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=-0.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY autolearn=ham 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 19ED5C4646B for ; Wed, 26 Jun 2019 06:50:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E00D120665 for ; Wed, 26 Jun 2019 06:50:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726830AbfFZGuw (ORCPT ); Wed, 26 Jun 2019 02:50:52 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:34672 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725954AbfFZGuw (ORCPT ); Wed, 26 Jun 2019 02:50:52 -0400 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: andrzej.p) with ESMTPSA id 2DC2D285638 Subject: Re: [PATCH 0/2] Associate ddc adapters with connectors To: Russell King - ARM Linux admin , Emil Velikov , linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, Joonyoung Shim , Maxime Ripard , Maarten Lankhorst , Seung-Woo Kim , Krzysztof Kozlowski , Inki Dae , David Airlie , Kyungmin Park , Kukjin Kim , dri-devel@lists.freedesktop.org, kernel@collabora.com, Sean Paul , linux-kernel@vger.kernel.org, m.szyprowski@samsung.com References: <20190625100351.52ddptvb2gizaepi@shell.armlinux.org.uk> <817ccfba-754c-6a28-8d75-63f70605fd43@collabora.com> <20190625133639.GA16031@arch-x1c3> <20190625140755.GT12905@phenom.ffwll.local> <20190625141032.5jiy2oekb3olaejd@shell.armlinux.org.uk> <20190625142031.GV12905@phenom.ffwll.local> From: Andrzej Pietrasiewicz Message-ID: <3fb19371-db7d-f9dc-31a7-1ccd126f6784@collabora.com> Date: Wed, 26 Jun 2019 08:50:47 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.1 MIME-Version: 1.0 In-Reply-To: <20190625142031.GV12905@phenom.ffwll.local> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org W dniu 25.06.2019 o 16:20, Daniel Vetter pisze: > On Tue, Jun 25, 2019 at 03:10:32PM +0100, Russell King - ARM Linux admin wrote: >> On Tue, Jun 25, 2019 at 04:07:55PM +0200, Daniel Vetter wrote: >>> Otherwise I like this. Biggest problem I'm seeing here is rolling this out >>> everywhere, this is a lot of work. And without widespread adoptions it's >>> not terribly useful for userspace. >> >> There will be cases where it's not possible, because the I2C bus is >> hidden behind a chip that doesn't give you direct access to the DDC >> bus. > > Oh sure, plus lots of connectors where there's just not ddc bus at all. > But if we only roll this out for a handful of drivers it's also not great, > that's what I meant. Looking at > > $ git grep drm_do_get_edid > > there's only very few drivers where the ddc bus is hidden. There's a lot > more where it's not, and I think a big series to tackle those would serve > extremely well to make a case for this sysfs link. > -Daniel > I will respond with a v3 then, including as many drivers as possible. Those will be compile-tested only, though. Andrzej