On certain platforms (like TI), DVFS for a single device (CPU) requires configuring multiple power supplies.

The OPP bindings already contains binding and example to explain this case, but it isn't sufficient.

- There is no way for the code parsing these bindings to know which voltage values belong to which power supply.

- It is not possible to know the order in which the supplies need to be configured while switching OPPs.

This patch clarifies on those details by mentioning that such information is left for the implementation specific bindings to explain. They may want to hardcode such details or implement their own properties to get such information. All implementations using multiple regulators for their devices must provide a binding document explaining their implementation.

Signed-off-by: Viresh Kumar viresh.kumar@linaro.org Acked-by: Rob Herring robh@kernel.org Reviewed-by: Stephen Boyd sboyd@codeaurora.org --- Documentation/devicetree/bindings/opp/opp.txt | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt index f0239f68d186..9f5ca4457b5f 100644 --- a/Documentation/devicetree/bindings/opp/opp.txt +++ b/Documentation/devicetree/bindings/opp/opp.txt @@ -86,8 +86,14 @@ properties. Single entry is for target voltage and three entries are for <target min max> voltages.

- Entries for multiple regulators must be present in the same order as - regulators are specified in device's DT node. + Entries for multiple regulators shall be provided in the same field separated + by angular brackets <>. The OPP binding doesn't provide any provisions to + relate the values to their power supplies or the order in which the supplies + need to be configured and that is left for the implementation specific + binding. + + Entries for all regulators shall be of the same size, i.e. either all use a + single value or triplets.

- opp-microvolt-<name>: Named opp-microvolt property. This is exactly similar to the above opp-microvolt property, but allows multiple voltage ranges to be @@ -104,10 +110,13 @@ properties.

Should only be set if opp-microvolt is set for the OPP.

- Entries for multiple regulators must be present in the same order as - regulators are specified in device's DT node. If this property isn't required - 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. + Entries for multiple regulators shall be provided in the same field separated + by angular brackets <>. If current values aren't required for a regulator, + then it shall be filled with 0. If current values aren't required for any of + the regulators, then this field is not required. The OPP binding doesn't + provide any provisions to relate the values to their power supplies or the + order in which the supplies need to be configured and that is left for the + implementation specific binding.

- opp-microamp-<name>: Named opp-microamp property. Similar to opp-microvolt-<name> property, but for microamp instead.

This is a preparatory step for multiple regulator per device support. Move the voltage/current variables to a new structure.

Signed-off-by: Viresh Kumar viresh.kumar@linaro.org Tested-by: Dave Gerlach d-gerlach@ti.com Reviewed-by: Stephen Boyd sboyd@codeaurora.org --- drivers/base/power/opp/core.c | 44 +++++++++++++++++++++------------------- drivers/base/power/opp/debugfs.c | 8 ++++---- drivers/base/power/opp/of.c | 18 ++++++++-------- drivers/base/power/opp/opp.h | 11 +++------- include/linux/pm_opp.h | 16 +++++++++++++++ 5 files changed, 55 insertions(+), 42 deletions(-)

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index 705137da3954..f706a961815d 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -112,7 +112,7 @@ unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) if (IS_ERR_OR_NULL(tmp_opp)) pr_err("%s: Invalid parameters\n", __func__); else - v = tmp_opp->u_volt; + v = tmp_opp->supply.u_volt;

return v; } @@ -246,10 +246,10 @@ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) if (!opp->available) continue;

- if (opp->u_volt_min < min_uV) - min_uV = opp->u_volt_min; - if (opp->u_volt_max > max_uV) - max_uV = opp->u_volt_max; + if (opp->supply.u_volt_min < min_uV) + min_uV = opp->supply.u_volt_min; + if (opp->supply.u_volt_max > max_uV) + max_uV = opp->supply.u_volt_max; }

rcu_read_unlock(); @@ -637,14 +637,14 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) if (IS_ERR(old_opp)) { old_u_volt = 0; } else { - old_u_volt = old_opp->u_volt; - old_u_volt_min = old_opp->u_volt_min; - old_u_volt_max = old_opp->u_volt_max; + old_u_volt = old_opp->supply.u_volt; + old_u_volt_min = old_opp->supply.u_volt_min; + old_u_volt_max = old_opp->supply.u_volt_max; }

- u_volt = opp->u_volt; - u_volt_min = opp->u_volt_min; - u_volt_max = opp->u_volt_max; + u_volt = opp->supply.u_volt; + u_volt_min = opp->supply.u_volt_min; + u_volt_max = opp->supply.u_volt_max;

reg = opp_table->regulator;

@@ -957,10 +957,11 @@ static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, struct regulator *reg = opp_table->regulator;

if (!IS_ERR(reg) && - !regulator_is_supported_voltage(reg, opp->u_volt_min, - opp->u_volt_max)) { + !regulator_is_supported_voltage(reg, opp->supply.u_volt_min, + opp->supply.u_volt_max)) { pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", - __func__, opp->u_volt_min, opp->u_volt_max); + __func__, opp->supply.u_volt_min, + opp->supply.u_volt_max); return false; }

@@ -993,11 +994,12 @@ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,

/* Duplicate OPPs */ dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", - __func__, opp->rate, opp->u_volt, opp->available, - new_opp->rate, new_opp->u_volt, new_opp->available); + __func__, opp->rate, opp->supply.u_volt, + opp->available, new_opp->rate, new_opp->supply.u_volt, + new_opp->available);

