From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Vetter Subject: Re: [PATCH 0/2] Associate ddc adapters with connectors Date: Tue, 25 Jun 2019 16:20:31 +0200 Message-ID: <20190625142031.GV12905@phenom.ffwll.local> 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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20190625141032.5jiy2oekb3olaejd@shell.armlinux.org.uk> Sender: linux-kernel-owner@vger.kernel.org To: Russell King - ARM Linux admin Cc: Daniel Vetter , 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 , Andrzej Pietrasiewicz , 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 List-Id: linux-samsung-soc@vger.kernel.org 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 -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch