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Subject: Re: [PATCH v7 0/6] Add ChromeOS EC CEC Support
To:     Neil Armstrong <narmstrong@baylibre.com>,
        Hans Verkuil <hverkuil@xs4all.nl>, airlied@linux.ie,
        hans.verkuil@cisco.com, lee.jones@linaro.org, olof@lixom.net,
        seanpaul@google.com
Cc:     sadolfsson@google.com, felixe@google.com, bleung@google.com,
        darekm@google.com, marcheu@chromium.org, fparent@baylibre.com,
        dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org,
        intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        eballetbo@gmail.com
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 <04598b47-5099-6695-da43-6e7148145cfa@xs4all.nl>
 <55c2c02d-5675-0821-97ec-6a805659b807@baylibre.com>
From:   Hans Verkuil <hansverk@cisco.com>
Message-ID: <898f025f-9c59-be61-a2b4-5fbbcbc659c2@cisco.com>
Date:   Fri, 8 Jun 2018 10:24:42 +0200
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On 08/06/18 10:17, Neil Armstrong wrote:
> Hi Hans,
> 
> 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.

Regards,

	Hans

> 
> Neil
> 
>>
>> Any opinions?
>>
>> Regards,
>>
>> 	Hans
>>
>>>
>>> Feel free to comment this patchset !
>>>
>>> Changes since v6:
>>> - Added stable identifier comment in intel_display.h
>>> - Renamed to cec_notifier in intel_hdmi.c/intel_drv.h
>>> - Added Acked-by/Reviewed-By tags
>>>
>>> Changes since v5:
>>>  - Small fixups on include/linux/mfd/cros_ec_commands.h
>>>  - Fixed on cros-ec-cec driver accordingly
>>>  - Added Reviewed-By tags
>>>
>>> Changes since v4:
>>>  - Split patch 3 to move the mkbp event size change into a separate patch
>>>
>>> Changes since v3 (incorrectly reported as v2):
>>>  - Renamed "Chrome OS" to "ChromeOS"
>>>  - Updated cros_ec_commands.h new structs definitions to kernel doc format
>>>  - Added Reviewed-By tags
>>>
>>> Changes since v2:
>>>  - Add i915 port_identifier() and use this stable name as cec_notifier conn name
>>>  - Fixed and cleaned up the CEC commands and events handling
>>>  - Rebased the CEC sub-device registration on top of Enric's serie
>>>  - Fixed comments typo on cec driver
>>>  - Protected the DMI match only with PCI and DMI Kconfigs
>>>
>>> Changes since v1:
>>>  - Added cec_notifier_put to intel_hdmi
>>>  - Fixed all small reported issues on the EC CEC driver
>>>  - Moved the cec_notifier_get out of the #if .. #else .. #endif
>>>
>>> Changes since RFC:
>>>  - Moved CEC sub-device registration after CEC commands and events definitions patch
>>>  - Removed get_notifier_get_byname
>>>  - Added CEC_CORE select into i915 Kconfig
>>>  - Removed CEC driver fallback if notifier is not configured on HW, added explicit warn
>>>  - Fixed CEC core return type on error
>>>  - Moved to cros-ec-cec media platform directory
>>>  - Use bus_find_device() to find the pci i915 device instead of get_notifier_get_byname()
>>>  - Fix Logical Address setup
>>>  - Added comment about HW support
>>>  - Removed memset of msg structures
>>>
>>> Neil Armstrong (6):
>>>   media: cec-notifier: Get notifier by device and connector name
>>>   drm/i915: hdmi: add CEC notifier to intel_hdmi
>>>   mfd: cros-ec: Increase maximum mkbp event size
>>>   mfd: cros-ec: Introduce CEC commands and events definitions.
>>>   mfd: cros_ec_dev: Add CEC sub-device registration
>>>   media: platform: Add ChromeOS EC CEC driver
>>>
>>>  drivers/gpu/drm/i915/Kconfig                     |   1 +
>>>  drivers/gpu/drm/i915/intel_display.h             |  24 ++
>>>  drivers/gpu/drm/i915/intel_drv.h                 |   2 +
>>>  drivers/gpu/drm/i915/intel_hdmi.c                |  13 +
>>>  drivers/media/cec/cec-notifier.c                 |  11 +-
>>>  drivers/media/platform/Kconfig                   |  11 +
>>>  drivers/media/platform/Makefile                  |   2 +
>>>  drivers/media/platform/cros-ec-cec/Makefile      |   1 +
>>>  drivers/media/platform/cros-ec-cec/cros-ec-cec.c | 347 +++++++++++++++++++++++
>>>  drivers/mfd/cros_ec_dev.c                        |  16 ++
>>>  drivers/platform/chrome/cros_ec_proto.c          |  40 ++-
>>>  include/linux/mfd/cros_ec.h                      |   2 +-
>>>  include/linux/mfd/cros_ec_commands.h             | 100 +++++++
>>>  include/media/cec-notifier.h                     |  27 +-
>>>  14 files changed, 581 insertions(+), 16 deletions(-)
>>>  create mode 100644 drivers/media/platform/cros-ec-cec/Makefile
>>>  create mode 100644 drivers/media/platform/cros-ec-cec/cros-ec-cec.c
>>>
>>
>