- return opp->available && new_opp->u_volt == opp->u_volt ? - 0 : -EEXIST; + return opp->available && + new_opp->supply.u_volt == opp->supply.u_volt ? 0 : -EEXIST; }

new_opp->opp_table = opp_table; @@ -1064,9 +1066,9 @@ int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, /* populate the opp table */ new_opp->rate = freq; tol = u_volt * opp_table->voltage_tolerance_v1 / 100; - new_opp->u_volt = u_volt; - new_opp->u_volt_min = u_volt - tol; - new_opp->u_volt_max = u_volt + tol; + new_opp->supply.u_volt = u_volt; + new_opp->supply.u_volt_min = u_volt - tol; + new_opp->supply.u_volt_max = u_volt + tol; new_opp->available = true; new_opp->dynamic = dynamic;

diff --git a/drivers/base/power/opp/debugfs.c b/drivers/base/power/opp/debugfs.c index ef1ae6b52042..c897676ca35f 100644 --- a/drivers/base/power/opp/debugfs.c +++ b/drivers/base/power/opp/debugfs.c @@ -63,16 +63,16 @@ int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table) 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)) + if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d, &opp->supply.u_volt)) return -ENOMEM;

- if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d, &opp->u_volt_min)) + if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d, &opp->supply.u_volt_min)) return -ENOMEM;

- if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d, &opp->u_volt_max)) + if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d, &opp->supply.u_volt_max)) return -ENOMEM;

- if (!debugfs_create_ulong("u_amp", S_IRUGO, d, &opp->u_amp)) + if (!debugfs_create_ulong("u_amp", S_IRUGO, d, &opp->supply.u_amp)) return -ENOMEM;

if (!debugfs_create_ulong("clock_latency_ns", S_IRUGO, d, diff --git a/drivers/base/power/opp/of.c b/drivers/base/power/opp/of.c index 5b3755e49731..bdf409d42126 100644 --- a/drivers/base/power/opp/of.c +++ b/drivers/base/power/opp/of.c @@ -148,14 +148,14 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, return -EINVAL; }

- opp->u_volt = microvolt[0]; + opp->supply.u_volt = microvolt[0];

if (count == 1) { - opp->u_volt_min = opp->u_volt; - opp->u_volt_max = opp->u_volt; + opp->supply.u_volt_min = opp->supply.u_volt; + opp->supply.u_volt_max = opp->supply.u_volt; } else { - opp->u_volt_min = microvolt[1]; - opp->u_volt_max = microvolt[2]; + opp->supply.u_volt_min = microvolt[1]; + opp->supply.u_volt_max = microvolt[2]; }

/* Search for "opp-microamp-<name>" */ @@ -173,7 +173,7 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, }

if (prop && !of_property_read_u32(opp->np, name, &val)) - opp->u_amp = val; + opp->supply.u_amp = val;

return 0; } @@ -303,9 +303,9 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np) mutex_unlock(&opp_table_lock);

pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", - __func__, new_opp->turbo, new_opp->rate, new_opp->u_volt, - new_opp->u_volt_min, new_opp->u_volt_max, - new_opp->clock_latency_ns); + __func__, new_opp->turbo, new_opp->rate, + new_opp->supply.u_volt, new_opp->supply.u_volt_min, + new_opp->supply.u_volt_max, new_opp->clock_latency_ns);

/* * Notify the changes in the availability of the operable diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h index 96cd30ac6c1d..8a02516542c2 100644 --- a/drivers/base/power/opp/opp.h +++ b/drivers/base/power/opp/opp.h @@ -61,10 +61,7 @@ extern struct list_head opp_tables; * @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 - * @u_volt_max: Maximum voltage in microvolts corresponding to this OPP - * @u_amp: Maximum current drawn by the device in microamperes + * @supply: Power supply voltage/current values * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's * frequency from any other OPP's frequency. * @opp_table: points back to the opp_table struct this opp belongs to @@ -83,10 +80,8 @@ struct dev_pm_opp { bool suspend; unsigned long rate;

- unsigned long u_volt; - unsigned long u_volt_min; - unsigned long u_volt_max; - unsigned long u_amp; + struct dev_pm_opp_supply supply; + unsigned long clock_latency_ns;

struct opp_table *opp_table; diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index f6bc76501912..824f7268f687 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -25,6 +25,22 @@ enum dev_pm_opp_event { OPP_EVENT_ADD, OPP_EVENT_REMOVE, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE, };

+/** + * struct dev_pm_opp_supply - Power supply voltage/current values + * @u_volt: Target voltage in microvolts corresponding to this OPP + * @u_volt_min: Minimum voltage in microvolts corresponding to this OPP + * @u_volt_max: Maximum voltage in microvolts corresponding to this OPP + * @u_amp: Maximum current drawn by the device in microamperes + * + * This structure stores the voltage/current values for a single power supply. + */ +struct dev_pm_opp_supply { + unsigned long u_volt; + unsigned long u_volt_min; + unsigned long u_volt_max; + unsigned long u_amp; +}; + #if defined(CONFIG_PM_OPP)

unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);

This patch adds infrastructure to manage multiple regulators and updates the only user (cpufreq-dt) of dev_pm_opp_set{put}_regulator().

This is preparatory work for adding full support for devices with multiple regulators.

