[PATCH v3 8/9] drm: dw-hdmi: use cec_notifier_conn_(un)register

[Dariusz Marcinkiewicz <darekm@xxxxxxxxxx>]

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:
	- removed unnecessary NULL check before a call to
	cec_notifier_conn_unregister,
	- use cec_notifier_phys_addr_invalidate to invalidate physical
	address.
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@xxxxxxxxxx>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 36 ++++++++++++++---------
 1 file changed, 22 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index ab7968c8f6a29..1e183af0e1ab1 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2118,6 +2118,8 @@ static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
 	struct dw_hdmi *hdmi = bridge->driver_private;
 	struct drm_encoder *encoder = bridge->encoder;
 	struct drm_connector *connector = &hdmi->connector;
+	struct cec_connector_info conn_info;
+	struct cec_notifier *notifier;
 
 	connector->interlace_allowed = 1;
 	connector->polled = DRM_CONNECTOR_POLL_HPD;
@@ -2129,6 +2131,18 @@ static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
 
 	drm_connector_attach_encoder(connector, encoder);
 
+	cec_fill_conn_info_from_drm(&conn_info, connector);
+
+	notifier = cec_notifier_conn_register(hdmi->dev, NULL, &conn_info);
+	if (!notifier)
+		return -ENOMEM;
+	/*
+	 * Make sure that dw_hdmi_irq thread does see the notifier
+	 * when it fully constructed.
+	 */
+	smp_wmb();
+	hdmi->cec_notifier = notifier;
+
 	return 0;
 }
 
@@ -2295,9 +2309,13 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
 				       phy_stat & HDMI_PHY_HPD,
 				       phy_stat & HDMI_PHY_RX_SENSE);
 
-		if ((phy_stat & (HDMI_PHY_RX_SENSE | HDMI_PHY_HPD)) == 0)
-			cec_notifier_set_phys_addr(hdmi->cec_notifier,
-						   CEC_PHYS_ADDR_INVALID);
+		if ((phy_stat & (HDMI_PHY_RX_SENSE | HDMI_PHY_HPD)) == 0) {
+			struct cec_notifier *notifer;
+
+			notifer = READ_ONCE(hdmi->cec_notifier);
+			if (notifer)
+				cec_notifier_phys_addr_invalidate(notifer);
+		}
 	}
 
 	if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
@@ -2600,12 +2618,6 @@ __dw_hdmi_probe(struct platform_device *pdev,
 	if (ret)
 		goto err_iahb;
 
-	hdmi->cec_notifier = cec_notifier_get(dev);
-	if (!hdmi->cec_notifier) {
-		ret = -ENOMEM;
-		goto err_iahb;
-	}
-
 	/*
 	 * To prevent overflows in HDMI_IH_FC_STAT2, set the clk regenerator
 	 * N and cts values before enabling phy
@@ -2693,9 +2705,6 @@ __dw_hdmi_probe(struct platform_device *pdev,
 		hdmi->ddc = NULL;
 	}
 
-	if (hdmi->cec_notifier)
-		cec_notifier_put(hdmi->cec_notifier);
-
 	clk_disable_unprepare(hdmi->iahb_clk);
 	if (hdmi->cec_clk)
 		clk_disable_unprepare(hdmi->cec_clk);
@@ -2717,8 +2726,7 @@ static void __dw_hdmi_remove(struct dw_hdmi *hdmi)
 	/* Disable all interrupts */
 	hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0);
 
-	if (hdmi->cec_notifier)
-		cec_notifier_put(hdmi->cec_notifier);
+	cec_notifier_conn_unregister(hdmi->cec_notifier);
 
 	clk_disable_unprepare(hdmi->iahb_clk);
 	clk_disable_unprepare(hdmi->isfr_clk);
-- 
2.22.0.510.g264f2c817a-goog