Merge branch 'stable-3.18' of git://git.infradead.org/users/pcmoore/selinux into...

[cascardo/linux.git] / drivers / cpuidle / cpuidle-powernv.c

diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
index a64be57..7d3a349 100644 (file)
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -163,7 +163,8 @@ static int powernv_add_idle_states(void)
        int nr_idle_states = 1; /* Snooze */
        int dt_idle_states;
        const __be32 *idle_state_flags;
-       u32 len_flags, flags;
+       const __be32 *idle_state_latency;
+       u32 len_flags, flags, latency_ns;
        int i;
 
        /* Currently we have snooze statically defined */
@@ -180,18 +181,32 @@ static int powernv_add_idle_states(void)
                return nr_idle_states;
        }
 
+       idle_state_latency = of_get_property(power_mgt,
+                       "ibm,cpu-idle-state-latencies-ns", NULL);
+       if (!idle_state_latency) {
+               pr_warn("DT-PowerMgmt: missing ibm,cpu-idle-state-latencies-ns\n");
+               return nr_idle_states;
+       }
+
        dt_idle_states = len_flags / sizeof(u32);
 
        for (i = 0; i < dt_idle_states; i++) {
 
                flags = be32_to_cpu(idle_state_flags[i]);
+
+               /* Cpuidle accepts exit_latency in us and we estimate
+                * target residency to be 10x exit_latency
+                */
+               latency_ns = be32_to_cpu(idle_state_latency[i]);
                if (flags & IDLE_USE_INST_NAP) {
                        /* 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 = CPUIDLE_FLAG_TIME_VALID;
-                       powernv_states[nr_idle_states].exit_latency = 10;
-                       powernv_states[nr_idle_states].target_residency = 100;
+                       powernv_states[nr_idle_states].exit_latency =
+                                       ((unsigned int)latency_ns) / 1000;
+                       powernv_states[nr_idle_states].target_residency =
+                                       ((unsigned int)latency_ns / 100);
                        powernv_states[nr_idle_states].enter = &nap_loop;
                        nr_idle_states++;
                }
@@ -202,8 +217,10 @@ static int powernv_add_idle_states(void)
                        strcpy(powernv_states[nr_idle_states].desc, "FastSleep");
                        powernv_states[nr_idle_states].flags =
                                CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TIMER_STOP;
-                       powernv_states[nr_idle_states].exit_latency = 300;
-                       powernv_states[nr_idle_states].target_residency = 1000000;
+                       powernv_states[nr_idle_states].exit_latency =
+                                       ((unsigned int)latency_ns) / 1000;
+                       powernv_states[nr_idle_states].target_residency =
+                                       ((unsigned int)latency_ns / 100);
                        powernv_states[nr_idle_states].enter = &fastsleep_loop;
                        nr_idle_states++;
                }