Signed-off-by: Viresh Kumar viresh.kumar@linaro.org Tested-by: Dave Gerlach d-gerlach@ti.com

--- V4->V5: - Don't allocate from within rcu locked section. - s/+// --- drivers/base/power/opp/core.c | 245 +++++++++++++++++++++++++++------------ drivers/base/power/opp/debugfs.c | 52 +++++++-- drivers/base/power/opp/of.c | 103 +++++++++++----- drivers/base/power/opp/opp.h | 10 +- drivers/cpufreq/cpufreq-dt.c | 9 +- include/linux/pm_opp.h | 8 +- 6 files changed, 302 insertions(+), 125 deletions(-)

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index 8328ff06cc08..f0dd0bd29ce8 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -93,6 +93,8 @@ struct opp_table *_find_opp_table(struct device *dev) * Return: voltage in micro volt corresponding to the opp, else * return 0 * + * This is useful only for devices with single power supply. + * * Locking: This function must be called under rcu_read_lock(). opp is a rcu * protected pointer. This means that opp which could have been fetched by * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are @@ -112,7 +114,7 @@ unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) if (IS_ERR_OR_NULL(tmp_opp)) pr_err("%s: Invalid parameters\n", __func__); else - v = tmp_opp->supply.u_volt; + v = tmp_opp->supplies[0].u_volt;

return v; } @@ -210,6 +212,24 @@ unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) } EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);

+static int _get_regulator_count(struct device *dev) +{ + struct opp_table *opp_table; + int count; + + rcu_read_lock(); + + opp_table = _find_opp_table(dev); + if (!IS_ERR(opp_table)) + count = opp_table->regulator_count; + else + count = 0; + + rcu_read_unlock(); + + return count; +} + /** * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds * @dev: device for which we do this operation @@ -222,34 +242,51 @@ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) { struct opp_table *opp_table; struct dev_pm_opp *opp; - struct regulator *reg; + struct regulator *reg, **regulators; unsigned long latency_ns = 0; - unsigned long min_uV = ~0, max_uV = 0; - int ret; + int ret, i, count; + struct { + unsigned long min; + unsigned long max; + } *uV; + + count = _get_regulator_count(dev); + + /* Regulator may not be required for the device */ + if (!count) + return 0; + + regulators = kmalloc_array(count, sizeof(*regulators), GFP_KERNEL); + if (!regulators) + return 0; + + uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL); + if (!uV) + goto free_regulators;

rcu_read_lock();

opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) { rcu_read_unlock(); - return 0; + goto free_uV; }

- reg = opp_table->regulator; - if (IS_ERR(reg)) { - /* Regulator may not be required for device */ - rcu_read_unlock(); - return 0; - } + memcpy(regulators, opp_table->regulators, count * sizeof(*regulators));

- list_for_each_entry_rcu(opp, &opp_table->opp_list, node) { - if (!opp->available) - continue; + for (i = 0; i < count; i++) { + uV[i].min = ~0; + uV[i].max = 0; + + list_for_each_entry_rcu(opp, &opp_table->opp_list, node) { + if (!opp->available) + continue;

- if (opp->supply.u_volt_min < min_uV) - min_uV = opp->supply.u_volt_min; - if (opp->supply.u_volt_max > max_uV) - max_uV = opp->supply.u_volt_max; + if (opp->supplies[i].u_volt_min < uV[i].min) + uV[i].min = opp->supplies[i].u_volt_min; + if (opp->supplies[i].u_volt_max > uV[i].max) + uV[i].max = opp->supplies[i].u_volt_max; + } }

rcu_read_unlock(); @@ -258,9 +295,16 @@ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) * The caller needs to ensure that opp_table (and hence the regulator) * isn't freed, while we are executing this routine. */ - ret = regulator_set_voltage_time(reg, min_uV, max_uV); - if (ret > 0) - latency_ns = ret * 1000; + for (i = 0; reg = regulators[i], i < count; i++) { + ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max); + if (ret > 0) + latency_ns += ret * 1000; + } + +free_uV: + kfree(uV); +free_regulators: + kfree(regulators);

return latency_ns; } @@ -580,7 +624,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) { struct opp_table *opp_table; struct dev_pm_opp *old_opp, *opp; - struct regulator *reg; + struct regulator *reg = ERR_PTR(-ENXIO); struct clk *clk; unsigned long freq, old_freq; struct dev_pm_opp_supply old_supply, new_supply; @@ -633,14 +677,23 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) return ret; }

+ if (opp_table->regulators) { + /* This function only supports single regulator per device */ + if (WARN_ON(opp_table->regulator_count > 1)) { + dev_err(dev, "multiple regulators not supported\n"); + rcu_read_unlock(); + return -EINVAL; + } + + reg = opp_table->regulators[0]; + } + if (IS_ERR(old_opp)) old_supply.u_volt = 0; else - memcpy(&old_supply, &old_opp->supply, sizeof(old_supply)); + memcpy(&old_supply, old_opp->supplies, sizeof(old_supply));

- memcpy(&new_supply, &opp->supply, sizeof(new_supply)); - - reg = opp_table->regulator; + memcpy(&new_supply, opp->supplies, sizeof(new_supply));

rcu_read_unlock();

@@ -764,9 +817,6 @@ static struct opp_table *_add_opp_table(struct device *dev)

_of_init_opp_table(opp_table, dev);

- /* Set regulator to a non-NULL error value */ - opp_table->regulator = ERR_PTR(-ENXIO); - /* Find clk for the device */ opp_table->clk = clk_get(dev, NULL); if (IS_ERR(opp_table->clk)) { @@ -815,7 +865,7 @@ static void _remove_opp_table(struct opp_table *opp_table) if (opp_table->prop_name) return;

- if (!IS_ERR(opp_table->regulator)) + if (opp_table->regulators) return;

