drm/radeon/kms: disable output polling when suspended

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>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index cec51a5..49f7cb7 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -883,6 +883,8 @@ int radeon_suspend_kms(struct drm_device *dev, pm_message_t state)
        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);
@@ -972,6 +974,8 @@ int radeon_resume_kms(struct drm_device *dev)
        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;
 }