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 4AE79C433F5 for ; Tue, 1 Feb 2022 03:51:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233098AbiBADvp (ORCPT ); Mon, 31 Jan 2022 22:51:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51184 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232792AbiBADvn (ORCPT ); Mon, 31 Jan 2022 22:51:43 -0500 Received: from mail-ot1-x332.google.com (mail-ot1-x332.google.com [IPv6:2607:f8b0:4864:20::332]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 280D0C06173B for ; Mon, 31 Jan 2022 19:51:42 -0800 (PST) Received: by mail-ot1-x332.google.com with SMTP id w27-20020a9d5a9b000000b005a17d68ae89so14988207oth.12 for ; Mon, 31 Jan 2022 19:51:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=RwCJ9hsr7K8u4lScvyqLshgsHaCbHyGZzuvtWtgyQhk=; b=W/QeLuCExljnv+CgrUxbXAs3XEeKWZ8rl6XrNIq1eFyWpdrTb+tFCq3TopqOgLpk4m B0egCwsR8NYgiW3xtg8pT+VdahFhPJYh7zIOaB2oqy+B9/ac8BeN7pLfY5sKT2nc93aU 6jX0n3f4Z7rpaOFLQdVWswntJe2MvkaNK+vFyKYzhLFcwcbqoS056ui8qZrDju+3GZbe R1p/YAzPyXaBwcHwZApsp5Or+JeU7CNJ8WGt5XdSSMt/Ljp6MYAMtVkLJqeJZ2GXQJsC EL36wmFdryie/kaqRwmRZ1rzOAdo5jKBEJ9BS0w64YQFpRaEaB+bNQgbdPHK1DJPtF2W FFyA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=RwCJ9hsr7K8u4lScvyqLshgsHaCbHyGZzuvtWtgyQhk=; b=3Zhlr7H2spjjpscFSB6JcM3cF/8+MNKHxTZ0FFnUyuOimrUCQ+pzUNgRF7U//GWHv9 /vScxGQTkgyBQWC1hDeNCz3meEN7mqV3RmqwqIfmcyyAgQbeRNDnVTbXpRxQe7NUxSoO tSfHsJvEYjTaLf8dDuIGQuBYa0xunUPA74nCVRUK+9J6tbDfjbe6bxIVuHzwe7wlpHTH HuXBk1WwBJ/LD9lzkGbINQE6kYg2tUiqUmDEYeBI9iX5Xp1lv2j8R8IWiNw5cXbKYW2d /Ihsg6H34xNTqZ4+lFDNx+lpV1GlbcIQOoHscCL5z/saDGuX/FRvEvE33ktAhkvc/IY3 uv5w== X-Gm-Message-State: AOAM532j4XP7l/CUZZyP9TvpSn2Ew9BWlZXyfyQe6Hp9Or6lELketw/m F4oTgWhvcS54ilOPfTApk69+EA== X-Google-Smtp-Source: ABdhPJzlVbKkZvspjBMNPX/2jwwSYJ4UGETyWaSGL5Z6yUDRuLU1XIP91aNhSXJlSr73jp6k3OJsKw== X-Received: by 2002:a9d:d72:: with SMTP id 105mr13424096oti.340.1643687501469; Mon, 31 Jan 2022 19:51:41 -0800 (PST) Received: from ripper ([2600:1700:a0:3dc8:205:1bff:fec0:b9b3]) by smtp.gmail.com with ESMTPSA id y3sm16901825oix.41.2022.01.31.19.51.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Jan 2022 19:51:40 -0800 (PST) Date: Mon, 31 Jan 2022 19:52:00 -0800 From: Bjorn Andersson To: Kuogee Hsieh Cc: robdclark@gmail.com, sean@poorly.run, swboyd@chromium.org, vkoul@kernel.org, daniel@ffwll.ch, airlied@linux.ie, agross@kernel.org, dmitry.baryshkov@linaro.org, quic_abhinavk@quicinc.com, aravindh@codeaurora.org, freedreno@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] drm/msm/dp: add wide bus support Message-ID: References: <1643390945-10813-1-git-send-email-quic_khsieh@quicinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1643390945-10813-1-git-send-email-quic_khsieh@quicinc.com> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On Fri 28 Jan 09:29 PST 2022, Kuogee Hsieh wrote: > Normally, mdp will push one pixel of data per pixel clock to > interface to display. Wide bus feature will increase bus > width from 32 bits to 64 bits so that it can push two > pixel of data per pixel clock to interface to display. > This feature is pre requirement to support 4k resolution. > Can you please elaborate further how this is a requirement for 4k resolution, given that I write you this