/* Release clk */ @@ -924,35 +974,50 @@ struct dev_pm_opp *_allocate_opp(struct device *dev, struct opp_table **opp_table) { struct dev_pm_opp *opp; + int count, supply_size; + struct opp_table *table;

- /* allocate new OPP node */ - opp = kzalloc(sizeof(*opp), GFP_KERNEL); - if (!opp) + table = _add_opp_table(dev); + if (!table) return NULL;

- INIT_LIST_HEAD(&opp->node); + /* Allocate space for at least one supply */ + count = table->regulator_count ? table->regulator_count : 1; + supply_size = sizeof(*opp->supplies) * count;

- *opp_table = _add_opp_table(dev); - if (!*opp_table) { - kfree(opp); + /* allocate new OPP node and supplies structures */ + opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL); + if (!opp) { + kfree(table); 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); + INIT_LIST_HEAD(&opp->node); + + *opp_table = table; + return opp; }

static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, struct opp_table *opp_table) { - struct regulator *reg = opp_table->regulator; - - if (!IS_ERR(reg) && - !regulator_is_supported_voltage(reg, opp->supply.u_volt_min, - opp->supply.u_volt_max)) { - pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", - __func__, opp->supply.u_volt_min, - opp->supply.u_volt_max); - return false; + struct regulator *reg; + int i; + + for (i = 0; i < opp_table->regulator_count; i++) { + reg = opp_table->regulators[i]; + + if (!regulator_is_supported_voltage(reg, + opp->supplies[i].u_volt_min, + opp->supplies[i].u_volt_max)) { + pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", + __func__, opp->supplies[i].u_volt_min, + opp->supplies[i].u_volt_max); + return false; + } }

return true; @@ -984,12 +1049,13 @@ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,

/* Duplicate OPPs */ dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", - __func__, opp->rate, opp->supply.u_volt, - opp->available, new_opp->rate, new_opp->supply.u_volt, - new_opp->available); + __func__, opp->rate, opp->supplies[0].u_volt, + opp->available, new_opp->rate, + new_opp->supplies[0].u_volt, new_opp->available);

+ /* Should we compare voltages for all regulators here ? */ return opp->available && - new_opp->supply.u_volt == opp->supply.u_volt ? 0 : -EEXIST; + new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? 0 : -EEXIST; }

new_opp->opp_table = opp_table; @@ -1056,9 +1122,9 @@ int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, /* populate the opp table */ new_opp->rate = freq; tol = u_volt * opp_table->voltage_tolerance_v1 / 100; - new_opp->supply.u_volt = u_volt; - new_opp->supply.u_volt_min = u_volt - tol; - new_opp->supply.u_volt_max = u_volt + tol; + new_opp->supplies[0].u_volt = u_volt; + new_opp->supplies[0].u_volt_min = u_volt - tol; + new_opp->supplies[0].u_volt_max = u_volt + tol; new_opp->available = true; new_opp->dynamic = dynamic;

@@ -1303,12 +1369,14 @@ void dev_pm_opp_put_prop_name(struct device *dev) EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);

/** - * dev_pm_opp_set_regulator() - Set regulator name for the device + * dev_pm_opp_set_regulators() - Set regulator names for the device * @dev: Device for which regulator name is being set. - * @name: Name of the regulator. + * @names: Array of pointers to the names of the regulator. + * @count: Number of regulators. * * In order to support OPP switching, OPP layer needs to know the name of the - * device's regulator, as the core would be required to switch voltages as well. + * device's regulators, as the core would be required to switch voltages as + * well. * * This must be called before any OPPs are initialized for the device. * @@ -1318,10 +1386,13 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name); * that this function is *NOT* called under RCU protection or in contexts where * mutex cannot be locked. */ -struct opp_table *dev_pm_opp_set_regulator(struct device *dev, const char *name) +struct opp_table *dev_pm_opp_set_regulators(struct device *dev, + const char * const names[], + unsigned int count) { struct opp_table *opp_table; struct regulator *reg; + int ret, i;

mutex_lock(&opp_table_lock);

@@ -1337,26 +1408,44 @@ struct opp_table *dev_pm_opp_set_regulator(struct device *dev, const char *name) goto err; }

- /* Already have a regulator set */ - if (WARN_ON(!IS_ERR(opp_table->regulator))) { + /* Already have regulators set */ + if (WARN_ON(opp_table->regulators)) { opp_table = ERR_PTR(-EBUSY); goto err; } - /* Allocate the regulator */ - reg = regulator_get_optional(dev, name); - if (IS_ERR(reg)) { - opp_table = (struct opp_table *)reg; - if (PTR_ERR(reg) != -EPROBE_DEFER) - dev_err(dev, "%s: no regulator (%s) found: %ld\n", - __func__, name, PTR_ERR(reg)); + + opp_table->regulators = kmalloc_array(count, + sizeof(*opp_table->regulators), + GFP_KERNEL); + if (!opp_table->regulators) { + opp_table = ERR_PTR(-ENOMEM); goto err; }

- opp_table->regulator = reg; + for (i = 0; i < count; i++) { + reg = regulator_get_optional(dev, names[i]); + if (IS_ERR(reg)) { + opp_table = (struct opp_table *)reg; + if (PTR_ERR(reg) != -EPROBE_DEFER) + dev_err(dev, "%s: no regulator (%s) found: %ld\n", + __func__, names[i], PTR_ERR(reg)); + goto free_regulators; + } + + opp_table->regulators[i] = reg; + } + + opp_table->regulator_count = count;

mutex_unlock(&opp_table_lock); return opp_table;

