linux-kernel - [PATCH v7 5/9] drm: tda998x: use cec_notifier_conn

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Message-Id: <20190814104520.6001-6-darekm@google.com>
Date:   Wed, 14 Aug 2019 12:45:03 +0200
From:   Dariusz Marcinkiewicz <darekm@...gle.com>
To:     dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        hverkuil-cisco@...all.nl
Cc:     Dariusz Marcinkiewicz <darekm@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org
Subject: [PATCH v7 5/9] drm: tda998x: use cec_notifier_conn_(un)register

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 v6:
        - move cec_notifier_conn_unregister to tda998x_bridge_detach,
	- add a mutex protecting accesses to a CEC notifier.
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@...gle.com>
---
 drivers/gpu/drm/i2c/tda998x_drv.c | 36 +++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 61e042918a7fc..643480415473f 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -82,6 +82,8 @@ struct tda998x_priv {
 	u8 audio_port_enable[AUDIO_ROUTE_NUM];
 	struct tda9950_glue cec_glue;
 	struct gpio_desc *calib;
+
+	struct mutex cec_notifiy_mutex;
 	struct cec_notifier *cec_notify;
 };
 
@@ -805,8 +807,11 @@ static irqreturn_t tda998x_irq_thread(int irq, void *data)
 				tda998x_edid_delay_start(priv);
 			} else {
 				schedule_work(&priv->detect_work);
-				cec_notifier_set_phys_addr(priv->cec_notify,
-						   CEC_PHYS_ADDR_INVALID);
+
+				mutex_lock(&priv->cec_notifiy_mutex);
+				cec_notifier_phys_addr_invalidate(
+						priv->cec_notify);
+				mutex_unlock(&priv->cec_notifiy_mutex);
 			}
 
 			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 +1354,16 @@ 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);
+		return -ENOMEM;
+
+	mutex_lock(&priv->cec_notifiy_mutex);
+	priv->cec_notify = notifier;
+	mutex_unlock(&priv->cec_notifiy_mutex);
+
 	drm_connector_attach_encoder(&priv->connector,
 				     priv->bridge.encoder);
 
@@ -1366,6 +1383,11 @@ static void tda998x_bridge_detach(struct drm_bridge *bridge)
 {
 	struct tda998x_priv *priv = bridge_to_tda998x_priv(bridge);
 
+	mutex_lock(&priv->cec_notifiy_mutex);
+	cec_notifier_conn_unregister(priv->cec_notify);
+	priv->cec_notify = NULL;
+	mutex_unlock(&priv->cec_notifiy_mutex);
+
 	drm_connector_cleanup(&priv->connector);
 }
 
@@ -1789,9 +1811,6 @@ static void tda998x_destroy(struct device *dev)
 	cancel_work_sync(&priv->detect_work);
 
 	i2c_unregister_device(priv->cec);
-
-	if (priv->cec_notify)
-		cec_notifier_put(priv->cec_notify);
 }
 
 static int tda998x_create(struct device *dev)
@@ -1812,6 +1831,7 @@ static int tda998x_create(struct device *dev)
 	mutex_init(&priv->mutex);	/* protect the page access */
 	mutex_init(&priv->audio_mutex); /* protect access from audio thread */
 	mutex_init(&priv->edid_mutex);
+	mutex_init(&priv->cec_notifiy_mutex);
 	INIT_LIST_HEAD(&priv->bridge.list);
 	init_waitqueue_head(&priv->edid_delay_waitq);
 	timer_setup(&priv->edid_delay_timer, tda998x_edid_delay_done, 0);
@@ -1916,12 +1936,6 @@ 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