPROBE_DEFER);
+ struct icc_path *path;
struct icc_node *src_node, *dst_node;
- struct device_node *np = NULL;
+ struct device_node *np;
struct of_phandle_args src_args, dst_args;
- int idx = 0;
int ret;
if (!dev || !dev->of_node)
@@ -391,12 +390,6 @@ struct icc_path *of_icc_get(struct device *dev, const char *name)
* lets support only global ids and extend this in the future if needed
* without breaking DT compatibility.
*/
- if (name) {
- idx = of_property_match_string(np, "interconnect-names", name);
- if (idx < 0)
- return ERR_PTR(idx);
- }
-
ret = of_parse_phandle_with_args(np, "interconnects",
"#interconnect-cells", idx * 2,
&src_args);
@@ -439,12 +432,8 @@ struct icc_path *of_icc_get(struct device *dev, const char *name)
return path;
}
- if (name)
- path->name = kstrdup_const(name, GFP_KERNEL);
- else
- path->name = kasprintf(GFP_KERNEL, "%s-%s",
- src_node->name, dst_node->name);
-
+ path->name = kasprintf(GFP_KERNEL, "%s-%s",
+ src_node->name, dst_node->name);
if (!path->name) {
kfree(path);
return ERR_PTR(-ENOMEM);
@@ -452,6 +441,53 @@ struct icc_path *of_icc_get(struct device *dev, const char *name)
return path;
}
+EXPORT_SYMBOL_GPL(of_icc_get_by_index);
+
+/**
+ * of_icc_get() - get a path handle from a DT node based on name
+ * @dev: device pointer for the consumer device
+ * @name: interconnect path name
+ *
+ * This function will search for a path between two endpoints and return an
+ * icc_path handle on success. Use icc_put() to release constraints when they
+ * are not needed anymore.
+ * If the interconnect API is disabled, NULL is returned and the consumer
+ * drivers will still build. Drivers are free to handle this specifically,
+ * but they don't have to.
+ *
+ * Return: icc_path pointer on success or ERR_PTR() on error. NULL is returned
+ * when the API is disabled or the "interconnects" DT property is missing.
+ */
+struct icc_path *of_icc_get(struct device *dev, const char *name)
+{
+ struct device_node *np;
+ int idx = 0;
+
+ if (!dev || !dev->of_node)
+ return ERR_PTR(-ENODEV);
+
+ np = dev->of_node;
+
+ /*
+ * When the consumer DT node do not have "interconnects" property
+ * return a NULL path to skip setting constraints.
+ */
+ if (!of_find_property(np, "interconnects", NULL))
+ return NULL;
+
+ /*
+ * We use a combination of phandle and specifier for endpoint. For now
+ * lets support only global ids and extend this in the future if needed
+ * without breaking DT compatibility.
+ */
+ if (name) {
+ idx = of_property_match_string(np, "interconnect-names", name);
+ if (idx < 0)
+ return ERR_PTR(idx);
+ }
+
+ return of_icc_get_by_index(dev, idx);
+}
EXPORT_SYMBOL_GPL(of_icc_get);
/**
@@ -479,6 +515,24 @@ void icc_set_tag(struct icc_path *path, u32 tag)
EXPORT_SYMBOL_GPL(icc_set_tag);
/**
+ * icc_get_name() - Get name of the icc path
+ * @path: reference to the path returned by icc_get()
+ *
+ * This function is used by an interconnect consumer to get the name of the icc
+ * path.
+ *
+ * Returns a valid pointer on success, or NULL otherwise.
+ */
+const char *icc_get_name(struct icc_path *path)
+{
+ if (!path)
+ return NULL;
+
+ return path->name;
+}
+EXPORT_SYMBOL_GPL(icc_get_name);
+
+/**
* icc_set_bw() - set bandwidth constraints on an interconnect path
* @path: reference to the path returned by icc_get()
* @avg_bw: average bandwidth in kilobytes per second
@@ -908,12 +962,7 @@ static int __init icc_init(void)
return 0;
}
-static void __exit icc_exit(void)
-{
- debugfs_remove_recursive(icc_debugfs_dir);
-}
-module_init(icc_init);
-module_exit(icc_exit);
+device_initcall(icc_init);
MODULE_AUTHOR("Georgi Djakov <georgi.djakov@linaro.org>");
MODULE_DESCRIPTION("Interconnect Driver Core");
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index e4f01e7771a2..dfbd3d10410c 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -664,7 +664,7 @@ static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk,
return ret;
}
-static int _generic_set_opp_regulator(const struct opp_table *opp_table,
+static int _generic_set_opp_regulator(struct opp_table *opp_table,
struct device *dev,
unsigned long old_freq,
unsigned long freq,
@@ -699,6 +699,18 @@ static int _generic_set_opp_regulator(const struct opp_table *opp_table,
goto restore_freq;
}
+ /*
+ * Enable the regulator after setting its voltages, otherwise it breaks
+ * some boot-enabled regulators.
