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    Subject[patch 22/55] drm/radeon/kms: disable output polling when suspended
    3.0-stable review patch.  If anyone has any objections, please let me know.

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

    From: Seth Forshee <seth.forshee@canonical.com>

    commit 86698c20f71d488b32c49ed4687fb3cf8a88a5ca upstream.

    Polling the outputs when the device is suspended can result in erroneous
    status updates. Disable output polling during suspend to prevent this
    from happening.

    Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
    Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/radeon/radeon_device.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/drivers/gpu/drm/radeon/radeon_device.c
    +++ b/drivers/gpu/drm/radeon/radeon_device.c
    @@ -857,6 +857,8 @@ int radeon_suspend_kms(struct drm_device
    if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
    return 0;

    + drm_kms_helper_poll_disable(dev);
    +
    /* turn off display hw */
    list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
    drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
    @@ -943,6 +945,8 @@ int radeon_resume_kms(struct drm_device
    list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
    drm_helper_connector_dpms(connector, DRM_MODE_DPMS_ON);
    }
    +
    + drm_kms_helper_poll_enable(dev);
    return 0;
    }




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