mirror of
https://github.com/torvalds/linux.git
synced 2024-11-11 14:42:24 +00:00
d9975b0b07
Currently when performing random CPU hot-plugs and suspend-to-ram(S2R)
on systems using arm_big_little cpufreq driver, we get warnings similar
to something like below:
cpu cpu1: _opp_add: duplicate OPPs detected. Existing: freq: 600000000,
volt: 800000, enabled: 1. New: freq: 600000000, volt: 800000, enabled: 1
This is mainly because the OPPs for the shared cpus are not set. We can
just use dev_pm_opp_of_cpumask_add_table in case the OPPs are obtained
from DT(arm_big_little_dt.c) or use dev_pm_opp_set_sharing_cpus if the
OPPs are obtained by other means like firmware(e.g. scpi-cpufreq.c)
Also now that the generic dev_pm_opp{,_of}_cpumask_remove_table can
handle removal of opp table and entries for all associated CPUs, we can
re-use dev_pm_opp{,_of}_cpumask_remove_table as free_opp_table in
cpufreq_arm_bL_ops.
This patch makes necessary changes to reuse the generic OPP functions for
{init,free}_opp_table and thereby eliminating the warnings.
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/*
|
|
* Generic big.LITTLE CPUFreq Interface driver
|
|
*
|
|
* It provides necessary ops to arm_big_little cpufreq driver and gets
|
|
* Frequency information from Device Tree. Freq table in DT must be in KHz.
|
|
*
|
|
* Copyright (C) 2013 Linaro.
|
|
* 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.
|
|
*
|
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
|
* kind, whether express or implied; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/device.h>
|
|
#include <linux/export.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/pm_opp.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
#include "arm_big_little.h"
|
|
|
|
/* get cpu node with valid operating-points */
|
|
static struct device_node *get_cpu_node_with_valid_op(int cpu)
|
|
{
|
|
struct device_node *np = of_cpu_device_node_get(cpu);
|
|
|
|
if (!of_get_property(np, "operating-points", NULL)) {
|
|
of_node_put(np);
|
|
np = NULL;
|
|
}
|
|
|
|
return np;
|
|
}
|
|
|
|
static int dt_get_transition_latency(struct device *cpu_dev)
|
|
{
|
|
struct device_node *np;
|
|
u32 transition_latency = CPUFREQ_ETERNAL;
|
|
|
|
np = of_node_get(cpu_dev->of_node);
|
|
if (!np) {
|
|
pr_info("Failed to find cpu node. Use CPUFREQ_ETERNAL transition latency\n");
|
|
return CPUFREQ_ETERNAL;
|
|
}
|
|
|
|
of_property_read_u32(np, "clock-latency", &transition_latency);
|
|
of_node_put(np);
|
|
|
|
pr_debug("%s: clock-latency: %d\n", __func__, transition_latency);
|
|
return transition_latency;
|
|
}
|
|
|
|
static struct cpufreq_arm_bL_ops dt_bL_ops = {
|
|
.name = "dt-bl",
|
|
.get_transition_latency = dt_get_transition_latency,
|
|
.init_opp_table = dev_pm_opp_of_cpumask_add_table,
|
|
.free_opp_table = dev_pm_opp_of_cpumask_remove_table,
|
|
};
|
|
|
|
static int generic_bL_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np;
|
|
|
|
np = get_cpu_node_with_valid_op(0);
|
|
if (!np)
|
|
return -ENODEV;
|
|
|
|
of_node_put(np);
|
|
return bL_cpufreq_register(&dt_bL_ops);
|
|
}
|
|
|
|
static int generic_bL_remove(struct platform_device *pdev)
|
|
{
|
|
bL_cpufreq_unregister(&dt_bL_ops);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver generic_bL_platdrv = {
|
|
.driver = {
|
|
.name = "arm-bL-cpufreq-dt",
|
|
},
|
|
.probe = generic_bL_probe,
|
|
.remove = generic_bL_remove,
|
|
};
|
|
module_platform_driver(generic_bL_platdrv);
|
|
|
|
MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
|
|
MODULE_DESCRIPTION("Generic ARM big LITTLE cpufreq driver via DT");
|
|
MODULE_LICENSE("GPL v2");
|