+ */
+ if (unlikely(!opp_table->regulator_enabled)) {
+ ret = regulator_enable(reg);
+ if (ret < 0)
+ dev_warn(dev, "Failed to enable regulator: %d", ret);
+ else
+ opp_table->regulator_enabled = true;
+ }
+
return 0;
restore_freq:
@@ -713,6 +725,34 @@ restore_voltage:
return ret;
}
+static int _set_opp_bw(const struct opp_table *opp_table,
+ struct dev_pm_opp *opp, struct device *dev, bool remove)
+{
+ u32 avg, peak;
+ int i, ret;
+
+ if (!opp_table->paths)
+ return 0;
+
+ for (i = 0; i < opp_table->path_count; i++) {
+ if (remove) {
+ avg = 0;
+ peak = 0;
+ } else {
+ avg = opp->bandwidth[i].avg;
+ peak = opp->bandwidth[i].peak;
+ }
+ ret = icc_set_bw(opp_table->paths[i], avg, peak);
+ if (ret) {
+ dev_err(dev, "Failed to %s bandwidth[%d]: %d\n",
+ remove ? "remove" : "set", i, ret);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
static int _set_opp_custom(const struct opp_table *opp_table,
struct device *dev, unsigned long old_freq,
unsigned long freq,
@@ -817,15 +857,31 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
}
if (unlikely(!target_freq)) {
- if (opp_table->required_opp_tables) {
- ret = _set_required_opps(dev, opp_table, NULL);
- } else if (!_get_opp_count(opp_table)) {
+ /*
+ * Some drivers need to support cases where some platforms may
+ * have OPP table for the device, while others don't and
+ * opp_set_rate() just needs to behave like clk_set_rate().
+ */
+ if (!_get_opp_count(opp_table))
return 0;
- } else {
+
+ if (!opp_table->required_opp_tables && !opp_table->regulators &&
+ !opp_table->paths) {
dev_err(dev, "target frequency can't be 0\n");
ret = -EINVAL;
+ goto put_opp_table;
+ }
+
+ ret = _set_opp_bw(opp_table, NULL, dev, true);
+ if (ret)
+ return ret;
+
+ if (opp_table->regulator_enabled) {
+ regulator_disable(opp_table->regulators[0]);
+ opp_table->regulator_enabled = false;
}
+ ret = _set_required_opps(dev, opp_table, NULL);
goto put_opp_table;
}
@@ -909,6 +965,9 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
dev_err(dev, "Failed to set required opps: %d\n", ret);
}
+ if (!ret)
+ ret = _set_opp_bw(opp_table, opp, dev, false);
+
put_opp:
dev_pm_opp_put(opp);
put_old_opp:
@@ -999,6 +1058,12 @@ static struct opp_table *_allocate_opp_table(struct device *dev, int index)
ret);
}
+ /* Find interconnect path(s) for the device */
+ ret = dev_pm_opp_of_find_icc_paths(dev, opp_table);
+ if (ret)
+ dev_warn(dev, "%s: Error finding interconnect paths: %d\n",
+ __func__, ret);
+
BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head);
INIT_LIST_HEAD(&opp_table->opp_list);
kref_init(&opp_table->kref);
@@ -1057,6 +1122,7 @@ static void _opp_table_kref_release(struct kref *kref)
{
struct opp_table *opp_table = container_of(kref, struct opp_table, kref);
struct opp_device *opp_dev, *temp;
+ int i;
_of_clear_opp_table(opp_table);
@@ -1064,6 +1130,12 @@ static void _opp_table_kref_release(struct kref *kref)
if (!IS_ERR(opp_table->clk))
clk_put(opp_table->clk);
+ if (opp_table->paths) {
+ for (i = 0; i < opp_table->path_count; i++)
+ icc_put(opp_table->paths[i]);
+ kfree(opp_table->paths);
+ }
+
WARN_ON(!list_empty(&opp_table->opp_list));
list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) {
@@ -1243,19 +1315,23 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic);
struct dev_pm_opp *_opp_allocate(struct opp_table *table)
{
struct dev_pm_opp *opp;
- int count, supply_size;
