Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

cpufreq: powernv: Remove global pstate ramp-down timer in POWER9

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

20
drivers/cpufreq/powernv-cpufreq.c
View file

@ -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;
}
@ -998,7 +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,