From: Cryolitia PukNgae <cryolitia@uniontech.com>
Just briefly described about the option.
Signed-off-by: Cryolitia PukNgae <cryolitia@uniontech.com>
---
Documentation/sound/alsa-configuration.rst | 108 ++++++++++++++++++++---------
1 file changed, 75 insertions(+), 33 deletions(-)
diff --git a/Documentation/sound/alsa-configuration.rst b/Documentation/sound/alsa-configuration.rst
index a2fb8ed251dd0294e7a62209ca15d5c32c6adfae..efffe3d534beeddcb6a47ac27a24defb6879f534 100644
--- a/Documentation/sound/alsa-configuration.rst
+++ b/Documentation/sound/alsa-configuration.rst
@@ -2297,39 +2297,81 @@ skip_validation
of the unit descriptor instead of a driver probe error, so that we
can check its details.
quirk_flags
- Contains the bit flags for various device specific workarounds.
- Applied to the corresponding card index.
-
- * bit 0: Skip reading sample rate for devices
- * bit 1: Create Media Controller API entries
- * bit 2: Allow alignment on audio sub-slot at transfer
- * bit 3: Add length specifier to transfers
- * bit 4: Start playback stream at first in implement feedback mode
- * bit 5: Skip clock selector setup
- * bit 6: Ignore errors from clock source search
- * bit 7: Indicates ITF-USB DSD based DACs
- * bit 8: Add a delay of 20ms at each control message handling
- * bit 9: Add a delay of 1-2ms at each control message handling
- * bit 10: Add a delay of 5-6ms at each control message handling
- * bit 11: Add a delay of 50ms at each interface setup
- * bit 12: Perform sample rate validations at probe
- * bit 13: Disable runtime PM autosuspend
- * bit 14: Ignore errors for mixer access
- * bit 15: Support generic DSD raw U32_BE format
- * bit 16: Set up the interface at first like UAC1
- * bit 17: Apply the generic implicit feedback sync mode
- * bit 18: Don't apply implicit feedback sync mode
- * bit 19: Don't closed interface during setting sample rate
- * bit 20: Force an interface reset whenever stopping & restarting
- a stream
- * bit 21: Do not set PCM rate (frequency) when only one rate is
- available for the given endpoint.
- * bit 22: Set the fixed resolution 16 for Mic Capture Volume
- * bit 23: Set the fixed resolution 384 for Mic Capture Volume
- * bit 24: Set minimum volume control value as mute for devices
- where the lowest playback value represents muted state instead
- of minimum audible volume
- * bit 25: Be similar to bit 24 but for capture streams
+ The option provides a refined and flexible control for applying quirk
+ flags. It allows to specify the quirk flags for each device, and could
+ be modified dynamically via sysfs.
+ The old usage accepts an array of integers, each of which apply quirk
+ flags on the device in the order of probing.
+ e.g. ``quirk_flags=0x01,0x02`` applies get_sample_rate to the first
+ device, and share_media_device to the second device.
+ The new usage accepts a string in the format of
+ ``VID1:PID1:FLAGS1;VID2:PID2:FLAGS2;...``, where ``VIDx`` and ``PIDx``
+ specify the device, and ``FLAGSx`` specify the flags to be applied.
+ ``VIDx`` and ``PIDx`` are 4-digit hexadecimal numbers, and could be
+ specified as ``*`` to match any value. ``FLAGSx`` could be a set of
+ flags given by name, separated by ``|``, or a hexadecimal number
+ representing the bit flags. The available flag names are listed above.
+ An exclamation mark could be prefixed to a flag name to negate the flag.
+ For example, ``1234:abcd:mixer_playback_min_mute|!ignore_ctl_error;*:*:0x01;``
+ applies the ``mixer_playback_min_mute`` flag and clears the
+ ``ignore_ctl_error`` flag for the device 1234:abcd, and applies the
+ ``skip_sample_rate`` flag for all devices.
