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    Subject[PATCH AUTOSEL for 3.18 089/102] ACPICA: Events: Add runtime stub support for event APIs
    Date
    From: Lv Zheng <lv.zheng@intel.com>

    [ Upstream commit 861ba6351c520328e94a78c923b415faa9116287 ]

    ACPICA commit 99bc3beca92c6574ea1d69de42e54f872e6373ce

    It is reported that on Linux, RTC driver complains wrong errors on
    hardware reduced platform:
    [ 4.085420] ACPI Warning: Could not enable fixed event - real_time_clock (4) (20160422/evxface-654)

    This patch fixes this by correctly adding runtime reduced hardware check.
    Reported by Chandan Tagore, fixed by Lv Zheng.

    Link: https://github.com/acpica/acpica/commit/99bc3bec
    Tested-by: Chandan Tagore <tagore.chandan@gmail.com>
    Signed-off-by: Lv Zheng <lv.zheng@intel.com>
    Signed-off-by: Bob Moore <robert.moore@intel.com>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    ---
    drivers/acpi/acpica/evxfevnt.c | 18 ++++++++++++++++++
    1 file changed, 18 insertions(+)

    diff --git a/drivers/acpi/acpica/evxfevnt.c b/drivers/acpi/acpica/evxfevnt.c
    index bb8cbf5961bf..d375968c8072 100644
    --- a/drivers/acpi/acpica/evxfevnt.c
    +++ b/drivers/acpi/acpica/evxfevnt.c
    @@ -180,6 +180,12 @@ acpi_status acpi_enable_event(u32 event, u32 flags)

    ACPI_FUNCTION_TRACE(acpi_enable_event);

    + /* If Hardware Reduced flag is set, there are no fixed events */
    +
    + if (acpi_gbl_reduced_hardware) {
    + return_ACPI_STATUS(AE_OK);
    + }
    +
    /* Decode the Fixed Event */

    if (event > ACPI_EVENT_MAX) {
    @@ -237,6 +243,12 @@ acpi_status acpi_disable_event(u32 event, u32 flags)

    ACPI_FUNCTION_TRACE(acpi_disable_event);

    + /* If Hardware Reduced flag is set, there are no fixed events */
    +
    + if (acpi_gbl_reduced_hardware) {
    + return_ACPI_STATUS(AE_OK);
    + }
    +
    /* Decode the Fixed Event */

    if (event > ACPI_EVENT_MAX) {
    @@ -290,6 +302,12 @@ acpi_status acpi_clear_event(u32 event)

    ACPI_FUNCTION_TRACE(acpi_clear_event);

    + /* If Hardware Reduced flag is set, there are no fixed events */
    +
    + if (acpi_gbl_reduced_hardware) {
    + return_ACPI_STATUS(AE_OK);
    + }
    +
    /* Decode the Fixed Event */

    if (event > ACPI_EVENT_MAX) {
    --
    2.14.1
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