linux-kernel - Re: [PATCH v2 5/7] drm/ltdc: Use the panel-bridge helper.

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Date:   Wed, 31 May 2017 14:05:46 +0530
From:   Archit Taneja <architt@...eaurora.org>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:     Philippe CORNU <philippe.cornu@...com>,
        Eric Anholt <eric@...olt.net>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        CK Hu <ck.hu@...iatek.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Yannick FERTRE <yannick.fertre@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/7] drm/ltdc: Use the panel-bridge helper.



On 05/31/2017 01:37 PM, Boris Brezillon wrote:
> Hi Archit,
>
> Le Wed, 31 May 2017 13:31:16 +0530,
> Archit Taneja <architt@...eaurora.org> a écrit :
>
>> Hi Boris,
>>
>> On 05/31/2017 11:56 AM, Boris Brezillon wrote:
>>> Hi Philippe,
>>>
>>> Le Tue, 30 May 2017 16:55:42 +0000,
>>> Philippe CORNU <philippe.cornu@...com> a écrit :
>>>
>>>> Hi Eric,
>>>>
>>>> I took your patch for the panel-bridge and it works perfectly in both
>>>> DPI mode (panel RGB //) and DSI mode (bridge dw mipi dsi), bravo :-)
>>>
>>> I still don't understand how it can work without a call to
>>> drm_bridge_attach() (which is used to link the RGB encoder to the DPI
>>> connector). I'm probably missing something obvious. Maybe someone can
>>> point it out :-).
>>
>> I think the expectation is that there will be a follow-up patch that
>> would add bridge support. Philippe had posted a patch for adding bridges
>> to ltdc before:
>>
>> https://patchwork.kernel.org/patch/9724835/
>>
>> He can now redo his patch over Eric's panel-bridge patch-set.
>
> But by doing that you're breaking bisectability, or is it working when
> applying only Eric's patchset?
>
> If applying this patch breaks the driver, why not applying it after
> bridge support has been added to this driver?

Yeah, it would break the driver. Philippe can create a patch that adds
bridge support using the panel-bridge glue layer using Eric's patch as a
reference. In the end, there should only be a single patch.

Thanks,
Archit

>
> Regards,
>
> Boris
>

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