+free_regulators: + while (i != 0) + regulator_put(opp_table->regulators[--i]); + + kfree(opp_table->regulators); + opp_table->regulators = NULL; err: _remove_opp_table(opp_table); unlock: @@ -1364,10 +1453,10 @@ struct opp_table *dev_pm_opp_set_regulator(struct device *dev, const char *name)

return opp_table; } -EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulator); +EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators);

/** - * dev_pm_opp_put_regulator() - Releases resources blocked for regulator + * dev_pm_opp_put_regulators() - Releases resources blocked for regulators * @opp_table: opp_table returned from dev_pm_opp_set_regulator * * Locking: The internal opp_table and opp structures are RCU protected. @@ -1376,20 +1465,26 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulator); * that this function is *NOT* called under RCU protection or in contexts where * mutex cannot be locked. */ -void dev_pm_opp_put_regulator(struct opp_table *opp_table) +void dev_pm_opp_put_regulators(struct opp_table *opp_table) { + int i; + mutex_lock(&opp_table_lock);

- if (IS_ERR(opp_table->regulator)) { - pr_err("%s: Doesn't have regulator set\n", __func__); + if (!opp_table->regulators) { + pr_err("%s: Doesn't have regulators set\n", __func__); goto unlock; }

/* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list));

- regulator_put(opp_table->regulator); - opp_table->regulator = ERR_PTR(-ENXIO); + for (i = opp_table->regulator_count - 1; i >= 0; i--) + regulator_put(opp_table->regulators[i]); + + kfree(opp_table->regulators); + opp_table->regulators = NULL; + opp_table->regulator_count = 0;

/* Try freeing opp_table if this was the last blocking resource */ _remove_opp_table(opp_table); @@ -1397,7 +1492,7 @@ void dev_pm_opp_put_regulator(struct opp_table *opp_table) unlock: mutex_unlock(&opp_table_lock); } -EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulator); +EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators);

/** * dev_pm_opp_add() - Add an OPP table from a table definitions diff --git a/drivers/base/power/opp/debugfs.c b/drivers/base/power/opp/debugfs.c index c897676ca35f..95f433db4ac7 100644 --- a/drivers/base/power/opp/debugfs.c +++ b/drivers/base/power/opp/debugfs.c @@ -15,6 +15,7 @@ #include <linux/err.h> #include <linux/init.h> #include <linux/limits.h> +#include <linux/slab.h>

#include "opp.h"

@@ -34,6 +35,46 @@ void opp_debug_remove_one(struct dev_pm_opp *opp) debugfs_remove_recursive(opp->dentry); }

+static bool opp_debug_create_supplies(struct dev_pm_opp *opp, + struct opp_table *opp_table, + struct dentry *pdentry) +{ + struct dentry *d; + int i = 0; + char *name; + + /* Always create at least supply-0 directory */ + do { + name = kasprintf(GFP_KERNEL, "supply-%d", i); + + /* Create per-opp directory */ + d = debugfs_create_dir(name, pdentry); + + kfree(name); + + if (!d) + return false; + + if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d, + &opp->supplies[i].u_volt)) + return false; + + if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d, + &opp->supplies[i].u_volt_min)) + return false; + + if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d, + &opp->supplies[i].u_volt_max)) + return false; + + if (!debugfs_create_ulong("u_amp", S_IRUGO, d, + &opp->supplies[i].u_amp)) + return false; + } while (++i < opp_table->regulator_count); + + return true; +} + int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table) { struct dentry *pdentry = opp_table->dentry; @@ -63,16 +104,7 @@ int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table) if (!debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate)) return -ENOMEM;

- if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d, &opp->supply.u_volt)) - return -ENOMEM; - - if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d, &opp->supply.u_volt_min)) - return -ENOMEM; - - if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d, &opp->supply.u_volt_max)) - return -ENOMEM; - - if (!debugfs_create_ulong("u_amp", S_IRUGO, d, &opp->supply.u_amp)) + if (!opp_debug_create_supplies(opp, opp_table, d)) return -ENOMEM;

if (!debugfs_create_ulong("clock_latency_ns", S_IRUGO, d, diff --git a/drivers/base/power/opp/of.c b/drivers/base/power/opp/of.c index bdf409d42126..3f7d2591b173 100644 --- a/drivers/base/power/opp/of.c +++ b/drivers/base/power/opp/of.c @@ -17,6 +17,7 @@ #include <linux/errno.h> #include <linux/device.h> #include <linux/of.h> +#include <linux/slab.h> #include <linux/export.h>

#include "opp.h" @@ -101,16 +102,16 @@ static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table, return true; }

-/* TODO: Support multiple regulators */ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, struct opp_table *opp_table) { - u32 microvolt[3] = {0}; - u32 val; - int count, ret; + u32 *microvolt, *microamp = NULL; + int supplies, vcount, icount, ret, i, j; struct property *prop = NULL; char name[NAME_MAX];

+ supplies = opp_table->regulator_count ? opp_table->regulator_count : 1; + /* Search for "opp-microvolt-<name>" */ if (opp_table->prop_name) { snprintf(name, sizeof(name), "opp-microvolt-%s", @@ -128,34 +129,29 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, return 0; }

- count = of_property_count_u32_elems(opp->np, name); - if (count < 0) { + vcount = of_property_count_u32_elems(opp->np, name); + if (vcount < 0) { dev_err(dev, "%s: Invalid %s property (%d)\n", - __func__, name, count); - return count; + __func__, name, vcount); + return vcount; }

