From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DAED0CA0ED3 for ; Wed, 4 Sep 2024 09:36:26 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5E7EF10E71A; Wed, 4 Sep 2024 09:36:25 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="ZWkIiVbC"; dkim-atps=neutral Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5D88010E71A for ; Wed, 4 Sep 2024 09:36:24 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id DDFE25C5683; Wed, 4 Sep 2024 09:36:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 50EBDC4CEC9; Wed, 4 Sep 2024 09:36:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725442582; bh=9bAhJ9CJLtRo5g7kUHeOsxrCvaYqEyomg7XrEVlcoI0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ZWkIiVbCKmH2u8CfkCeJrYGIdpLJbYj6kBpbhH/s8NG1I5YWKI721mj7Lzt43ELUr 4Y/RWuEqQecX+uHlVulZn5bFL26l4g7DDrh/CsAUjWAD/gkxjxo5Gw8nKZgA1qUFKP ddsnw1cBv9lkrSBYrj3fXi6N7cyMOaQBad+MHS0REatztT25RnzRjXgmy3fkdN4OYe YE9QqbovUWfEnjcCfdZioSRwdtlvWWN9GveHaApRiw2JDeW47I2by+BAeP5y4eFp0+ nCxYUhP9VZeZHBJi5/yvUHifdUDcB7+hi+9ptjKGG8X2eL9sPITVHfDH+5PiTH+K7a VUusR+s9t1Q4Q== Date: Wed, 4 Sep 2024 09:36:15 +0000 From: Tzung-Bi Shih To: Stephen Boyd Cc: chrome-platform@lists.linux.dev, linux-kernel@vger.kernel.org, patches@lists.linux.dev, devicetree@vger.kernel.org, Douglas Anderson , Pin-yen Lin , Andrzej Hajda , Benson Leung , Conor Dooley , Daniel Vetter , David Airlie , Dmitry Baryshkov , dri-devel@lists.freedesktop.org, Guenter Roeck , Jernej Skrabec , Jonas Karlman , Krzysztof Kozlowski , Laurent Pinchart , Lee Jones , Maarten Lankhorst , Maxime Ripard , Neil Armstrong , Prashant Malani , Robert Foss , Rob Herring , Thomas Zimmermann , Alexandre Belloni , Andy Shevchenko , Daniel Scally , Greg Kroah-Hartman , Heikki Krogerus , Ivan Orlov , linux-acpi@vger.kernel.org, linux-usb@vger.kernel.org, Mika Westerberg , "Rafael J . Wysocki" , Sakari Ailus , Vinod Koul Subject: Re: [PATCH v4 17/18] platform/chrome: cros_ec_typec: Support DP muxing Message-ID: References: <20240901040658.157425-1-swboyd@chromium.org> <20240901040658.157425-18-swboyd@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240901040658.157425-18-swboyd@chromium.org> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Sat, Aug 31, 2024 at 09:06:55PM -0700, Stephen Boyd wrote: > Most ARM based chromebooks with two usb-c-connector nodes and one DP > controller are muxing the DP lanes between the two USB ports. This is > done so that the type-c ports are at least equal in capability if not > functionality. Either an analog mux is used to steer the DP signal to > one or the other port, or a DP bridge chip has two lanes (e.g. DP > ML0/ML1) wired to one type-c port while the other two (e.g. DP ML2/ML3) > are wired to another type-c port. > > [...] > > Cc: Prashant Malani > Cc: Benson Leung > Cc: Tzung-Bi Shih > Cc: > Cc: Pin-yen Lin > Signed-off-by: Stephen Boyd Reviewed-by: Tzung-Bi Shih