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authorJoseph Lo <josephl@nvidia.com>2019-02-01 05:16:39 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-02-01 14:58:58 +0300
commitdb10945cf49e9c04053b436abe334412003f9af9 (patch)
tree24797e28e65efb606e6e3f0aa374f6377d85db7b /drivers/cpuidle
parent8a56bdeb09007e33107e6fdf72909e74c2fe1b95 (diff)
downloadlinux-db10945cf49e9c04053b436abe334412003f9af9.tar.xz
cpuidle: dt: bail out if the idle-state DT node is not compatible
Currently, the DT of the idle states will be parsed first whether it's compatible or not. This could cause a warning message that comes from if the CPU doesn't support identical idle states. E.g. Tegra186 can run with 2 Cortex-A57 and 2 Denver cores with different idle states on different types of these cores. So fix it by checking the match node earlier, then it can make sure it only goes through the idle states that the CPU supported. Signed-off-by: Joseph Lo <josephl@nvidia.com> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/dt_idle_states.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/cpuidle/dt_idle_states.c b/drivers/cpuidle/dt_idle_states.c
index 53342b7f1010..add9569636b5 100644
--- a/drivers/cpuidle/dt_idle_states.c
+++ b/drivers/cpuidle/dt_idle_states.c
@@ -22,16 +22,12 @@
#include "dt_idle_states.h"
static int init_state_node(struct cpuidle_state *idle_state,
- const struct of_device_id *matches,
+ const struct of_device_id *match_id,
struct device_node *state_node)
{
int err;
- const struct of_device_id *match_id;
const char *desc;
- match_id = of_match_node(matches, state_node);
- if (!match_id)
- return -ENODEV;
/*
* CPUidle drivers are expected to initialize the const void *data
* pointer of the passed in struct of_device_id array to the idle
@@ -160,6 +156,7 @@ int dt_init_idle_driver(struct cpuidle_driver *drv,
{
struct cpuidle_state *idle_state;
struct device_node *state_node, *cpu_node;
+ const struct of_device_id *match_id;
int i, err = 0;
const cpumask_t *cpumask;
unsigned int state_idx = start_idx;
@@ -180,6 +177,12 @@ int dt_init_idle_driver(struct cpuidle_driver *drv,
if (!state_node)
break;
+ match_id = of_match_node(matches, state_node);
+ if (!match_id) {
+ err = -ENODEV;
+ break;
+ }
+
if (!of_device_is_available(state_node)) {
of_node_put(state_node);
continue;
@@ -198,7 +201,7 @@ int dt_init_idle_driver(struct cpuidle_driver *drv,
}
idle_state = &drv->states[state_idx++];
- err = init_state_node(idle_state, matches, state_node);
+ err = init_state_node(idle_state, match_id, state_node);
if (err) {
pr_err("Parsing idle state node %pOF failed with err %d\n",
state_node, err);