From nobody Mon Feb 9 02:43:01 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4CF643191AF for ; Mon, 12 Jan 2026 06:46:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768200363; cv=none; b=uW30A26eP8blAt8up74v+13QhQe7hIWYfz8NsozGAGh2DBx7P7BFkMElWMojlKADK3gtU95yHzCctb1mgi9wuaUf0qsLiEZE1JCOTOcWPsVXvHQDuxjQ8QpBD75gK8FsoaiDIGD0PrlRFRc3Or0YbCCFQO+bh5C1pDtusEdtLsk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768200363; c=relaxed/simple; bh=T+6DAB5U+aymplM4EogtY9wqWk51pwq6UxFmNbuENE0=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=kqUZWYVbzhSdt3xKFoZ9PSxsbD00gONhJEAJWw+GaQ+OpMZxqe7KL2O+NxphhDASI5YfZmJvtmT4JSVANAK8/YzFOYrVCOYWySMSqGxid6rglVDbNIdA/elNvy/qvBvDRvdENTi2DVfAyo88n7sevQVxMexfLg1Ek2oYXlvoMR0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=tbfZrKbx; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="tbfZrKbx" Received: by smtp.kernel.org (Postfix) with ESMTPS id DA53FC116D0; Mon, 12 Jan 2026 06:46:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768200362; bh=T+6DAB5U+aymplM4EogtY9wqWk51pwq6UxFmNbuENE0=; h=From:Date:Subject:To:Cc:Reply-To:From; b=tbfZrKbxOiISXeXUJid3i04ienS21t35b4CjUdrYP/OKE5PQG5QcCHI3TCdaxe7D8 8DHNusUeVVo+Jfkh8h+vc4HkM4IW8DEkUoqXRs6q9pFP+gxK+a/Jevbhi+Ov3KXUBp bvmipZ776SVylDNY2CG8FKeJ3R03bSkQBMAtH+Ixlxbv/yphT3Ep8EgC9a8zp31+13 /pkCyI+l20BpTZpaSC8n7xr2/aga8zZCG76OVBi49bMj1BBKQgP8SwbU5Bf6R3R+fa 5ob3msmF1rX/xSZUekMnBYKux2ktODdxZO5XokqfwRByszFHczYBcA+Dv0029QpNPl kB1ESOaoNI/yg== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id C8360D2503B; Mon, 12 Jan 2026 06:46:02 +0000 (UTC) From: Hermes Wu via B4 Relay Date: Mon, 12 Jan 2026 14:47:07 +0800 Subject: [PATCH] drm/bridge: it6505: disable HDCP retry when KSV list timeout Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260112-disable-hdcp-auto-retry-v1-1-dc9217f08f7c@ite.com.tw> X-B4-Tracking: v=1; b=H4sIAOqYZGkC/x3MMQqAMAxA0atIZgNth6JeRRxiGzUgKqmKIt7d4 viG/x9IrMIJmuIB5VOSrEuGLQsIEy0jo8RscMZ5Y63DKIn6mXGKYUM69hWVd73RUxWNGXxProZ cb8qDXP+57d73A4D9RE9pAAAA X-Change-ID: 20260112-disable-hdcp-auto-retry-6a8d00f6ba29 To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Cc: Pet.Weng@ite.com.tw, Kenneth.Hung@ite.com.tw, treapking@chromium.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Hermes Wu X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1768200435; l=1553; i=Hermes.wu@ite.com.tw; s=20241230; h=from:subject:message-id; bh=rCW3jddM8TQgyxZZEpHfDk8/Yn8r6UZLGkwB+J85M8A=; b=7A7jap0TA1DohHAgYYmCcYl1NvpnYzSGNv+i1t3xfwhcNzW/K+OvbUDvCRlUdUPNYksWhPW6n ku9ky5ji0efD3VRnbEgNU/W8mhV7rEfdjoyUPEQMYt+3f6A0E2XVlM+ X-Developer-Key: i=Hermes.wu@ite.com.tw; a=ed25519; pk=qho5Dawp2WWj9CGyjtJ6/Y10xH8odjRdS6SXDaDAerU= X-Endpoint-Received: by B4 Relay for Hermes.wu@ite.com.tw/20241230 with auth_id=310 X-Original-From: Hermes Wu Reply-To: Hermes.wu@ite.com.tw From: Hermes Wu Some DP to HDMI converters fail to report KSV list within the 6-second HDCP window, causing the IT6505 to repeatedly restart authentication. This results in continuous flickering on the connected HDMI monitor. Disable automatic HDCP retry when KSV list timeout. This breaks the re-auth loop and significantly improves stability/user experience with problematic converters. Signed-off-by: Hermes Wu --- drivers/gpu/drm/bridge/ite-it6505.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/i= te-it6505.c index a094803ba7aa4e12165fcde432d4e6417fbf3676..1c1e6b78fadbf29da00a68e2667= 1ce5b54ee1557 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -2238,7 +2238,7 @@ static void it6505_hdcp_wait_ksv_list(struct work_str= uct *work) return; =20 timeout: - it6505_start_hdcp(it6505); + it6505_stop_hdcp(it6505); } =20 static void it6505_hdcp_work(struct work_struct *work) @@ -2596,7 +2596,7 @@ static void it6505_irq_hdcp_fail(struct it6505 *it650= 5) DRM_DEV_DEBUG_DRIVER(dev, "hdcp fail interrupt"); it6505->hdcp_status =3D HDCP_AUTH_IDLE; it6505_show_hdcp_info(it6505); - it6505_start_hdcp(it6505); + it6505_stop_hdcp(it6505); } =20 static void it6505_irq_aux_cmd_fail(struct it6505 *it6505) --- base-commit: 38feb171b3f92d77e8061fafb5ddfffc2c13b672 change-id: 20260112-disable-hdcp-auto-retry-6a8d00f6ba29 Best regards, --=20 Hermes Wu