From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f51.google.com (mail-wm1-f51.google.com [209.85.128.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1583130C35B for ; Mon, 8 Sep 2025 14:07:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.51 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757340449; cv=none; b=eWHH3wcV3VtOUEYG3sHdTY8E6AH7OP+2jBCCCdWJ0ues6ThvWLavbI5Ez/TxFXi5/lYH5/hGGRkleOF4HEvIboXyWoopYuMd9mQ6GLN/UlzG8E0eDoefA7v3YMa9j33jTd6mY/eM7roGZmTAXiRP63nTpwgcvm04iRHGNZPNTMA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757340449; c=relaxed/simple; bh=M/Zgz6ach2ic8c+NvmOlMwm539QJY5Sta9cn1PQv0jE=; h=Message-ID:Date:MIME-Version:From:Subject:To:Cc:References: In-Reply-To:Content-Type; b=EkJZuQPk2qtGsziHW/eVLSPcnL0kUUNeO5FHD7cK6mxs88mn2TESarUOtkR0+an+3KtwDnvqWfj+1iwZ8ad7Byae1bfINJNRkfvcBlzdiLApNpzUdKXO32yR1M/Dkvm9K9YkPU4rPsBvV4+12WcFcHtQAvAycsaQfNVwtau0mcY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=SH4V4cn6; arc=none smtp.client-ip=209.85.128.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="SH4V4cn6" Received: by mail-wm1-f51.google.com with SMTP id 5b1f17b1804b1-45de287cc11so6945805e9.1 for ; Mon, 08 Sep 2025 07:07:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1757340445; x=1757945245; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:references:cc:to:subject:reply-to:from:user-agent :mime-version:date:message-id:from:to:cc:subject:date:message-id :reply-to; bh=Rdc/gAsQZ6uhaHdORjf30XQWPTkhf47P6Ih3PEktLz0=; b=SH4V4cn6yamzvi+IYG+21XfszvAz8xp8/pKIbn0q2pjQ4p6lxJWQLRdYxa47i/N+18 pWygTJ0NslYCuf0OwDudZ2GAK8l8Bp7PGdAcPv1v0k/3rJIIj0qiRdkGu88rcbMKTWTU 2LWwce4LfWwRAELVlPANp4D+ynEYXkbjZrB0+flnC8Ugiesz9VgapgJa0IDygWK8bNjf tO0sEzx2YZZlbVmLIOZWCZ7XS1xpHPeMo/nd6YDvLpZZuQ5mkUjyRrNcY+1Goq20qoIa PMHTQVawCKVC5A+q3ykhOGxCGWXmU2QDIIMsgbI2zDgSYxUwK7Yx8E7nU9HRlSRh8Dv6 ONPw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757340445; x=1757945245; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:references:cc:to:subject:reply-to:from:user-agent :mime-version:date:message-id:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=Rdc/gAsQZ6uhaHdORjf30XQWPTkhf47P6Ih3PEktLz0=; b=o7CbP/4e4NNdnXApIuYC2JB6K1N/9Ma2JOIMzJ6XDsuW1QPEq1V9mzQ/b/737JHzMc yGJNutCt7bGvkRgb5iNIb5r2LBS0IunS3sLN5XvUOddTbsNmc8rNVKk5iofaD3gIVHyR 8WpEu/JV5hhBaXLWWb94A6zfhblW69xNLD4MnAGSl9w+rydggInagH/ewT/UYL8JXLmP CbhvUmKg/s9k2ORZu6JXzPUb3yqq0Aqe/wFKlh+Q9iOW61QzuXkIO6DjzvnXPksvtt6l qqpV6JGBXrFivPUL0LwOn0n4dvhQZ2LCZge84Rb1Bbp1p+U7jBEA6Bd7705HkR7J16jq 5SyQ== X-Forwarded-Encrypted: i=1; AJvYcCXNXEg/sAziDgf3TBVKWjpx7r3Q3hx+w9NL0LqIzn5tHkfbppYIr2uI5WAupADP0rBb3HdSrrbrMGJqcZ4=@vger.kernel.org X-Gm-Message-State: AOJu0YxUP3dl3g6rLriPq23lJaL2DtW+1xjxVyVKi/eby45ykYYjOcTo ebjYQ4N5j4nMbJlAoKJamtZRKfTaULMLRp+wAjkPQz/eXT3A919pIH3wHCMcnLsv+W0= X-Gm-Gg: ASbGnctmTNz2vMkRKa82E29JO3XzskhtXwkW+1ltVAwW2UZ5ZiAcRIXTI4HuSbej85N JwBwOU/zDZtX/+i4sLnKN1Ik/798qG9la+KL6XF+KOqiJLje6h9uRaNyJwQ3E1vv/Ex3pS1fpsD vh1ycZUcyMrDBkOC3p9YRv1frK2CjLlYJRJjfC1BoCh2ma2C7dNWLAoIbcJd+t6QChT2HvAEBHS nV5sOXiAUsMSwGrqvpQAM/s0YlDR6f5HeRn5yF8rVkbKLH3R7ZCh2pHvL1GPsdjoQb4vYafUrSl i1cHpLXNT5hv1thpVjQex1rc7K1Mk7ecdFy1CZG3koQNVCI0Xrvm1GJh1rxQjl7QzRc4SgUs/B5 as3AgIZNYs+YYXEI8p1wJ8XhfAOSd1eaghR6CsUFgXD4PDIIv1nkct9pQicJv6wB4+fzNS4ydny 89+NRvkHEQGA== X-Google-Smtp-Source: AGHT+IFgaJMZWp+yGKsLkm2e55jSKRrdRQJMjkwsfeyTYzu9PP+AiFfrM1Y4iCzAOP2g1/eX7se7mQ== X-Received: by 2002:a05:600c:c0c5:b0:45d:e531:99df with SMTP id 5b1f17b1804b1-45de64869d9mr26259825e9.3.1757340443694; Mon, 08 Sep 2025 07:07:23 -0700 (PDT) Received: from ?IPV6:2a01:e0a:3d9:2080:61c1:5d31:4427:381b? ([2a01:e0a:3d9:2080:61c1:5d31:4427:381b]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45c6faad9cfsm266392505e9.0.2025.09.08.07.07.