OpenCloudOS-Kernel/sound/usb/usbaudio.h

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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __USBAUDIO_H
#define __USBAUDIO_H
/*
* (Tentative) USB Audio Driver for ALSA
*
* Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
*/
/* handling of USB vendor/product ID pairs as 32-bit numbers */
#define USB_ID(vendor, product) (((unsigned int)(vendor) << 16) | (product))
#define USB_ID_VENDOR(id) ((id) >> 16)
#define USB_ID_PRODUCT(id) ((u16)(id))
/*
*
*/
media: sound/usb: Use Media Controller API to share media resources Media Device Allocator API to allows multiple drivers share a media device. This API solves a very common use-case for media devices where one physical device (an USB stick) provides both audio and video. When such media device exposes a standard USB Audio class, a proprietary Video class, two or more independent drivers will share a single physical USB bridge. In such cases, it is necessary to coordinate access to the shared resource. Using this API, drivers can allocate a media device with the shared struct device as the key. Once the media device is allocated by a driver, other drivers can get a reference to it. The media device is released when all the references are released. Change the ALSA driver to use the Media Controller API to share media resources with DVB, and V4L2 drivers on a AU0828 media device. The Media Controller specific initialization is done after sound card is registered. ALSA creates Media interface and entity function graph nodes for Control, Mixer, PCM Playback, and PCM Capture devices. snd_usb_hw_params() will call Media Controller enable source handler interface to request the media resource. If resource request is granted, it will release it from snd_usb_hw_free(). If resource is busy, -EBUSY is returned. Media specific cleanup is done in usb_audio_disconnect(). Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Shuah Khan <shuah@kernel.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
2019-04-02 08:40:22 +08:00
struct media_device;
struct media_intf_devnode;
#define MAX_CARD_INTERFACES 16
struct snd_usb_audio {
int index;
struct usb_device *dev;
struct snd_card *card;
struct usb_interface *intf[MAX_CARD_INTERFACES];
u32 usb_id;
ALSA: usb-audio: Disable USB autosuspend properly in setup_disable_autosuspend() Rear audio on Lenovo ThinkStation P620 stops working after commit 1965c4364bdd ("ALSA: usb-audio: Disable autosuspend for Lenovo ThinkStation P620"): [ 6.013526] usbcore: registered new interface driver snd-usb-audio [ 6.023064] usb 3-6: cannot get ctl value: req = 0x81, wValue = 0x100, wIndex = 0x0, type = 1 [ 6.023083] usb 3-6: cannot get ctl value: req = 0x81, wValue = 0x202, wIndex = 0x0, type = 4 [ 6.023090] usb 3-6: cannot get ctl value: req = 0x81, wValue = 0x100, wIndex = 0x0, type = 1 [ 6.023098] usb 3-6: cannot get ctl value: req = 0x81, wValue = 0x202, wIndex = 0x0, type = 4 [ 6.023103] usb 3-6: cannot get ctl value: req = 0x81, wValue = 0x100, wIndex = 0x0, type = 1 [ 6.023110] usb 3-6: cannot get ctl value: req = 0x81, wValue = 0x202, wIndex = 0x0, type = 4 [ 6.045846] usb 3-6: cannot get ctl value: req = 0x81, wValue = 0x100, wIndex = 0x0, type = 1 [ 6.045866] usb 3-6: cannot get ctl value: req = 0x81, wValue = 0x202, wIndex = 0x0, type = 4 [ 6.045877] usb 3-6: cannot get ctl value: req = 0x81, wValue = 0x100, wIndex = 0x0, type = 1 [ 6.045886] usb 3-6: cannot get ctl value: req = 0x81, wValue = 0x202, wIndex = 0x0, type = 4 [ 6.045894] usb 3-6: cannot get ctl value: req = 0x81, wValue = 0x100, wIndex = 0x0, type = 1 [ 6.045908] usb 3-6: cannot get ctl value: req = 0x81, wValue = 0x202, wIndex = 0x0, type = 4 I overlooked the issue because when I was working on the said commit, only the front audio is tested. Apology for that. Changing supports_autosuspend in driver is too late for disabling autosuspend, because it was already used by USB probe routine, so it can break the balance on the following code that depends on supports_autosuspend. Fix it by using usb_disable_autosuspend() helper, and balance the suspend count in disconnect callback. Fixes: 1965c4364bdd ("ALSA: usb-audio: Disable autosuspend for Lenovo ThinkStation P620") Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20210304043419.287191-1-kai.heng.feng@canonical.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-03-04 12:34:16 +08:00