- /* There can be one or three elements here */ - if (count != 1 && count != 3) { - dev_err(dev, "%s: Invalid number of elements in %s property (%d)\n", - __func__, name, count); + /* There can be one or three elements per supply */ + if (vcount != supplies && vcount != supplies * 3) { + dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", + __func__, name, vcount, supplies); return -EINVAL; }

- ret = of_property_read_u32_array(opp->np, name, microvolt, count); + microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL); + if (!microvolt) + return -ENOMEM; + + ret = of_property_read_u32_array(opp->np, name, microvolt, vcount); if (ret) { dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret); - return -EINVAL; - } - - opp->supply.u_volt = microvolt[0]; - - if (count == 1) { - opp->supply.u_volt_min = opp->supply.u_volt; - opp->supply.u_volt_max = opp->supply.u_volt; - } else { - opp->supply.u_volt_min = microvolt[1]; - opp->supply.u_volt_max = microvolt[2]; + ret = -EINVAL; + goto free_microvolt; }

/* Search for "opp-microamp-<name>" */ @@ -172,10 +168,59 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, prop = of_find_property(opp->np, name, NULL); }

- if (prop && !of_property_read_u32(opp->np, name, &val)) - opp->supply.u_amp = val; + if (prop) { + icount = of_property_count_u32_elems(opp->np, name); + if (icount < 0) { + dev_err(dev, "%s: Invalid %s property (%d)\n", __func__, + name, icount); + ret = icount; + goto free_microvolt; + }

- return 0; + if (icount != supplies) { + dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", + __func__, name, icount, supplies); + ret = -EINVAL; + goto free_microvolt; + } + + microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL); + if (!microamp) { + ret = -EINVAL; + goto free_microvolt; + } + + ret = of_property_read_u32_array(opp->np, name, microamp, + icount); + if (ret) { + dev_err(dev, "%s: error parsing %s: %d\n", __func__, + name, ret); + ret = -EINVAL; + goto free_microamp; + } + } + + for (i = 0, j = 0; i < supplies; i++) { + opp->supplies[i].u_volt = microvolt[j++]; + + if (vcount == supplies) { + opp->supplies[i].u_volt_min = opp->supplies[i].u_volt; + opp->supplies[i].u_volt_max = opp->supplies[i].u_volt; + } else { + opp->supplies[i].u_volt_min = microvolt[j++]; + opp->supplies[i].u_volt_max = microvolt[j++]; + } + + if (microamp) + opp->supplies[i].u_amp = microamp[i]; + } + +free_microamp: + kfree(microamp); +free_microvolt: + kfree(microvolt); + + return ret; }

/** @@ -304,8 +349,8 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)

pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", __func__, new_opp->turbo, new_opp->rate, - new_opp->supply.u_volt, new_opp->supply.u_volt_min, - new_opp->supply.u_volt_max, new_opp->clock_latency_ns); + new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min, + new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns);

/* * Notify the changes in the availability of the operable diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h index 8a02516542c2..5b0f7e53bede 100644 --- a/drivers/base/power/opp/opp.h +++ b/drivers/base/power/opp/opp.h @@ -61,7 +61,7 @@ extern struct list_head opp_tables; * @turbo: true if turbo (boost) OPP * @suspend: true if suspend OPP * @rate: Frequency in hertz - * @supply: Power supply voltage/current values + * @supplies: Power supplies voltage/current values * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's * frequency from any other OPP's frequency. * @opp_table: points back to the opp_table struct this opp belongs to @@ -80,7 +80,7 @@ struct dev_pm_opp { bool suspend; unsigned long rate;

- struct dev_pm_opp_supply supply; + struct dev_pm_opp_supply *supplies;

unsigned long clock_latency_ns;

@@ -139,7 +139,8 @@ enum opp_table_access { * @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 + * @regulators: Supply regulators + * @regulator_count: Number of power supply regulators * @dentry: debugfs dentry pointer of the real device directory (not links). * @dentry_name: Name of the real dentry. * @@ -174,7 +175,8 @@ struct opp_table { unsigned int supported_hw_count; const char *prop_name; struct clk *clk; - struct regulator *regulator; + struct regulator **regulators; + unsigned int regulator_count;

#ifdef CONFIG_DEBUG_FS struct dentry *dentry; diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c index 4d3ec92cbabf..1cd1fcfe835a 100644 --- a/drivers/cpufreq/cpufreq-dt.c +++ b/drivers/cpufreq/cpufreq-dt.c @@ -188,7 +188,10 @@ static int cpufreq_init(struct cpufreq_policy *policy) */ name = find_supply_name(cpu_dev); if (name) { - opp_table = dev_pm_opp_set_regulator(cpu_dev, name); + const char *names[] = {name}; + + opp_table = dev_pm_opp_set_regulators(cpu_dev, names, + ARRAY_SIZE(names)); if (IS_ERR(opp_table)) { ret = PTR_ERR(opp_table); dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n", @@ -289,7 +292,7 @@ static int cpufreq_init(struct cpufreq_policy *policy) out_free_opp: dev_pm_opp_of_cpumask_remove_table(policy->cpus); if (name) - dev_pm_opp_put_regulator(opp_table); + dev_pm_opp_put_regulators(opp_table); out_put_clk: clk_put(cpu_clk);

