linux-kernel - Re: [PATCH 4/7] drm/exynos/hdmi: add bridge support

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Message-id: <faefa2bc-0e52-f4a7-3968-e5b7c07d50a0@samsung.com>
Date:   Wed, 01 Feb 2017 09:12:46 +0100
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Inki Dae <inki.dae@...sung.com>, dri-devel@...ts.freedesktop.org,
        Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 4/7] drm/exynos/hdmi: add bridge support

On 01.02.2017 08:44, Inki Dae wrote:
>
> 2017년 02월 01일 16:34에 Andrzej Hajda 이(가) 쓴 글:
>> On 01.02.2017 08:31, Inki Dae wrote:
>>> 2017년 01월 20일 15:52에 Andrzej Hajda 이(가) 쓴 글:
>>>> In some platforms there is attached another device to the end of HDMI.
>>>> The patch adds support for it.
>>> Andrzej, can you clarify what bridge device can be attached and actually is now attached to the end of HDMI?
>>> And I wonder if we have the device tree file which defines the bridge device in mainline. Seems we have no the device tree file.
>>>
>>> If nothing, then this patch should be merged with real use case.
>> SiI8620 MHL bridge in tm2/tm2e.
> Did you post dt patch to add the properties related to SiI8620 MHL bridge device?
>
> I see below patch series,
> [PATCH 00/24] drm/bridge/sii8620: add Ultra HD modes support
>
> but I couldn't find dt patch for it. And specifying SiI8620 MHL bridge device as description would be needed.
>
> Thanks.
>
>

Patch adding HDMI path to tm2(e) including SiI8620 node and OF bindings
between hdmi and SiI8620 [1].
As the bridge framework in lower modes was used only to eliminate
unsupported modes, support for bridge in exynos_hdmi driver was not
critical, HDMI path worked well and I forgot about it.
But for UltraHD modes it is required as SiI8620 uses bridge framework to
gather info about applied video mode to program registers accordingly.
I will add requested description to this patch.

[1]: http://www.spinics.net/lists/devicetree/msg157892.html

Regards
Andrzej