From nobody Sun Feb 8 20:31:27 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 4DFB119B586 for ; Wed, 8 Jan 2025 05:44:50 +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=1736315091; cv=none; b=qQg95f7rOFThJweykn8Z0IvWl1FJFZEASsBfHgujNVSpcY2KDcCnOctbTO3XnYEPRlRHkxqNw/6OEIkM2bqtukHUVGe20TEPyAVyb/BR74brJfaBAODfWff8n+hQdzxzVHAa3qzVtnVIRvmwbtbef7rWQ23UF9ei+ocz445eToU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736315091; c=relaxed/simple; bh=H8TKNe72LwwgTZTKmN5zb4MNiboPv8kWdjIP8rOTDOU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=JFJz/EAsTmRbcWdo4plpca73uC9FVILkeTDvAYgoUf1cVZ8T0ItaNqmOyEH35i4dPCPtjCpNCqJ7PyB4yYFTrtf5ykGASbmgNWur8HePNzss4wVzjdbMLCsuGjJOgfL/FBslWlFJbw6bzauWUvq95v/cEx90kD13wqSc+u+h01E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=J+XM6SGg; 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="J+XM6SGg" Received: by smtp.kernel.org (Postfix) with ESMTPS id C10F6C4CED0; Wed, 8 Jan 2025 05:44:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1736315090; bh=H8TKNe72LwwgTZTKmN5zb4MNiboPv8kWdjIP8rOTDOU=; h=From:Date:Subject:To:Cc:Reply-To:From; b=J+XM6SGgTZkO+9w8ZU9/zOEAnjXWMn96BuQM5ldBf4nEuLZ71ubbl8mB44WZIb+xQ nkdwkgRhxnL+ecHGAiPNKacmBq/MHdS6kSr3+dYnlb7OxF1SRcj37L9ZQ5BNeNULya E4J3iS7Ir0ol1Zyblk0d0nfnBsSpSVM0Q2Ud4WEIRclT08G/N9xdujtL2jmiHsV4Xw M/Snydl/FBGN63jkEyrytjjVsiIspBGc4XWCu4j63HgWWjZBOoNDXwlRrCTjw0kO8Z 35xzeNkYuBvlmuS28ohU6FdbUNMfVyhL6D4rm9kAXG//iiiIYh8hUHbM3o7yhs8up4 eK4XhnBwJqefQ== 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 A90F4E77199; Wed, 8 Jan 2025 05:44:50 +0000 (UTC) From: Hermes Wu via B4 Relay Date: Wed, 08 Jan 2025 13:45:14 +0800 Subject: [PATCH] drm/bridge: it6505: fix HDCP V match check is not performed correctly 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: <20250108-fix-hdcp-v-comp-v1-1-9404811825cd@ite.com.tw> X-B4-Tracking: v=1; b=H4sIAOkQfmcC/x2MQQqAIBAAvyJ7bkGTMPpKdDBdcw+VKEQg/j3pO DAzFQplpgKLqJDp4cL31UENAly010HIvjOMcpykkgYDvxi9S/igu8+EerczaW+sDxp6lTJ15T+ uW2sfDVAWQWEAAAA= X-Change-ID: 20250107-fix-hdcp-v-comp-3ba8e3d7adf3 To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Dmitry Baryshkov , Hermes Wu , AngeloGioacchino Del Regno Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Pet.Weng@ite.com.tw, Kenneth.Hung@ite.com.tw, treapking@chromium.org, Hermes Wu X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1736315115; l=1308; i=Hermes.wu@ite.com.tw; s=20241230; h=from:subject:message-id; bh=dyqbMaHoVsNvXn2a4OvVKxfPmk0+fIgLG5w+5YquGSw=; b=EGl+6seblMN/cphHfmfQmu8+zLNtcMleHGGC73U98PAlFWJbhZUhbWi9bnXbkwWE+NLl4YJxE nThd4mrPDQCBAQTS5xdVBUtJist3GUlzl19zpwb1gmXlkAPnpSP6fwt 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 The loop of V compare is expected to iterate for 5 times which compare V array form av[0][] to av[4][]. It should check loop counter reach the last statement before return true Fixes: 0989c02c7a5c ("drm/bridge: it6505: fix HDCP CTS compare V matching") Signed-off-by: Hermes Wu --- drivers/gpu/drm/bridge/ite-it6505.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/i= te-it6505.c index 88ef76a37fe6accacdd343839ff2569b31b18ceb..e87247aea1d2ffbdad192e24105= 6d34fdfb32163 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -2254,9 +2254,12 @@ static bool it6505_hdcp_part2_ksvlist_check(struct i= t6505 *it6505) if (bv[i][3] !=3D av[i][0] || bv[i][2] !=3D av[i][1] || av[i][1] !=3D av[i][2] || bv[i][0] !=3D av[i][3]) break; - - DRM_DEV_DEBUG_DRIVER(dev, "V' all match!! %d, %d", retry, i); - return true; + if (i =3D=3D 4) { + DRM_DEV_DEBUG_DRIVER(dev, + "V' all match!! %d", + retry); + return true; + } } } =20 --- base-commit: 938fbb16aba8f7b88e0fdcf56f315a5bbad41aad change-id: 20250107-fix-hdcp-v-comp-3ba8e3d7adf3 Best regards, --=20 Hermes Wu