[PATCH v4 3/7] drm: Add DisplayPort colorspace property

[Ilia Mirkin]

On Sat, Sep 7, 2019 at 7:20 PM Mun, Gwan-gyeong
<gwan-gyeong.mun at intel.com> wrote:
>
> On Fri, 2019-09-06 at 09:24 -0400, Ilia Mirkin wrote:
> > On Fri, Sep 6, 2019 at 7:43 AM Ville Syrjälä
> > <ville.syrjala at linux.intel.com> wrote:
> > > On Fri, Sep 06, 2019 at 11:31:55AM +0000, Shankar, Uma wrote:
> > > >
> > > > > -----Original Message-----
> > > > > From: Ilia Mirkin <imirkin at alum.mit.edu>
> > > > > Sent: Tuesday, September 3, 2019 6:12 PM
> > > > > To: Mun, Gwan-gyeong <gwan-gyeong.mun at intel.com>
> > > > > Cc: Intel Graphics Development <intel-gfx at lists.freedesktop.org
> > > > > >; Shankar, Uma
> > > > > <uma.shankar at intel.com>; dri-devel <
> > > > > dri-devel at lists.freedesktop.org>
> > > > > Subject: Re: [PATCH v4 3/7] drm: Add DisplayPort colorspace
> > > > > property
> > > > >
> > > > > So how would this work with a DP++ connector? Should it list
> > > > > the HDMI or DP
> > > > > properties? Or do we need a custom property checker which is
> > > > > aware of what is
> > > > > currently plugged in to validate the values?
> > > >
> > > > AFAIU For DP++ cases, we detect what kind of sink its driving DP
> > > > or HDMI (with a passive dongle).
> > > > Based on the type of sink detected, we should expose DP or HDMI
> > > > colorspaces to userspace.
> > >
> > > For i915 DP connector always drives DP mode, HDMI connector always
> > > drives
> > > HDMI mode, even when the physical connector is DP++.
> >
> > Right, i915 creates 2 connectors, while nouveau, radeon, and amdgpu
> > create 1 connector (not sure about other drivers) for a single
> > physical DP++ socket. Since we supply the list of valid values at the
> > time of creating the connector, we can't know at that point whether
> > in
> > the future a HDMI or DP will be plugged into it.
> >
> >   -ilia
> Ilia, does it mean that the drm_connector type is
> DRM_MODE_CONNECTOR_DisplayPort and protocol is DP++ mode?

That is correct. The connector type is "DisplayPort" in such a case.

Cheers,

  -ilia