drm/i915: Disable infoframes when shutting down DDI HDMI

Disabling the video DIP when shutting the port down seems like a good
idea.

Bspec says:
"When disabling both the DIP port and DIP transmission,
 first disable the port and then disable DIP."
and
"Restriction : GCP is only supported with HDMI when the bits per color is
 not equal to 8. GCP must be enabled prior to enabling TRANS_DDI_FUNC_CTL
 for HDMI with bits per color not equal to 8 and disabled after disabling
 TRANS_DDI_FUNC_CTL"

So let's do it in the .post_disable() hook.

v2: Remove double "dpms off" caused by rebase fail
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170822140914.24413-1-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/intel_ddi.c

@@ -2211,7 +2211,6 @@ static void intel_ddi_post_disable(struct intel_encoder *intel_encoder,
 	struct drm_i915_private *dev_priv = to_i915(encoder->dev);
 	enum port port = intel_ddi_get_encoder_port(intel_encoder);
 	struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
-	struct intel_dp *intel_dp = NULL;
 	int type = intel_encoder->type;
 	uint32_t val;
 	bool wait = false;
@@ -2219,7 +2218,8 @@ static void intel_ddi_post_disable(struct intel_encoder *intel_encoder,
 	/* old_crtc_state and old_conn_state are NULL when called from DP_MST */
 
 	if (type == INTEL_OUTPUT_DP || type == INTEL_OUTPUT_EDP) {
-		intel_dp = enc_to_intel_dp(encoder);
+		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
 		intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 	}
 
@@ -2238,7 +2238,16 @@ static void intel_ddi_post_disable(struct intel_encoder *intel_encoder,
 	if (wait)
 		intel_wait_ddi_buf_idle(dev_priv, port);
 
-	if (intel_dp) {
+	if (type == INTEL_OUTPUT_HDMI) {
+		struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
+
+		intel_hdmi->set_infoframes(encoder, false,
+					   old_crtc_state, old_conn_state);
+	}
+
+	if (type == INTEL_OUTPUT_DP || type == INTEL_OUTPUT_EDP) {
+		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
 		intel_edp_panel_vdd_on(intel_dp);
 		intel_edp_panel_off(intel_dp);
 	}