drm/i915/ddi: write ELD where it's supposed to be done

The audio programming sequence states that the ELD must be written and
enabled after the pipe is ready. Indeed, this should clarify the
situation with

commit c79057922ed6c2c6df1214e6ab4414fea1b23db2
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Apr 16 16:56:09 2014 +0200

    drm/i915: Remove vblank wait from haswell_write_eld

and Ville's review of it [1].

Moreover, we should not touch the relevant registers before we get the
audio power domain.

[1] http://mid.gmane.org/20140416155309.GK18465@intel.com

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_audio.c

@@ -160,8 +160,6 @@ static void haswell_write_eld(struct drm_connector *connector,
 	I915_WRITE(aud_cntrl_st2, tmp);
 	POSTING_READ(aud_cntrl_st2);
 
-	assert_pipe_disabled(dev_priv, pipe);
-
 	/* Set ELD valid state */
 	tmp = I915_READ(aud_cntrl_st2);
 	DRM_DEBUG_DRIVER("HDMI audio: pin eld vld status=0x%08x\n", tmp);

drivers/gpu/drm/i915/intel_ddi.c

@@ -1120,15 +1120,6 @@ static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder)
 	enum port port = intel_ddi_get_encoder_port(intel_encoder);
 	int type = intel_encoder->type;
 
-	if (crtc->config.has_audio) {
-		DRM_DEBUG_DRIVER("Audio on pipe %c on DDI\n",
-				 pipe_name(crtc->pipe));
-
-		/* write eld */
-		DRM_DEBUG_DRIVER("DDI audio: write eld information\n");
-		intel_write_eld(intel_encoder);
-	}
-
 	if (type == INTEL_OUTPUT_EDP) {
 		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 		intel_edp_panel_on(intel_dp);
@@ -1225,6 +1216,8 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder)
 
 	if (intel_crtc->config.has_audio) {
 		intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
+		intel_write_eld(intel_encoder);
+
 		tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
 		tmp |= ((AUDIO_OUTPUT_ENABLE_A | AUDIO_ELD_VALID_A) << (pipe * 4));
 		I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);