linux-kernel - [PATCH] drm/bridge: lt9611uxc: reset edid

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Message-Id: <20250730-lt9611uxc-reset-edid-v1-1-3ea4d5b16197@oss.qualcomm.com>
Date: Wed, 30 Jul 2025 20:01:10 +0530
From: Nilesh Laad <nilesh.laad@....qualcomm.com>
To: 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>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        venkata.valluru@....qualcomm.com, jessica.zhang@....qualcomm.com,
        Nilesh Laad <nilesh.laad@....qualcomm.com>
Subject: [PATCH] drm/bridge: lt9611uxc: reset edid_read on disconnect

Currently edid_read has value from previous connect session
and resulting in drm using older edid before new edid is available
in lt9611uxc.
Reset edid_read so that correct status is updated and correct edid
is available for drm.

Signed-off-by: Nilesh Laad <nilesh.laad@....qualcomm.com>
---
 drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
index 38fb8776c0f4..f5c887d126fe 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
@@ -171,6 +171,9 @@ static void lt9611uxc_hpd_work(struct work_struct *work)
 	connected = lt9611uxc->hdmi_connected;
 	mutex_unlock(&lt9611uxc->ocm_lock);
 
+	if (!connected)
+		lt9611uxc->edid_read = false;
+
 	drm_bridge_hpd_notify(&lt9611uxc->bridge,
 			      connected ?
 			      connector_status_connected :

---
base-commit: 85c23f28905cf20a86ceec3cfd7a0a5572c9eb13
change-id: 20250730-lt9611uxc-reset-edid-cc03c5b4bc60

Best regards,
--  
Nilesh Laad <nilesh.laad@....qualcomm.com>