Re: [PATCH 0/2] firmware: stratix10-svc: Fix probe failure with old ATF

[MOHAMAD JAMIAN, MUHAMMAD AMIRUL ASYRAF]

On 5/5/2026 8:14 pm, Dinh Nguyen wrote:
> 
> 
> On 4/16/26 02:22, Muhammad Amirul Asyraf Mohamad Jamian wrote:
>> Since commit bcb9f4f07061 ("firmware: stratix10-svc: Add support for
>> async communication"), the SVC driver fails to probe entirely when
>> running with ATF versions older than 3.0 (e.g. ATF 2.5) that do not
>> support SIP SVC v3 asynchronous operations.
>>
>> stratix10_svc_async_init() returns -EINVAL for old ATF, and the probe
>> function treats any non-zero return as fatal, causing:
>>
>>    stratix10-svc firmware:svc: probe with driver stratix10-svc failed \
>>      with error -22
>>
>> This prevents all dependent client drivers (hwmon, RSU, FCS) from
>> probing even though they can operate correctly via the synchronous V1
>> SMC path.
>>
>> This series fixes the issue in two steps:
>>    1. Return -EOPNOTSUPP (instead of -EINVAL) when ATF async is
>>       unsupported, so callers can distinguish "not supported" from
>>       "bad argument / programming error".
>>    2. Treat -EOPNOTSUPP as non-fatal in probe, allowing the SVC driver
>>       to load in sync-only mode so all client drivers can probe normally.
>>
>> Both patches fix bcb9f4f07061 and are tagged for stable.
>>
>>
> I think it makes more sense to squash these 2 patches together. Patch 1 
> adds the -EOPNOTSUPP, but does not make use of it. Patch 2 actually 
> makes use of the -EOPNOTSUPP. So I was a bit confused on how the change 
> is getting used.
> 
> Dinh
Addressed in v2

https://lore.kernel.org/all/20260508092936.18380-1-muhammad.amirul.asyraf.mohamad.jamian@xxxxxxxxxx/

Thanks,
Amirul