[PATCH v6 4/8] drm: tda998x: use cec_notifier_conn_(un)register

[Dariusz Marcinkiewicz]

Use the new cec_notifier_conn_(un)register() functions to
(un)register the notifier for the HDMI connector, and fill
in the cec_connector_info.

Changes since v2:
	- cec_notifier_phys_addr_invalidate where appropriate,
	- don't check for NULL notifier before calling
	cec_notifier_conn_unregister.
Changes since v1:
	Add memory barrier to make sure that the notifier
	becomes visible to the irq thread once it is
	fully constructed.

Signed-off-by: Dariusz Marcinkiewicz <darekm at google.com>
Tested-by: Hans Verkuil <hverkuil-cisco at xs4all.nl>
---
 drivers/gpu/drm/i2c/tda998x_drv.c | 33 +++++++++++++++++++++----------
 1 file changed, 23 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 61e042918a7fc..19a63ee1b3f53 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -804,9 +804,14 @@ static irqreturn_t tda998x_irq_thread(int irq, void *data)
 			if (lvl & CEC_RXSHPDLEV_HPD) {
 				tda998x_edid_delay_start(priv);
 			} else {
+				struct cec_notifier *notify;
+
 				schedule_work(&priv->detect_work);
-				cec_notifier_set_phys_addr(priv->cec_notify,
-						   CEC_PHYS_ADDR_INVALID);
+
+				notify = READ_ONCE(priv->cec_notify);
+				if (notify)
+					cec_notifier_phys_addr_invalidate(
+							notify);
 			}
 
 			handled = true;
@@ -1331,6 +1336,8 @@ static int tda998x_connector_init(struct tda998x_priv *priv,
 				  struct drm_device *drm)
 {
 	struct drm_connector *connector = &priv->connector;
+	struct cec_connector_info conn_info;
+	struct cec_notifier *notifier;
 	int ret;
 
 	connector->interlace_allowed = 1;
@@ -1347,6 +1354,19 @@ static int tda998x_connector_init(struct tda998x_priv *priv,
 	if (ret)
 		return ret;
 
+	cec_fill_conn_info_from_drm(&conn_info, connector);
+
+	notifier = cec_notifier_conn_register(priv->cec_glue.parent,
+					      NULL, &conn_info);
+	if (!notifier)
+		return -ENOMEM;
+	/*
+	 * Make sure that tda998x_irq_thread does see the notifier
+	 * when it fully constructed.
+	 */
+	smp_wmb();
+	priv->cec_notify = notifier;
+
 	drm_connector_attach_encoder(&priv->connector,
 				     priv->bridge.encoder);
 
@@ -1790,8 +1810,7 @@ static void tda998x_destroy(struct device *dev)
 
 	i2c_unregister_device(priv->cec);
 
-	if (priv->cec_notify)
-		cec_notifier_put(priv->cec_notify);
+	cec_notifier_conn_unregister(priv->cec_notify);
 }
 
 static int tda998x_create(struct device *dev)
@@ -1916,12 +1935,6 @@ static int tda998x_create(struct device *dev)
 		cec_write(priv, REG_CEC_RXSHPDINTENA, CEC_RXSHPDLEV_HPD);
 	}
 
-	priv->cec_notify = cec_notifier_get(dev);
-	if (!priv->cec_notify) {
-		ret = -ENOMEM;
-		goto fail;
-	}
-
 	priv->cec_glue.parent = dev;
 	priv->cec_glue.data = priv;
 	priv->cec_glue.init = tda998x_cec_hook_init;
-- 
2.23.0.rc1.153.gdeed80330f-goog