drm/i915: Enable DP audio for Haswell

This patch adds the missing code to send ELD for Haswell DisplayPort,
based on Xingchao's original patch.

A test was performed with HSW-D machine and NEC EA232Wmi DP monitor.

Cc: Xingchao Wang <xingchao.wang@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 58f50ebdbef6..d706d538e8b7 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -669,6 +669,15 @@ static void intel_ddi_mode_set(struct drm_encoder *encoder,
                         break;
                 }
 
+                if (intel_dp->has_audio) {
+                        DRM_DEBUG_DRIVER("DP audio on pipe %c on DDI\n",
+                                         pipe_name(intel_crtc->pipe));
+
+                        /* write eld */
+                        DRM_DEBUG_DRIVER("DP audio: write eld information\n");
+                        intel_write_eld(encoder, adjusted_mode);
+                }
+
                 intel_dp_init_link_config(intel_dp);
 
         } else if (type == INTEL_OUTPUT_HDMI) {