[PATCH 0/3] ASoC: SOF: ipc4/Intel: Fix the host buffer constraint

[Peter Ujfalusi <peter.ujfalusi@linux.intel.com>]

Hi,

The size of the DSP host buffer was incorrectly defined as 2ms while
it is 4ms and the ChainDMA PCMs are using 5ms as host facing buffer.

The constraint will be set against the period time rather than the buffer
time to make sure that application will not face with xruns when the
DMA bursts to refill the host buffer.

The minimal period size will be also used by Pipewire in case of SOF
cards to set the headroom to a length which will avoid the cases when
the hw_ptr jumps over the appl_ptr because of a burst.
Iow, it will make Pipewire to keep a safe distance from the hw_ptr.

https://github.com/thesofproject/linux/issues/5284
https://gitlab.freedesktop.org/pipewire/wireplumber/-/merge_requests/740
https://gitlab.freedesktop.org/pipewire/pipewire/-/merge_requests/2548

Regards,
Peter
---
Peter Ujfalusi (3):
  ASoC: SOF: ipc4-topology: Correct the minimum host DMA buffer size
  ASoC: SOF: ipc4-topology: Account for different ChainDMA host buffer
    size
  ASoC: SOF: Intel: hda-pcm: Place the constraint on period time instead
    of buffer time

 sound/soc/sof/intel/hda-pcm.c | 29 +++++++++++++++++++++--------
 sound/soc/sof/ipc4-topology.c |  9 +++++++--
 sound/soc/sof/ipc4-topology.h |  7 +++++--
 3 files changed, 33 insertions(+), 12 deletions(-)

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2.51.0