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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C2043C43334 for ; Fri, 22 Jul 2022 16:16:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233965AbiGVQQs (ORCPT ); Fri, 22 Jul 2022 12:16:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49252 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229593AbiGVQQs (ORCPT ); Fri, 22 Jul 2022 12:16:48 -0400 Received: from fllv0016.ext.ti.com (fllv0016.ext.ti.com [198.47.19.142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 86B06FD4; Fri, 22 Jul 2022 09:16:46 -0700 (PDT) Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id 26MGGL52061918; Fri, 22 Jul 2022 11:16:21 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1658506582; bh=08PwfHBp1fRyc02qP294VlTMgUbHFS8jzINDzdDZnxc=; h=Date:From:To:CC:Subject:References:In-Reply-To; b=DyD146mnXS6SnL91b4jDyoEvMxap92DghfdyWRa6UQTDYylbwrmLImf1YJomfvkAn DDWy1vsLJy0v4AlFCzxd8lglpHv9ZQ2Rg/MENCCKDbGnlrPEaKTHBbtp3W5YOlcf3l IzwGK/3a90lphq6ZflVziQzQhEhTgJz1A92HuKLc= Received: from DLEE114.ent.ti.com (dlee114.ent.ti.com [157.170.170.25]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 26MGGL7N018124 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 22 Jul 2022 11:16:21 -0500 Received: from DLEE100.ent.ti.com (157.170.170.30) by DLEE114.ent.ti.com (157.170.170.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14; Fri, 22 Jul 2022 11:16:21 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DLEE100.ent.ti.com (157.170.170.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14 via Frontend Transport; Fri, 22 Jul 2022 11:16:21 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 26MGGLwu121736; Fri, 22 Jul 2022 11:16:21 -0500 Date: Fri, 22 Jul 2022 11:16:21 -0500 From: Nishanth Menon To: Rob Herring CC: Aradhya Bhatia , Tomi Valkeinen , Jyri Sarha , David Airlie , Daniel Vetter , Krzysztof Kozlowski , Darren Etheridge , Vignesh Raghavendra , Rahul T R , Krunal Bhargav , Devarsh Thakkar , DRI Development List , Devicetree List , Linux Kernel List Subject: Re: [PATCH 1/8] dt-bindings: display: ti,am65x-dss: Add port properties for DSS Message-ID: <20220722161621.p35apy5mstpgqhef@reverence> References: <20220719080845.22122-1-a-bhatia1@ti.com> <20220719080845.22122-2-a-bhatia1@ti.com> <20220720232845.GA4164694-robh@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20220720232845.GA4164694-robh@kernel.org> User-Agent: NeoMutt/20171215 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On 17:28-20220720, Rob Herring wrote: > > On the bridge side R0->R2, G0->G1, B0->B2 would be tied to ground. > > The bridge sees 24bits of data, but the lsb's are always zero. > > Unless the bridge ignores the LSBs, that's not the right way to do 16 to > 24 bit. The LSBs should be connected to the MSB of the color component > to get full color range. I unfortunately cannot point specifics without violating NDAs, so will just give a broad perspective. Correct, this is not ideal, but in certain scenarios with limited pins (due to iovoltage groups), we are indeed starting to see this kind of usage model starting to pop up. Tradeoff is in a limit on image quality, but that tends to be acceptable in certain lower cost solutions. -- Regards, Nishanth Menon Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3 1A34 DDB5 849D 1736 249D