[RFC PATCH v2 0/3] i3c: dw: Add Altera SoCFPGA runtime PM disable quirk

[Krzysztof Kozlowski]

On 31/10/2025 09:27, adrianhoyin.ng at altera.com wrote:
> From: Adrian Ng Ho Yin <adrianhoyin.ng at altera.com>
> 
> This patchset adds support for an Altera SoCFPGA-specific quirk
> in the Synopsys DesignWare I3C master driver.
> 
> While running the I3C compliance test suite on the Altera Agilex5 SoCFPGA,
> the I3C bus was observed to hang when a slave device issued an IBI after
> the Dynamic Address Assignment (DAA) process completed.
> 
> This issue occurs because the controller enters a suspended state after
> DAA due to runtime PM being enabled. When suspended, the controller stops
> driving the SCL line. As a result, an IBI transfer cannot complete, leaving
> the SDA line stuck low and the bus in a hung state.
> 
> To address this issue, a new compatible string,
> "altr,socfpga-dw-i3c-master", is introduced to identify the
> SoCFPGA variant. When this compatible string is matched, a new
> quirk (DW_I3C_DISABLE_RUNTIME_PM_QUIRK) disables all runtime PM
> operations in the driver, ensuring the controller remains active
> to handle IBI transactions reliably.
> 
> ---
> changelog:
> v1->v2:
> *Add new compatible string in dw i3c dt binding.
> *Added new compatible string for altr socfpga platform.
> *Remove Kconfig that disables runtime PM added in v1.
> *Update implementation to disable runtime PM via compatible string
> match


Why is this still RFC? Please always provide reason in changelog and be
aware that some maintainers - including me - skip or just look briefly
through RFC patches since they are simply not ready.

Also remember that versioning *continuous* when dropping non-RFC.


Best regards,
Krzysztof