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cpufreq: intel_pstate: Clean up intel_pstate_busy_pid_reset() 

intel_pstate_busy_pid_reset() is the only caller of pid_reset(),
pid_p_gain_set(), pid_i_gain_set(), and pid_d_gain_set().  Moreover,
it passes constants as two parameters of pid_reset() and all of
the other routines above essentially contain the same code, so
fold all of them into the caller and drop unnecessary computations.

Introduce percent_fp() for converting integer values in percent
to fixed-point fractions and use it in the above code cleanup.

Finally, rename intel_pstate_busy_pid_reset() to
intel_pstate_pid_reset() as it also is used for the
initialization of PID parameters for every CPU and the
meaning of the "busy" part of the name is not particularly
clear.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2017-03-28 00:09:18 +02:00
parent 4ddd0146c7
commit ff35f02ea1
1 changed files with 16 additions and 30 deletions
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46
drivers/cpufreq/intel_pstate.c
View File

@ -74,6 +74,11 @@ static inline int ceiling_fp(int32_t x)
return ret; return ret;
} }
static inline int32_t percent_fp(int percent)
{
return div_fp(percent, 100);
}
static inline u64 mul_ext_fp(u64 x, u64 y) static inline u64 mul_ext_fp(u64 x, u64 y)
{ {
return (x * y) >> EXT_FRAC_BITS; return (x * y) >> EXT_FRAC_BITS;
@ -507,29 +512,6 @@ static inline void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
} }
#endif #endif
static inline void pid_reset(struct _pid *pid, int setpoint, int busy,
int deadband, int integral) {
pid->setpoint = int_tofp(setpoint);
pid->deadband = int_tofp(deadband);
pid->integral = int_tofp(integral);
pid->last_err = int_tofp(setpoint) - int_tofp(busy);
}
static inline void pid_p_gain_set(struct _pid *pid, int percent)
{
pid->p_gain = div_fp(percent, 100);
}
static inline void pid_i_gain_set(struct _pid *pid, int percent)
{
pid->i_gain = div_fp(percent, 100);
}
static inline void pid_d_gain_set(struct _pid *pid, int percent)
{
pid->d_gain = div_fp(percent, 100);
}
static signed int pid_calc(struct _pid *pid, int32_t busy) static signed int pid_calc(struct _pid *pid, int32_t busy)
{ {
signed int result; signed int result;
@ -567,13 +549,17 @@ static signed int pid_calc(struct _pid *pid, int32_t busy)
return (signed int)fp_toint(result); return (signed int)fp_toint(result);
} }
static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu) static inline void intel_pstate_pid_reset(struct cpudata *cpu)
{ {
pid_p_gain_set(&cpu->pid, pid_params.p_gain_pct); struct _pid *pid = &cpu->pid;
pid_d_gain_set(&cpu->pid, pid_params.d_gain_pct);
pid_i_gain_set(&cpu->pid, pid_params.i_gain_pct);
pid_reset(&cpu->pid, pid_params.setpoint, 100, pid_params.deadband, 0); pid->p_gain = percent_fp(pid_params.p_gain_pct);
pid->d_gain = percent_fp(pid_params.d_gain_pct);
pid->i_gain = percent_fp(pid_params.i_gain_pct);
pid->setpoint = int_tofp(pid_params.setpoint);
pid->last_err = pid->setpoint - int_tofp(100);
pid->deadband = int_tofp(pid_params.deadband);
pid->integral = 0;
} }
static inline void update_turbo_state(void) static inline void update_turbo_state(void)
@ -937,7 +923,7 @@ static int pid_param_set(void *data, u64 val)
pid_params.sample_rate_ns = pid_params.sample_rate_ms * NSEC_PER_MSEC; pid_params.sample_rate_ns = pid_params.sample_rate_ms * NSEC_PER_MSEC;
for_each_possible_cpu(cpu) for_each_possible_cpu(cpu)
if (all_cpu_data[cpu]) if (all_cpu_data[cpu])
intel_pstate_busy_pid_reset(all_cpu_data[cpu]); intel_pstate_pid_reset(all_cpu_data[cpu]);
return 0; return 0;
} }
@ -1931,7 +1917,7 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
intel_pstate_get_cpu_pstates(cpu); intel_pstate_get_cpu_pstates(cpu);
intel_pstate_busy_pid_reset(cpu); intel_pstate_pid_reset(cpu);
pr_debug("controlling: cpu %d\n", cpunum); pr_debug("controlling: cpu %d\n", cpunum);