ALSA: oxfw: add support for Miglia Harmony Audio
Miglia Technology ships Harmony Audio 2004. It uses Oxford Semiconductor
OXFW970 for communication function in IEEE 1394 bus. This commit adds
support for the model.
In my opinion, the firmware of ASIC is really the initial stage, since
it has the following quirks.
* It skips several isochronous cycles to transmit isochronous packets
when receiving any asynchronous transaction.
* The value of dbc field in the transmitted packet is the number of
accumulated quadlets in CIP payload, instead of the accumulated data
blocks. Furthermore, the value includes the quadlets of CIP payload in
the packet.
* It neither supports AV/C Stream Format Information command nor AV/C
Extended Stream Format Information command.
* The vendor and model information in root directory of configuration
ROM includes some mistakes.
Additionally, when operating at 96.0 kHz, it often skips much isochronous
cycles to transmit the isochronous packets. The issue is detected as cycle
discontinuity and ALSA PCM application receives -EIO at any operation for
PCM substream. I have never found any workaround yet.
$ config-rom-pretty-printer < /sys/bus/firewire/devices/fw1/config_rom
ROM header and bus information block
-----------------------------------------------------------------
1024
04249e04 bus_info_length 4, crc_length 36, crc 40452
1028
31333934 bus_name "1394"
1032
20ff5003 irmc 0, cmc 0, isc 1, bmc 0, cyc_clk_acc 255, max_rec 5 (64)
1036
0030e002 company_id 0030e0 |
1040
00454647 device_id
8594474567 | EUI-64
13757098081207879
root directory
-----------------------------------------------------------------
1044
00062d69 directory_length 6, crc 11625
1048
030030e0 vendor
1052
8100000a --> descriptor leaf at 1092
1056
1700f970 model
1060
81000011 --> descriptor leaf at 1128
1064
0c0083c0 node capabilities: per IEEE 1394
1068
d1000001 --> unit directory at 1072
unit directory at 1072
-----------------------------------------------------------------
1072
00046ff9 directory_length 4, crc 28665 (should be 43676)
1076
1200a02d specifier id
1080
13010001 version
1084
1700f970 model
1088
8100000f --> descriptor leaf at 1148
descriptor leaf at 1092
-----------------------------------------------------------------
1092
00085f8a leaf_length 8, crc 24458
1096
00000000 textual descriptor
1100
00000000 minimal ASCII
1104
4d69676c "Migl"
1108
69612054 "ia T"
1112
6563686e "echn"
1116
6f6c6f67 "olog"
1120
79204c74 "y Lt"
1124
642e0000 "d."
descriptor leaf at 1128
-----------------------------------------------------------------
1128
00040514 leaf_length 4, crc 1300
1132
00000000 textual descriptor
1136
00000000 minimal ASCII
1140
4f584657 "OXFW"
1144
20393730 " 970"
descriptor leaf at 1148
-----------------------------------------------------------------
1148
0005a1dc leaf_length 5, crc 41436
1152
00000000 textual descriptor
1156
00000000 minimal ASCII
1160
4861726d "Harm"
1164
6f6e7941 "onyA"
1168
7564696f "udio"
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20240218074128.95210-5-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>