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Valerio Setti <vsetti@baylibre.com> says:
This is a follow-up to the recently merged series reshaping the AIU
driver following the same design as AXG [1]. During the review,
Jerome pointed out that failing in hw_params() when two streams have
incompatible requirements is too late from userspace's point of view [2].
This series addresses that comment:
- Patch 1 fixes the existing bclk quirk check first: it only rejected
one direction of the mismatch, and its interface-wide flag was
cleared too late, making a legal reconfiguration of a single stream
fail. This is a standalone fix and it's preparing for patch 2.
- Patch 2 is the actual answer to the review comment: the quirk
incompatibility is expressed as hw rules on channels and sample
bits, refined against the committed configuration of the opposite
stream, so it becomes visible during parameter refinement. The
hw_params() check is kept as the last backstop in case of concurrent
refinement.
- Patch 3 applies the same philosophy to the interface-wide rate
symmetry. Instead of manually reimplementing the check, take advantage of
the core's 'symmetric_rate' handling.
Jerome's comment also mentioned the error returned when 'bs' is not a
multiple of 2. That one intentionally remains a hw_params() time
error: bs depends on the mclk rate, which the DAI only learns via
set_sysclk() from the machine driver's hw_params(), after parameter
refinement has already run. I don't think that can easily be expressed as
a constraint.
Final note. [1] has not been mainlined yet and it's only present in
'broonie/sound.git#for-7.3'. Therefore this series depends on commit
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Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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