[PATCH v2] drm/ast: Add detect function support

[ainux . wang]

From: Ainux <ainux.w...@gmail.com>

The existence of the connector cannot be detected,
so add the detect function to support.

Signed-off-by: Ainux <ainux.w...@gmail.com>
---
 drivers/gpu/drm/ast/ast_mode.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index 36d9575aa27b..e5996ae03c49 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -1293,6 +1293,18 @@ static enum drm_mode_status ast_mode_valid(struct 
drm_connector *connector,
        return flags;
 }
 
+static enum drm_connector_status ast_connector_detect(struct drm_connector
+                                                  *connector, bool force)
+{
+       int r;
+
+       r = ast_get_modes(connector);
+       if (r < 0)
+               return connector_status_disconnected;
+
+       return connector_status_connected;
+}
+
 static void ast_connector_destroy(struct drm_connector *connector)
 {
        struct ast_connector *ast_connector = to_ast_connector(connector);
@@ -1307,6 +1319,7 @@ static const struct drm_connector_helper_funcs 
ast_connector_helper_funcs = {
 
 static const struct drm_connector_funcs ast_connector_funcs = {
        .reset = drm_atomic_helper_connector_reset,
+       .detect = ast_connector_detect,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .destroy = ast_connector_destroy,
        .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
@@ -1334,7 +1347,8 @@ static int ast_connector_init(struct drm_device *dev)
        connector->interlace_allowed = 0;
        connector->doublescan_allowed = 0;
 
-       connector->polled = DRM_CONNECTOR_POLL_CONNECT;
+       connector->polled = DRM_CONNECTOR_POLL_CONNECT |
+                                               DRM_CONNECTOR_POLL_DISCONNECT;
 
        drm_connector_attach_encoder(connector, encoder);
 
@@ -1403,6 +1417,8 @@ int ast_mode_config_init(struct ast_private *ast)
 
        drm_mode_config_reset(dev);
 
+       drm_kms_helper_poll_init(dev);
+
        return 0;
 }
 
-- 
2.18.1