uint16_t quirk_type;
struct mutex mutex;
ALSA: usb-audio: Fix inconsistent card PM state after resume When a USB-audio interface gets runtime-suspended via auto-pm feature, the driver suspends all functionality and increment chip->num_suspended_intf. Later on, when the system gets suspended to S3, the driver increments chip->num_suspended_intf again, skips the device changes, and sets the card power state to SNDRV_CTL_POWER_D3hot. In return, when the system gets resumed from S3, the resume callback decrements chip->num_suspended_intf. Since this refcount is still not zero (it's been runtime-suspended), the whole resume is skipped. But there is a small pitfall here. The problem is that the driver doesn't restore the card power state after this resume call, leaving it as SNDRV_CTL_POWER_D3hot. So, even after the system resume finishes, the card instance still appears as if it were system-suspended, and this confuses many ioctl accesses that are blocked unexpectedly. In details, we have two issues behind the scene: one is that the card power state is changed only when the refcount becomes zero, and another is that the prior auto-suspend check is kept in a boolean flag. Although the latter problem is almost negligible since the auto-pm feature is imposed only on the primary interface, but this can be a potential problem on the devices with multiple interfaces. This patch addresses those issues by the following: - Replace chip->autosuspended boolean flag with chip->system_suspend counter - At the first system-suspend, chip->num_suspended_intf is recorded to chip->system_suspend - At system-resume, the card power state is restored when the chip->num_suspended_intf refcount reaches to chip->system_suspend, i.e. the state returns to the auto-suspended Also, the patch fixes yet another hidden problem by the code refactoring along with the fixes above: namely, when some resume procedure failed, the driver left chip->num_suspended_intf that was already decreased, and it might lead to the refcount unbalance. In the new code, the refcount decrement is done after the whole resume procedure, and the problem is avoided as well. Fixes: 0662292aec05 ("ALSA: usb-audio: Handle normal and auto-suspend equally") Reported-and-tested-by: Macpaul Lin <macpaul.lin@mediatek.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20200603153709.6293-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
2020-06-03 23:37:08 +08:00
unsigned int system_suspend;
ALSA: usb-audio: Avoid nested autoresume calls After the recent fix of runtime PM for USB-audio driver, we got a lockdep warning like: ============================================= [ INFO: possible recursive locking detected ] 4.2.0-rc8+ #61 Not tainted --------------------------------------------- pulseaudio/980 is trying to acquire lock: (&chip->shutdown_rwsem){.+.+.+}, at: [<ffffffffa0355dac>] snd_usb_autoresume+0x1d/0x52 [snd_usb_audio] but task is already holding lock: (&chip->shutdown_rwsem){.+.+.+}, at: [<ffffffffa0355dac>] snd_usb_autoresume+0x1d/0x52 [snd_usb_audio] This comes from snd_usb_autoresume() invoking down_read() and it's used in a nested way. Although it's basically safe, per se (as these are read locks), it's better to reduce such spurious warnings. The read lock is needed to guarantee the execution of "shutdown" (cleanup at disconnection) task after all concurrent tasks are finished. This can be implemented in another better way. Also, the current check of chip->in_pm isn't good enough for protecting the racy execution of multiple auto-resumes. This patch rewrites the logic of snd_usb_autoresume() & co; namely, - The recursive call of autopm is avoided by the new refcount, chip->active. The chip->in_pm flag is removed accordingly. - Instead of rwsem, another refcount, chip->usage_count, is introduced for tracking the period to delay the shutdown procedure. At the last clear of this refcount, wake_up() to the shutdown waiter is called. - The shutdown flag is replaced with shutdown atomic count; this is for reducing the lock. - Two new helpers are introduced to simplify the management of these refcounts; snd_usb_lock_shutdown() increases the usage_count, checks the shutdown state, and does autoresume. snd_usb_unlock_shutdown() does the opposite. Most of mixer and other codes just need this, and simply returns an error if it receives an error from lock. Fixes: 9003ebb13f61 ('ALSA: usb-audio: Fix runtime PM unbalance') Reported-and-tested-by: Alexnader Kuleshov <kuleshovmail@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-08-25 22:09:00 +08:00
atomic_t active;
atomic_t shutdown;
atomic_t usage_count;
wait_queue_head_t shutdown_wait;
unsigned int quirk_flags;
unsigned int need_delayed_register:1; /* warn for delayed registration */
int num_interfaces;
int last_iface;
int num_suspended_intf;
int sample_rate_read_error;
int badd_profile; /* UAC3 BADD profile */
struct list_head pcm_list; /* list of pcm streams */
struct list_head ep_list; /* list of audio-related endpoints */
struct list_head iface_ref_list; /* list of interface refcounts */
struct list_head clock_ref_list; /* list of clock refcounts */
int pcm_devs;
unsigned int num_rawmidis; /* number of created rawmidi devices */
struct list_head midi_list; /* list of midi interfaces */
ALSA: usb-audio: USB MIDI 2.0 UMP support This patch provides a basic support for USB MIDI 2.0. As of this patch, the driver creates a UMP device per MIDI I/O endpoints, which serves as a dumb terminal to read/write UMP streams. A new Kconfig CONFIG_SND_USB_AUDIO_MIDI_V2 manages whether to enable or disable the MIDI 2.0 support. Also, the driver provides a new module option, midi2_enable, to allow disabling the MIDI 2.0 at runtime, too. When MIDI 2.0 support is disabled, the driver tries to fall back to the already existing MIDI 1.0 device (each MIDI 2.0 device is supposed to provide the MIDI 1.0 interface at the altset 0). For now, the driver doesn't manage any MIDI-CI or other protocol setups by itself, but relies on the default protocol given via the group terminal block descriptors. The MIDI 1.0 messages on MIDI 2.0 device will be automatically converted in ALSA sequencer in a later patch. As of this commit, the driver accepts merely the rawmidi UMP accesses. The driver builds up the topology in the following way: - Create an object for each MIDI endpoint belonging to the USB interface - Find MIDI EP "pairs" that share the same GTB; note that MIDI EP is unidirectional, while UMP is (normally) bidirectional, so two MIDI EPs can form a single UMP EP - A UMP endpoint object is created for each I/O pair - For remaining "solo" MIDI EPs, create unidirectional UMP EPs - Finally, parse GTBs and fill the protocol bits on each UMP So the driver may support multiple UMP Endpoints in theory, although most devices are supposed to have a single UMP EP that can contain up to 16 groups -- which should be large enough. Reviewed-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/20230523075358.9672-10-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
2023-05-23 15:53:30 +08:00
struct list_head midi_v2_list; /* list of MIDI 2 interfaces */
struct list_head mixer_list; /* list of mixer interfaces */
int setup; /* from the 'device_setup' module param */
bool generic_implicit_fb; /* from the 'implicit_fb' module param */
bool autoclock; /* from the 'autoclock' module param */
bool lowlatency; /* from the 'lowlatency' module param */
struct usb_host_interface *ctrl_intf; /* the audio control interface */
media: sound/usb: Use Media Controller API to share media resources Media Device Allocator API to allows multiple drivers share a media device. This API solves a very common use-case for media devices where one physical device (an USB stick) provides both audio and video. When such media device exposes a standard USB Audio class, a proprietary Video class, two or more independent drivers will share a single physical USB bridge. In such cases, it is necessary to coordinate access to the shared resource. Using this API, drivers can allocate a media device with the shared struct device as the key. Once the media device is allocated by a driver, other drivers can get a reference to it. The media device is released when all the references are released. Change the ALSA driver to use the Media Controller API to share media resources with DVB, and V4L2 drivers on a AU0828 media device. The Media Controller specific initialization is done after sound card is registered. ALSA creates Media interface and entity function graph nodes for Control, Mixer, PCM Playback, and PCM Capture devices. snd_usb_hw_params() will call Media Controller enable source handler interface to request the media resource. If resource request is granted, it will release it from snd_usb_hw_free(). If resource is busy, -EBUSY is returned. Media specific cleanup is done in usb_audio_disconnect(). Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Shuah Khan <shuah@kernel.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
2019-04-02 08:40:22 +08:00
struct media_device *media_dev;
struct media_intf_devnode *ctl_intf_media_devnode;
};
#define USB_AUDIO_IFACE_UNUSED ((void *)-1L)
#define usb_audio_err(chip, fmt, args...) \
dev_err(&(chip)->dev->dev, fmt, ##args)
#define usb_audio_err_ratelimited(chip, fmt, args...) \
dev_err_ratelimited(&(chip)->dev->dev, fmt, ##args)
#define usb_audio_warn(chip, fmt, args...) \
dev_warn(&(chip)->dev->dev, fmt, ##args)
#define usb_audio_info(chip, fmt, args...) \
dev_info(&(chip)->dev->dev, fmt, ##args)
#define usb_audio_dbg(chip, fmt, args...) \
dev_dbg(&(chip)->dev->dev, fmt, ##args)
/*
* Information about devices with broken descriptors
*/
/* special values for .ifnum */
#define QUIRK_NODEV_INTERFACE -3 /* return -ENODEV */
#define QUIRK_NO_INTERFACE -2
#define QUIRK_ANY_INTERFACE -1
enum quirk_type {
QUIRK_IGNORE_INTERFACE,
QUIRK_COMPOSITE,
QUIRK_AUTODETECT,
QUIRK_MIDI_STANDARD_INTERFACE,
QUIRK_MIDI_FIXED_ENDPOINT,
QUIRK_MIDI_YAMAHA,
QUIRK_MIDI_ROLAND,
QUIRK_MIDI_MIDIMAN,
QUIRK_MIDI_NOVATION,
QUIRK_MIDI_RAW_BYTES,
QUIRK_MIDI_EMAGIC,
QUIRK_MIDI_CME,
QUIRK_MIDI_AKAI,
QUIRK_MIDI_US122L,
QUIRK_MIDI_FTDI,
QUIRK_MIDI_CH345,
QUIRK_AUDIO_STANDARD_INTERFACE,
QUIRK_AUDIO_FIXED_ENDPOINT,
QUIRK_AUDIO_EDIROL_UAXX,
QUIRK_AUDIO_STANDARD_MIXER,
QUIRK_TYPE_COUNT
};
struct snd_usb_audio_quirk {
const char *vendor_name;
const char *product_name;
int16_t ifnum;
uint16_t type;
const void *data;
};
#define combine_word(s) ((*(s)) | ((unsigned int)(s)[1] << 8))
#define combine_triple(s) (combine_word(s) | ((unsigned int)(s)[2] << 16))
#define combine_quad(s) (combine_triple(s) | ((unsigned int)(s)[3] << 24))
ALSA: usb-audio: Avoid nested autoresume calls After the recent fix of runtime PM for USB-audio driver, we got a lockdep warning like: ============================================= [ INFO: possible recursive locking detected ] 4.2.0-rc8+ #61 Not tainted --------------------------------------------- pulseaudio/980 is trying to acquire lock: (&chip->shutdown_rwsem){.+.+.+}, at: [<ffffffffa0355dac>] snd_usb_autoresume+0x1d/0x52 [snd_usb_audio] but task is already holding lock: (&chip->shutdown_rwsem){.+.+.+}, at: [<ffffffffa0355dac>] snd_usb_autoresume+0x1d/0x52 [snd_usb_audio] This comes from snd_usb_autoresume() invoking down_read() and it's used in a nested way. Although it's basically safe, per se (as these are read locks), it's better to reduce such spurious warnings. The read lock is needed to guarantee the execution of "shutdown" (cleanup at disconnection) task after all concurrent tasks are finished. This can be implemented in another better way. Also, the current check of chip->in_pm isn't good enough for protecting the racy execution of multiple auto-resumes. This patch rewrites the logic of snd_usb_autoresume() & co; namely, - The recursive call of autopm is avoided by the new refcount, chip->active. The chip->in_pm flag is removed accordingly. - Instead of rwsem, another refcount, chip->usage_count, is introduced for tracking the period to delay the shutdown procedure. At the last clear of this refcount, wake_up() to the shutdown waiter is called. - The shutdown flag is replaced with shutdown atomic count; this is for reducing the lock. - Two new helpers are introduced to simplify the management of these refcounts; snd_usb_lock_shutdown() increases the usage_count, checks the shutdown state, and does autoresume. snd_usb_unlock_shutdown() does the opposite. Most of mixer and other codes just need this, and simply returns an error if it receives an error from lock. Fixes: 9003ebb13f61 ('ALSA: usb-audio: Fix runtime PM unbalance') Reported-and-tested-by: Alexnader Kuleshov <kuleshovmail@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-08-25 22:09:00 +08:00