@@ -304,7 +307,7 @@ static int cpufreq_exit(struct cpufreq_policy *policy) 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->opp_table); + dev_pm_opp_put_regulators(priv->opp_table);

clk_put(policy->clk); kfree(priv); diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index 824f7268f687..9a825ae78653 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -79,8 +79,8 @@ int dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, 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); -struct opp_table *dev_pm_opp_set_regulator(struct device *dev, const char *name); -void dev_pm_opp_put_regulator(struct opp_table *opp_table); +struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count); +void dev_pm_opp_put_regulators(struct opp_table *opp_table); int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq); int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask); int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask); @@ -187,12 +187,12 @@ static inline int dev_pm_opp_set_prop_name(struct device *dev, const char *name)

static inline void dev_pm_opp_put_prop_name(struct device *dev) {}

-static inline struct opp_table *dev_pm_opp_set_regulator(struct device *dev, const char *name) +static inline struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count) { return ERR_PTR(-ENOTSUPP); }

-static inline void dev_pm_opp_put_regulator(struct opp_table *opp_table) {} +static inline void dev_pm_opp_put_regulators(struct opp_table *opp_table) {}

static inline int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) {

Later patches would add support for custom set_opp() callbacks. This patch separates out the code for _generic_set_opp() handler in order to prepare for that.

Signed-off-by: Viresh Kumar viresh.kumar@linaro.org Tested-by: Dave Gerlach d-gerlach@ti.com Reviewed-by: Stephen Boyd sboyd@codeaurora.org

--- V4->V5: - Make 'dev' part of struct dev_pm_set_opp_data - Fix commit log: s/opp_set_rate/set_opp - Same in a comment as well --- drivers/base/power/opp/core.c | 181 +++++++++++++++++++++++++++++------------- drivers/base/power/opp/opp.h | 3 + include/linux/pm_opp.h | 35 ++++++++ 3 files changed, 166 insertions(+), 53 deletions(-)

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index f0dd0bd29ce8..0a53ae132d7f 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -610,6 +610,69 @@ static int _set_opp_voltage(struct device *dev, struct regulator *reg, return ret; }

+static inline int +_generic_set_opp_clk_only(struct device *dev, struct clk *clk, + unsigned long old_freq, unsigned long freq) +{ + int ret; + + ret = clk_set_rate(clk, freq); + if (ret) { + dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, + ret); + } + + return ret; +} + +static int _generic_set_opp(struct dev_pm_set_opp_data *data) +{ + struct dev_pm_opp_supply *old_supply = data->old_opp.supplies; + struct dev_pm_opp_supply *new_supply = data->new_opp.supplies; + unsigned long old_freq = data->old_opp.rate, freq = data->new_opp.rate; + struct regulator *reg = data->regulators[0]; + struct device *dev= data->dev; + int ret; + + /* This function only supports single regulator per device */ + if (WARN_ON(data->regulator_count > 1)) { + dev_err(dev, "multiple regulators are not supported\n"); + return -EINVAL; + } + + /* Scaling up? Scale voltage before frequency */ + if (freq > old_freq) { + ret = _set_opp_voltage(dev, reg, new_supply); + if (ret) + goto restore_voltage; + } + + /* Change frequency */ + ret = _generic_set_opp_clk_only(dev, data->clk, old_freq, freq); + if (ret) + goto restore_voltage; + + /* Scaling down? Scale voltage after frequency */ + if (freq < old_freq) { + ret = _set_opp_voltage(dev, reg, new_supply); + if (ret) + goto restore_freq; + } + + return 0; + +restore_freq: + if (_generic_set_opp_clk_only(dev, data->clk, freq, old_freq)) + dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", + __func__, old_freq); +restore_voltage: + /* This shouldn't harm even if the voltages weren't updated earlier */ + if (old_supply->u_volt) + _set_opp_voltage(dev, reg, old_supply); + + return ret; +} + /** * dev_pm_opp_set_rate() - Configure new OPP based on frequency * @dev: device for which we do this operation @@ -623,12 +686,12 @@ static int _set_opp_voltage(struct device *dev, struct regulator *reg, int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) { struct opp_table *opp_table; + unsigned long freq, old_freq; struct dev_pm_opp *old_opp, *opp; - struct regulator *reg = ERR_PTR(-ENXIO); + struct regulator **regulators; + struct dev_pm_set_opp_data *data; struct clk *clk; - unsigned long freq, old_freq; - struct dev_pm_opp_supply old_supply, new_supply; - int ret; + int ret, size;

if (unlikely(!target_freq)) { dev_err(dev, "%s: Invalid target frequency %lu\n", __func__, @@ -677,64 +740,36 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) return ret; }

- if (opp_table->regulators) { - /* This function only supports single regulator per device */ - if (WARN_ON(opp_table->regulator_count > 1)) { - dev_err(dev, "multiple regulators not supported\n"); - rcu_read_unlock(); - return -EINVAL; - } + dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__, + old_freq, freq);

- reg = opp_table->regulators[0]; + regulators = opp_table->regulators; + + /* Only frequency scaling */ + if (!regulators) { + rcu_read_unlock(); + return _generic_set_opp_clk_only(dev, clk, old_freq, freq); }

+ data = opp_table->set_opp_data; + data->regulators = regulators; + data->regulator_count = opp_table->regulator_count; + data->clk = clk; + data->dev = dev; + + data->old_opp.rate = old_freq; + size = sizeof(*opp->supplies) * opp_table->regulator_count; if (IS_ERR(old_opp)) - old_supply.u_volt = 0; + memset(data->old_opp.supplies, 0, size); else - memcpy(&old_supply, old_opp->supplies, sizeof(old_supply)); + memcpy(data->old_opp.supplies, old_opp->supplies, size);

- memcpy(&new_supply, opp->supplies, sizeof(new_supply)); + data->new_opp.rate = freq; + memcpy(data->new_opp.supplies, opp->supplies, size);

rcu_read_unlock();

