ALSA: hda - hdmi: Add ELD emulation for ATI/AMD codecs

ATI/AMD HDMI/DP codecs do not include standard HDA ELD (EDID-like data)
support.

In place of providing access to an ELD buffer, various vendor-specific
verbs are provided to provide the relevant information. Revision ID 3
and later (0x100300 as reported by procfs codec#X) have support for
providing more information than the previous revisions (but only if
supported by the display driver).

Generate ELD from the information provided by the vendor-specific verbs
on ATI/AMD codecs.

The specification is available at:
http://www.x.org/docs/AMD/AMD_HDA_verbs_v2.pdf

v2: moved code to hda_eld.c and cleaned it up
v3: adapted to hdmi_ops infrastructure

Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
Tested-by: Peter Frühberger <fritsch@xbmc.org> # v2
Tested-by: Olivier Langlois <olivier@trillion01.com> # v2
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 9 insertions, 0 deletions

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 1114be018e5a..0307ae87bef3 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -2821,6 +2821,14 @@ static int patch_nvhdmi_8ch_7x(struct hda_codec *codec)
 #define ATI_MULTICHANNEL_MODE_PAIRED    0
 #define ATI_MULTICHANNEL_MODE_SINGLE    1
 
+static int atihdmi_pin_get_eld(struct hda_codec *codec, hda_nid_t nid,
+                           unsigned char *buf, int *eld_size)
+{
+        /* call hda_eld.c ATI/AMD-specific function */
+        return snd_hdmi_get_eld_ati(codec, nid, buf, eld_size,
+                                    is_amdhdmi_rev3_or_later(codec));
+}
+
 static void atihdmi_pin_setup_infoframe(struct hda_codec *codec, hda_nid_t pin_nid, int ca,
                                         int active_channels, int conn_type)
 {
@@ -3048,6 +3056,7 @@ static int patch_atihdmi(struct hda_codec *codec)
 
         spec = codec->spec;
 
+        spec->ops.pin_get_eld = atihdmi_pin_get_eld;
         spec->ops.pin_get_slot_channel = atihdmi_pin_get_slot_channel;
         spec->ops.pin_set_slot_channel = atihdmi_pin_set_slot_channel;
         spec->ops.pin_setup_infoframe = atihdmi_pin_setup_infoframe;