Jon Hunter 29defcb5da ASoC: tegra-alt: Fix restoration of PEQ settings ...

On Tegra194 the PEQ gain and shift settings are not maintained across
AUD powergate transitions. Simply by reading the gain/shift settings
from userspace via amixer/tinymix continuously causing the AUD powergate
to power cycle the settings can be seen to continuously change.

Commit bc4166782c07 ("tegra-alt: Enable ahubram prog. in hw_params")
partially fix the problem by re-configuring the gain/shift settings to
their default settings each time the PEQ is in-use, however, even with
this change, if the user changes the settings, they are not preserved.

On Tegra186 the PEQ gain and shift settings are not preserved after
transitioning to low power states such as SC7. There is a difference
between the PMC on Tegra186 and Tegra194, such that Tegra194 no longer
supports SRAM retention for the AUD powergate which explains why the
device behave slightly differently.

To ensure that the PEQ gain and shift settings are preserved for all
devices add save and restore helpers and invoke them from the OPE
runtime-pm handlers.

Bug 2072802
Bug 200375657

Change-Id: Ic867bcfd355a50eba8ba538a9471722b824df3c5
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1679636
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Asha Talambedu <atalambedu@nvidia.com>
Reviewed-by: Sameer Pujar <spujar@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2022-09-29 15:30:21 +05:30

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