[RFC] drm/connector: Set the default callback function for drm_connector_funcs

[Tian Tao]

The member functions of drm_connector_funcs are not specific to each
manufacturer's driver, so drm_connector_funcs is allowed to use default
values, which prevents all drivers from setting the same member
functions for drm_connector_funcs.

Signed-off-by: Tian Tao <tiantao6 at hisilicon.com>
---
 drivers/gpu/drm/drm_connector.c                  | 7 ++++++-
 drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c | 1 -
 include/drm/drm_connector.h                      | 2 +-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 98b6ec4..356d8a3 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -25,6 +25,7 @@
 #include <drm/drm_encoder.h>
 #include <drm/drm_utils.h>
 #include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_file.h>
 #include <drm/drm_sysfs.h>
@@ -216,7 +217,7 @@ void drm_connector_free_work_fn(struct work_struct *work)
  */
 int drm_connector_init(struct drm_device *dev,
 		       struct drm_connector *connector,
-		       const struct drm_connector_funcs *funcs,
+		       struct drm_connector_funcs *funcs,
 		       int connector_type)
 {
 	struct drm_mode_config *config = &dev->mode_config;
@@ -228,6 +229,10 @@ int drm_connector_init(struct drm_device *dev,
 		(!funcs->atomic_destroy_state ||
 		 !funcs->atomic_duplicate_state));
 
+	if (!funcs->fill_modes)
+		funcs->fill_modes = &drm_helper_probe_single_connector_modes;
+
+
 	ret = __drm_mode_object_add(dev, &connector->base,
 				    DRM_MODE_OBJECT_CONNECTOR,
 				    false, drm_connector_free);
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
index c76f996..7d3b662 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
@@ -64,7 +64,6 @@ static const struct drm_connector_helper_funcs
 };
 
 static const struct drm_connector_funcs hibmc_connector_funcs = {
-	.fill_modes = drm_helper_probe_single_connector_modes,
 	.destroy = hibmc_connector_destroy,
 	.reset = drm_atomic_helper_connector_reset,
 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 1922b27..4810583 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1561,7 +1561,7 @@ struct drm_connector {
 
 int drm_connector_init(struct drm_device *dev,
 		       struct drm_connector *connector,
-		       const struct drm_connector_funcs *funcs,
+		       struct drm_connector_funcs *funcs,
 		       int connector_type);
 int drm_connector_init_with_ddc(struct drm_device *dev,
 				struct drm_connector *connector,
-- 
2.7.4