diff options
author | Lukasz Luba <lukasz.luba@arm.com> | 2020-05-27 10:58:54 +0100 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-06-24 17:16:42 +0200 |
commit | 0e0ffa855d1590e54ec0033404a49e2e57e294fe (patch) | |
tree | 2e313af4cb629121ac00a7eab7dfe5715a6f2ff0 /drivers/opp | |
parent | 7b7570ad0d76410bdefe61d77aa624900e2396ce (diff) | |
download | linux-0e0ffa855d1590e54ec0033404a49e2e57e294fe.tar.bz2 |
OPP: refactor dev_pm_opp_of_register_em() and update related drivers
The Energy Model framework supports not only CPU devices. Drop the CPU
specific interface with cpumask and add struct device. Add also a return
value, user might use it. This new interface provides easy way to create
a simple Energy Model, which then might be used by e.g. thermal subsystem.
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/opp')
-rw-r--r-- | drivers/opp/of.c | 71 |
1 files changed, 45 insertions, 26 deletions
diff --git a/drivers/opp/of.c b/drivers/opp/of.c index e273f419a4bf..4aa42739599e 100644 --- a/drivers/opp/of.c +++ b/drivers/opp/of.c @@ -1205,18 +1205,18 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node); /* * Callback function provided to the Energy Model framework upon registration. - * This computes the power estimated by @CPU at @kHz if it is the frequency + * This computes the power estimated by @dev at @kHz if it is the frequency * of an existing OPP, or at the frequency of the first OPP above @kHz otherwise * (see dev_pm_opp_find_freq_ceil()). This function updates @kHz to the ceiled * frequency and @mW to the associated power. The power is estimated as - * P = C * V^2 * f with C being the CPU's capacitance and V and f respectively - * the voltage and frequency of the OPP. + * P = C * V^2 * f with C being the device's capacitance and V and f + * respectively the voltage and frequency of the OPP. * - * Returns -ENODEV if the CPU device cannot be found, -EINVAL if the power - * calculation failed because of missing parameters, 0 otherwise. + * Returns -EINVAL if the power calculation failed because of missing + * parameters, 0 otherwise. */ -static int __maybe_unused _get_cpu_power(unsigned long *mW, unsigned long *kHz, - struct device *cpu_dev) +static int __maybe_unused _get_power(unsigned long *mW, unsigned long *kHz, + struct device *dev) { struct dev_pm_opp *opp; struct device_node *np; @@ -1225,7 +1225,7 @@ static int __maybe_unused _get_cpu_power(unsigned long *mW, unsigned long *kHz, u64 tmp; int ret; - np = of_node_get(cpu_dev->of_node); + np = of_node_get(dev->of_node); if (!np) return -EINVAL; @@ -1235,7 +1235,7 @@ static int __maybe_unused _get_cpu_power(unsigned long *mW, unsigned long *kHz, return -EINVAL; Hz = *kHz * 1000; - opp = dev_pm_opp_find_freq_ceil(cpu_dev, &Hz); + opp = dev_pm_opp_find_freq_ceil(dev, &Hz); if (IS_ERR(opp)) return -EINVAL; @@ -1255,30 +1255,38 @@ static int __maybe_unused _get_cpu_power(unsigned long *mW, unsigned long *kHz, /** * dev_pm_opp_of_register_em() - Attempt to register an Energy Model - * @cpus : CPUs for which an Energy Model has to be registered + * @dev : Device for which an Energy Model has to be registered + * @cpus : CPUs for which an Energy Model has to be registered. For + * other type of devices it should be set to NULL. * * This checks whether the "dynamic-power-coefficient" devicetree property has * been specified, and tries to register an Energy Model with it if it has. + * Having this property means the voltages are known for OPPs and the EM + * might be calculated. */ -void dev_pm_opp_of_register_em(struct cpumask *cpus) +int dev_pm_opp_of_register_em(struct device *dev, struct cpumask *cpus) { - struct em_data_callback em_cb = EM_DATA_CB(_get_cpu_power); - int ret, nr_opp, cpu = cpumask_first(cpus); - struct device *cpu_dev; + struct em_data_callback em_cb = EM_DATA_CB(_get_power); struct device_node *np; + int ret, nr_opp; u32 cap; - cpu_dev = get_cpu_device(cpu); - if (!cpu_dev) - return; + if (IS_ERR_OR_NULL(dev)) { + ret = -EINVAL; + goto failed; + } - nr_opp = dev_pm_opp_get_opp_count(cpu_dev); - if (nr_opp <= 0) - return; + nr_opp = dev_pm_opp_get_opp_count(dev); + if (nr_opp <= 0) { + ret = -EINVAL; + goto failed; + } - np = of_node_get(cpu_dev->of_node); - if (!np) - return; + np = of_node_get(dev->of_node); + if (!np) { + ret = -EINVAL; + goto failed; + } /* * Register an EM only if the 'dynamic-power-coefficient' property is @@ -1289,9 +1297,20 @@ void dev_pm_opp_of_register_em(struct cpumask *cpus) */ ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap); of_node_put(np); - if (ret || !cap) - return; + if (ret || !cap) { + dev_dbg(dev, "Couldn't find proper 'dynamic-power-coefficient' in DT\n"); + ret = -EINVAL; + goto failed; + } - em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb, cpus); + ret = em_dev_register_perf_domain(dev, nr_opp, &em_cb, cpus); + if (ret) + goto failed; + + return 0; + +failed: + dev_dbg(dev, "Couldn't register Energy Model %d\n", ret); + return ret; } EXPORT_SYMBOL_GPL(dev_pm_opp_of_register_em); |