This patch is tested OK on G45/HDMI and IbexPeak/HDMI. DisplayPort is tested on several IbexPeak and Sandybridge boxes, however not working, possibly due to hardware/monitor problems.
FYI, here is an example ELD dump in G45/HDMI.
wfg@slim ~% cat /proc/asound/card0/eld#1.0 monitor_present 1 eld_valid 1 monitor_name RX-V1800 connection_type HDMI eld_version [0x2] CEA-861D or below edid_version [0x3] CEA-861-B, C or D manufacture_id 0xa865 product_id 0x3116 port_id 0x0 support_hdcp 0 support_ai 1 audio_sync_delay 0 speakers [0x5f] FL/FR LFE FC RL/RR RC RLC/RRC sad_count 8 sad0_coding_type [0x1] LPCM sad0_channels 2 sad0_rates [0x1ee0] 44100 48000 88200 176400 192000 384000 sad0_bits [0xe0000] 16 20 24 sad1_coding_type [0x1] LPCM sad1_channels 8 sad1_rates [0x1ee0] 44100 48000 88200 176400 192000 384000 sad1_bits [0xe0000] 16 20 24 sad2_coding_type [0x2] AC-3 sad2_channels 6 sad2_rates [0xe0] 44100 48000 88200 sad2_max_bitrate 640000 sad3_coding_type [0x7] DTS sad3_channels 7 sad3_rates [0x6e0] 44100 48000 88200 176400 192000 sad3_max_bitrate 1536000 sad4_coding_type [0x9] DSD (One Bit Audio) sad4_channels 6 sad4_rates [0x40] 48000 sad5_coding_type [0xa] E-AC-3/DD+ (Dolby Digital Plus) sad5_channels 8 sad5_rates [0xc0] 48000 88200 sad6_coding_type [0xc] MLP (Dolby TrueHD) sad6_channels 8 sad6_rates [0x1480] 88200 192000 sad7_coding_type [0xb] DTS-HD sad7_channels 8 sad7_rates [0x1480] 88200 192000
Thanks, Fengguang