[Bug 272525] if_iwm: failed to send antennas before calibration with Intel AC 9560

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272525

            Bug ID: 272525
           Summary: if_iwm: failed to send antennas before calibration
                    with Intel AC 9560
           Product: Base System
           Version: 13.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: wireless@FreeBSD.org
          Reporter: laurent@nilio.ca

Created attachment 243413
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=243413&action=edit
dmesg during a problematic session

Hello,

Once in a while, when I boot my laptop, the iwm driver is presumably not
initialized correctly and I get these messages in the console:

iwm0: failed to send antennas before calibration: 35
iwm_run_init_ucode: failed 35
iwm_init_hw failed 35
iwm0: could not initiate scan

The last line repeats itself forever.

Unloading if_iwm and reloading it does not fix the problem. However, the
problem may disappear after a reboot.

According to sys/errno.h, 35 is EAGAIN. The device would be busy with something
else during the configuration of the antennas. I can't figure out what it's
doing, but it must be actively stuck in a bad mode for a module reload to keep
failing.

Another helpful hint is that line after the reload:

iwm0: Could not send NVM_ACCESS command (error=35)

It didn't do this the first time, but it does it after reloading the module,
meaning something caused the device regression the first time it was loaded.

Thank you,
Laurent

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