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powerpc/powernv: Avoid explicit endian conversions while parsing device tree 

We currently read the information about idle states from the device
tree, so as to find out the CPU idle states supported by the platform.

Use the of_property_read/count_xxx() APIs, which handle endian
conversions for us, and mean we don't need any endian annotations in the
code.

Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Preeti U Murthy 2015-02-03 12:13:44 +05:30 committed by Michael Ellerman
parent 1318470d78
commit 605f302053
1 changed files with 20 additions and 15 deletions
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35
arch/powerpc/platforms/powernv/setup.c
View File

@ -409,37 +409,39 @@ static int __init pnv_init_idle_states(void)
{
struct device_node *power_mgt;
int dt_idle_states;
const __be32 *idle_state_flags;
u32 len_flags, flags;
u32 *flags;
int i;
supported_cpuidle_states = 0;
if (cpuidle_disable != IDLE_NO_OVERRIDE)
return 0;
goto out;
if (!firmware_has_feature(FW_FEATURE_OPALv3))
return 0;
goto out;
power_mgt = of_find_node_by_path("/ibm,opal/power-mgt");
if (!power_mgt) {
pr_warn("opal: PowerMgmt Node not found\n");
return 0;
goto out;
}
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;
}
idle_state_flags = of_get_property(power_mgt,
"ibm,cpu-idle-state-flags", &len_flags);
if (!idle_state_flags) {
pr_warn("DT-PowerMgmt: missing ibm,cpu-idle-state-flags\n");
return 0;
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;
}
dt_idle_states = len_flags / sizeof(u32);
for (i = 0; i < dt_idle_states; i++)
supported_cpuidle_states |= flags[i];
for (i = 0; i < dt_idle_states; i++) {
flags = be32_to_cpu(idle_state_flags[i]);
supported_cpuidle_states |= flags;
}
if (!(supported_cpuidle_states & OPAL_PM_SLEEP_ENABLED_ER1)) {
patch_instruction(
(unsigned int *)pnv_fastsleep_workaround_at_entry,
@ -449,6 +451,9 @@ static int __init pnv_init_idle_states(void)
PPC_INST_NOP);
}
pnv_alloc_idle_core_states();
out_free:
kfree(flags);
out:
return 0;
}