linux-kernel - Re: [PATCH] drm/i915/mst: Hookup DRM DP MST late_register/early

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Date:   Tue, 10 Mar 2020 14:43:40 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     intel-gfx@...ts.freedesktop.org,
        Manasi Navare <manasi.d.navare@...el.com>,
        "Lee, Shawn C" <shawn.c.lee@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        José Roberto de Souza 
        <jose.souza@...el.com>, Chris Wilson <chris@...is-wilson.co.uk>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915/mst: Hookup DRM DP MST
 late_register/early_unregister callbacks

On Tue, 2020-03-10 at 20:42 +0200, Ville Syrjälä wrote:
> On Tue, Mar 10, 2020 at 02:28:54PM -0400, Lyude Paul wrote:
> > i915 can enable aux device nodes for DP MST by calling
> > drm_dp_mst_connector_late_register()/drm_dp_mst_connector_early_unregister
> > (),
> > so let's hook that up.
> 
> Oh, we didn't have that yet? I thought it got hooked up for everyone
> but I guess not.
> 
> > Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> > Cc: Manasi Navare <manasi.d.navare@...el.com>
> > Cc: "Lee, Shawn C" <shawn.c.lee@...el.com>
> > Signed-off-by: Lyude Paul <lyude@...hat.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_dp_mst.c | 22 +++++++++++++++++++--
> >  1 file changed, 20 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > index d53978ed3c12..bcff2e06ead6 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > @@ -548,12 +548,30 @@ static int intel_dp_mst_get_ddc_modes(struct
> > drm_connector *connector)
> >  	return ret;
> >  }
> >  
> > +static int
> > +intel_dp_mst_connector_late_register(struct drm_connector *connector)
> > +{
> > +	struct intel_connector *intel_connector =
> > to_intel_connector(connector);
> > +
> > +	return drm_dp_mst_connector_late_register(connector,
> > +						  intel_connector->port);
> > +}
> > +
> > +static void
> > +intel_dp_mst_connector_early_unregister(struct drm_connector *connector)
> > +{
> > +	struct intel_connector *intel_connector =
> > to_intel_connector(connector);
> > +
> > +	drm_dp_mst_connector_early_unregister(connector,
> > +					      intel_connector->port);
> > +}
> > +
> >  static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
> >  	.fill_modes = drm_helper_probe_single_connector_modes,
> >  	.atomic_get_property = intel_digital_connector_atomic_get_property,
> >  	.atomic_set_property = intel_digital_connector_atomic_set_property,
> > -	.late_register = intel_connector_register,
> 
> Dunno if we want to lose the error injection...

Gotcha, will send out a fixed respin in just a moment
> 
> > -	.early_unregister = intel_connector_unregister,
> > +	.late_register = intel_dp_mst_connector_late_register,
> > +	.early_unregister = intel_dp_mst_connector_early_unregister,
> >  	.destroy = intel_connector_destroy,
> >  	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> >  	.atomic_duplicate_state = intel_digital_connector_duplicate_state,
> > -- 
> > 2.24.1
-- 
Cheers,
	Lyude Paul (she/her)
	Associate Software Engineer at Red Hat