int snd_usb_lock_shutdown(struct snd_usb_audio *chip);
void snd_usb_unlock_shutdown(struct snd_usb_audio *chip);
extern bool snd_usb_use_vmalloc;
extern bool snd_usb_skip_validation;
/*
* Driver behavior quirk flags, stored in chip->quirk_flags
*
* QUIRK_FLAG_GET_SAMPLE_RATE:
* Skip reading sample rate for devices, as some devices behave inconsistently
* or return error
* QUIRK_FLAG_SHARE_MEDIA_DEVICE:
* Create Media Controller API entries
* QUIRK_FLAG_ALIGN_TRANSFER:
* Allow alignment on audio sub-slot (channel samples) rather than on audio
* slots (audio frames)
* QUIRK_TX_LENGTH:
* Add length specifier to transfers
* QUIRK_FLAG_PLAYBACK_FIRST:
* Start playback stream at first even in implement feedback mode
* QUIRK_FLAG_SKIP_CLOCK_SELECTOR:
* Skip clock selector setup; the device may reset to invalid state
* QUIRK_FLAG_IGNORE_CLOCK_SOURCE:
* Ignore errors from clock source search; i.e. hardcoded clock
* QUIRK_FLAG_ITF_USB_DSD_DAC:
* Indicates the device is for ITF-USB DSD based DACs that need a vendor cmd
* to switch between PCM and native DSD mode
* QUIRK_FLAG_CTL_MSG_DELAY:
* Add a delay of 20ms at each control message handling
* QUIRK_FLAG_CTL_MSG_DELAY_1M:
* Add a delay of 1-2ms at each control message handling
* QUIRK_FLAG_CTL_MSG_DELAY_5M:
* Add a delay of 5-6ms at each control message handling
* QUIRK_FLAG_IFACE_DELAY:
* Add a delay of 50ms at each interface setup
* QUIRK_FLAG_VALIDATE_RATES:
* Perform sample rate validations at probe
* QUIRK_FLAG_DISABLE_AUTOSUSPEND:
* Disable runtime PM autosuspend
* QUIRK_FLAG_IGNORE_CTL_ERROR:
* Ignore errors for mixer access
* QUIRK_FLAG_DSD_RAW:
* Support generic DSD raw U32_BE format
* QUIRK_FLAG_SET_IFACE_FIRST:
* Set up the interface at first like UAC1
* QUIRK_FLAG_GENERIC_IMPLICIT_FB
* Apply the generic implicit feedback sync mode (same as implicit_fb=1 option)
* QUIRK_FLAG_SKIP_IMPLICIT_FB
* Don't apply implicit feedback sync mode
* QUIRK_FLAG_IFACE_SKIP_CLOSE
* Don't closed interface during setting sample rate
ALSA: usb-audio: Add quirk for Tascam Model 12 Tascam's Model 12 is a mixer which can also operate as a USB audio interface. The audio interface uses explicit feedback but it seems that it does not correctly handle missing isochronous frames. When injecting an xrun (or doing anything else that pauses the playback stream) the feedback rate climbs (for example, at 44,100Hz nominal, I see a stable rate around 44,099 but xrun injection sees this peak at around 44,135 in most cases) and glitches are heard in the audio stream for several seconds - this is significantly worse than the single glitch expected for an underrun. While the stream does normally recover and the feedback rate returns to a stable value, I have seen some occurrences where this does not happen and the rate continues to increase while no audio is heard from the output. I have not found a solid reproduction for this. This misbehaviour can be avoided by totally resetting the stream state by switching the interface to alt 0 and back before restarting the playback stream. Add a new quirk flag which forces the endpoint and interface to be reconfigured whenever the stream is stopped, and use this for the Tascam Model 12. Separate interfaces are used for the playback and capture endpoints, so resetting the playback interface here will not affect the capture stream if it is running. While there are two endpoints on the interface, these are the OUT data endpoint and the IN explicit feedback endpoint corresponding to it and these are always stopped and started together. Signed-off-by: John Keeping <john@metanate.com> Link: https://lore.kernel.org/r/20221129130100.1257904-1-john@metanate.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2022-11-29 21:00:59 +08:00
* QUIRK_FLAG_FORCE_IFACE_RESET
* Force an interface reset whenever stopping & restarting a stream
* (e.g. after xrun)
* QUIRK_FLAG_FIXED_RATE
* Do not set PCM rate (frequency) when only one rate is available
* for the given endpoint.