+ int supply_count, supply_size, icc_size;
/* Allocate space for at least one supply */
- count = table->regulator_count > 0 ? table->regulator_count : 1;
- supply_size = sizeof(*opp->supplies) * count;
+ supply_count = table->regulator_count > 0 ? table->regulator_count : 1;
+ supply_size = sizeof(*opp->supplies) * supply_count;
+ icc_size = sizeof(*opp->bandwidth) * table->path_count;
/* allocate new OPP node and supplies structures */
- opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL);
+ opp = kzalloc(sizeof(*opp) + supply_size + icc_size, GFP_KERNEL);
+
if (!opp)
return NULL;
/* Put the supplies at the end of the OPP structure as an empty array */
opp->supplies = (struct dev_pm_opp_supply *)(opp + 1);
+ if (icc_size)
+ opp->bandwidth = (struct dev_pm_opp_icc_bw *)(opp->supplies + supply_count);
INIT_LIST_HEAD(&opp->node);
return opp;
@@ -1286,11 +1362,24 @@ static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
return true;
}
+int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2)
+{
+ if (opp1->rate != opp2->rate)
+ return opp1->rate < opp2->rate ? -1 : 1;
+ if (opp1->bandwidth && opp2->bandwidth &&
+ opp1->bandwidth[0].peak != opp2->bandwidth[0].peak)
+ return opp1->bandwidth[0].peak < opp2->bandwidth[0].peak ? -1 : 1;
+ if (opp1->level != opp2->level)
+ return opp1->level < opp2->level ? -1 : 1;
+ return 0;
+}
+
static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp,
struct opp_table *opp_table,
struct list_head **head)
{
struct dev_pm_opp *opp;
+ int opp_cmp;
/*
* Insert new OPP in order of increasing frequency and discard if
@@ -1301,12 +1390,13 @@ static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp,
* loop.
*/
list_for_each_entry(opp, &opp_table->opp_list, node) {
- if (new_opp->rate > opp->rate) {
+ opp_cmp = _opp_compare_key(new_opp, opp);
+ if (opp_cmp > 0) {
*head = &opp->node;
continue;
}
- if (new_opp->rate < opp->rate)
+ if (opp_cmp < 0)
return 0;
/* Duplicate OPPs */
@@ -1670,6 +1760,13 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table)
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
+ if (opp_table->regulator_enabled) {
+ for (i = opp_table->regulator_count - 1; i >= 0; i--)
+ regulator_disable(opp_table->regulators[i]);
+
+ opp_table->regulator_enabled = false;
+ }
+
for (i = opp_table->regulator_count - 1; i >= 0; i--)
regulator_put(opp_table->regulators[i]);
diff --git a/drivers/opp/debugfs.c b/drivers/opp/debugfs.c
index 609665e339b6..596c185b5dda 100644
--- a/drivers/opp/debugfs.c
+++ b/drivers/opp/debugfs.c
@@ -32,6 +32,47 @@ void opp_debug_remove_one(struct dev_pm_opp *opp)
debugfs_remove_recursive(opp->dentry);
}
+static ssize_t bw_name_read(struct file *fp, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct icc_path *path = fp->private_data;
+ char buf[64];
+ int i;
+
+ i = scnprintf(buf, sizeof(buf), "%.62s\n", icc_get_name(path));
+
+ return simple_read_from_buffer(userbuf, count, ppos, buf, i);
+}
+
+static const struct file_operations bw_name_fops = {
+ .open = simple_open,
+ .read = bw_name_read,
+ .llseek = default_llseek,
+};
+
+static void opp_debug_create_bw(struct dev_pm_opp *opp,
+ struct opp_table *opp_table,
+ struct dentry *pdentry)
+{
+ struct dentry *d;
+ char name[11];
+ int i;
+
+ for (i = 0; i < opp_table->path_count; i++) {
+ snprintf(name, sizeof(name), "icc-path-%.1d", i);
+
+ /* Create per-path directory */
