Date:   Fri, 8 Jun 2018 10:17:23 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Hans Verkuil <hverkuil@...all.nl>, airlied@...ux.ie,
        hans.verkuil@...co.com, lee.jones@...aro.org, olof@...om.net,
        seanpaul@...gle.com
Cc:     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

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
for media to merge the mfd branch + patch 7 ?

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
>>
> 

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