*/
#define QUIRK_FLAG_GET_SAMPLE_RATE (1U << 0)
#define QUIRK_FLAG_SHARE_MEDIA_DEVICE (1U << 1)
#define QUIRK_FLAG_ALIGN_TRANSFER (1U << 2)
#define QUIRK_FLAG_TX_LENGTH (1U << 3)
#define QUIRK_FLAG_PLAYBACK_FIRST (1U << 4)
#define QUIRK_FLAG_SKIP_CLOCK_SELECTOR (1U << 5)
#define QUIRK_FLAG_IGNORE_CLOCK_SOURCE (1U << 6)
#define QUIRK_FLAG_ITF_USB_DSD_DAC (1U << 7)
#define QUIRK_FLAG_CTL_MSG_DELAY (1U << 8)
#define QUIRK_FLAG_CTL_MSG_DELAY_1M (1U << 9)
#define QUIRK_FLAG_CTL_MSG_DELAY_5M (1U << 10)
#define QUIRK_FLAG_IFACE_DELAY (1U << 11)
#define QUIRK_FLAG_VALIDATE_RATES (1U << 12)
#define QUIRK_FLAG_DISABLE_AUTOSUSPEND (1U << 13)
#define QUIRK_FLAG_IGNORE_CTL_ERROR (1U << 14)
#define QUIRK_FLAG_DSD_RAW (1U << 15)
#define QUIRK_FLAG_SET_IFACE_FIRST (1U << 16)
#define QUIRK_FLAG_GENERIC_IMPLICIT_FB (1U << 17)
#define QUIRK_FLAG_SKIP_IMPLICIT_FB (1U << 18)
#define QUIRK_FLAG_IFACE_SKIP_CLOSE (1U << 19)
ALSA: usb-audio: Add quirk for Tascam Model 12 Tascam's Model 12 is a mixer which can also operate as a USB audio interface. The audio interface uses explicit feedback but it seems that it does not correctly handle missing isochronous frames. When injecting an xrun (or doing anything else that pauses the playback stream) the feedback rate climbs (for example, at 44,100Hz nominal, I see a stable rate around 44,099 but xrun injection sees this peak at around 44,135 in most cases) and glitches are heard in the audio stream for several seconds - this is significantly worse than the single glitch expected for an underrun. While the stream does normally recover and the feedback rate returns to a stable value, I have seen some occurrences where this does not happen and the rate continues to increase while no audio is heard from the output. I have not found a solid reproduction for this. This misbehaviour can be avoided by totally resetting the stream state by switching the interface to alt 0 and back before restarting the playback stream. Add a new quirk flag which forces the endpoint and interface to be reconfigured whenever the stream is stopped, and use this for the Tascam Model 12. Separate interfaces are used for the playback and capture endpoints, so resetting the playback interface here will not affect the capture stream if it is running. While there are two endpoints on the interface, these are the OUT data endpoint and the IN explicit feedback endpoint corresponding to it and these are always stopped and started together. Signed-off-by: John Keeping <john@metanate.com> Link: https://lore.kernel.org/r/20221129130100.1257904-1-john@metanate.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2022-11-29 21:00:59 +08:00
#define QUIRK_FLAG_FORCE_IFACE_RESET (1U << 20)
#define QUIRK_FLAG_FIXED_RATE (1U << 21)
#endif /* __USBAUDIO_H */