Set of patches to fix issues with hw_ptr fuzziness [1] and increased buffering w/ DSPs
1. disable rewinds to allow for new HDaudio SPIB DMA functionality (fetch up to the application pointer, rewinds not supported) 2. report max in-flight bytes to avoid problems with stale data (late wake-ups, rewinds)
[1] http://mailman.alsa-project.org/pipermail/alsa-devel/2015-June/093646.html
TODO: 1. fixes and alsa-lib updates (compile-tested only for now) 2. get feedback 3. if supported, set DMA buffering based on negotiation between driver and app (capabilities vs. latency needs)
Pierre-Louis Bossart (4): ALSA: core: let low-level driver or userspace disable rewinds ALSA: core: add .notify callback for pcm ops ALSA: core: add report of max dma burst ALSA: hda: add default value for max_dma_burst
include/sound/pcm.h | 5 +++++ include/uapi/sound/asound.h | 6 ++++-- sound/core/pcm_lib.c | 19 +++++++++++++++++++ sound/core/pcm_native.c | 33 ++++++++++++++++++++++++++++++++- sound/pci/hda/hda_controller.c | 1 + 5 files changed, 61 insertions(+), 3 deletions(-)