drm/i915: Don't rely upon encoder->type for infoframe hw state readout

encoder->type can change underneath us and doesn't need to reflect
actual hw state (since we don't construct it from hw state like
e.g. encoder->crtc crtc->config).

And this can indeed happen:
1) Boot with plugged-in hdmi screen. Since we only set ->type in the
   probe functions this means we won't detect any infoframes since
   type is still unkown.
2) First probe sets type to HDMI.
3) If the first modeset now does _not_ happen on the HDMI pipe with
   infoframes encoder->get_config suddenly sees infoframes and the
   state checker gets angry.

Fix this by only relying on actual hw state when figuring out whether
the ddi port is in hdmi mode and sends infoframes.

Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Paulo Zanoni <przanoni@gmail.com>
Reported-by: Paulo Zanoni <przanoni@gmail.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_ddi.c

@@ -2027,6 +2027,7 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
 	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 	enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder;
+	struct intel_hdmi *intel_hdmi;
 	u32 temp, flags = 0;
 	struct drm_device *dev = dev_priv->dev;
 
@@ -2062,6 +2063,10 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
 	switch (temp & TRANS_DDI_MODE_SELECT_MASK) {
 	case TRANS_DDI_MODE_SELECT_HDMI:
 		pipe_config->has_hdmi_sink = true;
+		intel_hdmi = enc_to_intel_hdmi(&encoder->base);
+
+		if (intel_hdmi->infoframe_enabled(&encoder->base))
+			pipe_config->has_infoframe = true;
 		break;
 	case TRANS_DDI_MODE_SELECT_DVI:
 	case TRANS_DDI_MODE_SELECT_FDI:
@@ -2075,14 +2080,6 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
 		break;
 	}
 
-	if (encoder->type == INTEL_OUTPUT_HDMI) {
-		struct intel_hdmi *intel_hdmi =
-			enc_to_intel_hdmi(&encoder->base);
-
-		if (intel_hdmi->infoframe_enabled(&encoder->base))
-			pipe_config->has_infoframe = true;
-	}
-
 	if (intel_display_power_is_enabled(dev_priv, POWER_DOMAIN_AUDIO)) {
 		temp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
 		if (temp & AUDIO_OUTPUT_ENABLE(intel_crtc->pipe))