From mboxrd@z Thu Jan 1 00:00:00 1970 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 CAA27AD4B for ; Wed, 26 Mar 2025 05:33:40 +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=1742967220; cv=none; b=LFiNPX30MP7oME2Yffry2fTspFs7Z/wMaznQ6vSBasANShVlA9v1deg9gGoRvEa0cMnzrrdaTEZ2AtviEsVVYfgGeniGiJJMaXiGE+0WVF+srIsqoxI7/xljtXsjniFOWf8QiOuC0NxX9Bzoew5fuJ9rEF5LMbyuWf+Y4WcRD0M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742967220; c=relaxed/simple; bh=oKGOdDgxhAqNZ5oSM5iv/OnF2CxCH6tBHGl2VSB8qc8=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=EDJhCIpm9Gm9eNMfW1koYPlBVVENoP8c1u2PhcDwjCANRw7qyc2r6rgmo8siO0Yo0ILCPHg0NMBGgALkIP78sAkKejhc6CNw4NSVy4Q+TmIl5VbYeqIF0CQtVNO3K9iz9U4AugjETKd+2NZ/kMPZmU6fUtGkLl793UbNf84+7qE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=C2so4mAk; 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="C2so4mAk" Received: by smtp.kernel.org (Postfix) with ESMTPS id 1EFC7C4CEE2; Wed, 26 Mar 2025 05:33:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1742967220; bh=oKGOdDgxhAqNZ5oSM5iv/OnF2CxCH6tBHGl2VSB8qc8=; h=From:Subject:Date:To:Cc:Reply-To:From; b=C2so4mAkFdfZgTI5w7njInHi+EKOorVmxjIdp7Hct9OFYaF1ypELS+A5Fzob4l8Kh kEOdyJ2TgGcDXjQDO3dr0Qhke8GJRE5TNaRkQARzcRgRqi+BDEQJRenX+tiVbBgRtg qDouualJKx+3zWupUGxx0BmUjlF+ZN5iYV/xv79ZXE0YS8x5X0RgDWYvgbHrXDjO9R L8uabB8y75rNU7h/XzekN2LBdOTbggT6sd9MsFzJYptQlSnHyUqi0v8J7kEq7BWt4k WxeRvdVPCVsdE6TwFES1C82dBjosHiOw9foFfbti4ZI3aYw9AVpQLLpNHqo69+xcTo gjQItjhgdXang== 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 F3BD5C28B30; Wed, 26 Mar 2025 05:33:39 +0000 (UTC) From: Hermes Wu via B4 Relay Subject: [PATCH v2 0/5] drm/bridge: it6505: fix DP link traning and improve compatibility Date: Wed, 26 Mar 2025 13:34:12 +0800 Message-Id: <20250326-fix-link-training-v2-0-756c8306f500@ite.com.tw> 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: 7bit X-B4-Tracking: v=1; b=H4sIANSR42cC/x2MQQqAIBAAvxJ7bkFFBftKdIjabCm20IhA+nvSc WBmCmRKTBm6pkCimzMfUsG0DUzrKJGQ58pglHFKG40LP7izbHilkYUlovXaBmeD9c5B7c5EVfq f/fC+Hwia3E9jAAAA X-Change-ID: 20250121-fix-link-training-461495494655 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=1742967277; l=1323; i=Hermes.wu@ite.com.tw; s=20241230; h=from:subject:message-id; bh=oKGOdDgxhAqNZ5oSM5iv/OnF2CxCH6tBHGl2VSB8qc8=; b=82T34WmCkdjj6qSV8M4kPQjRl4ckK8npAAKkeembaXRcV/OIg3QCR0QAJk84CiH5zcAZGx/sb J4byaM9Mb6DBdb5KWK618gl/kTW7KBxDq/QAvZeg0xYHlDbedTFttC7 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 IT6505 supports HW auto link training which will write DPCD and check training status automatically. Some DP device can not pass HW auto link training and must set link training step by step. when HW auto link training fail, it may trigger video FIFO error, and link training process will reset to beginning, and never try step training method. Modify training method improve compatibility to these DP devices. v1 -> v2: 1. Split [PATCH 1/3] into 3 commits 2. Drop non necessary variable auto_ttrain_retry v1 link: https://lore.kernel.org/all/20250318-fix-link-training-v1-0-19266711142c@ite.com.tw/ Signed-off-by: Hermes Wu --- Hermes Wu (5): drm/bridge: it6505: fix link training state HW register reset drm/bridge: it6505: check INT_LINK_TRAIN_FAIL while link auto training drm/bridge: it6505: modify DP link auto training drm/bridge: it6505: modify DP link training work drm/bridge: it6505: skip auto training when previous try fail drivers/gpu/drm/bridge/ite-it6505.c | 112 +++++++++++++++++++++--------------- 1 file changed, 65 insertions(+), 47 deletions(-) --- base-commit: 938fbb16aba8f7b88e0fdcf56f315a5bbad41aad change-id: 20250121-fix-link-training-461495494655 Best regards, -- Hermes Wu