question on a 4k monitor. Regards, Bjorn 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 2A675C433F5 for ; Tue, 1 Feb 2022 03:51:45 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2AA8210E742; Tue, 1 Feb 2022 03:51:44 +0000 (UTC) Received: from mail-ot1-x333.google.com (mail-ot1-x333.google.com [IPv6:2607:f8b0:4864:20::333]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6CC8710E73F for ; Tue, 1 Feb 2022 03:51:42 +0000 (UTC) Received: by mail-ot1-x333.google.com with SMTP id l12-20020a0568302b0c00b005a4856ff4ceso6863683otv.13 for ; Mon, 31 Jan 2022 19:51:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=RwCJ9hsr7K8u4lScvyqLshgsHaCbHyGZzuvtWtgyQhk=; b=W/QeLuCExljnv+CgrUxbXAs3XEeKWZ8rl6XrNIq1eFyWpdrTb+tFCq3TopqOgLpk4m B0egCwsR8NYgiW3xtg8pT+VdahFhPJYh7zIOaB2oqy+B9/ac8BeN7pLfY5sKT2nc93aU 6jX0n3f4Z7rpaOFLQdVWswntJe2MvkaNK+vFyKYzhLFcwcbqoS056ui8qZrDju+3GZbe R1p/YAzPyXaBwcHwZApsp5Or+JeU7CNJ8WGt5XdSSMt/Ljp6MYAMtVkLJqeJZ2GXQJsC EL36wmFdryie/kaqRwmRZ1rzOAdo5jKBEJ9BS0w64YQFpRaEaB+bNQgbdPHK1DJPtF2W FFyA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=RwCJ9hsr7K8u4lScvyqLshgsHaCbHyGZzuvtWtgyQhk=; b=fPLisoDxErHCryLwrqaD+zQPz1qs92oqPSPWrPgbAQaTG1Mae5kM4MS1K1OM7GUSAh orGKvFAf6CqRZf1SrAl05/C5CjkyJ4BGFNAczxJapt7rJR68OKpMjJRN3VAsZIthQ8SY /8K2ei8CCfH12/kX0gPh+pytqDAnFW9iekWjLt0lLtxX3JXZrnTTLrDIsHGJF8BAmF75 rjspYiXSjcNYvrW7br6xQAEbsRQyZMz/wfO85d6TYFQ0GcNm7xYn9ZEJE5aqQ0YiQsKn 99Zsuvz3y27oPJGW+QbHRKh5Wvv2uHiPSzoezaSxpkwKWnZ4DInqOQpPAxr2NY33BQWq LgPg== X-Gm-Message-State: AOAM532/H8mmvTV7cm2UWxUMBlliHQO5qmwzV2gXwJtdhVcwPkjMV5UJ 4XlRhKsVp6OcGfsyrb04vZFqLg== X-Google-Smtp-Source: ABdhPJzlVbKkZvspjBMNPX/2jwwSYJ4UGETyWaSGL5Z6yUDRuLU1XIP91aNhSXJlSr73jp6k3OJsKw== X-Received: by 2002:a9d:d72:: with SMTP id 105mr13424096oti.340.1643687501469; Mon, 31 Jan 2022 19:51:41 -0800 (PST) Received: from ripper ([2600:1700:a0:3dc8:205:1bff:fec0:b9b3]) by smtp.gmail.com with ESMTPSA id y3sm16901825oix.41.2022.01.31.19.51.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Jan 2022 19:51:40 -0800 (PST) Date: Mon, 31 Jan 2022 19:52:00 -0800 From: Bjorn Andersson To: Kuogee Hsieh Subject: Re: [PATCH] drm/msm/dp: add wide bus support Message-ID: References: <1643390945-10813-1-git-send-email-quic_khsieh@quicinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1643390945-10813-1-git-send-email-quic_khsieh@quicinc.com> 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: , Cc: quic_abhinavk@quicinc.com, airlied@linux.ie, freedreno@lists.freedesktop.org, vkoul@kernel.org, dri-devel@lists.freedesktop.org, swboyd@chromium.org, agross@kernel.org, linux-arm-msm@vger.kernel.org, dmitry.baryshkov@linaro.org, aravindh@codeaurora.org, sean@poorly.run, linux-kernel@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Fri 28 Jan 09:29 PST 2022, Kuogee Hsieh wrote: > Normally, mdp will push one pixel of data per pixel clock to > interface to display. Wide bus feature will increase bus > width from 32 bits to 64 bits so that it can push two > pixel of data per pixel clock to interface to display. > This feature is pre requirement to support 4k resolution. > Can you please elaborate further how this is a requirement for 4k resolution, given that I write you this question on a 4k monitor. Regards, Bjorn