[alsa-devel] [PATCH 0/7] ALSA: Add rewinds disabled, delays, max_inflight_bytes

[Takashi Iwai]

On Fri, 30 Sep 2016 14:43:23 +0200,
Subhransu S. Prusty wrote:
> 
> Set of patches to fix issues with delays, hw_ptr fuzziness [1] and
> increased buffering w/ DSPs
> 
> 1. Rewinds can be disabled  when data written in ring buffer will never be
> validated. This allow for new HDaudio SPIB DMA functionality(allow fetch up to the
> application pointer, no rewind supported)
> 
> 2. Report max in-flight bytes to avoid problems with stale data (like late
> wake-ups, rewinds)
> 
> 3. add new estimate for USB startup delay.

Well, all these three are really individual and independent features.
So, please send three patch sets instead.

For example, I would apply the USB startup delay fix easily, while the
inflight bytes feature needs more discussion.  The rewind disablement
needs a bit more discussion (e.g. can it be disabled from the driver
side as well?).


thanks,

Takashi

> 
> [1]
> http://mailman.alsa-project.org/pipermail/alsa-devel/2015-June/093646.html
> 
> 
> Pierre-Louis Bossart (6):
>   ALSA: core: let low-level driver or userspace disable rewinds
>   ALSA: core: add .update_appl_ptr callback for pcm ops
>   ALSA: core: add report of max inflight bytes
>   ALSA: hda: add default value for max_inflight_bytes
>   ALSA: usb: no_period_wake and max_inflight_bytes report
>   ALSA: usb: take startup delay into account
> 
> Ramesh Babu (1):
>   ALSA: pcm: avoid mmap of control data if .update_appl_ptr is
>     implemented
> 
>  include/sound/pcm.h            |  4 +++
>  include/uapi/sound/asound.h    |  6 ++--
>  sound/core/pcm_lib.c           | 26 ++++++++++++++++++
>  sound/core/pcm_native.c        | 51 +++++++++++++++++++++++++++++++++-
>  sound/pci/hda/hda_controller.c |  1 +
>  sound/usb/card.h               |  1 +
>  sound/usb/pcm.c                | 62 +++++++++++++++++++++++++++++++++++++-----
>  7 files changed, 141 insertions(+), 10 deletions(-)
> 
> -- 
> 1.9.1
>