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hwmon: (fam15h_power) Add ratio of Tsample to the PTSC period 

This patch adds a member (cpu_pwr_sample_ratio) of fam15h_power_data,
that represents the ratio of compute unit power accumulator sample
period to the PTSC counter period.

Tsample: compute unit power accumulator sample period
Tref: the performance timestamp counter period
PTSC: performance timestamp counter

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
hifive-unleashed-5.1
Huang Rui 2015-08-27 16:07:38 +08:00 committed by Guenter Roeck
parent 5aeb5d205e
commit 1ed32160db
1 changed files with 15 additions and 1 deletions
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16
drivers/hwmon/fam15h_power.c
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@ -46,6 +46,7 @@ struct fam15h_power_data {
unsigned int tdp_to_watts;
unsigned int base_tdp;
unsigned int processor_pwr_watts;
unsigned int cpu_pwr_sample_ratio;
};
static ssize_t show_power(struct device *dev,
@ -188,7 +189,7 @@ static int fam15h_power_resume(struct pci_dev *pdev)
static void fam15h_power_init_data(struct pci_dev *f4,
struct fam15h_power_data *data)
{
u32 val;
u32 val, eax, ebx, ecx, edx;
u64 tmp;
pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);
@ -209,6 +210,19 @@ static void fam15h_power_init_data(struct pci_dev *f4,
/* convert to microWatt */
data->processor_pwr_watts = (tmp * 15625) >> 10;
cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
/* CPUID Fn8000_0007:EDX[12] indicates to support accumulated power */
if (!(edx & BIT(12)))
return;
/*
* determine the ratio of the compute unit power accumulator
* sample period to the PTSC counter period by executing CPUID
* Fn8000_0007:ECX
*/
data->cpu_pwr_sample_ratio = ecx;
}
static int fam15h_power_probe(struct pci_dev *pdev,