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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq 

Pull cpufreq fixes from Dave Jones:
 "I meant to get some of these in for 3.3 final, but left things too
  late, so I've got two trees this time."

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq:
  cpufreq: OMAP: specify range for voltage scaling
  cpufreq: OMAP: scale voltage along with frequency
  cpufreq: OMAP driver depends CPUfreq tables
This commit is contained in:
Linus Torvalds 2012-03-23 17:51:50 -07:00
parent 24613ff927 6139b652c8
commit 4416b0eaa3
3 changed files with 73 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/cpufreq/Kconfig.arm
View File

@ -2,6 +2,11 @@
# ARM CPU Frequency scaling drivers
#
config ARM_OMAP2PLUS_CPUFREQ
bool "TI OMAP2+"
default ARCH_OMAP2PLUS
select CPU_FREQ_TABLE
config ARM_S3C64XX_CPUFREQ
bool "Samsung S3C64XX"
depends on CPU_S3C6410

2
drivers/cpufreq/Makefile
View File

@ -44,7 +44,7 @@ obj-$(CONFIG_ARM_S3C64XX_CPUFREQ) += s3c64xx-cpufreq.o
obj-$(CONFIG_ARM_S5PV210_CPUFREQ) += s5pv210-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS_CPUFREQ) += exynos-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS4210_CPUFREQ) += exynos4210-cpufreq.o
obj-$(CONFIG_ARCH_OMAP2PLUS) += omap-cpufreq.o
obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ) += omap-cpufreq.o
##################################################################################
# PowerPC platform drivers

72
drivers/cpufreq/omap-cpufreq.c
View File

@ -25,6 +25,7 @@
#include <linux/opp.h>
#include <linux/cpu.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <asm/system.h>
#include <asm/smp_plat.h>
@ -37,6 +38,9 @@
#include <mach/hardware.h>
/* OPP tolerance in percentage */
#define OPP_TOLERANCE 4
#ifdef CONFIG_SMP
struct lpj_info {
unsigned long ref;
@ -52,6 +56,7 @@ static atomic_t freq_table_users = ATOMIC_INIT(0);
static struct clk *mpu_clk;
static char *mpu_clk_name;
static struct device *mpu_dev;
static struct regulator *mpu_reg;
static int omap_verify_speed(struct cpufreq_policy *policy)
{
@ -76,8 +81,10 @@ static int omap_target(struct cpufreq_policy *policy,
unsigned int relation)
{
unsigned int i;
int ret = 0;
int r, ret = 0;
struct cpufreq_freqs freqs;
struct opp *opp;
unsigned long freq, volt = 0, volt_old = 0, tol = 0;
if (!freq_table) {
dev_err(mpu_dev, "%s: cpu%d: no freq table!\n", __func__,
@ -111,13 +118,50 @@ static int omap_target(struct cpufreq_policy *policy,
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
}
#ifdef CONFIG_CPU_FREQ_DEBUG
pr_info("cpufreq-omap: transition: %u --> %u\n", freqs.old, freqs.new);
#endif
freq = freqs.new * 1000;
if (mpu_reg) {
opp = opp_find_freq_ceil(mpu_dev, &freq);
if (IS_ERR(opp)) {
dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n",
__func__, freqs.new);
return -EINVAL;
}
volt = opp_get_voltage(opp);
tol = volt * OPP_TOLERANCE / 100;
volt_old = regulator_get_voltage(mpu_reg);
}
dev_dbg(mpu_dev, "cpufreq-omap: %u MHz, %ld mV --> %u MHz, %ld mV\n",
freqs.old / 1000, volt_old ? volt_old / 1000 : -1,
freqs.new / 1000, volt ? volt / 1000 : -1);
/* scaling up? scale voltage before frequency */
if (mpu_reg && (freqs.new > freqs.old)) {
r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
if (r < 0) {
dev_warn(mpu_dev, "%s: unable to scale voltage up.\n",
__func__);
freqs.new = freqs.old;
goto done;
}
}
ret = clk_set_rate(mpu_clk, freqs.new * 1000);
freqs.new = omap_getspeed(policy->cpu);
/* scaling down? scale voltage after frequency */
if (mpu_reg && (freqs.new < freqs.old)) {
r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
if (r < 0) {
dev_warn(mpu_dev, "%s: unable to scale voltage down.\n",
__func__);
ret = clk_set_rate(mpu_clk, freqs.old * 1000);
freqs.new = freqs.old;
goto done;
}
}
freqs.new = omap_getspeed(policy->cpu);
#ifdef CONFIG_SMP
/*
* Note that loops_per_jiffy is not updated on SMP systems in
@ -144,6 +188,7 @@ static int omap_target(struct cpufreq_policy *policy,
freqs.new);
#endif
done:
/* notifiers */
for_each_cpu(i, policy->cpus) {
freqs.cpu = i;
@ -260,6 +305,23 @@ static int __init omap_cpufreq_init(void)
return -EINVAL;
}
mpu_reg = regulator_get(mpu_dev, "vcc");
if (IS_ERR(mpu_reg)) {
pr_warning("%s: unable to get MPU regulator\n", __func__);
mpu_reg = NULL;
} else {
/*
* Ensure physical regulator is present.
* (e.g. could be dummy regulator.)
*/
if (regulator_get_voltage(mpu_reg) < 0) {
pr_warn("%s: physical regulator not present for MPU\n",
__func__);
regulator_put(mpu_reg);
mpu_reg = NULL;
}
}
return cpufreq_register_driver(&omap_driver);
}