drm/radeon/kms: don't poll dac load detect.

This is slightly destructive, cpu intensive and can cause lockups.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index 64c3ddf02167..4dac4b0a02ee 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -663,6 +663,11 @@ radeon_vga_detect(struct drm_connector *connector, bool force)
                                 ret = connector_status_connected;
                 }
         } else {
+
+                /* if we aren't forcing don't do destructive polling */
+                if (!force)
+                        return connector->status;
+
                 if (radeon_connector->dac_load_detect && encoder) {
                         encoder_funcs = encoder->helper_private;
                         ret = encoder_funcs->detect(encoder, connector);
@@ -850,6 +855,11 @@ radeon_dvi_detect(struct drm_connector *connector, bool force)
         if ((ret == connector_status_connected) && (radeon_connector->use_digital == true))
                 goto out;
 
+        if (!force) {
+                ret = connector->status;
+                goto out;
+        }
+
         /* find analog encoder */
         if (radeon_connector->dac_load_detect) {
                 for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {