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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: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
[mpe: Drop NULL check before kfree(policy->driver_data)]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Shilpasri G Bhat 2018-04-25 11:44:55 +05:30 committed by Michael Ellerman
parent 26064848ef
commit dcb14337e0
1 changed files with 16 additions and 4 deletions
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20
drivers/cpufreq/powernv-cpufreq.c
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@ -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 @@ gpstates_done:
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;
}
@ -998,7 +1009,8 @@ 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);
del_timer_sync(&gpstates->timer);
if (gpstates)
del_timer_sync(&gpstates->timer);
}
static unsigned int powernv_fast_switch(struct cpufreq_policy *policy,