From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 B837B23C512; Tue, 16 Jun 2026 03:54:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781582089; cv=none; b=jseAAJIJtG0QnW+7kSVGEiZizcon3ivw57/eh9dhccMTYynL+PLhnIJP/NY4TduEjAujXkomrvT6jAU74RXcPTeEPdW4MsV1EgQ0EkX2ngu5oWsee9V3l4lHYo3N7VJqNa9VLA5JQnhLnwcTbmVnoQrdN8L9zJwyfKe5Qf4EfhE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781582089; c=relaxed/simple; bh=yg4Rq+cSTNIEK6m7DPyaWon6dl/EQaFfnw1dYCDVk44=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=hl/GcRwxbbuJpREFO2RsL8yTos5HI4vZe1tKGLZJwGSkR9imBFjcSJ5phJZKRQfqLURfuweYpeNgNEKB4sf/NVBGvRzclPooxRvdwUVHWuomAadBdmpX7xWfv4VozURfAAMcLwCng2lpUmIB9JXzYMEPRIblcadj/Jb6xWCTfBI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LgLP9GYG; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LgLP9GYG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22DB01F000E9; Tue, 16 Jun 2026 03:54:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781582087; bh=O6+MhKBljXTADXMRHGYmsysW/Fy0JHz9fMonKhiQAs8=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=LgLP9GYG5msyhqKX6xfKPkqjMuVIe/21XIybkoqjixezaGc7NnTHSkGR9hGjbyYJg PWIjNkqxVdufoENYBEgOfX8JZu1BYjxK1lVB/UQyNqqH/ewwVmt3bDOc0kqWhq2gXV FHIzEEVGhNyJ/HDZ9dxujdLGc537AvpsJw9OJaiZo1aPC580+hugLngJpHzqRmKFgI 1CHaAPIoTabqoz80hE158sj+3xeR7tTHVRm7UEQbS6ktyJkp4w3aPQi2NocrqEVXgc Gf+/fHZQ8uKZjIl2BYMfrdbuq36V/xAzHlHoYk6HmT9Ke7dfCOwFuxp7sdaGRWOwog 4xrxlBoFDBs2w== Message-ID: Date: Tue, 16 Jun 2026 05:54:38 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 1/2] dt-bindings: ufs: Document static TX Equalization settings properties To: Can Guo , bvanassche@acm.org, beanhuo@micron.com, peter.wang@mediatek.com, martin.petersen@oracle.com, mani@kernel.org Cc: linux-scsi@vger.kernel.org, Alim Akhtar , Avri Altman , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Ram Kumar Dwivedi , Zhaoming Luo , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , open list References: <20260615132834.2985346-1-can.guo@oss.qualcomm.com> <20260615132834.2985346-2-can.guo@oss.qualcomm.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 15/06/2026 15:28, Can Guo wrote: > UFS v5.0/UFSHCI v5.0 adds HS-G6 support (46.6 Gbps/lane) via UniPro > v3.0 and M-PHY v6.0. These specs define TX Equalization for all > High-Speed Gears (not only HS-G6) to compensate channel loss and > improve signal integrity at high speed. > > For HS-G6, M-PHY uses PAM4 1b1b line coding. Pre-Coding may also be > required depending on channel characteristics. > > Document vendor-neutral properties in ufs-common.yaml: > - txeq-preshoot-g[1-6] > - txeq-deemphasis-g[1-6] > - tx-precode-enable-g6 > > Values are per-lane Host/Device tuples (2 values for x1, 4 values for > x2). PreShoot/DeEmphasis range from 0..7, and Precode is 0/1. > > These are board-specific signal-integrity tuning values. They depend on > channel SI/PHY characterization and validation (host PHY, device PHY, > package, and board routing), and are determined by HW/PHY designers. > > Although UFSHCI v5.0 supports TX Equalization Training via UniPro v3.0, > which allows host software to determine optimal TX Equalization at > runtime, static board-specific TX Equalization settings in the Device > Tree are still necessary because: > - TX Equalization Training is not supported for HS-G3 and below > - TX Equalization Training is disabled on some platforms > > Signed-off-by: Can Guo > --- > .../devicetree/bindings/ufs/ufs-common.yaml | 58 +++++++++++++++++++ > 1 file changed, 58 insertions(+) Reviewed-by: Krzysztof Kozlowski Best regards, Krzysztof