From: Philippe Longepe Date: Tue, 8 Mar 2016 09:31:14 +0000 (+0100) Subject: intel_pstate: Remove extra conversions in pid calculation X-Git-Tag: v4.6-rc1~136^2~2^2~4 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b54a0dfd56d5c314302987e0ff173b3f1bfcb555;p=karo-tx-linux.git intel_pstate: Remove extra conversions in pid calculation pid->setpoint and pid->deadband can be initialized in fixed point, so we can avoid the int_tofp in pid_calc. Signed-off-by: Philippe Longepe Signed-off-by: Rafael J. Wysocki --- diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 23bb798d0cd2..864214de5cdf 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -198,8 +198,8 @@ static struct perf_limits *limits = &powersave_limits; static inline void pid_reset(struct _pid *pid, int setpoint, int busy, int deadband, int integral) { - pid->setpoint = setpoint; - pid->deadband = deadband; + pid->setpoint = int_tofp(setpoint); + pid->deadband = int_tofp(deadband); pid->integral = int_tofp(integral); pid->last_err = int_tofp(setpoint) - int_tofp(busy); } @@ -225,9 +225,9 @@ static signed int pid_calc(struct _pid *pid, int32_t busy) int32_t pterm, dterm, fp_error; int32_t integral_limit; - fp_error = int_tofp(pid->setpoint) - busy; + fp_error = pid->setpoint - busy; - if (abs(fp_error) <= int_tofp(pid->deadband)) + if (abs(fp_error) <= pid->deadband) return 0; pterm = mul_fp(pid->p_gain, fp_error);