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| author | Takashi Iwai <tiwai@suse.de> | 2022-04-21 08:41:00 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2022-04-21 10:17:17 +0200 |
| commit | 0f1f7a6661394fe4a53db254c346d6aa2dd64397 (patch) | |
| tree | 2689f84d3117cd31af33e088ed11862b4b7ca796 /Documentation/sound | |
| parent | faf5933c79545412ea63f0c3d15c261d104e1dde (diff) | |
| download | linux-stable-0f1f7a6661394fe4a53db254c346d6aa2dd64397.tar.gz linux-stable-0f1f7a6661394fe4a53db254c346d6aa2dd64397.tar.bz2 linux-stable-0f1f7a6661394fe4a53db254c346d6aa2dd64397.zip | |
ALSA: usb-audio: Add quirk bits for enabling/disabling generic implicit fb
For making easier to test, add the new quirk_flags bits 17 and 18 to
enable and disable the generic implicit feedback mode. The bit 17 is
equivalent with implicit_fb=1 option, applying the generic implicit
feedback sync mode. OTOH, the bit 18 disables the implicit fb mode
forcibly.
Link: https://lore.kernel.org/r/20220421064101.12456-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/sound')
| -rw-r--r-- | Documentation/sound/alsa-configuration.rst | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/sound/alsa-configuration.rst b/Documentation/sound/alsa-configuration.rst index 34888d4fc4a8..21ab5e6f7062 100644 --- a/Documentation/sound/alsa-configuration.rst +++ b/Documentation/sound/alsa-configuration.rst @@ -2246,7 +2246,7 @@ implicit_fb Apply the generic implicit feedback sync mode. When this is set and the playback stream sync mode is ASYNC, the driver tries to tie an adjacent ASYNC capture stream as the implicit feedback - source. + source. This is equivalent with quirk_flags bit 17. use_vmalloc Use vmalloc() for allocations of the PCM buffers (default: yes). For architectures with non-coherent memory like ARM or MIPS, the @@ -2288,6 +2288,8 @@ quirk_flags * 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 This module supports multiple devices, autoprobe and hotplugging. |