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 X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=BAYES_00,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 782F4C433E0 for ; Fri, 26 Mar 2021 00:09:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4461561A44 for ; Fri, 26 Mar 2021 00:09:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230221AbhCZAJX (ORCPT ); Thu, 25 Mar 2021 20:09:23 -0400 Received: from mail-il1-f174.google.com ([209.85.166.174]:41498 "EHLO mail-il1-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229854AbhCZAJM (ORCPT ); Thu, 25 Mar 2021 20:09:12 -0400 Received: by mail-il1-f174.google.com with SMTP id r8so3646357ilo.8; Thu, 25 Mar 2021 17:09:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=a11hWINvZadDTUc1x1p5mvJKc6CEu6ZdeGypWrdKiFU=; b=tzGOkg2CaGCTcKWWsaoRRj9XUFHwBfgkDL6O51xSFlzcdW9KykGUdslmKGswt+9wxu Q9Kmz5dCug1mW0OjYI6AM1ayJu4ivbjDj+WGyAjR7xPzgwROMxJ182LtotuPfEa+ccn2 APJys/lIzUGe49uIZdxV21ard3ZI52icYqK3QyH2JHqsAE0QXO8jFJvDC6ivc0XogYXn omiZxrtri25o/AE/pif+cxnC8G1TEcR2figZsoS5a7WuAxA0uTq6llStnEhOYEeLM5jO 7t5Dskzh2owOiz94mtmK0WzH26jQ/qJjgnSAc/fjY1uEtFoQRnxDMA6BhX8blxnVSvja L26w== X-Gm-Message-State: AOAM532UYVPSq9n3CRt3n6c9FcL9nI8gcm4rqWf4aYLSDpRMvxifZg8p k5YjJVZtHyWJqV2waRxdbA== X-Google-Smtp-Source: ABdhPJzpAml0C5TSFU9R4CKJ+PFO/N5I4vdC0tlV9SBzBs50molUg1khoXURpZiOCFbTEj49M4Tgow== X-Received: by 2002:a92:c545:: with SMTP id a5mr7599351ilj.209.1616717351425; Thu, 25 Mar 2021 17:09:11 -0700 (PDT) Received: from robh.at.kernel.org ([64.188.179.253]) by smtp.gmail.com with ESMTPSA id f13sm3377606ila.51.2021.03.25.17.09.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Mar 2021 17:09:09 -0700 (PDT) Received: (nullmailer pid 2001388 invoked by uid 1000); Fri, 26 Mar 2021 00:09:07 -0000 Date: Thu, 25 Mar 2021 18:09:07 -0600 From: Rob Herring To: Douglas Anderson Cc: Bjorn Andersson , Thierry Reding , Sam Ravnborg , robdclark@chromium.org, Daniel Vetter , dri-devel@lists.freedesktop.org, David Airlie , devicetree@vger.kernel.org, swboyd@chromium.org, linux-arm-msm@vger.kernel.org, Steev Klimaszewski , eballetbo@gmail.com, Andy Gross , Linus Walleij , drinkcat@chromium.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 1/3] dt-bindings: display: simple: Add the panel on sc7180-trogdor-pompom Message-ID: <20210326000907.GA1965415@robh.at.kernel.org> References: <20210316140707.RFC.1.I3a21995726282f1e9fcb70da5eb96f19ed96634f@changeid> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210316140707.RFC.1.I3a21995726282f1e9fcb70da5eb96f19ed96634f@changeid> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On Tue, Mar 16, 2021 at 02:08:19PM -0700, Douglas Anderson wrote: > The sc7180-trogdor-pompom board might be attached to any number of a > pile of eDP panels. At the moment I'm told that the list might include: > - KD KD116N21-30NV-A010 > - KD KD116N09-30NH-A016 > - Starry 2081116HHD028001-51D > - Sharp LQ116M1JW10 > > It should be noted that while the EDID programmed in the first 3 > panels indicates that they should run with exactly the same timing (to > keep things simple), the 4th panel not only needs different timing but > has a different resolution. > > As is true in general with eDP panels, we can figure out which panel > we have and all the info needed to drive its pixel clock by reading > the EDID. However, we can do this only after we've powered the panel > on. Powering on the panels requires following the timing diagram in > each panel's datasheet which specifies delays between certain > actions. This means that, while we can be quite dynamic about handling > things we can't just totally skip out on describing the panel like we > could do if it was connected to an external-facing DP port. Is this a 'standard' eDP connector? AFAICT, there does seem to be such a thing. I've said in the past I'd be okay with a edp-connector node. If that needs just the "HPD absent delay" property, I think that would be okay. It's just a never ending stream of new properties with each new panel that I don't want to see. Rob 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 