drm/i915/audio: Hardware ELD readout

Read out the ELD from the hardware buffer, or from our stashed
copy for the audio component, so that we can hook up the state
checker to validate it.

v2: Deal with the platforms using acomp

Cc: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Cc: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Jani Nikula <jani.nikula@intel.com> #v1
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230124144628.4649-7-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/display/g4x_dp.c

@@ -398,6 +398,8 @@ static void intel_dp_get_config(struct intel_encoder *encoder,
 
 	if (intel_dp_is_edp(intel_dp))
 		intel_edp_fixup_vbt_bpp(encoder, pipe_config->pipe_bpp);
+
+	intel_audio_codec_get_config(encoder, pipe_config);
 }
 
 static void

drivers/gpu/drm/i915/display/g4x_hdmi.c

@@ -155,6 +155,8 @@ static void intel_hdmi_get_config(struct intel_encoder *encoder,
 	intel_read_infoframe(encoder, pipe_config,
 			     HDMI_INFOFRAME_TYPE_VENDOR,
 			     &pipe_config->infoframes.hdmi);
+
+	intel_audio_codec_get_config(encoder, pipe_config);
 }
 
 static void g4x_hdmi_enable_port(struct intel_encoder *encoder,

drivers/gpu/drm/i915/display/intel_audio.c

@@ -71,6 +71,8 @@ struct intel_audio_funcs {
 	void (*audio_codec_disable)(struct intel_encoder *encoder,
 				    const struct intel_crtc_state *old_crtc_state,
 				    const struct drm_connector_state *old_conn_state);
+	void (*audio_codec_get_config)(struct intel_encoder *encoder,
+				       struct intel_crtc_state *crtc_state);
 };
 
 /* DP N/M table */
@@ -314,6 +316,27 @@ static int g4x_eld_buffer_size(struct drm_i915_private *i915)
 	return REG_FIELD_GET(G4X_ELD_BUFFER_SIZE_MASK, tmp);
 }
 
+static void g4x_audio_codec_get_config(struct intel_encoder *encoder,
+				       struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	u32 *eld = (u32 *)crtc_state->eld;
+	int eld_buffer_size, len, i;
+	u32 tmp;
+
+	tmp = intel_de_read(i915, G4X_AUD_CNTL_ST);
+	if ((tmp & G4X_ELD_VALID) == 0)
+		return;
+
+	intel_de_rmw(i915, G4X_AUD_CNTL_ST, G4X_ELD_ADDRESS_MASK, 0);
+
+	eld_buffer_size = g4x_eld_buffer_size(i915);
+	len = min_t(int, sizeof(crtc_state->eld) / 4, eld_buffer_size);
+
+	for (i = 0; i < len; i++)
+		eld[i] = intel_de_read(i915, G4X_HDMIW_HDMIEDID);
+}
+
 static void g4x_audio_codec_disable(struct intel_encoder *encoder,
 				    const struct intel_crtc_state *old_crtc_state,
 				    const struct drm_connector_state *old_conn_state)
@@ -886,19 +909,52 @@ void intel_audio_codec_disable(struct intel_encoder *encoder,
 	intel_lpe_audio_notify(i915, pipe, port, NULL, 0, false);
 }
 
+static void intel_acomp_get_config(struct intel_encoder *encoder,
+				   struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct intel_audio_state *audio_state;
+	enum pipe pipe = crtc->pipe;
+
+	mutex_lock(&i915->display.audio.mutex);
+
+	audio_state = &i915->display.audio.state[pipe];
+
+	if (audio_state->encoder)
+		memcpy(crtc_state->eld, audio_state->eld, sizeof(audio_state->eld));
+
+	mutex_unlock(&i915->display.audio.mutex);
+}
+
+void intel_audio_codec_get_config(struct intel_encoder *encoder,
+				  struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+
+	if (!crtc_state->has_audio)
+		return;
+
+	if (i915->display.funcs.audio)
+		i915->display.funcs.audio->audio_codec_get_config(encoder, crtc_state);
+}
+
 static const struct intel_audio_funcs g4x_audio_funcs = {
 	.audio_codec_enable = g4x_audio_codec_enable,
 	.audio_codec_disable = g4x_audio_codec_disable,
+	.audio_codec_get_config = g4x_audio_codec_get_config,
 };
 
 static const struct intel_audio_funcs ilk_audio_funcs = {
 	.audio_codec_enable = ilk_audio_codec_enable,
 	.audio_codec_disable = ilk_audio_codec_disable,
+	.audio_codec_get_config = intel_acomp_get_config,
 };
 
 static const struct intel_audio_funcs hsw_audio_funcs = {
 	.audio_codec_enable = hsw_audio_codec_enable,
 	.audio_codec_disable = hsw_audio_codec_disable,
+	.audio_codec_get_config = intel_acomp_get_config,
 };
 
 /**

drivers/gpu/drm/i915/display/intel_audio.h

@@ -23,6 +23,8 @@ void intel_audio_codec_enable(struct intel_encoder *encoder,
 void intel_audio_codec_disable(struct intel_encoder *encoder,
 			       const struct intel_crtc_state *old_crtc_state,
 			       const struct drm_connector_state *old_conn_state);
+void intel_audio_codec_get_config(struct intel_encoder *encoder,
+				  struct intel_crtc_state *crtc_state);
 void intel_audio_cdclk_change_pre(struct drm_i915_private *dev_priv);
 void intel_audio_cdclk_change_post(struct drm_i915_private *dev_priv);
 void intel_audio_init(struct drm_i915_private *dev_priv);

drivers/gpu/drm/i915/display/intel_ddi.c

@@ -3496,6 +3496,8 @@ static void intel_ddi_get_config(struct intel_encoder *encoder,
 	intel_read_dp_sdp(encoder, pipe_config, DP_SDP_VSC);
 
 	intel_psr_get_config(encoder, pipe_config);
+
+	intel_audio_codec_get_config(encoder, pipe_config);
 }
 
 void intel_ddi_get_clock(struct intel_encoder *encoder,