+ d = debugfs_create_dir(name, pdentry);
+
+ debugfs_create_file("name", S_IRUGO, d, opp_table->paths[i],
+ &bw_name_fops);
+ debugfs_create_u32("peak_bw", S_IRUGO, d,
+ &opp->bandwidth[i].peak);
+ debugfs_create_u32("avg_bw", S_IRUGO, d,
+ &opp->bandwidth[i].avg);
+ }
+}
+
static void opp_debug_create_supplies(struct dev_pm_opp *opp,
struct opp_table *opp_table,
struct dentry *pdentry)
@@ -94,6 +135,7 @@ void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
&opp->clock_latency_ns);
opp_debug_create_supplies(opp, opp_table, d);
+ opp_debug_create_bw(opp, opp_table, d);
opp->dentry = d;
}
diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index 9cd8f0adacae..9a5873591a40 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -332,6 +332,105 @@ free_required_opps:
return ret;
}
+static int _bandwidth_supported(struct device *dev, struct opp_table *opp_table)
+{
+ struct device_node *np, *opp_np;
+ struct property *prop;
+
+ if (!opp_table) {
+ np = of_node_get(dev->of_node);
+ if (!np)
+ return -ENODEV;
+
+ opp_np = _opp_of_get_opp_desc_node(np, 0);
+ of_node_put(np);
+ } else {
+ opp_np = of_node_get(opp_table->np);
+ }
+
+ /* Lets not fail in case we are parsing opp-v1 bindings */
+ if (!opp_np)
+ return 0;
+
+ /* Checking only first OPP is sufficient */
+ np = of_get_next_available_child(opp_np, NULL);
+ if (!np) {
+ dev_err(dev, "OPP table empty\n");
+ return -EINVAL;
+ }
+ of_node_put(opp_np);
+
+ prop = of_find_property(np, "opp-peak-kBps", NULL);
+ of_node_put(np);
+
+ if (!prop || !prop->length)
+ return 0;
+
+ return 1;
+}
+
+int dev_pm_opp_of_find_icc_paths(struct device *dev,
+ struct opp_table *opp_table)
+{
+ struct device_node *np;
+ int ret, i, count, num_paths;
+ struct icc_path **paths;
+
+ ret = _bandwidth_supported(dev, opp_table);
+ if (ret <= 0)
+ return ret;
+
+ ret = 0;
+
+ np = of_node_get(dev->of_node);
+ if (!np)
+ return 0;
+
+ count = of_count_phandle_with_args(np, "interconnects",
+ "#interconnect-cells");
+ of_node_put(np);
+ if (count < 0)
+ return 0;
+
+ /* two phandles when #interconnect-cells = <1> */
+ if (count % 2) {
+ dev_err(dev, "%s: Invalid interconnects values\n", __func__);
+ return -EINVAL;
+ }
+
+ num_paths = count / 2;
+ paths = kcalloc(num_paths, sizeof(*paths), GFP_KERNEL);
+ if (!paths)
+ return -ENOMEM;
+
+ for (i = 0; i < num_paths; i++) {
+ paths[i] = of_icc_get_by_index(dev, i);
+ if (IS_ERR(paths[i])) {
+ ret = PTR_ERR(paths[i]);
+ if (ret != -EPROBE_DEFER) {
+ dev_err(dev, "%s: Unable to get path%d: %d\n",
+ __func__, i, ret);
+ }
+ goto err;
+ }
+ }
+
+ if (opp_table) {
+ opp_table->paths = paths;
+ opp_table->path_count = num_paths;
+ return 0;
+ }
+
+err:
+ while (i--)
+ icc_put(paths[i]);
+
+ kfree(paths);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_of_find_icc_paths);
+
static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
struct device_node *np)
{
@@ -521,6 +620,90 @@ void dev_pm_opp_of_remove_table(struct device *dev)
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
+static int _read_bw(struct dev_pm_opp *new_opp, struct opp_table *table,
+ struct device_node *np, bool peak)
+{
+ const char *name = peak ? "opp-peak-kBps" : "opp-avg-kBps";
+ struct property *prop;
+ int i, count, ret;
+ u32 *bw;
+
+ prop = of_find_property(np, name, NULL);
+ if (!prop)
+ return -ENODEV;
+
+ count = prop->length / sizeof(u32);
+ if (table->path_count != count) {
