[PATCH v4 01/19] drm/encoder: make encoder control functions optional

[Philipp Zabel <p.zabel@pengutronix.de>]

Simple managed encoders do not require the .destroy callback,
make the whole funcs structure optional.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
New in v4.
---
 drivers/gpu/drm/drm_encoder.c     | 4 ++--
 drivers/gpu/drm/drm_mode_config.c | 5 +++--
 include/drm/drm_encoder.h         | 2 +-
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
index e555281f43d4..b0b86a3c08f5 100644
--- a/drivers/gpu/drm/drm_encoder.c
+++ b/drivers/gpu/drm/drm_encoder.c
@@ -72,7 +72,7 @@ int drm_encoder_register_all(struct drm_device *dev)
 	int ret = 0;
 
 	drm_for_each_encoder(encoder, dev) {
-		if (encoder->funcs->late_register)
+		if (encoder->funcs && encoder->funcs->late_register)
 			ret = encoder->funcs->late_register(encoder);
 		if (ret)
 			return ret;
@@ -86,7 +86,7 @@ void drm_encoder_unregister_all(struct drm_device *dev)
 	struct drm_encoder *encoder;
 
 	drm_for_each_encoder(encoder, dev) {
-		if (encoder->funcs->early_unregister)
+		if (encoder->funcs && encoder->funcs->early_unregister)
 			encoder->funcs->early_unregister(encoder);
 	}
 }
diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index f1affc1bb679..87e144155456 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -195,7 +195,7 @@ void drm_mode_config_reset(struct drm_device *dev)
 			crtc->funcs->reset(crtc);
 
 	drm_for_each_encoder(encoder, dev)
-		if (encoder->funcs->reset)
+		if (encoder->funcs && encoder->funcs->reset)
 			encoder->funcs->reset(encoder);
 
 	drm_connector_list_iter_begin(dev, &conn_iter);
@@ -487,7 +487,8 @@ void drm_mode_config_cleanup(struct drm_device *dev)
 
 	list_for_each_entry_safe(encoder, enct, &dev->mode_config.encoder_list,
 				 head) {
-		encoder->funcs->destroy(encoder);
+		if (encoder->funcs)
+			encoder->funcs->destroy(encoder);
 	}
 
 	drm_connector_list_iter_begin(dev, &conn_iter);
diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h
index 5dfa5f7a80a7..833123637fbf 100644
--- a/include/drm/drm_encoder.h
+++ b/include/drm/drm_encoder.h
@@ -89,7 +89,7 @@ struct drm_encoder_funcs {
  * @head: list management
  * @base: base KMS object
  * @name: human readable name, can be overwritten by the driver
- * @funcs: control functions
+ * @funcs: control functions, can be NULL for simple managed encoders
  * @helper_private: mid-layer private data
  *
  * CRTCs drive pixels to encoders, which convert them into signals
-- 
2.20.1

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