linux-kernel - [PATCH v2 1/1] drm/bridge: lontium-lt9611uxc: use irq as optional parameter

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Message-Id: <20260107032342.332758-2-vovchkir@gmail.com>
Date: Wed,  7 Jan 2026 06:23:42 +0300
From: Vladimir Yakovlev <vovchkir@...il.com>
To: luca.ceresoli@...tlin.com
Cc: Vladimir Yakovlev <vovchkir@...il.com>,
	Laurent.pinchart@...asonboard.com,
	airlied@...il.com,
	andrzej.hajda@...el.com,
	dmitry.baryshkov@....qualcomm.com,
	dri-devel@...ts.freedesktop.org,
	jernej.skrabec@...il.com,
	jonas@...boo.se,
	linux-kernel@...r.kernel.org,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	neil.armstrong@...aro.org,
	rfoss@...nel.org,
	simona@...ll.ch,
	tzimmermann@...e.de
Subject: [PATCH v2 1/1] drm/bridge: lontium-lt9611uxc: use irq as optional parameter

On some systems the interrupt pin may not be used.
In this case we exclude DRM_BRIDGE_OP_HPD from supported operations,
after which a polling thread is started to detect the connection.
(the default polling period for DRM is 10 seconds)

Signed-off-by: Vladimir Yakovlev <vovchkir@...il.com>
---
 drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
index bb5cff021c93..f7a74ec1f170 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
@@ -851,19 +851,25 @@ static int lt9611uxc_probe(struct i2c_client *client)
 	init_waitqueue_head(&lt9611uxc->wq);
 	INIT_WORK(&lt9611uxc->work, lt9611uxc_hpd_work);
 
-	ret = devm_request_threaded_irq(dev, client->irq, NULL,
-					lt9611uxc_irq_thread_handler,
-					IRQF_ONESHOT, "lt9611uxc", lt9611uxc);
-	if (ret) {
-		dev_err(dev, "failed to request irq\n");
-		goto err_disable_regulators;
+	if (client->irq) {
+		ret = devm_request_threaded_irq(dev, client->irq, NULL,
+						lt9611uxc_irq_thread_handler,
+						IRQF_ONESHOT, "lt9611uxc", lt9611uxc);
+		if (ret) {
+			dev_err(dev, "failed to request irq\n");
+			goto err_disable_regulators;
+		}
+		dev_dbg(dev, "Uses IRQ\n");
+	} else {
+		dev_dbg(dev, "The interrupt (IRQ) is not specified in the DTS.\n");
+		dev_dbg(dev, "Check the interrupt (IRQ) or polling will be used!!!\n");
 	}
 
 	i2c_set_clientdata(client, lt9611uxc);
 
 	lt9611uxc->bridge.of_node = client->dev.of_node;
 	lt9611uxc->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
-	if (lt9611uxc->hpd_supported)
+	if (lt9611uxc->hpd_supported && client->irq)
 		lt9611uxc->bridge.ops |= DRM_BRIDGE_OP_HPD;
 	lt9611uxc->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
 
-- 
2.34.1