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Sep 2025 07:07:23 -0700 (PDT) Message-ID: Date: Mon, 8 Sep 2025 16:07:22 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: neil.armstrong@linaro.org Reply-To: Neil Armstrong Subject: Re: [PATCH v3 2/5] drm/bridge: simple: add Realtek RTD2171 DP-to-HDMI bridge To: Dmitry Baryshkov , Maud Spierings Cc: Laurent.pinchart@ideasonboard.com, airlied@gmail.com, andersson@kernel.org, andrzej.hajda@intel.com, conor+dt@kernel.org, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, jernej.skrabec@gmail.com, jonas@kwiboo.se, kishon@kernel.org, konradybcio@kernel.org, krzk+dt@kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, rfoss@kernel.org, robh@kernel.org, simona@ffwll.ch, tzimmermann@suse.de, vkoul@kernel.org References: <20250908-topic-x1e80100-hdmi-v3-2-c53b0f2bc2fb@linaro.org> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi, On 08/09/2025 15:45, Dmitry Baryshkov wrote: > On Mon, Sep 08, 2025 at 03:35:23PM +0200, Maud Spierings wrote: >> Hello Neil, >> >>> Add support for the transparent Realtek RTD2171 DP-to-HDMI bridge. >>> >>> Reviewed-by: Dmitry Baryshkov >>> Signed-off-by: Neil Armstrong >>> --- >>> drivers/gpu/drm/bridge/simple-bridge.c | 5 +++++ >>> 1 file changed, 5 insertions(+) >>> >>> diff --git a/drivers/gpu/drm/bridge/simple-bridge.c b/drivers/gpu/drm/bridge/simple-bridge.c >>> index 1f16d568bcc4e0fb56c763244389e6fecbcb2231..e4d0bc2200f8632bcc883102c89c270a17c68d0c 100644 >>> --- a/drivers/gpu/drm/bridge/simple-bridge.c >>> +++ b/drivers/gpu/drm/bridge/simple-bridge.c >>> @@ -266,6 +266,11 @@ static const struct of_device_id simple_bridge_match[] = { >>> .data = &(const struct simple_bridge_info) { >>> .connector_type = DRM_MODE_CONNECTOR_HDMIA, >>> }, >>> + }, { >>> + .compatible = "realtek,rtd2171", >>> + .data = &(const struct simple_bridge_info) { >>> + .connector_type = DRM_MODE_CONNECTOR_HDMIA, >>> + }, >>> }, { >>> .compatible = "ti,opa362", >>> .data = &(const struct simple_bridge_info) { >>> >>> -- >>> 2.34.1 >> >> I would like to ask again if it may not be a better idea to introduce a >> fallback compatible, once this patchseries lands I will be adding the > > I'd say, that's not a good idea. We usually don't have fully datasheets > for those bridges, so we can't be sure that there are no strapping pins > / other GPIO controls. > >> parade,ps185hdm. I don't know how many other variants there are that are >> just simple dp->hdmi bridges that don't require anything other than the >> connector type set to HDMIA. The Thinkbook 16 and zenbook a14 both have HDMI >> connectors, likely with simple bridges too. Sorry for the late reply, yes I have the same position, they are simple bridge until we found out it's not the case... Neil >> >> Kind regards, >> Maud >