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

[Muhammad Amirul Asyraf Mohamad Jamian]

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.

Muhammad Amirul Asyraf Mohamad Jamian (2):
  firmware: stratix10-svc: Return -EOPNOTSUPP when ATF async unsupported
  firmware: stratix10-svc: Don't fail probe when async ops unsupported

 drivers/firmware/stratix10-svc.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

-- 
2.43.7