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From: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>,
	Jacopo Mondi <jacopo+renesas@jmondi.org>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	"dri-devel@lists.freedesktop.org"
	<dri-devel@lists.freedesktop.org>,
	"linux-renesas-soc@vger.kernel.org" 
	<linux-renesas-soc@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Simon Horman <horms@verge.net.au>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Chris Paterson <Chris.Paterson2@renesas.com>,
	Biju Das <biju.das@bp.renesas.com>
Subject: RE: [PATCH/RFC 02/12] dt-bindings: display: renesas: lvds: Document renesas,swap-data
Date: Mon, 5 Aug 2019 10:07:24 +0000	[thread overview]
Message-ID: <TY1PR01MB1770C5AB21E45C24158584B7C0DA0@TY1PR01MB1770.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <20190805093543.GB29747@pendragon.ideasonboard.com>

Hi Laurent,

> From: linux-kernel-owner@vger.kernel.org <linux-kernel-owner@vger.kernel.org> On Behalf Of Laurent Pinchart
> Sent: 05 August 2019 10:36
> Subject: Re: [PATCH/RFC 02/12] dt-bindings: display: renesas: lvds: Document renesas,swap-data
> 
> Hi Fabrizio,
> 
> On Mon, Aug 05, 2019 at 08:59:51AM +0000, Fabrizio Castro wrote:
> > > From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > > Sent: 02 August 2019 08:44
> > > Subject: Re: [PATCH/RFC 02/12] dt-bindings: display: renesas: lvds: Document renesas,swap-data
> > >
> > > Hi Fabrizio,
> > >
> > > Thank you for the patch.
> > >
> > > On Fri, Aug 02, 2019 at 08:33:59AM +0100, Fabrizio Castro wrote:
> > > > R-Car D3, R-Car E3, and RZ/G2E support dual-link mode.
> > > > In such a mode, the first LVDS encoder emits even data, and the
> > > > second LVDS encoder emits odd data. This patch documents property
> > > > renesas,swap-data, used to swap even and odd data around.
> > > >
> > > > Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> > > > ---
> > > >  Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt | 5 +++++
> > > >  1 file changed, 5 insertions(+)
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt
> > > b/Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt
> > > > index dece79e..8980179 100644
> > > > --- a/Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt
> > > > +++ b/Documentation/devicetree/bindings/display/bridge/renesas,lvds.txt
> > > > @@ -52,6 +52,11 @@ Optional properties:
> > > >    mandatory for the first LVDS encoder on R-Car D3, R-Car E3, and RZ/G2E SoCs,
> > > >    and shall point to the second encoder to be used as a companion in dual-link
> > > >    mode. It shall not be set for any other LVDS encoder.
> > > > +- renesas,swap-data : when in dual-link mode, the first LVDS encoder normally
> > > > +  emits even data, and the second LVDS encoder emits odd data. When property
> > > > +  renesas,swap-data is specified, the data emitted by the two encoders will be
> > > > +  swapped around. This property can only be used in conjunction with property
> > > > +  renesas,companion.
> > >
> > > From an LVDS encoder point of view this is more a configuration option
> > > than a description of the hardware. Wouldn't it be better for the LVDS
> > > sink to report which of the odd or even pixels it expects on each of its
> > > endpoints ?
> >
> > Yes, that would be my preference too, and it would be better, I am just not entirely
> > what's the best place for this information though
> >
> > > The LVDS encoder driver could then query that at runtime and
> > > configure itself accordingly. Ideally this should be queried through the
> > > drm_bridge_timings structure (or through a similar mean), not through
> > > DT. An LVDS sink that has a fixed mapping of odd/even pixels to
> > > endpoints wouldn't need the information to be specified in DT at all.
> >
> > Isn't drm_bridge_timings specific for bridges?
> 
> Its name makes it specific to bridges, but the information it contains
> could equally apply to panels. I would thus use it for both, possibly
> after renaming it.

Will give this a try then.

Thanks,
Fab

> 
> --
> Regards,
> 
> Laurent Pinchart

  reply	other threads:[~2019-08-05 10:07 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-02  7:33 [PATCH/RFC 00/12] Add dual-LVDS panel support to EK874 Fabrizio Castro
2019-08-02  7:33 ` [PATCH/RFC 01/12] dt-bindings: display: renesas: lvds: RZ/G2E needs renesas,companion too Fabrizio Castro
2019-08-02  7:48   ` Laurent Pinchart
2019-08-02  7:33 ` [PATCH/RFC 02/12] dt-bindings: display: renesas: lvds: Document renesas,swap-data Fabrizio Castro
2019-08-02  7:44   ` Laurent Pinchart
2019-08-05  8:59     ` Fabrizio Castro
2019-08-05  9:35       ` Laurent Pinchart
2019-08-05 10:07         ` Fabrizio Castro [this message]
2019-08-02  7:34 ` [PATCH/RFC 03/12] dt-bindings: panel: lvds: Add dual-link LVDS display support Fabrizio Castro
2019-08-02  8:00   ` Laurent Pinchart
2019-08-05  9:02     ` Fabrizio Castro
2019-08-02  7:34 ` [PATCH/RFC 04/12] dt-bindings: display: Add bindings for Advantech IDK-2121WR Fabrizio Castro
2019-08-02  8:03   ` Laurent Pinchart
2019-08-05  9:04     ` Fabrizio Castro
2019-08-02  7:34 ` [PATCH/RFC 05/12] drm: rcar-du: lvds: Add data swap support Fabrizio Castro
2019-08-02  8:06   ` Laurent Pinchart
2019-08-02  9:01     ` Geert Uytterhoeven
2019-08-05  9:32     ` Fabrizio Castro
2019-08-05 10:17       ` Laurent Pinchart
2019-08-02  7:34 ` [PATCH/RFC 06/12] drm: rcar-du: lvds: Do not look at ports for identifying bridges Fabrizio Castro
2019-08-02  8:08   ` Laurent Pinchart
2019-08-05  9:06     ` Fabrizio Castro
2019-08-02  7:34 ` [PATCH/RFC 07/12] drm: rcar-du: lvds: Add support for dual link panels Fabrizio Castro
2019-08-02  8:20   ` Laurent Pinchart
2019-08-05  9:12     ` Fabrizio Castro
2019-08-05  9:48       ` Laurent Pinchart
2019-08-05 10:07         ` Fabrizio Castro
2019-08-02  7:34 ` [PATCH/RFC 08/12] drm: rcar-du: lvds: Fix bridge_to_rcar_lvds Fabrizio Castro
2019-08-02  8:22   ` Laurent Pinchart
2019-08-05  9:13     ` Fabrizio Castro
2019-08-02  7:34 ` [PATCH/RFC 09/12] drm: rcar-du: lvds: Fix companion's mode Fabrizio Castro
2019-08-02  8:26   ` Laurent Pinchart
2019-08-05  9:15     ` Fabrizio Castro

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