drm/i915: introduce intel_audio_codec_{enable, disable}

Introduce functions to enable/disable the audio codec, incorporating the
ELD setup within enable. The disable is initially limited to HSW,
covering exactly what was done previously.

The only functional difference is that ELD valid is no longer set if
there is no connector with ELD, which should be the right thing to do
anyway. Otherwise the sequence remains the same, with warts and all, in
preparation for applying more sanity.

v2: add kernel doc.
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/i915_drv.h

@@ -483,9 +483,10 @@ struct drm_i915_display_funcs {
 	void (*crtc_enable)(struct drm_crtc *crtc);
 	void (*crtc_disable)(struct drm_crtc *crtc);
 	void (*off)(struct drm_crtc *crtc);
-	void (*write_eld)(struct drm_connector *connector,
+	void (*audio_codec_enable)(struct drm_connector *connector,
 				   struct intel_encoder *encoder,
 				   struct drm_display_mode *mode);
+	void (*audio_codec_disable)(struct intel_encoder *encoder);
 	void (*fdi_link_train)(struct drm_crtc *crtc);
 	void (*init_clock_gating)(struct drm_device *dev);
 	int (*queue_flip)(struct drm_device *dev, struct drm_crtc *crtc,

drivers/gpu/drm/i915/intel_audio.c

@@ -96,7 +96,7 @@ static bool intel_eld_uptodate(struct drm_connector *connector,
 	return true;
 }
 
-static void g4x_write_eld(struct drm_connector *connector,
+static void g4x_audio_codec_enable(struct drm_connector *connector,
 				   struct intel_encoder *encoder,
 				   struct drm_display_mode *mode)
 {
@@ -136,7 +136,20 @@ static void g4x_write_eld(struct drm_connector *connector,
 	I915_WRITE(G4X_AUD_CNTL_ST, tmp);
 }
 
-static void haswell_write_eld(struct drm_connector *connector,
+static void hsw_audio_codec_disable(struct intel_encoder *encoder)
+{
+	struct drm_device *dev = encoder->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_crtc *crtc = encoder->base.crtc;
+	enum pipe pipe = to_intel_crtc(crtc)->pipe;
+	uint32_t tmp;
+
+	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);
+}
+
+static void hsw_audio_codec_enable(struct drm_connector *connector,
 				   struct intel_encoder *encoder,
 				   struct drm_display_mode *mode)
 {
@@ -211,9 +224,14 @@ static void haswell_write_eld(struct drm_connector *connector,
 	tmp = I915_READ(aud_cntrl_st2);
 	tmp |= eldv;
 	I915_WRITE(aud_cntrl_st2, tmp);
+
+	/* XXX: Transitional */
+	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);
 }
 
-static void ironlake_write_eld(struct drm_connector *connector,
+static void ilk_audio_codec_enable(struct drm_connector *connector,
 				   struct intel_encoder *encoder,
 				   struct drm_display_mode *mode)
 {
@@ -303,7 +321,14 @@ static void ironlake_write_eld(struct drm_connector *connector,
 	I915_WRITE(aud_cntrl_st2, tmp);
 }
 
-void intel_write_eld(struct intel_encoder *intel_encoder)
+/**
+ * intel_audio_codec_enable - Enable the audio codec for HD audio
+ * @intel_encoder: encoder on which to enable audio
+ *
+ * The enable sequences may only be performed after enabling the transcoder and
+ * port, and after completed link training.
+ */
+void intel_audio_codec_enable(struct intel_encoder *intel_encoder)
 {
 	struct drm_encoder *encoder = &intel_encoder->base;
 	struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
@@ -329,8 +354,24 @@ void intel_write_eld(struct intel_encoder *intel_encoder)
 
 	connector->eld[6] = drm_av_sync_delay(connector, mode) / 2;
 
-	if (dev_priv->display.write_eld)
-		dev_priv->display.write_eld(connector, intel_encoder, mode);
+	if (dev_priv->display.audio_codec_enable)
+		dev_priv->display.audio_codec_enable(connector, intel_encoder, mode);
+}
+
+/**
+ * intel_audio_codec_disable - Disable the audio codec for HD audio
+ * @encoder: encoder on which to disable audio
+ *
+ * The disable sequences must be performed before disabling the transcoder or
+ * port.
+ */
+void intel_audio_codec_disable(struct intel_encoder *encoder)
+{
+	struct drm_device *dev = encoder->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
+	if (dev_priv->display.audio_codec_disable)
+		dev_priv->display.audio_codec_disable(encoder);
 }
 
