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Date: Wed, 12 Feb 2014 10:01:05 -0800 From: dirk.brandewie@...il.com To: linux-pm@...r.kernel.org, rjw@...ysocki.net Cc: linux-kernel@...r.kernel.org, Dirk Brandewie <dirk.j.brandewie@...el.com> Subject: [PATCH 3/5] intel_pstate: fix pid_reset to use fixed point values From: Dirk Brandewie <dirk.j.brandewie@...el.com> commit d253d2a526 Improve accuracy by not truncating until final result, changed internal variables of the PID to be fixed point numbers. Update the pid_reset() to reflect this change. Signed-off-by: Dirk Brandewie <dirk.j.brandewie@...el.com> --- drivers/cpufreq/intel_pstate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index d692b10..b80c03d 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -150,7 +150,7 @@ static inline void pid_reset(struct _pid *pid, int setpoint, int busy, pid->setpoint = setpoint; pid->deadband = deadband; pid->integral = int_tofp(integral); - pid->last_err = setpoint - busy; + pid->last_err = int_tofp(setpoint) - int_tofp(busy); } static inline void pid_p_gain_set(struct _pid *pid, int percent) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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