linux-kernel - Re: [PATCH v7 0/9] drm: cec: convert DRM drivers to the new notifier API

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Message-ID: <6ef361f6-2f56-32ea-c7da-52799990cac7@xs4all.nl>
Date:   Mon, 19 Aug 2019 16:55:28 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Neil Armstrong <narmstrong@...libre.com>,
        Dariusz Marcinkiewicz <darekm@...gle.com>,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org
Cc:     Kate Stewart <kstewart@...uxfoundation.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Hans Verkuil <hverkuil@...all.nl>,
        Dhinakaran Pandiyan <dhinakaran.pandiyan@...el.com>,
        Sam Ravnborg <sam@...nborg.org>,
        linux-samsung-soc@...r.kernel.org,
        David Francis <David.Francis@....com>,
        amd-gfx@...ts.freedesktop.org, Leo Li <sunpeng.li@....com>,
        "Jerry (Fangzhi) Zuo" <Jerry.Zuo@....com>,
        linux-arm-kernel@...ts.infradead.org,
        nouveau@...ts.freedesktop.org, Jonas Karlman <jonas@...boo.se>,
        Jani Nikula <jani.nikula@...el.com>,
        intel-gfx@...ts.freedesktop.org,
        Russell King <rmk+kernel@...linux.org.uk>,
        Sean Paul <seanpaul@...omium.org>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        linux-tegra@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        Thomas Lim <Thomas.Lim@....com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Douglas Anderson <dianders@...omium.org>,
        linux-kernel@...r.kernel.org,
        Manasi Navare <manasi.d.navare@...el.com>,
        Alex Deucher <alexander.deucher@....com>,
        Colin Ian King <colin.king@...onical.com>,
        Enrico Weigelt <info@...ux.net>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v7 0/9] drm: cec: convert DRM drivers to the new notifier
 API

On 8/19/19 4:48 PM, Neil Armstrong wrote:
> Hi Dariusz, Hans,
> 
> I can apply the dw-hdmi patches if necessary.

I'd appreciate it if you can do that.

Thanks,

	Hans

> 
> Neil
> 
> On 19/08/2019 11:38, Hans Verkuil wrote:
>> Hi all,
>>
>> The patches in this series can be applied independently from each other.
>>
>> If you maintain one of these drivers and you want to merge it for v5.4
>> yourself, then please do so and let me know. If you prefer I commit it
>> to drm-misc, then please review and (hopefully) Ack the patch.
>>
>> I would really like to get this in for v5.4 so I can get the userspace
>> bits in for v5.4 as well through the media subsystem.
>>
>> Dariusz, can you post a v7.1 for patch 5/9 fixing the typo?
>>
>> Thanks!
>>
>> 	Hans
>>
>> On 8/14/19 12:44 PM, Dariusz Marcinkiewicz wrote:
>>> This series updates DRM drivers to use new CEC notifier API.
>>>
>>> Changes since v6:
>>> 	Made CEC notifiers' registration and de-registration symmetric
>>> 	in tda998x and dw-hdmi drivers. Also, accidentally dropped one
>>> 	patch in v6 (change to drm_dp_cec), brought it back now.
>>> Changes since v5:
>>>         Fixed a warning about a missing comment for a new member of
>>> 	drm_dp_aux_cec struct. Sending to a wider audience,
>>> 	including maintainers of respective drivers.
>>> Changes since v4:
>>> 	Addressing review comments.
>>> Changes since v3:
>>>         Updated adapter flags in dw-hdmi-cec.
>>> Changes since v2:
>>> 	Include all DRM patches from "cec: improve notifier support,
>>> 	add connector info connector info" series.
>>> Changes since v1:
>>> 	Those patches delay creation of notifiers until respective
>>> 	connectors are constructed. It seems that those patches, for a
>>> 	couple of drivers, by adding the delay, introduce a race between
>>> 	notifiers' creation and the IRQs handling threads - at least I
>>> 	don't see anything obvious in there that would explicitly forbid
>>> 	such races to occur. v2 adds a write barrier to make sure IRQ
>>> 	threads see the notifier once it is created (replacing the
>>> 	WRITE_ONCE I put in v1). The best thing to do here, I believe,
>>> 	would be not to have any synchronization and make sure that an IRQ
>>> 	only gets enabled after the notifier is created.
>>> Dariusz Marcinkiewicz (9):
>>>   drm_dp_cec: add connector info support.
>>>   drm/i915/intel_hdmi: use cec_notifier_conn_(un)register
>>>   dw-hdmi-cec: use cec_notifier_cec_adap_(un)register
>>>   tda9950: use cec_notifier_cec_adap_(un)register
>>>   drm: tda998x: use cec_notifier_conn_(un)register
>>>   drm: sti: use cec_notifier_conn_(un)register
>>>   drm: tegra: use cec_notifier_conn_(un)register
>>>   drm: dw-hdmi: use cec_notifier_conn_(un)register
>>>   drm: exynos: exynos_hdmi: use cec_notifier_conn_(un)register
>>>
>>>  .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |  2 +-
>>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c | 13 +++---
>>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 46 +++++++++++++------
>>>  drivers/gpu/drm/drm_dp_cec.c                  | 25 ++++++----
>>>  drivers/gpu/drm/exynos/exynos_hdmi.c          | 31 +++++++------
>>>  drivers/gpu/drm/i2c/tda9950.c                 | 12 ++---
>>>  drivers/gpu/drm/i2c/tda998x_drv.c             | 36 ++++++++++-----
>>>  drivers/gpu/drm/i915/display/intel_dp.c       |  4 +-
>>>  drivers/gpu/drm/i915/display/intel_hdmi.c     | 13 ++++--
>>>  drivers/gpu/drm/nouveau/nouveau_connector.c   |  3 +-
>>>  drivers/gpu/drm/sti/sti_hdmi.c                | 19 +++++---
>>>  drivers/gpu/drm/tegra/output.c                | 28 ++++++++---
>>>  include/drm/drm_dp_helper.h                   | 17 ++++---
>>>  13 files changed, 155 insertions(+), 94 deletions(-)
>>>
>>
>