diff options
Diffstat (limited to 'drivers/cpufreq/e_powersaver.c')
| -rw-r--r-- | drivers/cpufreq/e_powersaver.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/cpufreq/e_powersaver.c b/drivers/cpufreq/e_powersaver.c index 2882d40a3084..4bd6815d317b 100644 --- a/drivers/cpufreq/e_powersaver.c +++ b/drivers/cpufreq/e_powersaver.c @@ -43,6 +43,7 @@ static struct eps_cpu_data *eps_cpu[NR_CPUS]; /* Module parameters */ static int freq_failsafe_off; static int voltage_failsafe_off; +static int set_max_voltage; #if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE static int ignore_acpi_limit; @@ -340,6 +341,21 @@ static int eps_cpu_init(struct cpufreq_policy *policy) } #endif + /* Allow user to set lower maximum voltage then that reported + * by processor */ + if (brand == EPS_BRAND_C7M && set_max_voltage) { + u32 v; + + /* Change mV to something hardware can use */ + v = (set_max_voltage - 700) / 16; + /* Check if voltage is within limits */ + if (v >= min_voltage && v <= max_voltage) { + printk(KERN_INFO "eps: Setting %dmV as maximum.\n", + v * 16 + 700); + max_voltage = v; + } + } + /* Calc number of p-states supported */ if (brand == EPS_BRAND_C7M) states = max_multiplier - min_multiplier + 1; @@ -453,6 +469,8 @@ MODULE_PARM_DESC(voltage_failsafe_off, "Disable current vs max voltage check"); module_param(ignore_acpi_limit, int, 0644); MODULE_PARM_DESC(ignore_acpi_limit, "Don't check ACPI's processor speed limit"); #endif +module_param(set_max_voltage, int, 0644); +MODULE_PARM_DESC(set_max_voltage, "Set maximum CPU voltage (mV) C7-M only"); MODULE_AUTHOR("Rafal Bilski <rafalbilski@interia.pl>"); MODULE_DESCRIPTION("Enhanced PowerSaver driver for VIA C7 CPU's."); |