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authorPreeti U Murthy <preeti@linux.vnet.ibm.com>2015-02-18 23:24:53 -0600
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-02-19 23:44:38 +0100
commit70734a786acfd1998e47d40df19cba5c29469bdf (patch)
tree4acd643d611cfe6aa65f92ab865780159a7f50af /drivers
parent92c83ff5b42b109c94fdeee53cb31f674f776d75 (diff)
cpuidle: powernv: Avoid endianness conversions while parsing DT
We currently read the information about idle states from the DT so as to populate the cpuidle table. Use those APIs to read from the DT that can avoid endianness conversions of the property values in the cpuidle driver. Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/cpuidle/cpuidle-powernv.c29
1 files changed, 16 insertions, 13 deletions
diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
index 30d42298a69f..59372077ec7c 100644
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -159,9 +159,7 @@ static int powernv_add_idle_states(void)
struct device_node *power_mgt;
int nr_idle_states = 1; /* Snooze */
int dt_idle_states;
- const __be32 *idle_state_flags;
- u32 len_flags, flags;
- u32 *latency_ns, *residency_ns;
+ u32 *latency_ns, *residency_ns, *flags;
int i, rc;
/* Currently we have snooze statically defined */
@@ -172,14 +170,19 @@ static int powernv_add_idle_states(void)
goto out;
}
- idle_state_flags = of_get_property(power_mgt,
- "ibm,cpu-idle-state-flags", &len_flags);
- if (!idle_state_flags) {
- pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-flags in DT\n");
+ /* Read values of any property to determine the num of idle states */
+ dt_idle_states = of_property_count_u32_elems(power_mgt, "ibm,cpu-idle-state-flags");
+ if (dt_idle_states < 0) {
+ pr_warn("cpuidle-powernv: no idle states found in the DT\n");
goto out;
}
- dt_idle_states = len_flags / sizeof(u32);
+ flags = kzalloc(sizeof(*flags) * dt_idle_states, GFP_KERNEL);
+ if (of_property_read_u32_array(power_mgt,
+ "ibm,cpu-idle-state-flags", flags, dt_idle_states)) {
+ pr_warn("cpuidle-powernv : missing ibm,cpu-idle-state-flags in DT\n");
+ goto out_free_flags;
+ }
latency_ns = kzalloc(sizeof(*latency_ns) * dt_idle_states, GFP_KERNEL);
rc = of_property_read_u32_array(power_mgt,
@@ -195,21 +198,19 @@ static int powernv_add_idle_states(void)
for (i = 0; i < dt_idle_states; i++) {
- flags = be32_to_cpu(idle_state_flags[i]);
-
/*
* Cpuidle accepts exit_latency and target_residency in us.
* Use default target_residency values if f/w does not expose it.
*/
- if (flags & OPAL_PM_NAP_ENABLED) {
+ if (flags[i] & OPAL_PM_NAP_ENABLED) {
/* Add NAP state */
strcpy(powernv_states[nr_idle_states].name, "Nap");
strcpy(powernv_states[nr_idle_states].desc, "Nap");
powernv_states[nr_idle_states].flags = 0;
powernv_states[nr_idle_states].target_residency = 100;
powernv_states[nr_idle_states].enter = &nap_loop;
- } else if (flags & OPAL_PM_SLEEP_ENABLED ||
- flags & OPAL_PM_SLEEP_ENABLED_ER1) {
+ } else if (flags[i] & OPAL_PM_SLEEP_ENABLED ||
+ flags[i] & OPAL_PM_SLEEP_ENABLED_ER1) {
/* Add FASTSLEEP state */
strcpy(powernv_states[nr_idle_states].name, "FastSleep");
strcpy(powernv_states[nr_idle_states].desc, "FastSleep");
@@ -232,6 +233,8 @@ static int powernv_add_idle_states(void)
kfree(residency_ns);
out_free_latency:
kfree(latency_ns);
+out_free_flags:
+ kfree(flags);
out:
return nr_idle_states;
}

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