linux-kernel - [PATCH] drm/bridge: lontium-lt9611uxc: start wake all thread when call detect()

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Message-Id: <20251208161842.3764029-1-vovchkir@gmail.com>
Date: Mon,  8 Dec 2025 19:18:42 +0300
From: Vladimir Yakovlev <vovchkir@...il.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Vladimir Yakovlev <vovchkir@...il.com>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/bridge: lontium-lt9611uxc: start wake all thread when call detect()

The chip does not receive an interrupt if the monitor was connected
before powering up.
Therefore, you need to wake up the task if the necessary bits are set
when calling bridge_detect() after DRM is started.

Signed-off-by: Vladimir Yakovlev <vovchkir@...il.com>
---
 drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
index 4d550cd1a9a1..70672024d643 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
@@ -363,17 +363,24 @@ lt9611uxc_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connect
 	unsigned int reg_val = 0;
 	int ret;
 	bool connected = true;
+	bool edid_read = true;
 
 	lt9611uxc_lock(lt9611uxc);
 
 	if (lt9611uxc->hpd_supported) {
 		ret = regmap_read(lt9611uxc->regmap, 0xb023, &reg_val);
 
-		if (ret)
+		if (ret) {
 			dev_err(lt9611uxc->dev, "failed to read hpd status: %d\n", ret);
-		else
+		} else {
+			dev_dbg(lt9611uxc->dev, "detect() reg[0xb023]=0x%02X\n", reg_val);
 			connected  = reg_val & BIT(1);
+			edid_read = reg_val & BIT(0);
+			if (edid_read)
+				wake_up_all(&lt9611uxc->wq);
+		}
 	}
+	lt9611uxc->edid_read = edid_read;
 	lt9611uxc->hdmi_connected = connected;
 
 	lt9611uxc_unlock(lt9611uxc);
-- 
2.34.1