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Commit 0c86f63b authored by Ram Chandrasekar's avatar Ram Chandrasekar
Browse files

msm: thermal: update LMH DCVSh even when cores are offline 



KTM right now won't update the mitigation frequency cap to LMH DCVSh if
all the cores in a cluster are offline. It will notify the LMH DCVSh
when at least one core is online. Due to race condition, there is a
possibility that this update can be missed or cores will be running
unmitigated for a short duration after being online.

LMH DCVSh hardware can accept the frequency cap even when the cores are
offline and apply the cap later when the cores are brought back online.
So in KTM update the LMH DCVSh hardware, even if the cores are offline
to avoid any race condition.

Change-Id: Idc04c35a9c5de66cfd8edb4150106ed65f9f4bf1
Signed-off-by: default avatarRam Chandrasekar <rkumbako@codeaurora.org>
parent 2aa89ab3

drivers/thermal/msm_thermal.c

+11 −6
Original line number Diff line number Diff line
@@ -1134,6 +1134,14 @@ static void update_cpu_freq(int cpu, enum freq_limits changed) 
		if (ret)

			pr_err("Unable to update policy for cpu:%d. err:%d\n",

				cpu, ret);

	} else if (lmh_dcvs_available) {

		trace_thermal_pre_frequency_mit(cpu,

			cpus[cpu].limited_max_freq,

			cpus[cpu].limited_min_freq);

		msm_lmh_dcvs_update(cpu);

		trace_thermal_post_frequency_mit(cpu,

			cpufreq_quick_get_max(cpu),

			cpus[cpu].limited_min_freq);

	}

}
@@ -1621,6 +1629,9 @@ static void update_cluster_freq(void) 
			changed |= FREQ_LIMIT_MIN;

		cluster_ptr->limited_max_freq = max;

		cluster_ptr->limited_min_freq = min;

		if (online_cpu == -1 && lmh_dcvs_available)

			online_cpu = cpumask_first(

					&cluster_ptr->cluster_cores);

		if (online_cpu != -1)

			update_cpu_freq(online_cpu, changed);

	}
@@ -3646,12 +3657,6 @@ static int __ref msm_thermal_cpu_callback(struct notifier_block *nfb, 


	switch (action & ~CPU_TASKS_FROZEN) {

	case CPU_UP_PREPARE:

		/*

		 * Apply LMH freq cap vote, which was requested when the

		 * core was offline.

		 */

		if (lmh_dcvs_available)

			msm_lmh_dcvs_update(cpu);

		if (!cpumask_test_and_set_cpu(cpu, cpus_previously_online))

			pr_debug("Total prev cores online tracked %u\n",

				cpumask_weight(cpus_previously_online));