On Tue, Nov 05, 2013 at 10:08:06AM +0530, Viresh Kumar wrote:
> Adding shawn in cc list..
>
> On 5 November 2013 08:40, rjying <rjying@xxxxxxxxx> wrote:
> > From: Rongjun Ying <rongjun.ying@xxxxxxx>
> >
> > Sometime the regulator can't supply appropriate voltages for requestion of cpu.
> > All voltage tolerance value can't figure out a good voltage.
The voltage-tolerance is an optional device tree property. You can omit
it if you do not have a value for it.
Shawn
> >
> > Signed-off-by: Rongjun Ying <rongjun.ying@xxxxxxx>
> > ---
> > drivers/cpufreq/cpufreq-cpu0.c | 17 ++++++++++-------
> > 1 files changed, 10 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c
> > index c522a95..0c9e6b9 100644
> > --- a/drivers/cpufreq/cpufreq-cpu0.c
> > +++ b/drivers/cpufreq/cpufreq-cpu0.c
> > @@ -23,7 +23,7 @@
> > #include <linux/slab.h>
> >
> > static unsigned int transition_latency;
> > -static unsigned int voltage_tolerance; /* in percentage */
> > +static unsigned int voltage_max;
> >
> > static struct device *cpu_dev;
> > static struct clk *cpu_clk;
> > @@ -45,7 +45,7 @@ static int cpu0_set_target(struct cpufreq_policy *policy,
> > {
> > struct cpufreq_freqs freqs;
> > struct opp *opp;
> > - unsigned long volt = 0, volt_old = 0, tol = 0;
> > + unsigned long volt = 0, volt_old = 0;
> > long freq_Hz, freq_exact;
> > unsigned int index;
> > int ret;
> > @@ -82,7 +82,6 @@ static int cpu0_set_target(struct cpufreq_policy *policy,
> > }
> > volt = opp_get_voltage(opp);
> > rcu_read_unlock();
> > - tol = volt * voltage_tolerance / 100;
> > volt_old = regulator_get_voltage(cpu_reg);
> > }
> >
> > @@ -92,7 +91,7 @@ static int cpu0_set_target(struct cpufreq_policy *policy,
> >
> > /* scaling up? scale voltage before frequency */
> > if (!IS_ERR(cpu_reg) && freqs.new > freqs.old) {
> > - ret = regulator_set_voltage_tol(cpu_reg, volt, tol);
> > + ret = regulator_set_voltage(cpu_reg, volt, voltage_max);
> > if (ret) {
> > pr_err("failed to scale voltage up: %d\n", ret);
> > freqs.new = freqs.old;
> > @@ -104,14 +103,14 @@ static int cpu0_set_target(struct cpufreq_policy *policy,
> > if (ret) {
> > pr_err("failed to set clock rate: %d\n", ret);
> > if (!IS_ERR(cpu_reg))
> > - regulator_set_voltage_tol(cpu_reg, volt_old, tol);
> > + regulator_set_voltage(cpu_reg, volt_old, voltage_max);
> > freqs.new = freqs.old;
> > goto post_notify;
> > }
> >
> > /* scaling down? scale voltage after frequency */
> > if (!IS_ERR(cpu_reg) && freqs.new < freqs.old) {
> > - ret = regulator_set_voltage_tol(cpu_reg, volt, tol);
> > + ret = regulator_set_voltage(cpu_reg, volt, voltage_max);
> > if (ret) {
> > pr_err("failed to scale voltage down: %d\n", ret);
> > clk_set_rate(cpu_clk, freqs.old * 1000);
> > @@ -224,7 +223,11 @@ static int cpu0_cpufreq_probe(struct platform_device *pdev)
> > goto out_put_node;
> > }
> >
> > - of_property_read_u32(np, "voltage-tolerance", &voltage_tolerance);
> > + ret = of_property_read_u32(np, "voltage-max", &voltage_max);
> > + if (ret) {
> > + pr_err("failed to get max voltage: %d\n", ret);
> > + goto out_put_node;
> > + }
> >
> > if (of_property_read_u32(np, "clock-latency", &transition_latency))
> > transition_latency = CPUFREQ_ETERNAL;
> > --
> > 1.7.5.4
> >
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