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

[Ng, Adrian Ho Yin]

On 10/31/2025 4:32 PM, Krzysztof Kozlowski wrote:
> 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.
> 
Noted. Will resend and drop the RFC tag and update reason in the 
changelog.>
> Best regards,
> Krzysztof


Thank You,
Adrian