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Commit dcb14337 authored by Shilpasri G Bhat's avatar Shilpasri G Bhat Committed by Michael Ellerman
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cpufreq: powernv: Remove global pstate ramp-down timer in POWER9 



POWER9 does not support global pstate requests for the chip. So remove
the timer logic which slowly ramps down the global pstate in P9
platforms.

Signed-off-by: default avatarShilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
[mpe: Drop NULL check before kfree(policy->driver_data)]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 26064848

drivers/cpufreq/powernv-cpufreq.c

+16 −4
Original line number Diff line number Diff line
@@ -758,8 +758,13 @@ static int powernv_cpufreq_target_index(struct cpufreq_policy *policy, 


	cur_msec = jiffies_to_msecs(get_jiffies_64());



	spin_lock(&gpstates->gpstate_lock);

	freq_data.pstate_id = idx_to_pstate(new_index);

	if (!gpstates) {

		freq_data.gpstate_id = freq_data.pstate_id;

		goto no_gpstate;

	}



	spin_lock(&gpstates->gpstate_lock);



	if (!gpstates->last_sampled_time) {

		gpstate_idx = new_index;
@@ -809,6 +814,7 @@ static int powernv_cpufreq_target_index(struct cpufreq_policy *policy, 


	spin_unlock(&gpstates->gpstate_lock);



no_gpstate:

	/*

	 * Use smp_call_function to send IPI and execute the

	 * mtspr on target CPU.  We could do that without IPI
@@ -843,6 +849,13 @@ static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy) 
		kernfs_put(kn);

	}



	policy->freq_table = powernv_freqs;

	policy->fast_switch_possible = true;



	if (pvr_version_is(PVR_POWER9))

		return 0;



	/* Initialise Gpstate ramp-down timer only on POWER8 */

	gpstates =  kzalloc(sizeof(*gpstates), GFP_KERNEL);

	if (!gpstates)

		return -ENOMEM;
@@ -857,8 +870,6 @@ static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy) 
				msecs_to_jiffies(GPSTATE_TIMER_INTERVAL);

	spin_lock_init(&gpstates->gpstate_lock);



	policy->freq_table = powernv_freqs;

	policy->fast_switch_possible = true;

	return 0;

}
@@ -998,6 +1009,7 @@ static void powernv_cpufreq_stop_cpu(struct cpufreq_policy *policy) 
	freq_data.pstate_id = idx_to_pstate(powernv_pstate_info.min);

	freq_data.gpstate_id = idx_to_pstate(powernv_pstate_info.min);

	smp_call_function_single(policy->cpu, set_pstate, &freq_data, 1);

	if (gpstates)

		del_timer_sync(&gpstates->timer);

}