drm/i915: Enable HDMI audio for monitor with audio support

Rely on monitor's audio capability to turn on audio output for HDMI.

Tested-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 9fb9501f2d07..2d918dc046ef 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -42,6 +42,7 @@ struct intel_hdmi {
         u32 sdvox_reg;
         int ddc_bus;
         bool has_hdmi_sink;
+        bool has_audio;
 };
 
 static struct intel_hdmi *enc_to_intel_hdmi(struct drm_encoder *encoder)
@@ -72,11 +73,12 @@ static void intel_hdmi_mode_set(struct drm_encoder *encoder,
         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
                 sdvox |= SDVO_HSYNC_ACTIVE_HIGH;
 
-        if (intel_hdmi->has_hdmi_sink) {
+        /* Required on CPT */
+        if (intel_hdmi->has_hdmi_sink && HAS_PCH_CPT(dev))
+                sdvox |= HDMI_MODE_SELECT;
+
+        if (intel_hdmi->has_audio)
                 sdvox |= SDVO_AUDIO_ENABLE;
-                if (HAS_PCH_CPT(dev))
-                        sdvox |= HDMI_MODE_SELECT;
-        }
 
         if (intel_crtc->pipe == 1) {
                 if (HAS_PCH_CPT(dev))
@@ -154,6 +156,7 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
         enum drm_connector_status status = connector_status_disconnected;
 
         intel_hdmi->has_hdmi_sink = false;
+        intel_hdmi->has_audio = false;
         edid = drm_get_edid(connector,
                             &dev_priv->gmbus[intel_hdmi->ddc_bus].adapter);
 
@@ -161,6 +164,7 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
                 if (edid->input & DRM_EDID_INPUT_DIGITAL) {
                         status = connector_status_connected;
                         intel_hdmi->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
+                        intel_hdmi->has_audio = drm_detect_monitor_audio(edid);
                 }
                 connector->display_info.raw_edid = NULL;
                 kfree(edid);