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    Subject[PATCH 4.6 130/203] drm/amd/powerplay: need to notify system bios pcie device ready
    Date
    4.6-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Rex Zhu <Rex.Zhu@amd.com>

    commit 0a4fef559b69ae2e682c98f31d53a225fbda78bd upstream.

    before request performance state.

    Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
    Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
    Reviewed-by: Ken Wang <Qingqing.Wang@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c | 16 +++++++++++++++-
    drivers/gpu/drm/amd/powerplay/inc/pp_acpi.h | 1 +
    2 files changed, 16 insertions(+), 1 deletion(-)

    --- a/drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c
    +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c
    @@ -21,6 +21,20 @@ bool acpi_atcs_functions_supported(void
    return result == 0 ? (output_buf.function_bits & (1 << (index - 1))) != 0 : false;
    }

    +bool acpi_atcs_notify_pcie_device_ready(void *device)
    +{
    + int32_t temp_buffer = 1;
    +
    + return cgs_call_acpi_method(device, CGS_ACPI_METHOD_ATCS,
    + ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION,
    + &temp_buffer,
    + NULL,
    + 0,
    + sizeof(temp_buffer),
    + 0);
    +}
    +
    +
    int acpi_pcie_perf_request(void *device, uint8_t perf_req, bool advertise)
    {
    struct atcs_pref_req_input atcs_input;
    @@ -29,7 +43,7 @@ int acpi_pcie_perf_request(void *device,
    int result;
    struct cgs_system_info info = {0};

    - if (!acpi_atcs_functions_supported(device, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST))
    + if( 0 != acpi_atcs_notify_pcie_device_ready(device))
    return -EINVAL;

    info.size = sizeof(struct cgs_system_info);
    --- a/drivers/gpu/drm/amd/powerplay/inc/pp_acpi.h
    +++ b/drivers/gpu/drm/amd/powerplay/inc/pp_acpi.h
    @@ -26,3 +26,4 @@ extern bool acpi_atcs_functions_supporte
    extern int acpi_pcie_perf_request(void *device,
    uint8_t perf_req,
    bool advertise);
    +extern bool acpi_atcs_notify_pcie_device_ready(void *device);

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