ASoC: SOF: Intel: Harden the IPC4 low level sequencing

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Merge series from Peter Ujfalusi <peter.ujfalusi@linux.intel.com>:

Hi,

The IPC4 use of doorbell registers leaves some corner cases not well defined
and the 'correct sequences' are subjective in a sense.
The DSP doorbell registers are used as separate and independent channels and
the sequences for host -> DSP -> host (reply) can be racy.

For example:
The ACKing of a received message can happen before the firmware sends the reply
or it can as well happen after the reply has been sent and received by the host.
Both can be considered 'correct sequences' but they need different handling.

This series will allow the kernel to service any interpretation of the
sequencing on the firmware side.

...

This commit is contained in:

Mark Brown 2022-10-19 15:13:17 +01:00

parent 4306fc8f83 010c050fe9

commit 3109bfda27

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6 changed files with 88 additions and 13 deletions

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26

sound/soc/sof/intel/cnl.c

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27

sound/soc/sof/intel/hda-ipc.c

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sound/soc/sof/intel/hda.c

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sound/soc/sof/intel/hda.h

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sound/soc/sof/intel/mtl.c

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sound/soc/sof/ipc4.c

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