+ pr_err("%s: Mismatch between %s and paths (%d %d)\n",
+ __func__, name, count, table->path_count);
+ return -EINVAL;
+ }
+
+ bw = kmalloc_array(count, sizeof(*bw), GFP_KERNEL);
+ if (!bw)
+ return -ENOMEM;
+
+ ret = of_property_read_u32_array(np, name, bw, count);
+ if (ret) {
+ pr_err("%s: Error parsing %s: %d\n", __func__, name, ret);
+ goto out;
+ }
+
+ for (i = 0; i < count; i++) {
+ if (peak)
+ new_opp->bandwidth[i].peak = kBps_to_icc(bw[i]);
+ else
+ new_opp->bandwidth[i].avg = kBps_to_icc(bw[i]);
+ }
+
+out:
+ kfree(bw);
+ return ret;
+}
+
+static int _read_opp_key(struct dev_pm_opp *new_opp, struct opp_table *table,
+ struct device_node *np, bool *rate_not_available)
+{
+ bool found = false;
+ u64 rate;
+ int ret;
+
+ ret = of_property_read_u64(np, "opp-hz", &rate);
+ if (!ret) {
+ /*
+ * Rate is defined as an unsigned long in clk API, and so
+ * casting explicitly to its type. Must be fixed once rate is 64
+ * bit guaranteed in clk API.
+ */
+ new_opp->rate = (unsigned long)rate;
+ found = true;
+ }
+ *rate_not_available = !!ret;
+
+ /*
+ * Bandwidth consists of peak and average (optional) values:
+ * opp-peak-kBps = <path1_value path2_value>;
+ * opp-avg-kBps = <path1_value path2_value>;
+ */
+ ret = _read_bw(new_opp, table, np, true);
+ if (!ret) {
+ found = true;
+ ret = _read_bw(new_opp, table, np, false);
+ }
+
+ /* The properties were found but we failed to parse them */
+ if (ret && ret != -ENODEV)
+ return ret;
+
+ if (!of_property_read_u32(np, "opp-level", &new_opp->level))
+ found = true;
+
+ if (found)
+ return 0;
+
+ return ret;
+}
+
/**
* _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
* @opp_table: OPP table
@@ -558,26 +741,12 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
if (!new_opp)
return ERR_PTR(-ENOMEM);
- ret = of_property_read_u64(np, "opp-hz", &rate);
- if (ret < 0) {
- /* "opp-hz" is optional for devices like power domains. */
- if (!opp_table->is_genpd) {
- dev_err(dev, "%s: opp-hz not found\n", __func__);
- goto free_opp;
- }
-
- rate_not_available = true;
- } else {
- /*
- * Rate is defined as an unsigned long in clk API, and so
- * casting explicitly to its type. Must be fixed once rate is 64
- * bit guaranteed in clk API.
- */
- new_opp->rate = (unsigned long)rate;
+ ret = _read_opp_key(new_opp, opp_table, np, &rate_not_available);
+ if (ret < 0 && !opp_table->is_genpd) {
+ dev_err(dev, "%s: opp key field not found\n", __func__);
+ goto free_opp;
}
- of_property_read_u32(np, "opp-level", &new_opp->level);
-
/* Check if the OPP supports hardware's hierarchy of versions or not */
if (!_opp_is_supported(dev, opp_table, np)) {
dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate);
diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
index d14e27102730..e51646ff279e 100644
--- a/drivers/opp/opp.h
+++ b/drivers/opp/opp.h
@@ -12,6 +12,7 @@
#define __DRIVER_OPP_H__
#include <linux/device.h>
+#include <linux/interconnect.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/list.h>
@@ -59,6 +60,7 @@ extern struct list_head opp_tables;
* @rate: Frequency in hertz
* @level: Performance level
* @supplies: Power supplies voltage/current values
+ * @bandwidth: Interconnect bandwidth values
* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
* frequency from any other OPP's frequency.
* @required_opps: List of OPPs that are required by this OPP.