+
+ * bit 0: ``get_sample_rate``
+ Skip reading sample rate for devices
+ * bit 1: ``share_media_device``
+ Create Media Controller API entries
+ * bit 2: ``align_transfer``
+ Allow alignment on audio sub-slot at transfer
+ * bit 3: ``tx_length``
+ Add length specifier to transfers
+ * bit 4: ``playback_first``
+ Start playback stream at first in implement feedback mode
+ * bit 5: ``skip_clock_selector``
+ Skip clock selector setup
+ * bit 6: ``ignore_clock_source``
+ Ignore errors from clock source search
+ * bit 7: ``itf_usb_dsd_dac``
+ Indicates ITF-USB DSD based DACs
+ * bit 8: ``ctl_msg_delay``
+ Add a delay of 20ms at each control message handling
+ * bit 9: ``ctl_msg_delay_1m``
+ Add a delay of 1-2ms at each control message handling
+ * bit 10: ``ctl_msg_delay_5m``
+ Add a delay of 5-6ms at each control message handling
+ * bit 11: ``iface_delay``
+ Add a delay of 50ms at each interface setup
+ * bit 12: ``validate_rates``
+ Perform sample rate validations at probe
+ * bit 13: ``disable_autosuspend``
+ Disable runtime PM autosuspend
+ * bit 14: ``ignore_ctl_error``
+ Ignore errors for mixer access
+ * bit 15: ``dsd_raw``
+ Support generic DSD raw U32_BE format
+ * bit 16: ``set_iface_first``
+ Set up the interface at first like UAC1
+ * bit 17: ``generic_implicit_fb``
+ Apply the generic implicit feedback sync mode
+ * bit 18: ``skip_implicit_fb``
+ Don't apply implicit feedback sync mode
+ * bit 19: ``iface_skip_close``
+ Don't closed interface during setting sample rate
+ * bit 20: ``force_iface_reset``
+ Force an interface reset whenever stopping & restarting a stream
+ * bit 21: ``fixed_rate``
+ Do not set PCM rate (frequency) when only one rate is available
+ for the given endpoint
+ * bit 22: ``mic_res_16``
+ Set the fixed resolution 16 for Mic Capture Volume
+ * bit 23: ``mic_res_384``
+ Set the fixed resolution 384 for Mic Capture Volume
+ * bit 24: ``mixer_playback_min_mute``
+ Set minimum volume control value as mute for devices where the
+ lowest playback value represents muted state instead of minimum
+ audible volume
+ * bit 25: ``mixer_capture_min_mute``
+ Be similar to bit 24 but for capture streams
This module supports multiple devices, autoprobe and hotplugging.
--
2.51.0Hi--
On 9/18/25 2:24 AM, Cryolitia PukNgae via B4 Relay wrote:
> From: Cryolitia PukNgae <cryolitia@uniontech.com>
>
> Just briefly described about the option.
>
> Signed-off-by: Cryolitia PukNgae <cryolitia@uniontech.com>
> ---
> Documentation/sound/alsa-configuration.rst | 108 ++++++++++++++++++++---------
> 1 file changed, 75 insertions(+), 33 deletions(-)
>
> diff --git a/Documentation/sound/alsa-configuration.rst b/Documentation/sound/alsa-configuration.rst
> index a2fb8ed251dd0294e7a62209ca15d5c32c6adfae..efffe3d534beeddcb6a47ac27a24defb6879f534 100644
> --- a/Documentation/sound/alsa-configuration.rst
> +++ b/Documentation/sound/alsa-configuration.rst
> @@ -2297,39 +2297,81 @@ skip_validation
> of the unit descriptor instead of a driver probe error, so that we
> can check its details.
> quirk_flags
> - Contains the bit flags for various device specific workarounds.
> - Applied to the corresponding card index.
> -
> - * bit 0: Skip reading sample rate for devices
> - * bit 1: Create Media Controller API entries
> - * bit 2: Allow alignment on audio sub-slot at transfer
> - * bit 3: Add length specifier to transfers
> - * bit 4: Start playback stream at first in implement feedback mode
> - * bit 5: Skip clock selector setup
> - * bit 6: Ignore errors from clock source search
> - * bit 7: Indicates ITF-USB DSD based DACs
> - * bit 8: Add a delay of 20ms at each control message handling
> - * bit 9: Add a delay of 1-2ms at each control message handling
> - * bit 10: Add a delay of 5-6ms at each control message handling
> - * bit 11: Add a delay of 50ms at each interface setup
> - * bit 12: Perform sample rate validations at probe
> - * bit 13: Disable runtime PM autosuspend
> - * bit 14: Ignore errors for mixer access
> - * bit 15: Support generic DSD raw U32_BE format
> - * bit 16: Set up the interface at first like UAC1
> - * bit 17: Apply the generic implicit feedback sync mode
> - * bit 18: Don't apply implicit feedback sync mode
> - * bit 19: Don't closed interface during setting sample rate
> - * bit 20: Force an interface reset whenever stopping & restarting
> - a stream
> - * bit 21: Do not set PCM rate (frequency) when only one rate is
> - available for the given endpoint.
