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ALSA: oxfw: fix functional regression for Mackie Onyx 1640i in v5.14 or later 

A user reports functional regression for Mackie Onyx 1640i that the device
generates slow sound with ALSA oxfw driver which supports media clock
recovery. Although the device is based on OXFW971 ASIC, it does not
transfer isochronous packet with own event frequency as expected. The
device seems to adjust event frequency according to events in received
isochronous packets in the beginning of packet streaming. This is
unknown quirk.

This commit fixes the regression to turn the recovery off in driver
side. As a result, nominal frequency is used in duplex packet streaming
between device and driver. For stability of sampling rate in events of
transferred isochronous packet, 4,000 isochronous packets are skipped
in the beginning of packet streaming.

Reference: https://github.com/takaswie/snd-firewire-improve/issues/38
Fixes: 029ffc4294 ("ALSA: oxfw: perform sequence replay for media clock recovery")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20211028130325.45772-1-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2021-10-28 22:03:25 +09:00 committed by Takashi Iwai
parent 407359d44e
commit cddcd5472a
3 changed files with 19 additions and 1 deletions
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7
sound/firewire/oxfw/oxfw-stream.c
View File

@ -9,7 +9,7 @@
#include <linux/delay.h>
#define AVC_GENERIC_FRAME_MAXIMUM_BYTES 512
#define READY_TIMEOUT_MS 200
#define READY_TIMEOUT_MS 600
/*
* According to datasheet of Oxford Semiconductor:
@ -367,6 +367,11 @@ int snd_oxfw_stream_start_duplex(struct snd_oxfw *oxfw)
// Just after changing sampling transfer frequency, many cycles are
// skipped for packet transmission.
tx_init_skip_cycles = 400;
} else if (oxfw->quirks & SND_OXFW_QUIRK_VOLUNTARY_RECOVERY) {
// It takes a bit time for target device to adjust event frequency
// according to nominal event frequency in isochronous packets from
// ALSA oxfw driver.
tx_init_skip_cycles = 4000;
} else {
replay_seq = true;
}

8
sound/firewire/oxfw/oxfw.c
View File

@ -25,6 +25,7 @@
#define MODEL_SATELLITE 0x00200f
#define MODEL_SCS1M 0x001000
#define MODEL_DUET_FW 0x01dddd
#define MODEL_ONYX_1640I 0x001640
#define SPECIFIER_1394TA 0x00a02d
#define VERSION_AVC 0x010001
@ -192,6 +193,13 @@ static int detect_quirks(struct snd_oxfw *oxfw, const struct ieee1394_device_id
// OXFW971-based models may transfer events by blocking method.
if (!(oxfw->quirks & SND_OXFW_QUIRK_JUMBO_PAYLOAD))
oxfw->quirks |= SND_OXFW_QUIRK_BLOCKING_TRANSMISSION;
if (model == MODEL_ONYX_1640I) {
//Unless receiving packets without NOINFO packet, the device transfers
//mostly half of events in packets than expected.
oxfw->quirks |= SND_OXFW_QUIRK_IGNORE_NO_INFO_PACKET |
SND_OXFW_QUIRK_VOLUNTARY_RECOVERY;
}
}
return 0;

5
sound/firewire/oxfw/oxfw.h
View File

@ -47,6 +47,11 @@ enum snd_oxfw_quirk {
// the device to process audio data even if the value is invalid in a point of
// IEC 61883-1/6.
SND_OXFW_QUIRK_IGNORE_NO_INFO_PACKET = 0x10,
// Loud Technologies Mackie Onyx 1640i seems to configure OXFW971 ASIC so that it decides
// event frequency according to events in received isochronous packets. The device looks to
// performs media clock recovery voluntarily. In the recovery, the packets with NO_INFO
// are ignored, thus driver should transfer packets with timestamp.
SND_OXFW_QUIRK_VOLUNTARY_RECOVERY = 0x20,
};
/* This is an arbitrary number for convinience. */