linux-kernel - RE: [PATCH v4 5/7] drm: rcar-du: lvds: Fix mode for companion encoder

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Date:   Mon, 16 Dec 2019 18:43:04 +0000
From:   Fabrizio Castro <fabrizio.castro@...renesas.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:     Geert Uytterhoeven <geert+renesas@...der.be>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Sean Paul <sean@...rly.run>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        "ebiharaml@...linux.co.jp" <ebiharaml@...linux.co.jp>
Subject: RE: [PATCH v4 5/7] drm: rcar-du: lvds: Fix mode for companion encoder

Hi Laurent,

Thank you for your feedback!

> From: devicetree-owner@...r.kernel.org <devicetree-owner@...r.kernel.org> On Behalf Of Laurent Pinchart
> Sent: 13 December 2019 21:42
> Subject: Re: [PATCH v4 5/7] drm: rcar-du: lvds: Fix mode for companion encoder
> 
> Hi Fabrizio,
> 
> Thank you for the patch.
> 
> On Fri, Dec 06, 2019 at 04:32:52PM +0000, Fabrizio Castro wrote:
> > Primary and companion encoders need to set the same mode for
> > things to work properly.
> >
> > rcar_lvds_mode_set gets called into for the primary encoder only,
> > therefore initialize the companion encoder mode while sorting
> > the primary encoder mode out.
> >
> > Fixes: fa440d870358 ("drm: rcar-du: lvds: Add support for dual-link mode")
> > Signed-off-by: Fabrizio Castro <fabrizio.castro@...renesas.com>
> 
> Would you mind rebasing this on top of "drm: rcar-du: lvds: Get mode
> from state" ?

It looks like dropping this patch and rebasing on top of your v2 for
"drm: rcar-du: lvds: Get mode from state" does the trick now.

Will put a dependency to your patch in v5.

Cheers,
Fab

> 
> > ---
> > v3->v4:
> > * New patch extracted from patch:
> >   "drm: rcar-du: lvds: Add dual-LVDS panels support"
> > ---
> >  drivers/gpu/drm/rcar-du/rcar_lvds.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
> > index cb2147c..eed5611 100644
> > --- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
> > +++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
> > @@ -614,6 +614,18 @@ static void rcar_lvds_mode_set(struct drm_bridge *bridge,
> >  	lvds->display_mode = *adjusted_mode;
> >
> >  	rcar_lvds_get_lvds_mode(lvds);
> > +	if (lvds->companion) {
> > +		struct rcar_lvds *companion_lvds = bridge_to_rcar_lvds(
> > +							lvds->companion);
> > +
> > +		/*
> > +		 * FIXME: We should not be messing with the companion encoder
> > +		 * private data from the primary encoder, but since
> > +		 * rcar_lvds_mode_set gets called into for the primary encoder
> > +		 * only, we don't have much of a choice for now.
> > +		 */
> > +		companion_lvds->mode = lvds->mode;
> > +	}
> >  }
> >
> >  static int rcar_lvds_attach(struct drm_bridge *bridge)
> 
> --
> Regards,
> 
> Laurent Pinchart