> - * bit 22: Set the fixed resolution 16 for Mic Capture Volume
> - * bit 23: Set the fixed resolution 384 for Mic Capture Volume
> - * bit 24: Set minimum volume control value as mute for devices
> - where the lowest playback value represents muted state instead
> - of minimum audible volume
> - * bit 25: Be similar to bit 24 but for capture streams
> + The option provides a refined and flexible control for applying quirk
> + flags. It allows to specify the quirk flags for each device, and could
and may
or: and can
> + be modified dynamically via sysfs.
> + The old usage accepts an array of integers, each of which apply quirk
applies
> + flags on the device in the order of probing.
> + e.g. ``quirk_flags=0x01,0x02`` applies get_sample_rate to the first
E.g.,
> + device, and share_media_device to the second device.
> + The new usage accepts a string in the format of
> + ``VID1:PID1:FLAGS1;VID2:PID2:FLAGS2;...``, where ``VIDx`` and ``PIDx``
> + specify the device, and ``FLAGSx`` specify the flags to be applied.
> + ``VIDx`` and ``PIDx`` are 4-digit hexadecimal numbers, and could be
s/could/may/
> + specified as ``*`` to match any value. ``FLAGSx`` could be a set of
s/could/may/
> + flags given by name, separated by ``|``, or a hexadecimal number
> + representing the bit flags. The available flag names are listed above.
s/above/below/ ?
> + An exclamation mark could be prefixed to a flag name to negate the flag.
s/could/may/
> + For example, ``1234:abcd:mixer_playback_min_mute|!ignore_ctl_error;*:*:0x01;``
What happens if the trailing (ending) ';' is omitted?
> + applies the ``mixer_playback_min_mute`` flag and clears the
> + ``ignore_ctl_error`` flag for the device 1234:abcd, and applies the
> + ``skip_sample_rate`` flag for all devices.
> +
> + * bit 0: ``get_sample_rate``
> + Skip reading sample rate for devices
get vs Skip is a little confusing.
> + * bit 1: ``share_media_device``
> + Create Media Controller API entries
> + * bit 2: ``align_transfer``
> + Allow alignment on audio sub-slot at transfer
> + * bit 3: ``tx_length``
> + Add length specifier to transfers
> + * bit 4: ``playback_first``
> + Start playback stream at first in implement feedback mode
> + * bit 5: ``skip_clock_selector``
> + Skip clock selector setup
> + * bit 6: ``ignore_clock_source``
> + Ignore errors from clock source search
> + * bit 7: ``itf_usb_dsd_dac``
> + Indicates ITF-USB DSD based DACs
DSD-based
> + * bit 8: ``ctl_msg_delay``
> + Add a delay of 20ms at each control message handling
> + * bit 9: ``ctl_msg_delay_1m``
> + Add a delay of 1-2ms at each control message handling
> + * bit 10: ``ctl_msg_delay_5m``
> + Add a delay of 5-6ms at each control message handling
> + * bit 11: ``iface_delay``
> + Add a delay of 50ms at each interface setup
> + * bit 12: ``validate_rates``
> + Perform sample rate validations at probe
> + * bit 13: ``disable_autosuspend``
> + Disable runtime PM autosuspend
> + * bit 14: ``ignore_ctl_error``
> + Ignore errors for mixer access
> + * bit 15: ``dsd_raw``
> + Support generic DSD raw U32_BE format
> + * bit 16: ``set_iface_first``
> + Set up the interface at first like UAC1
> + * bit 17: ``generic_implicit_fb``
> + Apply the generic implicit feedback sync mode
> + * bit 18: ``skip_implicit_fb``
> + Don't apply implicit feedback sync mode
> + * bit 19: ``iface_skip_close``
> + Don't closed interface during setting sample rate
close
> + * bit 20: ``force_iface_reset``
> + Force an interface reset whenever stopping & restarting a stream
> + * bit 21: ``fixed_rate``
> + Do not set PCM rate (frequency) when only one rate is available
> + for the given endpoint
> + * bit 22: ``mic_res_16``
> + Set the fixed resolution 16 for Mic Capture Volume
> + * bit 23: ``mic_res_384``
> + Set the fixed resolution 384 for Mic Capture Volume
> + * bit 24: ``mixer_playback_min_mute``
> + Set minimum volume control value as mute for devices where the
> + lowest playback value represents muted state instead of minimum
> + audible volume
> + * bit 25: ``mixer_capture_min_mute``
> + Be similar to bit 24 but for capture streams
Similar to
>
> This module supports multiple devices, autoprobe and hotplugging.
