[PATCH 16/22] drm/i915/audio: Hardware ELD readout

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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

Read out the ELD from the hardware buffer so that we can
hook up the state checker to validate it.

Cc: Chaitanya Kumar Borah <chaitanya.kumar.borah@xxxxxxxxx>
Cc: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx>
Cc: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/display/g4x_dp.c      |  2 +
 drivers/gpu/drm/i915/display/g4x_hdmi.c    |  2 +
 drivers/gpu/drm/i915/display/intel_audio.c | 88 ++++++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_audio.h |  2 +
 drivers/gpu/drm/i915/display/intel_ddi.c   |  2 +
 5 files changed, 96 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/g4x_dp.c b/drivers/gpu/drm/i915/display/g4x_dp.c
index e3e3d27ffb53..4fc7153ad35a 100644
--- a/drivers/gpu/drm/i915/display/g4x_dp.c
+++ b/drivers/gpu/drm/i915/display/g4x_dp.c
@@ -397,6 +397,8 @@ 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
diff --git a/drivers/gpu/drm/i915/display/g4x_hdmi.c b/drivers/gpu/drm/i915/display/g4x_hdmi.c
index 8aadf96fa5e9..478878abada6 100644
--- a/drivers/gpu/drm/i915/display/g4x_hdmi.c
+++ b/drivers/gpu/drm/i915/display/g4x_hdmi.c
@@ -142,6 +142,8 @@ 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_enable_hdmi(struct intel_atomic_state *state,
diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c
index 39291e870635..328c47719fd8 100644
--- a/drivers/gpu/drm/i915/display/intel_audio.c
+++ b/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 */
@@ -313,6 +315,27 @@ 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)
@@ -467,6 +490,29 @@ static int hsw_eld_buffer_size(struct drm_i915_private *i915,
 	return REG_FIELD_GET(IBX_ELD_BUFFER_SIZE_MASK, tmp);
 }
 
+static void hsw_audio_codec_get_config(struct intel_encoder *encoder,
+				       struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+	u32 *eld = (u32 *)crtc_state->eld;
+	int eld_buffer_size, len, i;
+	u32 tmp;
+
+	tmp = intel_de_read(i915, HSW_AUD_PIN_ELD_CP_VLD);
+	if ((tmp & AUDIO_ELD_VALID(cpu_transcoder)) == 0)
+		return;
+
+	intel_de_rmw(i915, HSW_AUD_DIP_ELD_CTRL(cpu_transcoder),
+		     IBX_ELD_ADDRESS_MASK, 0);
+
+	eld_buffer_size = hsw_eld_buffer_size(i915, cpu_transcoder);
+	len = min_t(int, sizeof(crtc_state->eld) / 4, eld_buffer_size);
+
+	for (i = 0; i < len; i++)
+		eld[i] = intel_de_read(i915, HSW_AUD_EDID_DATA(cpu_transcoder));
+}
+
 static void hsw_audio_codec_disable(struct intel_encoder *encoder,
 				    const struct intel_crtc_state *old_crtc_state,
 				    const struct drm_connector_state *old_conn_state)
@@ -700,6 +746,33 @@ static int ilk_eld_buffer_size(struct drm_i915_private *i915,
 	return REG_FIELD_GET(IBX_ELD_BUFFER_SIZE_MASK, tmp);
 }
 
+static void ilk_audio_codec_get_config(struct intel_encoder *encoder,
+				       struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	u32 *eld = (u32 *)crtc_state->eld;
+	enum port port = encoder->port;
+	enum pipe pipe = crtc->pipe;
+	int eld_buffer_size, len, i;
+	struct ilk_audio_regs regs;
+	u32 tmp;
+
+	ilk_audio_regs_init(i915, pipe, &regs);
+
+	tmp = intel_de_read(i915, regs.aud_cntrl_st2);
+	if ((tmp & IBX_ELD_VALID(port)) == 0)
+		return;
+
+	intel_de_rmw(i915, regs.aud_cntl_st, IBX_ELD_ADDRESS_MASK, 0);
+
+	eld_buffer_size = ilk_eld_buffer_size(i915, pipe);
+	len = min_t(int, sizeof(crtc_state->eld) / 4, eld_buffer_size);
+
+	for (i = 0; i < len; i++)
+		eld[i] = intel_de_read(i915, regs.hdmiw_hdmiedid);
+}
+
 static void ilk_audio_codec_disable(struct intel_encoder *encoder,
 				    const struct intel_crtc_state *old_crtc_state,
 				    const struct drm_connector_state *old_conn_state)
@@ -919,19 +992,34 @@ void intel_audio_codec_disable(struct intel_encoder *encoder,
 	intel_lpe_audio_notify(i915, pipe, port, NULL, 0, false);
 }
 
+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 = ilk_audio_codec_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 = hsw_audio_codec_get_config,
 };
 
 /**
diff --git a/drivers/gpu/drm/i915/display/intel_audio.h b/drivers/gpu/drm/i915/display/intel_audio.h
index b9070f336bcf..e35108b7dbc0 100644
--- a/drivers/gpu/drm/i915/display/intel_audio.h
+++ b/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);
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 971356237eca..d7f1bc75cf26 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3463,6 +3463,8 @@ 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,
-- 
2.35.1




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