[Intel-gfx] [PATCH] drm/i915: fix the issue DP-1 not working in guest

[Ville Syrjälä]

On Thu, Jun 15, 2017 at 03:53:18AM +0000, Anuar, Nuhairi wrote:
> To be clear, I believe right now, GVT-g architecture on upstream still only have one Virtualized DP monitor which will be on port B/D, but we have patches (not yet upstream) that have 3 virtualized DP monitors which will be attached to Port A/B/D. So we need to add this flexibility in the code so that it is not conflicted with eDP logic.

Please don't do that. Real hardware doesn't support non-eDP on port A,
so your virtualized thing shouldn't either. Why aren't you putting it on
port C instead?

> 
> 
> 
> From: Anuar, Nuhairi
> Sent: Wednesday, June 14, 2017 10:55 PM
> To: Ville Syrjälä <ville.syrjala at linux.intel.com>; He, Min <min.he at intel.com>
> Cc: intel-gfx at lists.freedesktop.org; Mustaffa, Mustamin B <mustamin.b.mustaffa at intel.com>
> Subject: Re: [Intel-gfx] [PATCH] drm/i915: fix the issue DP-1 not working in guest
> 
> For a virtualized boot, it is possible for port A to be tied to DP.
> 
> Min He any additional comment?
> 
> On Jun 14, 2017 9:38 PM, Ville Syrjälä <ville.syrjala at linux.intel.com<mailto:ville.syrjala at linux.intel.com>> wrote:
> On Wed, Jun 14, 2017 at 01:47:30PM +0800, Mustamin B Mustaffa wrote:
> > From: "Anuar, Nuhairi" <nuhairi.anuar at intel.com<mailto:nuhairi.anuar at intel.com>>
> >
> > In GVT guest, when port A is DP, i915 will force it as an EDP panel,
> > which
> > will cause DP-1 not working in GVT guest.
> > This patch fixed this issue by check intel_vgpu_active() in
> > intel_ddi_compute_config().
> >
> > Signed-off-by: Min He <min.he at intel.com<mailto:min.he at intel.com>>
> > Signed-off-by: Nuhairi Anuar <nuhairi.anuar at intel.com<mailto:nuhairi.anuar at intel.com>>
> > ---
> >  drivers/gpu/drm/i915/intel_ddi.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> > index 66b367d..1110cbc 100644
> > --- a/drivers/gpu/drm/i915/intel_ddi.c
> > +++ b/drivers/gpu/drm/i915/intel_ddi.c
> > @@ -2069,7 +2069,7 @@ static bool intel_ddi_compute_config(struct intel_encoder *encoder,
> >
> >        WARN(type == INTEL_OUTPUT_UNKNOWN, "compute_config() on unknown output!\n");
> >
> > -     if (port == PORT_A)
> > +     if (port == PORT_A && !intel_vgpu_active(dev_priv))
> >                pipe_config->cpu_transcoder = TRANSCODER_EDP;
> 
> And why exactly are you trying to register DP on port A?
> 
> >
> >        if (type == INTEL_OUTPUT_HDMI)
> > --
> > 1.9.1
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx at lists.freedesktop.org<mailto:Intel-gfx at lists.freedesktop.org>
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> --
> Ville Syrjälä
> Intel OTC
> 

-- 
Ville Syrjälä
Intel OTC