diff options
| author | Sonic Zhang <sonic.zhang@analog.com> | 2012-05-17 17:33:00 +0800 |
|---|---|---|
| committer | Bob Liu <lliubbo@gmail.com> | 2012-05-21 14:54:52 +0800 |
| commit | 72b099ed93989575b0c447023748968d30059e8f (patch) | |
| tree | 0e5bb7040da26232d66c2fb6c24854566ed9a07a /arch/blackfin/mach-common/pm.c | |
| parent | 0fbd88ca20a68a633b565e1f5ba18ca64afb0c78 (diff) | |
| download | linux-72b099ed93989575b0c447023748968d30059e8f.tar.bz2 | |
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>
Diffstat (limited to 'arch/blackfin/mach-common/pm.c')
| -rw-r--r-- | arch/blackfin/mach-common/pm.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/blackfin/mach-common/pm.c b/arch/blackfin/mach-common/pm.c index 610a3cdf3998..ca6655e0d653 100644 --- a/arch/blackfin/mach-common/pm.c +++ b/arch/blackfin/mach-common/pm.c @@ -247,9 +247,39 @@ static int bfin_pm_enter(suspend_state_t state) 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) |