drm: properly init/reset connector status

This can help drivers to make somewhat intelligent decisions in their
->detect callback: If the connector is hpd capable and in the unknown
state, the driver needs to force a full detect cycle. Otherwise it
could just (if it chooses so) to update the connector state from it's
hpd handler directly, and always return that in the ->detect callback.

Atm only drm/i915 calls drm_mode_config_reset at resume time, so other
drivers would need to add that call first before using this facility.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 6a1b2cc39898..d6d007275947 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -553,6 +553,7 @@ int drm_connector_init(struct drm_device *dev,
         INIT_LIST_HEAD(&connector->probed_modes);
         INIT_LIST_HEAD(&connector->modes);
         connector->edid_blob_ptr = NULL;
+        connector->status = connector_status_unknown;
 
         list_add_tail(&connector->head, &dev->mode_config.connector_list);
         dev->mode_config.num_connector++;
@@ -3672,9 +3673,12 @@ void drm_mode_config_reset(struct drm_device *dev)
                 if (encoder->funcs->reset)
                         encoder->funcs->reset(encoder);
 
-        list_for_each_entry(connector, &dev->mode_config.connector_list, head)
+        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+                connector->status = connector_status_unknown;
+
                 if (connector->funcs->reset)
                         connector->funcs->reset(connector);
+        }
 }
 EXPORT_SYMBOL(drm_mode_config_reset);