X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=BAYES_00,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 460CBC433C1 for ; Fri, 26 Mar 2021 00:09:13 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 107986193F for ; Fri, 26 Mar 2021 00:09:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 107986193F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 89B996EE83; Fri, 26 Mar 2021 00:09:12 +0000 (UTC) Received: from mail-il1-f176.google.com (mail-il1-f176.google.com [209.85.166.176]) by gabe.freedesktop.org (Postfix) with ESMTPS id 180E16EE67 for ; Fri, 26 Mar 2021 00:09:12 +0000 (UTC) Received: by mail-il1-f176.google.com with SMTP id 19so3674817ilj.2 for ; Thu, 25 Mar 2021 17:09:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=a11hWINvZadDTUc1x1p5mvJKc6CEu6ZdeGypWrdKiFU=; b=W2T5sI7WLIl/WbJJRKJb3dslCqgDNWeQGbBXkezqEP14Qpbm0TULAav+J5HGuxucYN hvB5u/K7vfH+8P39PVjY9/Ply6oof8/lPbCIFNFBPaQRtjhYPAjJpDaQlCHPgKZwQE6B vqvBHr1ybH9yA6/2rm34u+MJHOe9LhcnHC5eAmOGn6kRawLOITmAcXnQhTpFTvnvNsts 4lg9RbtmX0eQXE2G5sR7EnnV5P231giwSTXwqAtDl69EZWQ8v9GZMcGL7Vh7nb96l5oK rb7Jak+22B5RPA6TelPysZxzciHBnCJ1ZuXmMDM3uP7039a9EerqQ90FcRKgzgXZifUc iepA== X-Gm-Message-State: AOAM530yuRaP/gPVAbD9ui3zw5iB3RcdIbymQ+D5q3iYBE+LlPBaBbu5 U2f6VDSpW5MNzyY6VEKA0w== X-Google-Smtp-Source: ABdhPJzpAml0C5TSFU9R4CKJ+PFO/N5I4vdC0tlV9SBzBs50molUg1khoXURpZiOCFbTEj49M4Tgow== X-Received: by 2002:a92:c545:: with SMTP id a5mr7599351ilj.209.1616717351425; Thu, 25 Mar 2021 17:09:11 -0700 (PDT) Received: from robh.at.kernel.org ([64.188.179.253]) by smtp.gmail.com with ESMTPSA id f13sm3377606ila.51.2021.03.25.17.09.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Mar 2021 17:09:09 -0700 (PDT) Received: (nullmailer pid 2001388 invoked by uid 1000); Fri, 26 Mar 2021 00:09:07 -0000 Date: Thu, 25 Mar 2021 18:09:07 -0600 From: Rob Herring To: Douglas Anderson Subject: Re: [RFC PATCH 1/3] dt-bindings: display: simple: Add the panel on sc7180-trogdor-pompom Message-ID: <20210326000907.GA1965415@robh.at.kernel.org> References: <20210316140707.RFC.1.I3a21995726282f1e9fcb70da5eb96f19ed96634f@changeid> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210316140707.RFC.1.I3a21995726282f1e9fcb70da5eb96f19ed96634f@changeid> 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: robdclark@chromium.org, devicetree@vger.kernel.org, drinkcat@chromium.org, David Airlie , linux-arm-msm@vger.kernel.org, Andy Gross , dri-devel@lists.freedesktop.org, Bjorn Andersson , Thierry Reding , Steev Klimaszewski , swboyd@chromium.org, Sam Ravnborg , linux-kernel@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Tue, Mar 16, 2021 at 02:08:19PM -0700, Douglas Anderson wrote: > The sc7180-trogdor-pompom board might be attached to any number of a > pile of eDP panels. At the moment I'm told that the list might include: > - KD KD116N21-30NV-A010 > - KD KD116N09-30NH-A016 > - Starry 2081116HHD028001-51D > - Sharp LQ116M1JW10 > > It should be noted that while the EDID programmed in the first 3 > panels indicates that they should run with exactly the same timing (to > keep things simple), the 4th panel not only needs different timing but > has a different resolution. > > As is true in general with eDP panels, we can figure out which panel > we have and all the info needed to drive its pixel clock by reading > the EDID. However, we can do this only after we've powered the panel > on. Powering on the panels requires following the timing diagram in > each panel's datasheet which specifies delays between certain > actions. This means that, while we can be quite dynamic about handling > things we can't just totally skip out on describing the panel like we > could do if it was connected to an external-facing DP port. Is this a 'standard' eDP connector? AFAICT, there does seem to be such a thing. I've said in the past I'd be okay with a edp-connector node. If that needs just the "HPD absent delay" property, I think that would be okay. It's just a never ending stream of new properties with each new panel that I don't want to see. Rob _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel