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| author | Takashi Iwai <tiwai@suse.de> | 2020-03-30 09:46:51 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2020-03-30 09:46:51 +0200 |
| commit | aa21c3d4b941739651e77747d2f7a20a6c1d87bc (patch) | |
| tree | ae46596c4fe5803fbd4746459a09a09cff5487e8 /Documentation/sound | |
| parent | 476c02e0b4fd9071d158f6a1a1dfea1d36ee0ffd (diff) | |
| parent | 652bb5d8df4b3a79ed350db35cda12637e63efa7 (diff) | |
| download | linux-aa21c3d4b941739651e77747d2f7a20a6c1d87bc.tar.bz2 | |
Merge branch 'for-next' into for-linus
Diffstat (limited to 'Documentation/sound')
| -rw-r--r-- | Documentation/sound/alsa-configuration.rst | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/sound/alsa-configuration.rst b/Documentation/sound/alsa-configuration.rst index 392875a1b94e..72f97d4b01a7 100644 --- a/Documentation/sound/alsa-configuration.rst +++ b/Documentation/sound/alsa-configuration.rst @@ -2234,6 +2234,19 @@ use_vmalloc buffers. If mmap is used on such architectures, turn off this option, so that the DMA-coherent buffers are allocated and used instead. +delayed_register + The option is needed for devices that have multiple streams + defined in multiple USB interfaces. The driver may invoke + registrations multiple times (once per interface) and this may + lead to the insufficient device enumeration. + This option receives an array of strings, and you can pass + ID:INTERFACE like ``0123abcd:4`` for performing the delayed + registration to the given device. In this example, when a USB + device 0123:abcd is probed, the driver waits the registration + until the USB interface 4 gets probed. + The driver prints a message like "Found post-registration device + assignment: 1234abcd:04" for such a device, so that user can + notice the need. This module supports multiple devices, autoprobe and hotplugging. |