linux-kernel - Re: [PATCH 0/2] Associate ddc adapters with connectors

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Date:   Tue, 25 Jun 2019 16:20:31 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Daniel Vetter <daniel@...ll.ch>,
        Emil Velikov <emil.velikov@...labora.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Andrzej Pietrasiewicz <andrzej.p@...labora.com>,
        Inki Dae <inki.dae@...sung.com>,
        David Airlie <airlied@...ux.ie>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Kukjin Kim <kgene@...nel.org>, dri-devel@...ts.freedesktop.org,
        kernel@...labora.com, Sean Paul <sean@...rly.run>,
        linux-kernel@...r.kernel.org, m.szyprowski@...sung.com
Subject: Re: [PATCH 0/2] Associate ddc adapters with connectors

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