Public bug reported:
[Impact]
On MediaTek MT8901 arm64 systems that enumerate the mt65xx SPI and I2C
controllers through ACPI, the drivers do not fully manage firmware-owned
clocks and power resources across runtime and system sleep.
SPI lacks the required ACPI clock setup and runtime autosuspend
integration, while the existing I2C ACPI path lacks Power Wrap lifecycle
and noirq suspend/resume handling.
[Fix]
Add ACPI support for NVDA0210 SPI controllers, skip device-tree-only
setup on ACPI systems, and integrate the MediaTek Power Wrap client into
both drivers.
Add runtime autosuspend and system-sleep handling for SPI, plus Power
Wrap lifecycle and noirq suspend/resume handling for I2C.
The required SSPM and Power Wrap support is tracked by Launchpad bug
2167298 and has been applied to the corresponding Canonical next
branches.
[Test Case]
Build the linux-nvidia and linux-nvidia-bos arm64 kernels with the SSPM
and Power Wrap prerequisite.
Verify that the ACPI-enumerated SPI and I2C controllers probe and
successfully perform transfers before and after runtime autosuspend.
Verify S3 and s2idle suspend/resume, followed by successful transfers.
[Where problems could occur]
The changes affect ACPI-specific probe, remove, error-unwind, and power
transition paths in the shared mt65xx SPI and I2C drivers. Regressions
could affect controller enumeration, transfers, or suspend/resume on
supported MediaTek ACPI systems. Device-tree paths are intended to
remain unchanged.
** Affects: linux-nvidia-bos (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2167886
Title:
[linux-nvidia]: MediaTek MT8901: add SPI/I2C ACPI power-management
support
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