@@ -81,6 +83,7 @@ struct dev_pm_opp {
unsigned int level;
struct dev_pm_opp_supply *supplies;
+ struct dev_pm_opp_icc_bw *bandwidth;
unsigned long clock_latency_ns;
@@ -144,8 +147,11 @@ enum opp_table_access {
* @clk: Device's clock handle
* @regulators: Supply regulators
* @regulator_count: Number of power supply regulators. Its value can be -1
+ * @regulator_enabled: Set to true if regulators were previously enabled.
* (uninitialized), 0 (no opp-microvolt property) or > 0 (has opp-microvolt
* property).
+ * @paths: Interconnect path handles
+ * @path_count: Number of interconnect paths
* @genpd_performance_state: Device's power domain support performance state.
* @is_genpd: Marks if the OPP table belongs to a genpd.
* @set_opp: Platform specific set_opp callback
@@ -189,6 +195,9 @@ struct opp_table {
struct clk *clk;
struct regulator **regulators;
int regulator_count;
+ bool regulator_enabled;
+ struct icc_path **paths;
+ unsigned int path_count;
bool genpd_performance_state;
bool is_genpd;
@@ -211,6 +220,7 @@ struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_
void _dev_pm_opp_find_and_remove_table(struct device *dev);
struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table);
void _opp_free(struct dev_pm_opp *opp);
+int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2);
int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table, bool rate_not_available);
int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic);
void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, int last_cpu);
diff --git a/include/linux/interconnect.h b/include/linux/interconnect.h
index d70a914cba11..1ad09efd296e 100644
--- a/include/linux/interconnect.h
+++ b/include/linux/interconnect.h
@@ -28,9 +28,11 @@ struct device;
struct icc_path *icc_get(struct device *dev, const int src_id,
const int dst_id);
struct icc_path *of_icc_get(struct device *dev, const char *name);
+struct icc_path *of_icc_get_by_index(struct device *dev, int idx);
void icc_put(struct icc_path *path);
int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw);
void icc_set_tag(struct icc_path *path, u32 tag);
+const char *icc_get_name(struct icc_path *path);
#else
@@ -46,6 +48,11 @@ static inline struct icc_path *of_icc_get(struct device *dev,
return NULL;
}
+static inline struct icc_path *of_icc_get_by_index(struct device *dev, int idx)
+{
+ return NULL;
+}
+
static inline void icc_put(struct icc_path *path)
{
}
@@ -59,6 +66,11 @@ static inline void icc_set_tag(struct icc_path *path, u32 tag)
{
}
+static inline const char *icc_get_name(struct icc_path *path)
+{
+ return NULL;
+}
+
#endif /* CONFIG_INTERCONNECT */
#endif /* __LINUX_INTERCONNECT_H */
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 747861816f4f..d5c4a329321d 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -42,6 +42,18 @@ struct dev_pm_opp_supply {
};
/**
+ * struct dev_pm_opp_icc_bw - Interconnect bandwidth values
+ * @avg: Average bandwidth corresponding to this OPP (in icc units)
+ * @peak: Peak bandwidth corresponding to this OPP (in icc units)
+ *
+ * This structure stores the bandwidth values for a single interconnect path.
+ */
+struct dev_pm_opp_icc_bw {
+ u32 avg;
+ u32 peak;
+};
+
+/**
* struct dev_pm_opp_info - OPP freq/voltage/current values
* @rate: Target clk rate in hz
* @supplies: Array of voltage/current values for all power supplies
@@ -360,6 +372,7 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpuma
struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev);
struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp);
int of_get_required_opp_performance_state(struct device_node *np, int index);
+int dev_pm_opp_of_find_icc_paths(struct device *dev, struct opp_table *opp_table);
void dev_pm_opp_of_register_em(struct cpumask *cpus);
#else
static inline int dev_pm_opp_of_add_table(struct device *dev)
@@ -408,6 +421,11 @@ static inline int of_get_required_opp_performance_state(struct device_node *np,
{
return -ENOTSUPP;
}
+
+static inline int dev_pm_opp_of_find_icc_paths(struct device *dev, struct opp_table *opp_table)
+{
+ return -ENOTSUPP;
+}
#endif
#endif /* __LINUX_OPP_H__ */