Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit a95247f5 authored by Maulik Shah's avatar Maulik Shah
Browse files

drivers: cpuidle: Minimize round off errors in wake up time 



Current implementation adds more delay in wake up time programmed
due to round off errors. Minimize round off errors in calculation.

Change-Id: Iddb19c6dae79c999de9fae444f0c64aac0500f42
Signed-off-by: default avatarMaulik Shah <mkshah@codeaurora.org>
parent fec225ae

drivers/cpuidle/lpm-levels.c

+13 −2
Original line number Diff line number Diff line
@@ -1123,6 +1123,8 @@ static int cluster_configure(struct lpm_cluster *cluster, int idx, 
		struct cpumask nextcpu, *cpumask;

		uint64_t us;

		uint32_t pred_us;

		uint64_t sec;

		uint64_t nsec;



		us = get_cluster_sleep_time(cluster, &nextcpu,

						from_idle, &pred_us);
@@ -1134,11 +1136,20 @@ static int cluster_configure(struct lpm_cluster *cluster, int idx, 
			goto failed_set_mode;

		}



		us = (us + 1) * 1000;

		clear_predict_history();

		clear_cl_predict_history();



		do_div(us, NSEC_PER_SEC/SCLK_HZ);

		us = us + 1;

		sec = us;

		do_div(sec, USEC_PER_SEC);

		nsec = us - sec * USEC_PER_SEC;



		sec = sec * SCLK_HZ;

		if (nsec > 0) {

			nsec = nsec * NSEC_PER_USEC;

			do_div(nsec, NSEC_PER_SEC/SCLK_HZ);

		}

		us = sec + nsec;

		msm_mpm_enter_sleep(us, from_idle, cpumask);

	}