linux-kernel - Re: [PATCH 0/4] drm/bridge: dw-hdmi: Add support for HDR metadata

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Message-ID: <37de5e40-38af-0bb5-88c0-dec1ad1c5d30@samsung.com>
Date:   Mon, 24 Jun 2019 17:27:55 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     Jonas Karlman <jonas@...boo.se>,
        "jernej.skrabec@...l.net" <jernej.skrabec@...l.net>,
        "maxime.ripard@...tlin.com" <maxime.ripard@...tlin.com>,
        Daniel Vetter <daniel@...ll.ch>,
        "khilman@...libre.com" <khilman@...libre.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "wens@...e.org" <wens@...e.org>,
        "zhengyang@...k-chips.com" <zhengyang@...k-chips.com>
Subject: Re: [PATCH 0/4] drm/bridge: dw-hdmi: Add support for HDR metadata

On 24.06.2019 13:16, Laurent Pinchart wrote:
> Hi Neil,
>
> On Mon, Jun 24, 2019 at 10:19:34AM +0200, Neil Armstrong wrote:
>> Hi Daniel, Laurent, Andrzej,
>>
>> On 24/06/2019 01:30, Laurent Pinchart wrote:
>>> On Fri, Jun 21, 2019 at 11:01:25AM +0200, Daniel Vetter wrote:
>>>> On Thu, Jun 20, 2019 at 04:40:12PM +0200, Neil Armstrong wrote:
>>>>> Hi Andrzej,
>>>>>
>>>>> Gentle ping, could you review the dw-hdmi changes here ?
>>>> btw not sure you absolutely need review from Andrzej, we're currently a
>>>> bit undersupplied with bridge reviewers I think ... Better to ramp up
>>>> more.
>>> I try to review DRM bridge patches when possible, but dw-hdmi is a
>>> special case. I was told by the supplier of an SoC datasheet that
>>> contains the HDMI encoder IP core documentation that Synopsys required
>>> them to route all contributions made based on that documentation through
>>> Synopsys' internal legal review before publishing them. I thus decided
>>> to not contribute to the driver anymore, at least for areas that require
>>> access to documentation.
>> I'd like to propose myself as co-maintainer of the DRM bridge subsystem if
>> everybody agrees, following the excellent work Laurent and Andrzej did.
>> I have a very little knowledge of DSI, & other bridge drivers, but I'll do
>> my best.
>>
>> For the dw-hdmi driver, we have a big roadmap including :
>> - HDR (this patchset)
>> - HDCP 1/2
>> - YUV420, YUV422, YUV44, 10bit/12bit/16bit HDMI output
>> - Enhanced audio support and ELD notification to ASoC
>> ...
> You're more than welcome as a DRM bridge maintainer, especially given
> that you have just volunteered to implement bridge states and format
> negotiation, right ? ;-)


Two (even three) birds with one stone :)


>
>> Having a more active maintainer/reviewer team would be needed, at least for
>> the dw-hdmi bridge.
>>
>> I'll also propose Jonas Karlman <jonas@...boo.se> as reviewer since he is very
>> active for the multimedia support on RockChip, Allwinner and Amlogic SoCs.
>> I'll also propose Jernej Skrabec@...l.net <jernej.skrabec@...l.net>, if he wants,
>> as reviewer since he is very active on the Allwinner SoCs side.


Welcome on board, I will wait one/two days for possible comments, then I
will queue MAINTAINERS patch.


Regards

Andrzej



>>
>>>>> On 26/05/2019 23:18, Jonas Karlman wrote:
>>>>>> Add support for HDR metadata using the hdr_output_metadata connector property,
>>>>>> configure Dynamic Range and Mastering InfoFrame accordingly.
>>>>>>
>>>>>> A drm_infoframe flag is added to dw_hdmi_plat_data that platform drivers
>>>>>> can use to signal when Dynamic Range and Mastering infoframes is supported.
>>>>>> This flag is needed because Amlogic GXBB and GXL report same DW-HDMI version,
>>>>>> and only GXL support DRM InfoFrame.
>>>>>>
>>>>>> The first patch add functionality to configure DRM InfoFrame based on the
>>>>>> hdr_output_metadata connector property.
>>>>>>
>>>>>> The remaining patches sets the drm_infoframe flag on some SoCs supporting
>>>>>> Dynamic Range and Mastering InfoFrame.
>>>>>>
>>>>>> Note that this was based on top of drm-misc-next and Neil Armstrong's
>>>>>> "drm/meson: Add support for HDMI2.0 YUV420 4k60" series at [1]
>>>>>>
>>>>>> [1] https://patchwork.freedesktop.org/series/58725/#rev2
>>>>>>
>>>>>> Jonas Karlman (4):
>>>>>>   drm/bridge: dw-hdmi: Add Dynamic Range and Mastering InfoFrame support
>>>>>>   drm/rockchip: Enable DRM InfoFrame support on RK3328 and RK3399
>>>>>>   drm/meson: Enable DRM InfoFrame support on GXL, GXM and G12A
>>>>>>   drm/sun4i: Enable DRM InfoFrame support on H6
>>>>>>
>>>>>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c   | 109 ++++++++++++++++++++
>>>>>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.h   |  37 +++++++
>>>>>>  drivers/gpu/drm/meson/meson_dw_hdmi.c       |   5 +
>>>>>>  drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c |   2 +
>>>>>>  drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c       |   2 +
>>>>>>  drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h       |   1 +
>>>>>>  include/drm/bridge/dw_hdmi.h                |   1 +
>>>>>>  7 files changed, 157 insertions(+)