>
> Are all of these quirks used on various devices or are some of these
just implemented just in case they are needed in the future?thanks.
--
~Randy
Thanks for your review. I'll waiting some reviews on other patches and resend a new version about it. On 19/09/2025 04.21, Randy Dunlap wrote: > Hi-- > > On 9/18/25 2:24 AM, Cryolitia PukNgae via B4 Relay wrote: >> From: Cryolitia PukNgae <cryolitia@uniontech.com> >> >> Just briefly described about the option. >> >> Signed-off-by: Cryolitia PukNgae <cryolitia@uniontech.com> >> --- >> Documentation/sound/alsa-configuration.rst | 108 ++++++++++++++++++++--------- >> 1 file changed, 75 insertions(+), 33 deletions(-) >> >> diff --git a/Documentation/sound/alsa-configuration.rst b/Documentation/sound/alsa-configuration.rst >> index a2fb8ed251dd0294e7a62209ca15d5c32c6adfae..efffe3d534beeddcb6a47ac27a24defb6879f534 100644 >> --- a/Documentation/sound/alsa-configuration.rst >> +++ b/Documentation/sound/alsa-configuration.rst >> @@ -2297,39 +2297,81 @@ skip_validation >> of the unit descriptor instead of a driver probe error, so that we >> can check its details. >> quirk_flags >> - Contains the bit flags for various device specific workarounds. >> - Applied to the corresponding card index. >> - >> - * bit 0: Skip reading sample rate for devices >> - * bit 1: Create Media Controller API entries >> - * bit 2: Allow alignment on audio sub-slot at transfer >> - * bit 3: Add length specifier to transfers >> - * bit 4: Start playback stream at first in implement feedback mode >> - * bit 5: Skip clock selector setup >> - * bit 6: Ignore errors from clock source search >> - * bit 7: Indicates ITF-USB DSD based DACs >> - * bit 8: Add a delay of 20ms at each control message handling >> - * bit 9: Add a delay of 1-2ms at each control message handling >> - * bit 10: Add a delay of 5-6ms at each control message handling >> - * bit 11: Add a delay of 50ms at each interface setup >> - * bit 12: Perform sample rate validations at probe >> - * bit 13: Disable runtime PM autosuspend >> - * bit 14: Ignore errors for mixer access >> - * bit 15: Support generic DSD raw U32_BE format >> - * bit 16: Set up the interface at first like UAC1 >> - * bit 17: Apply the generic implicit feedback sync mode >> - * bit 18: Don't apply implicit feedback sync mode >> - * bit 19: Don't closed interface during setting sample rate >> - * bit 20: Force an interface reset whenever stopping & restarting >> - a stream >> - * bit 21: Do not set PCM rate (frequency) when only one rate is >> - available for the given endpoint. >> - * bit 22: Set the fixed resolution 16 for Mic Capture Volume >> - * bit 23: Set the fixed resolution 384 for Mic Capture Volume >> - * bit 24: Set minimum volume control value as mute for devices >> - where the lowest playback value represents muted state instead >> - of minimum audible volume >> - * bit 25: Be similar to bit 24 but for capture streams >> + The option provides a refined and flexible control for applying quirk >> + flags. It allows to specify the quirk flags for each device, and could > > and may > or: and can > >> + be modified dynamically via sysfs. >> + The old usage accepts an array of integers, each of which apply quirk > > applies > >> + flags on the device in the order of probing. >> + e.g. ``quirk_flags=0x01,0x02`` applies get_sample_rate to the first > > E.g., > >> + device, and share_media_device to the second device. >> + The new usage accepts a string in the format of >> + ``VID1:PID1:FLAGS1;VID2:PID2:FLAGS2;...