linux-kernel - Re: [PATCH v7 0/6] Add ChromeOS EC CEC Support

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Date:   Mon, 11 Jun 2018 07:03:08 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Hans Verkuil <hansverk@...co.com>
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        Hans Verkuil <hverkuil@...all.nl>, airlied@...ux.ie,
        hans.verkuil@...co.com, olof@...om.net, seanpaul@...gle.com,
        sadolfsson@...gle.com, felixe@...gle.com, bleung@...gle.com,
        darekm@...gle.com, marcheu@...omium.org, fparent@...libre.com,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        eballetbo@...il.com
Subject: Re: [PATCH v7 0/6] Add ChromeOS EC CEC Support

On Fri, 08 Jun 2018, Hans Verkuil wrote:
> On 08/06/18 10:17, Neil Armstrong wrote:
> > On 08/06/2018 09:53, Hans Verkuil wrote:
> >> On 06/01/2018 10:19 AM, Neil Armstrong wrote:
> >>> Hi All,
> >>>
> >>> The new Google "Fizz" Intel-based ChromeOS device is gaining CEC support
> >>> through it's Embedded Controller, to enable the Linux CEC Core to communicate
> >>> with it and get the CEC Physical Address from the correct HDMI Connector, the
> >>> following must be added/changed:
> >>> - Add the CEC sub-device registration in the ChromeOS EC MFD Driver
> >>> - Add the CEC related commands and events definitions into the EC MFD driver
> >>> - Add a way to get a CEC notifier with it's (optional) connector name
> >>> - Add the CEC notifier to the i915 HDMI driver
> >>> - Add the proper ChromeOS EC CEC Driver
> >>>
> >>> The CEC notifier with the connector name is the tricky point, since even on
> >>> Device-Tree platforms, there is no way to distinguish between multiple HDMI
> >>> connectors from the same DRM driver. The solution I implemented is pretty
> >>> simple and only adds an optional connector name to eventually distinguish
> >>> an HDMI connector notifier from another if they share the same device.
> >>
> >> This looks good to me, which brings me to the next question: how to merge
> >> this?
> >>
> >> It touches on three subsystems (media, drm, mfd), so that makes this
> >> tricky.
> >>
> >> I think there are two options: either the whole series goes through the
> >> media tree, or patches 1+2 go through drm and 3-6 through media. If there
> >> is a high chance of conflicts in the mfd code, then it is also an option to
> >> have patches 3-6 go through the mfd subsystem.
> > 
> > I think patches 3-6 should go in the mfd tree, Lee is used to handle this,
> > then I think the rest could go in the media tree.
> > 
> > Lee, do you think it would be possible to have an immutable branch with patches 3-6 ?
> > 
> > Could we have an immutable branch from media tree with patch 1 to be merged in
> > the i915 tree for patch 2 ?
> > 
> > Or patch 1+2 could me merged into the i915 tree and generate an immutable branch
> 
> I think patches 1+2 can just go to the i915 tree. The i915 driver changes often,
> so going through that tree makes sense. The cec-notifier code is unlikely to change,
> and I am fine with that patch going through i915.
> 
> > for media to merge the mfd branch + patch 7 ?
> 
> Patch 7? I only count 6?
> 
> If 1+2 go through drm and 3-6 go through mfd, then media isn't affected at all.
> There is chance of a conflict when this is eventually pushed to mainline for
> the media Kconfig, but that's all.

What are the *build* dependencies within the set?

I'd be happy to send out a pull-request for either all of the patches,
or just the MFD changes once I've had chance to review them.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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