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  1. 21 Nov, 2012 2 commits
  2. 17 Nov, 2012 1 commit
  3. 08 Nov, 2012 1 commit
  4. 27 Sep, 2012 1 commit
  5. 19 Sep, 2012 1 commit
  6. 04 Sep, 2012 1 commit
    • Daniel Mack's avatar
      ALSA: snd-usb: Add quirks for Playback Designs devices · 2b58fd5b
      Daniel Mack authored
      Playback Designs' USB devices have some hardware limitations on their
      USB interface. In particular:
       - They need a 20ms delay after each class compliant request as the
         hardware ACKs the USB packets before the device is actually ready
         for the next command. Sending data immediately will result in buffer
         overflows in the hardware.
       - The devices send bogus feedback data at the start of each stream
         which confuse the feedback format auto-detection.
      This patch introduces a new quirks hook that is called after each
      control packet and which adds a delay for all devices that match
      Playback Designs' USB VID for now.
      In addition, it adds a counter to snd_usb_endpoint to drop received
      packets on the floor. Another new quirks function that is called once
      an endpoint is started initializes that counter for these devices on
      their sync endpoint.
      Signed-off-by: default avatarDaniel Mack <>
      Reported-and-tested-by: default avatarAndreas Koch <>
      Supported-by: default avatarDemian Martin <>
      Signed-off-by: default avatarTakashi Iwai <>
  7. 31 Aug, 2012 1 commit
    • Daniel Mack's avatar
      ALSA: snd-usb: fix calls to next_packet_size · 245baf98
      Daniel Mack authored
      In order to support devices with implicit feedback streaming models,
      packet sizes are now stored with each individual urb, and the PCM
      handling code which fills the buffers purely relies on the size fields
      However, calling snd_usb_audio_next_packet_size() for all possible
      packets in an URB at once, prior to letting the PCM code do its job
      does in fact not lead to the same behaviour than what the old code did:
      The PCM code will break its loop once a period boundary is reached,
      consequently using up less packets that it really could.
      As snd_usb_audio_next_packet_size() implements a feedback mechanism to
      the endpoints phase accumulator, the number of calls to that function
      matters, and when called too often, the data rate runs out of bounds.
      Fix this by making the next_packet function public, and call it from the
      PCM code as before if the packet data sizes are not defined.
      Signed-off-by: default avatarDaniel Mack <>
      Cc: [v3.5+]
      Signed-off-by: default avatarTakashi Iwai <>
  8. 30 Aug, 2012 1 commit
    • Daniel Mack's avatar
      ALSA: snd-usb: Fix URB cancellation at stream start · 015618b9
      Daniel Mack authored
      Commit e9ba389c
       ("ALSA: usb-audio: Fix scheduling-while-atomic bug in
      PCM capture stream") fixed a scheduling-while-atomic bug that happened
      when snd_usb_endpoint_start was called from the trigger callback, which
      is an atmic context. However, the patch breaks the idea of the endpoints
      reference counting, which is the reason why the driver has been
      refactored lately.
      Revert that commit and let snd_usb_endpoint_start() take care of the URB
      cancellation again. As this function is called from both atomic and
      non-atomic context, add a flag to denote whether the function may sleep.
      Signed-off-by: default avatarDaniel Mack <>
      Cc: [3.5+]
      Signed-off-by: default avatarTakashi Iwai <>
  9. 16 Aug, 2012 1 commit
  10. 13 Jul, 2012 1 commit
  11. 24 Apr, 2012 2 commits
  12. 13 Apr, 2012 6 commits
  13. 09 Jan, 2012 1 commit
  14. 14 Sep, 2011 2 commits
  15. 04 Aug, 2011 1 commit
  16. 12 Jul, 2011 1 commit
  17. 03 Sep, 2010 1 commit
    • Clemens Ladisch's avatar
      ALSA: usb-audio: fix detection of vendor-specific device protocol settings · a2acad82
      Clemens Ladisch authored
      The Audio Class v2 support code in 2.6.35 added checks for the
      bInterfaceProtocol field.  However, there are devices (usually those
      detected by vendor-specific quirks) that do not have one of the
      predefined values in this field, which made the driver reject them.
      To fix this regression, restore the old behaviour, i.e., assume that
      a device with an unknown bInterfaceProtocol field (other than
      UAC_VERSION_2) has more or less UAC-v1-compatible descriptors.
      [compile warning fixes by tiwai]
      Signed-off-by: default avatarClemens Ladisch <>
      Cc: Daniel Mack <>
      Cc: <>
      Signed-off-by: default avatarTakashi Iwai <>
  18. 02 Sep, 2010 1 commit
  19. 23 Jun, 2010 2 commits
  20. 21 Jun, 2010 1 commit
  21. 31 May, 2010 1 commit
    • Daniel Mack's avatar
      ALSA: usb-audio: parse clock topology of UAC2 devices · 79f920fb
      Daniel Mack authored
      Audio devices which comply to the UAC2 standard can export complex clock
      topologies in its descriptors and set up links between them.
      The entities that are defined are
       - clock sources, which define the end-leafs.
       - clock selectors, which act as switch to select one out of many
         possible clocks sources.
       - clock multipliers, which have an input clock source, and act as clock
         source again. They can be used to derive one clock from another.
      All sample rate changes, clock validity queries and the like must go to
      clock source elements, while clock selectors and multipliers can be used
      as terminal clock source.
      The following patch adds a parser for these elements and functions to
      iterate over the tree and find the leaf nodes (clock sources).
      The samplerate set functions were moved to the new clock.c file.
      Signed-off-by: default avatarDaniel Mack <>
      Signed-off-by: default avatarTakashi Iwai <>
  22. 27 May, 2010 2 commits
  23. 29 Mar, 2010 1 commit
  24. 25 Mar, 2010 1 commit
  25. 12 Mar, 2010 1 commit
  26. 05 Mar, 2010 3 commits