ARM: tegra: cpuidle: Keep statistics on idle wake interrupts

Change-Id: Ieaee455b4e52f232c5b1285756c22bcdc7fdc6b4
Signed-off-by: Colin Cross <ccross@android.com>

diff --git a/arch/arm/mach-tegra/cpuidle.c b/arch/arm/mach-tegra/cpuidle.c
index fc1d2ab2cdda3a9548d7208b5ab43da71fd0fa3a..765e368401aa158b5e4d56352e6635c9054a23d5 100644 (file)
--- a/arch/arm/mach-tegra/cpuidle.c
+++ b/arch/arm/mach-tegra/cpuidle.c
@@ -78,6 +78,8 @@ static struct {
        unsigned int lp2_completed_count;
        unsigned int lp2_count_bin[32];
        unsigned int lp2_completed_count_bin[32];
+       unsigned int lp2_int_count[NR_IRQS];
+       unsigned int last_lp2_int_count[NR_IRQS];
 } idle_stats;
 
 struct cpuidle_driver tegra_idle = {
@@ -98,17 +100,7 @@ static DEFINE_PER_CPU(struct cpuidle_device *, idle_devices);
 
 static inline unsigned int time_to_bin(unsigned int time)
 {
-       unsigned int bin = 0;
-       int i;
-
-       for (i = 4; i >= 0; i--) {
-               if (time > (1 << (1 << i)) - 1) {
-                       time >>= (1 << i);
-                       bin += (1 << i);
-               }
-       }
-
-       return bin;
+       return fls(time);
 }
 
 static inline void tegra_unmask_irq(int irq)
@@ -308,6 +300,8 @@ restart:
 
                if (tegra_suspend_lp2(sleep_time) == 0)
                        sleep_completed = true;
+               else
+                       idle_stats.lp2_int_count[tegra_pending_interrupt()]++;
        }
 
        /* Bring CPU1 out of LP2 */
@@ -618,6 +612,7 @@ module_exit(tegra_cpuidle_exit);
 static int tegra_lp2_debug_show(struct seq_file *s, void *data)
 {
        int bin;
+       int i;
        seq_printf(s, "                                    cpu0     cpu1\n");
        seq_printf(s, "-------------------------------------------------\n");
        seq_printf(s, "cpu ready:                      %8u %8u\n",
@@ -665,6 +660,21 @@ static int tegra_lp2_debug_show(struct seq_file *s, void *data)
                                idle_stats.lp2_count_bin[bin]);
        }
 
+       seq_printf(s, "\n");
+       seq_printf(s, "%3s %20s %6s %10s\n",
+               "int", "name", "count", "last count");
+       seq_printf(s, "--------------------------------------------\n");
+       for (i = 0; i < NR_IRQS; i++) {
+               if (idle_stats.lp2_int_count[i] == 0)
+                       continue;
+               seq_printf(s, "%3d %20s %6d %10d\n",
+                       i, irq_to_desc(i)->action ?
+                               irq_to_desc(i)->action->name ?: "???" : "???",
+                       idle_stats.lp2_int_count[i],
+                       idle_stats.lp2_int_count[i] -
+                               idle_stats.last_lp2_int_count[i]);
+               idle_stats.last_lp2_int_count[i] = idle_stats.lp2_int_count[i];
+       };
        return 0;
 }