[PATCH] drm/ast: Add detect function support

[ainux.wang@gmail.com]

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

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

Signed-off-by: Ainux <ainux.wang@gmail.com>
---
 drivers/gpu/drm/ast/ast_drv.c  |  2 ++
 drivers/gpu/drm/ast/ast_mode.c | 19 ++++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c
index 5aa452b4efe6..6698bbc405e3 100644
--- a/drivers/gpu/drm/ast/ast_drv.c
+++ b/drivers/gpu/drm/ast/ast_drv.c
@@ -128,6 +128,8 @@ static int ast_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	drm_fbdev_generic_setup(dev, 32);
 
+	drm_kms_helper_poll_init(dev);
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index 36d9575aa27b..b4dd4c29b353 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -1293,6 +1293,21 @@ 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;
+	enum drm_connector_status ret = connector_status_connected;
+
+	r = ast_get_modes(connector);
+	if (r)
+		ret = connector_status_connected;
+	else
+		ret = connector_status_disconnected;
+
+	return ret;
+}
+
 static void ast_connector_destroy(struct drm_connector *connector)
 {
 	struct ast_connector *ast_connector = to_ast_connector(connector);
@@ -1307,6 +1322,7 @@ 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 +1350,8 @@ 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);
 
-- 
2.18.1