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

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Date:   Wed, 31 May 2017 10:07:55 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Archit Taneja <architt@...eaurora.org>
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.

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?

Regards,

Boris