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.

From: Anuar, Nuhairi
Sent: Wednesday, June 14, 2017 10:55 PM
To: Ville Syrjälä <ville.syrjala@linux.intel.com>; He, Min <min.he@intel.com>
Cc: intel-gfx@lists.freedesktop.org; Mustaffa, Mustamin B <mustamin.b.mustaffa@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@linux.intel.com> wrote:

On Wed, Jun 14, 2017 at 01:47:30PM +0800, Mustamin B Mustaffa wrote:
> From: "Anuar, Nuhairi" <nuhairi.anuar@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@intel.com>
> Signed-off-by: Nuhairi Anuar <nuhairi.anuar@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
>
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--
Ville Syrjälä
Intel OTC