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    Subject[34-longterm 209/260] ACPI: enable repeated PCIEXP wakeup by clearing PCIEXP_WAKE_STS on resume
    Date
    From: Colin Ian King <colin.king@canonical.com>

    commit 573b638158029898caf9470c8214b7ddd29751e3 upstream.

    Section 4.7.3.1.1 (PM1 Status Registers) of version 4.0 of
    the ACPI spec concerning PCIEXP_WAKE_STS points out in
    in the final note field in table 4-11 that if this bit is
    set to 1 and the system is put into a sleeping state then
    the system will not automatically wake.

    This bit gets set by hardware to indicate that the system
    woke up due to a PCI Express wakeup event, so clear it during
    acpi_hw_clear_acpi_status() calls to enable subsequent
    resumes to work.

    BugLink: http://bugs.launchpad.net/bugs/613381

    Signed-off-by: Colin Ian King <colin.king@canonical.com>
    Signed-off-by: Len Brown <len.brown@intel.com>
    Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
    ---
    drivers/acpi/acpica/aclocal.h | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h
    index 24b8faa..3a739ba 100644
    --- a/drivers/acpi/acpica/aclocal.h
    +++ b/drivers/acpi/acpica/aclocal.h
    @@ -848,6 +848,7 @@ struct acpi_bit_register_info {
    ACPI_BITMASK_POWER_BUTTON_STATUS | \
    ACPI_BITMASK_SLEEP_BUTTON_STATUS | \
    ACPI_BITMASK_RT_CLOCK_STATUS | \
    + ACPI_BITMASK_PCIEXP_WAKE_DISABLE | \
    ACPI_BITMASK_WAKE_STATUS)

    #define ACPI_BITMASK_TIMER_ENABLE 0x0001
    --
    1.7.3.3


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