[PATCH 2/5] hda-spec: Add access to secret node 0x8 for Haswell/Broadwell HDMI

[David Henningsson <david.henningsson@canonical.com>]

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
---
 hda-spec.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/hda-spec.c b/hda-spec.c
index 0ff0388..fa21cf5 100644
--- a/hda-spec.c
+++ b/hda-spec.c
@@ -575,6 +575,18 @@ static void fixup_alc268_beep(struct xhda_codec *codec)
 	node->amp_in_caps.override = 1;
 }
 
+static int haswell_ext_cmd(struct xhda_codec *codec, unsigned int cmd)
+{
+	unsigned int nid = (cmd >> 20) & 0x7f;
+
+	codec->rc = 0;
+
+	/* Secret Haswell node on 0x8, used to turn on DP1.2 features */
+	if (nid == 0x8)
+		return 0;
+	return -ENXIO;
+}
+
 static void fixup_haswellhdmi(struct xhda_codec *codec)
 {
 	struct xhda_node *node;
@@ -602,6 +614,8 @@ static void fixup_haswellhdmi(struct xhda_codec *codec)
 			node->node[0] = 0x2;
 		}
 	}
+
+	codec->extended_cmd = haswell_ext_cmd;
 }
 
 struct fixup_list {
-- 
1.9.1