[Intel-gfx] [PATCH 19/22] drm/i915/sdvo: Do ELD hardware readout

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Read out the ELD from the hw so the state checker can verify it.

Cc: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Cc: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_sdvo.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c b/drivers/gpu/drm/i915/display/intel_sdvo.c
index d9a54ed4623a..b2884fdc2b1c 100644
--- a/drivers/gpu/drm/i915/display/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/display/intel_sdvo.c
@@ -1185,6 +1185,21 @@ static void intel_sdvo_get_avi_infoframe(struct intel_sdvo *intel_sdvo,
 			      frame->any.type, HDMI_INFOFRAME_TYPE_AVI);
 }
 
+static void intel_sdvo_get_eld(struct intel_sdvo *intel_sdvo,
+			       struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(intel_sdvo->base.base.dev);
+	ssize_t len;
+
+	if (!crtc_state->has_audio)
+		return;
+
+	len = intel_sdvo_read_infoframe(intel_sdvo, SDVO_HBUF_INDEX_ELD,
+					crtc_state->eld, sizeof(crtc_state->eld));
+	if (len < 0)
+		drm_dbg_kms(&i915->drm, "failed to read ELD\n");
+}
+
 static bool intel_sdvo_set_tv_format(struct intel_sdvo *intel_sdvo,
 				     const struct drm_connector_state *conn_state)
 {
@@ -1744,6 +1759,8 @@ static void intel_sdvo_get_config(struct intel_encoder *encoder,
 	}
 
 	intel_sdvo_get_avi_infoframe(intel_sdvo, pipe_config);
+
+	intel_sdvo_get_eld(intel_sdvo, pipe_config);
 }
 
 static void intel_sdvo_disable_audio(struct intel_sdvo *intel_sdvo)
-- 
2.35.1