linux-kernel - Re: [PATCH 5/5] drm: panel: simple-panel: add bus format information for foxlink panel

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Date:	Tue, 23 Sep 2014 16:13:01 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	linux-media@...r.kernel.org
Subject: Re: [PATCH 5/5] drm: panel: simple-panel: add bus format
 information for foxlink panel

Hi Thierry,

On Tue, 23 Sep 2014 16:06:13 +0200
Thierry Reding <thierry.reding@...il.com> wrote:

> On Tue, Jul 22, 2014 at 02:23:47PM +0200, Boris BREZILLON wrote:
> > Foxlink's fl500wvr00-a0t supports RGB888 format.
> > 
> > Signed-off-by: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> > ---
> >  drivers/gpu/drm/panel/panel-simple.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> > index 42fd6d1..f1e49fd 100644
> > --- a/drivers/gpu/drm/panel/panel-simple.c
> > +++ b/drivers/gpu/drm/panel/panel-simple.c
> > @@ -428,6 +428,7 @@ static const struct panel_desc foxlink_fl500wvr00_a0t = {
> >  		.width = 108,
> >  		.height = 65,
> >  	},
> > +	.bus_format = VIDEO_BUS_FMT_RGB888_1X24,
> 
> This is really equivalent to .bpc = 8. Didn't you say you had other
> use-cases where .bpc wasn't sufficient?

Yes, the HLCDC support RGB565 where you don't have the same number of
bits for each color (Red and Blue = 5 bits, Green = 6 bits), and thus
can't be encoded in the bpc field.

> 
> Thierry



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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