From: rjying <rjying@gmail.com>
To: "Rafael J. Wysocki" <rjw@sisk.pl>,
Viresh Kumar <viresh.kumar@linaro.org>,
cpufreq@vger.kernel.org, linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, rongjun.ying@gcsr.com,
Rongjun Ying <rongjun.ying@csr.com>
Subject: [PATCH 1/1] cpufreq: cpufreq-cpu0: use the max voltage instead of voltage-tolerance
Date: Tue, 5 Nov 2013 11:10:14 +0800 [thread overview]
Message-ID: <1383621014-11202-1-git-send-email-rongjun.ying@csr.com> (raw)
From: Rongjun Ying <rongjun.ying@csr.com>
Sometime the regulator can't supply appropriate voltages for requestion of cpu.
All voltage tolerance value can't figure out a good voltage.
Signed-off-by: Rongjun Ying <rongjun.ying@csr.com>
---
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
next reply other threads:[~2013-11-05 3:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-05 3:10 rjying [this message]
2013-11-05 4:38 ` [PATCH 1/1] cpufreq: cpufreq-cpu0: use the max voltage instead of voltage-tolerance Viresh Kumar
2013-11-05 11:53 ` Shawn Guo
2013-11-06 2:15 ` Rongjun Ying
2013-11-06 3:27 ` Shawn Guo
2013-11-07 1:55 ` Rongjun Ying
2013-11-07 2:26 ` Shawn Guo
2013-11-07 3:32 ` Rongjun Ying
2013-11-07 4:55 ` Shawn Guo
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