- /* Scaling up? Scale voltage before frequency */ - if (freq > old_freq) { - ret = _set_opp_voltage(dev, reg, &new_supply); - if (ret) - goto restore_voltage; - } - - /* Change frequency */ - - dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", - __func__, old_freq, freq); - - ret = clk_set_rate(clk, freq); - if (ret) { - dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, - ret); - goto restore_voltage; - } - - /* Scaling down? Scale voltage after frequency */ - if (freq < old_freq) { - ret = _set_opp_voltage(dev, reg, &new_supply); - if (ret) - goto restore_freq; - } - - return 0; - -restore_freq: - if (clk_set_rate(clk, old_freq)) - dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", - __func__, old_freq); -restore_voltage: - /* This shouldn't harm even if the voltages weren't updated earlier */ - if (old_supply.u_volt) - _set_opp_voltage(dev, reg, &old_supply); - - return ret; + return _generic_set_opp(data); } EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);

@@ -1368,6 +1403,38 @@ void dev_pm_opp_put_prop_name(struct device *dev) } EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);

+static int _allocate_set_opp_data(struct opp_table *opp_table) +{ + struct dev_pm_set_opp_data *data; + int len, count = opp_table->regulator_count; + + if (WARN_ON(!count)) + return -EINVAL; + + /* space for set_opp_data */ + len = sizeof(*data); + + /* space for old_opp.supplies and new_opp.supplies */ + len += 2 * sizeof(struct dev_pm_opp_supply) * count; + + data = kzalloc(len, GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->old_opp.supplies = (void *)(data + 1); + data->new_opp.supplies = data->old_opp.supplies + count; + + opp_table->set_opp_data = data; + + return 0; +} + +static void _free_set_opp_data(struct opp_table *opp_table) +{ + kfree(opp_table->set_opp_data); + opp_table->set_opp_data = NULL; +} + /** * dev_pm_opp_set_regulators() - Set regulator names for the device * @dev: Device for which regulator name is being set. @@ -1437,6 +1504,11 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev,

opp_table->regulator_count = count;

+ /* Allocate block only once to pass to set_opp() routines */ + ret = _allocate_set_opp_data(opp_table); + if (ret) + goto free_regulators; + mutex_unlock(&opp_table_lock); return opp_table;

@@ -1446,6 +1518,7 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev,

kfree(opp_table->regulators); opp_table->regulators = NULL; + opp_table->regulator_count = 0; err: _remove_opp_table(opp_table); unlock: @@ -1482,6 +1555,8 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table) for (i = opp_table->regulator_count - 1; i >= 0; i--) regulator_put(opp_table->regulators[i]);

+ _free_set_opp_data(opp_table); + kfree(opp_table->regulators); opp_table->regulators = NULL; opp_table->regulator_count = 0; diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h index 5b0f7e53bede..a05e43912c6b 100644 --- a/drivers/base/power/opp/opp.h +++ b/drivers/base/power/opp/opp.h @@ -141,6 +141,7 @@ enum opp_table_access { * @clk: Device's clock handle * @regulators: Supply regulators * @regulator_count: Number of power supply regulators + * @set_opp_data: Data to be passed to set_opp callback * @dentry: debugfs dentry pointer of the real device directory (not links). * @dentry_name: Name of the real dentry. * @@ -178,6 +179,8 @@ struct opp_table { struct regulator **regulators; unsigned int regulator_count;

+ struct dev_pm_set_opp_data *set_opp_data; + #ifdef CONFIG_DEBUG_FS struct dentry *dentry; char dentry_name[NAME_MAX]; diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index 9a825ae78653..779b40a9287d 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -17,6 +17,8 @@ #include <linux/err.h> #include <linux/notifier.h>

+struct clk; +struct regulator; struct dev_pm_opp; struct device; struct opp_table; @@ -41,6 +43,39 @@ struct dev_pm_opp_supply { unsigned long u_amp; };

+/** + * 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 + * + * This structure stores the freq/voltage/current values for a single OPP. + */ +struct dev_pm_opp_info { + unsigned long rate; + struct dev_pm_opp_supply *supplies; +}; + +/** + * struct dev_pm_set_opp_data - Set OPP data + * @old_opp: Old OPP info + * @new_opp: New OPP info + * @regulators: Array of regulator pointers + * @regulator_count: Number of regulators + * @clk: Pointer to clk + * @dev: Pointer to the struct device + * + * This structure contains all information required for setting an OPP. + */ +struct dev_pm_set_opp_data { + struct dev_pm_opp_info old_opp; + struct dev_pm_opp_info new_opp; + + struct regulator **regulators; + unsigned int regulator_count; + struct clk *clk; + struct device *dev; +}; + #if defined(CONFIG_PM_OPP)

unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);

If a platform specific OPP driver has called this routine first and set the regulators, then the second call from cpufreq-dt driver will hit the WARN_ON(). Remove the WARN_ON(), but continue to return error in such cases.

Signed-off-by: Viresh Kumar viresh.kumar@linaro.org Reviewed-by: Stephen Boyd sboyd@codeaurora.org Tested-by: Dave Gerlach d-gerlach@ti.com --- drivers/base/power/opp/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index 1fb188b424c7..f60d7f943b64 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -1485,7 +1485,7 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev, }

/* Already have regulators set */ - if (WARN_ON(opp_table->regulators)) { + if (opp_table->regulators) { opp_table = ERR_PTR(-EBUSY); goto err; }