5259293240
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>
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|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
README
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.