blackfin: bf60x: pm: Add a debug option to calculate kernel wakeup time.
Display the total time when kernel resumes normal from standby or suspend to mem
mode.
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
diff --git a/arch/blackfin/mach-common/pm.c b/arch/blackfin/mach-common/pm.c
index 610a3cd..ca6655e 100644
--- a/arch/blackfin/mach-common/pm.c
+++ b/arch/blackfin/mach-common/pm.c
@@ -247,9 +247,39 @@
return 0;
}
+#ifdef CONFIG_BFIN_PM_WAKEUP_TIME_BENCH
+void bfin_pm_end(void)
+{
+ u32 cycle, cycle2;
+ u64 usec64;
+ u32 usec;
+
+ __asm__ __volatile__ (
+ "1: %0 = CYCLES2\n"
+ "%1 = CYCLES\n"
+ "%2 = CYCLES2\n"
+ "CC = %2 == %0\n"
+ "if ! CC jump 1b\n"
+ : "=d,a" (cycle2), "=d,a" (cycle), "=d,a" (usec) : : "CC"
+ );
+
+ usec64 = ((u64)cycle2 << 32) + cycle;
+ do_div(usec64, get_cclk() / USEC_PER_SEC);
+ usec = usec64;
+ if (usec == 0)
+ usec = 1;
+
+ pr_info("PM: resume of kernel completes after %ld msec %03ld usec\n",
+ usec / USEC_PER_MSEC, usec % USEC_PER_MSEC);
+}
+#endif
+
static const struct platform_suspend_ops bfin_pm_ops = {
.enter = bfin_pm_enter,
.valid = bfin_pm_valid,
+#ifdef CONFIG_BFIN_PM_WAKEUP_TIME_BENCH
+ .end = bfin_pm_end,
+#endif
};
static int __init bfin_pm_init(void)