 /**
@@ -341,12 +382,14 @@ void intel_init_audio(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
-	if (IS_G4X(dev))
-		dev_priv->display.write_eld = g4x_write_eld;
-	else if (IS_VALLEYVIEW(dev))
-		dev_priv->display.write_eld = ironlake_write_eld;
-	else if (IS_HASWELL(dev) || INTEL_INFO(dev)->gen >= 8)
-		dev_priv->display.write_eld = haswell_write_eld;
-	else if (HAS_PCH_SPLIT(dev))
-		dev_priv->display.write_eld = ironlake_write_eld;
+	if (IS_G4X(dev)) {
+		dev_priv->display.audio_codec_enable = g4x_audio_codec_enable;
+	} else if (IS_VALLEYVIEW(dev)) {
+		dev_priv->display.audio_codec_enable = ilk_audio_codec_enable;
+	} else if (IS_HASWELL(dev) || INTEL_INFO(dev)->gen >= 8) {
+		dev_priv->display.audio_codec_enable = hsw_audio_codec_enable;
+		dev_priv->display.audio_codec_disable = hsw_audio_codec_disable;
+	} else if (HAS_PCH_SPLIT(dev)) {
+		dev_priv->display.audio_codec_enable = ilk_audio_codec_enable;
+	}
 }

drivers/gpu/drm/i915/intel_ddi.c

@@ -1186,12 +1186,10 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder)
 	struct drm_encoder *encoder = &intel_encoder->base;
 	struct drm_crtc *crtc = encoder->crtc;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	int pipe = intel_crtc->pipe;
 	struct drm_device *dev = encoder->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	enum port port = intel_ddi_get_encoder_port(intel_encoder);
 	int type = intel_encoder->type;
-	uint32_t tmp;
 
 	if (type == INTEL_OUTPUT_HDMI) {
 		struct intel_digital_port *intel_dig_port =
@@ -1216,11 +1214,7 @@ 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);
+		intel_audio_codec_enable(intel_encoder);
 	}
 }
 
@@ -1229,19 +1223,12 @@ static void intel_disable_ddi(struct intel_encoder *intel_encoder)
 	struct drm_encoder *encoder = &intel_encoder->base;
 	struct drm_crtc *crtc = encoder->crtc;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	int pipe = intel_crtc->pipe;
 	int type = intel_encoder->type;
 	struct drm_device *dev = encoder->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	uint32_t tmp;
 
-	/* We can't touch HSW_AUD_PIN_ELD_CP_VLD uncionditionally because this
-	 * register is part of the power well on Haswell. */
 	if (intel_crtc->config.has_audio) {
-		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);
+		intel_audio_codec_disable(intel_encoder);
 		intel_display_power_put(dev_priv, POWER_DOMAIN_AUDIO);
 	}
 

drivers/gpu/drm/i915/intel_dp.c

@@ -1328,7 +1328,7 @@ static void intel_dp_prepare(struct intel_encoder *encoder)
 		DRM_DEBUG_DRIVER("Enabling DP audio on pipe %c\n",
 				 pipe_name(crtc->pipe));
 		intel_dp->DP |= DP_AUDIO_OUTPUT_ENABLE;
-		intel_write_eld(encoder);
+		intel_audio_codec_enable(encoder);
 	}
 
 	/* Split out the IBX/CPU vs CPT settings */

drivers/gpu/drm/i915/intel_drv.h

@@ -853,7 +853,8 @@ void intel_fb_obj_flush(struct drm_i915_gem_object *obj, bool retire);
 
 /* intel_audio.c */
 void intel_init_audio(struct drm_device *dev);
-void intel_write_eld(struct intel_encoder *encoder);
+void intel_audio_codec_enable(struct intel_encoder *encoder);
+void intel_audio_codec_disable(struct intel_encoder *encoder);
 
 /* intel_display.c */
 const char *intel_output_name(int output);

drivers/gpu/drm/i915/intel_hdmi.c

@@ -666,7 +666,7 @@ static void intel_hdmi_prepare(struct intel_encoder *encoder)
 		DRM_DEBUG_DRIVER("Enabling HDMI audio on pipe %c\n",
 				 pipe_name(crtc->pipe));
 		hdmi_val |= SDVO_AUDIO_ENABLE;
-		intel_write_eld(encoder);
+		intel_audio_codec_enable(encoder);
 	}
 
 	if (HAS_PCH_CPT(dev))