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    Subject[PATCH] ACPI: Read TSC upon resume
    Date
    Read the TSC upon resuming and print it out. This is useful
    in helping figure out amount of time spent in the BIOS when
    resuming from suspend.

    Change-Id: I1d6a32bd62421becddecd152d561763e5f3e1101
    Signed-off-by: Sameer Nanda <snanda@chromium.org>
    ---
    drivers/acpi/sleep.c | 4 ++++
    1 files changed, 4 insertions(+), 0 deletions(-)

    diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
    index c0fed2e..f0588fa 100644
    --- a/drivers/acpi/sleep.c
    +++ b/drivers/acpi/sleep.c
    @@ -214,6 +214,7 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
    acpi_status status = AE_OK;
    unsigned long flags = 0;
    u32 acpi_state = acpi_target_sleep_state;
    + u64 tsc;

    ACPI_FLUSH_CPU_CACHE();

    @@ -235,6 +236,9 @@ static int acpi_suspend_enter(suspend_state_t pm_state)

    case ACPI_STATE_S3:
    do_suspend_lowlevel();
    + rdtscll(tsc);
    + printk(KERN_INFO "TSC at resume: %llu\n",
    + (unsigned long long)tsc);
    break;
    }

    --
    1.7.1


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