``, where ``VIDx`` and ``PIDx`` >> + specify the device, and ``FLAGSx`` specify the flags to be applied. >> + ``VIDx`` and ``PIDx`` are 4-digit hexadecimal numbers, and could be > > s/could/may/ > >> + specified as ``*`` to match any value. ``FLAGSx`` could be a set of > > s/could/may/ > >> + flags given by name, separated by ``|``, or a hexadecimal number >> + representing the bit flags. The available flag names are listed above. > > s/above/below/ ? > >> + An exclamation mark could be prefixed to a flag name to negate the flag. > s/could/may/ > >> + For example, ``1234:abcd:mixer_playback_min_mute|!ignore_ctl_error;*:*:0x01;`` > > What happens if the trailing (ending) ';' is omitted? This is where I found something strange when I was testing it myself. When I use `echo '*:*:mixer_playback_min_mute` > /sys/module/snd_usb_audio/parameters/quirk_flags`, the string received by the driver contains a lot of trailing spaces. I am not familiar with the kernel and don't know how to handle this situation. Simply adding a semicolon to the input will make the trailing spaces after the semicolon be ignored. > >> + applies the ``mixer_playback_min_mute`` flag and clears the >> + ``ignore_ctl_error`` flag for the device 1234:abcd, and applies the >> + ``skip_sample_rate`` flag for all devices. >> + >> + * bit 0: ``get_sample_rate`` >> + Skip reading sample rate for devices > > get vs Skip is a little confusing. This part is copied from Takashi Iwai[1]. It does a little confusing. >> + * bit 1: ``share_media_device`` >> + Create Media Controller API entries >> + * bit 2: ``align_transfer`` >> + Allow alignment on audio sub-slot at transfer >> + * bit 3: ``tx_length`` >> + Add length specifier to transfers >> + * bit 4: ``playback_first`` >> + Start playback stream at first in implement feedback mode >> + * bit 5: ``skip_clock_selector`` >> + Skip clock selector setup >> + * bit 6: ``ignore_clock_source`` >> + Ignore errors from clock source search >> + * bit 7: ``itf_usb_dsd_dac`` >> + Indicates ITF-USB DSD based DACs > > DSD-based > >> + * bit 8: ``ctl_msg_delay`` >> + Add a delay of 20ms at each control message handling >> + * bit 9: ``ctl_msg_delay_1m`` >> + Add a delay of 1-2ms at each control message handling >> + * bit 10: ``ctl_msg_delay_5m`` >> + Add a delay of 5-6ms at each control message handling >> + * bit 11: ``iface_delay`` >> + Add a delay of 50ms at each interface setup >> + * bit 12: ``validate_rates`` >> + Perform sample rate validations at probe >> + * bit 13: ``disable_autosuspend`` >> + Disable runtime PM autosuspend >> + * bit 14: ``ignore_ctl_error`` >> + Ignore errors for mixer access >> + * bit 15: ``dsd_raw`` >> + Support generic DSD raw U32_BE format >> + * bit 16: ``set_iface_first`` >> + Set up the interface at first like UAC1 >> + * bit 17: ``generic_implicit_fb`` >> + Apply the generic implicit feedback sync mode >> + * bit 18: ``skip_implicit_fb`` >> + Don't apply implicit feedback sync mode >> + * bit 19: ``iface_skip_close`` >> + Don't closed interface during setting sample rate > > close > >> + * bit 20: ``force_iface_reset`` >> + Force an interface reset whenever stopping & restarting a stream >> + * bit 21: ``fixed_rate`` >> + Do not set PCM rate (frequency) when only one rate is available >> + for the given endpoint >> + * bit 22: ``mic_res_16`` >> + Set the fixed resolution 16 for Mic Capture Volume >> + * bit 23: ``mic_res_384`` >> + Set the fixed resolution 384 for Mic Capture Volume >> + * bit 24: ``mixer_playback_min_mute`` >> + Set minimum volume control value as mute for devices where the >> + lowest playback value represents muted state instead of minimum >> + audible volume >> + * bit 25: ``mixer_capture_min_mute`` >> + Be similar to bit 24 but for capture streams > > Similar to > >> >> This module supports multiple devices, autoprobe and hotplugging. >> >> Are all of these quirks used on various devices or are some of these > just implemented just in case they are needed in the future?thanks. I believe in that all of them are used in quirk_flags_table in sound/usb/quirks.c 1. https://lore.kernel.org/all/20210729073855.19043-2-tiwai@suse.de/ Best regards, Cryolitia
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