linux-kernel - Re: [PATCH v7 2/4] drm/panel: set display info in panel attach

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Date:   Fri, 26 Jul 2019 15:15:06 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     "dbasehore ." <dbasehore@...omium.org>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Intel Graphics <intel-gfx@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        David Airlie <airlied@...ux.ie>,
        Thierry Reding <thierry.reding@...il.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sean Paul <sean@...rly.run>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v7 2/4] drm/panel: set display info in panel attach

Hi Derek.

On Wed, Jul 24, 2019 at 03:15:19PM -0700, dbasehore . wrote:
> Hi Sam, thanks for pointing out the potential conflict.
> 
> On Tue, Jul 23, 2019 at 2:19 AM Sam Ravnborg <sam@...nborg.org> wrote:
> >
> > Hi Derek.
> >
> > On Tue, Jul 09, 2019 at 07:16:57PM -0700, Derek Basehore wrote:
> > > Devicetree systems can set panel orientation via a panel binding, but
> > > there's no way, as is, to propagate this setting to the connector,
> > > where the property need to be added.
> > > To address this, this patch sets orientation, as well as other fixed
> > > values for the panel, in the drm_panel_attach function. These values
> > > are stored from probe in the drm_panel struct.
> >
> > This approch seems to conflict with work done by Laurent where the
> > ownership/creation of the connector will be moved to the display controller.
> >
> > If I understand it correct then there should not be a 1:1 relation
> > between a panel and a connector anymore.
> 
> 
> Can you point me to this work?
Please take a look at the series with subject:
"[PATCH 00/60] drm/omap: Replace custom display drivers with drm_bridge
and drm_panel"
Link: https://patchwork.kernel.org/cover/11034175/

Laurent has done a great job explaining the background,
If you look into the patched you will see the idea is that a drm_panel
no longer get attached to a drm_controller - it will be an argument to
get_modes().

	Sam