On Sun, 20 May 2018 07:40:44 +0200, Takashi Sakamoto wrote:
TC Electronic Digital Konnekt x32 is an application of WaveFront DiceII STD and doesn't support TCAT extended application protocol. For such devices, ALSA dice driver needs to have hard-coded parameters for stream formats.
This commit adds stream format parameters for this model. Unfortunately, at sampling transmission frequencies of 88.2/96.0kHz, I confirmed that current ALSA dice driver doesn't drive the device appropriately due to detecting packet discontinuities.
$ journalctl kernel: snd_dice fw1.0: Detect discontinuity of CIP: 90 80
At the frequencies, the device transfers 16 data blocks per packet and 16 data channels per data block, as a result one packet includes 1032 bytes if it's not NODATA. However, as long as I checked, the device often postpone packet transmission and continue with truncated payload than metadata in isochronous packet header. Below is a sample of sequence I got.
sec cycle bytes CIP1 CIP2 37 3314 1032 0x01100090 0x900449E2 37 3315 8 0x011000A0 0x9004FFFF 37 3316 1032 0x011000A0 0x900461E2 37 3317 1032 0x011000B0 0x900475E2 37 3318 1032 0x011000C0 0x900489E2 37 3319 8 0x011000D0 0x9004FFFF 37 3320 1032 0x011000D0 0x9004A1E2 37 3321 1032 0x011000E0 0x9004B5E2 37 3322 1032 0x011000F0 0x9004C9E2 37 3323 8 0x01100000 0x9004FFFF 37 3324 1032 0x01100000 0x9004E1E2 37 3325 1032 0x01100010 0x9004F5E2 37 3326 1032 0x01100020 0x900409E2 37 3327 8 0x01100030 0x9004FFFF 37 3328 1032 0x01100030 0x900421E2 37 3329 1032 0x01100040 0x900435E2 37 3330 (skip) 37 3331 (skip) 37 3332 (skip) 37 3333 (skip) 37 3334 (skip) 37 3335 (skip) 37 3336 (skip) 37 3337 (skip) 37 3338 (skip) 37 3339 (skip) 37 3340 (skip) 37 3341 (skip) 37 3342 (skip) 37 3343 (skip) 37 3344 (skip) 37 3345 (skip) 37 3346 (skip) 37 3347 (skip) 37 3348 (skip) 37 3349 (skip) 37 3350 (skip) 37 3351 (skip) 37 3352 (skip) 37 3353 (skip) 37 3354 (skip) 37 3355 (skip) 37 3356 (skip) 37 3357 (skip) 37 3358 (skip) 37 3359 (skip) 37 3360 (skip) 37 3361 (skip) 37 3362 (skip) 37 3363 (skip) 37 3364 (skip) 37 3365 (skip) 37 3366 (skip) 37 3367 1032 0x01100050 0x900461E1 37 3368 1032 0x01100060 0x900475E1 37 3369 1032 0x01100070 0x9004A1E1 37 3370 1032 0x01100080 0x9004A1E1 but content of payload is truncated. 37 3371 (skip) 37 3371 1032 0x01100080 0x9004B5E0 detect discontinuity 37 3372 1032 0x01100090 0x9004C9E0 37 3373 1032 0x011000A0 0x9004E1E0 37 3374 1032 0x011000B0 0x9004F5E0 37 3375 1032 0x011000C0 0x900409E0 37 3376 1032 0x011000D0 0x900421E0 37 3377 1032 0x011000E0 0x900435E0 37 3378 1032 0x011000F0 0x900449DF 37 3379 8 0x01100000 0x9004FFFF 37 3380 1032 0x01100000 0x900461DF 37 3381 1032 0x01100010 0x900475DF 37 3382 1032 0x01100020 0x900489DF 37 3383 8 0x01100030 0x9004FFFF 37 3384 1032 0x01100030 0x9004A1DF 37 3385 1032 0x01100040 0x9004B5DF 37 3386 1032 0x01100050 0x9004C9DF 37 3387 8 0x01100060 0x9004FFFF
I cannot confirm this quirks with Windows driver. ALSA dice driver has a cause if assumed differences between these two drivers are ways of timestampling to RX packets from the drivers to the device. I've already reported timestamping quirk of Dice-based devices and this might bring this issue.
[alsa-devel] Dice packet sequence quirk and ALSA firewire stack in Linux 4.6 http://mailman.alsa-project.org/pipermail/alsa-devel/2016-May/107715.html
Well, nevertheless, I enable ALSA dice driver to work at the frequencies. This may brings inconvenience to users but I expect developers and users to fix it.
$ cd linux-firewire-utils/src $ python2 crpp < /sys/bus/firewire/devices/fw1/config_rom ROM header and bus information block ----------------------------------------------------------------- 400 040423bb bus_info_length 4, crc_length 4, crc 9147 404 31333934 bus_name "1394" 408 e0ff8112 irmc 1, cmc 1, isc 1, bmc 0, pmc 0, cyc_clk_acc 255, max_rec 8 (512), max_rom 1, gen 1, spd 2 (S400) 40c 00016604 company_id 000166 | 410 0c232c28 device_id 040c232c28 | EUI-64 000166040c232c28
root directory -----------------------------------------------------------------414 0006b6cb directory_length 6, crc 46795 418 03000166 vendor 41c 8100000a --> descriptor leaf at 444 420 17000030 model 424 8100000f --> descriptor leaf at 460 428 0c0087c0 node capabilities per IEEE 1394 42c d1000001 --> unit directory at 430
unit directory at 430 -----------------------------------------------------------------430 000476c2 directory_length 4, crc 30402 434 12000166 specifier id 438 13000001 version 43c 17000030 model 440 81000010 --> descriptor leaf at 480
descriptor leaf at 444 -----------------------------------------------------------------444 0006c490 leaf_length 6, crc 50320 448 00000000 textual descriptor 44c 00000000 minimal ASCII 450 54432045 "TC E" 454 6c656374 "lect" 458 726f6e69 "roni" 45c 63000000 "c"
descriptor leaf at 460 -----------------------------------------------------------------460 000772b4 leaf_length 7, crc 29364 464 00000000 textual descriptor 468 00000000 minimal ASCII 46c 44696769 "Digi" 470 74616c4b "talK" 474 6f6e6e65 "onne" 478 6b747833 "ktx3" 47c 32000000 "2"
descriptor leaf at 480 -----------------------------------------------------------------480 000772b4 leaf_length 7, crc 29364 484 00000000 textual descriptor 488 00000000 minimal ASCII 48c 44696769 "Digi" 490 74616c4b "talK" 494 6f6e6e65 "onne" 498 6b747833 "ktx3" 49c 32000000 "2"
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp
Applied, thanks.
Takashi