Eric Lee / smarc-fsl-linux-kernel

11 May, 2011

1 commit

  • f30e6d3e4   firewire: octlet AT payloads can be stack-allocated ... Browse Code »

    We do not need slab allocations anymore in order to satisfy
    streaming DMA mapping constraints, thanks to commit da28947e7e36
    "firewire: ohci: avoid separate DMA mapping for small AT payloads".

    (Besides, the slab-allocated buffers that firewire-core, firewire-sbp2,
    and firedtv used to provide for 8-byte write and lock requests were
    still not fully portable since they crossed cacheline boundaries or
    shared a cacheline with unrelated CPU-accessed data. snd-firewire-lib
    got this aspect right by using an extra kmalloc/ kfree just for the
    8-byte transaction buffer.)

    This change replaces kmalloc'ed lock transaction scratch buffers in
    firewire-core, firedtv, and snd-firewire-lib by local stack allocations.
    Perhaps the most notable result of the change is simpler locking because
    there is no need to serialize usages of preallocated per-device buffers
    anymore. Also, allocations and deallocations are simpler.

    Signed-off-by: Stefan Richter
    Acked-by: Clemens Ladisch

    Stefan Richter
     

15 Mar, 2011

2 commits

  • 5b2599a07   ALSA: firewire-lib: allocate DMA buffer separately ... Browse Code »

    For correct cache coherency on some architectures, DMA buffers must be
    allocated in a different cache line than data that is concurrently used
    by the CPU.

    Signed-off-by: Clemens Ladisch
    Signed-off-by: Takashi Iwai

    Clemens Ladisch
     
  • 31ef9134e   ALSA: add LaCie FireWire Speakers/Griffin FireWave Surround driver ... Browse Code »

    Add a driver for two playback-only FireWire devices based on the OXFW970
    chip.

    v2: better AMDTP API abstraction; fix fw_unit leak; small fixes
    v3: cache the iPCR value
    v4: FireWave constraints; fix fw_device reference counting;
    fix PCR caching; small changes and fixes
    v5: volume/mute support; fix crashing due to pcm stop races
    v6: fix build; one-channel volume for LaCie
    v7: use signed values to make volume (range checks) work; fix function
    block IDs for volume/mute; always use channel 0 for LaCie volume

    Signed-off-by: Clemens Ladisch
    Acked-by: Stefan Richter
    Tested-by: Jay Fenlason
    Signed-off-by: Takashi Iwai

    Clemens Ladisch