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Differential D55389

pci: introduce PCI_QUIRK_DISABLE_BUS_RESET
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Authored by bz on Feb 19 2026, 11:35 PM.
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imp

Details

Reviewers
jhb
Group Reviewers
PCI
Summary

Some QCA ath10k devices do not behave or behave odd after a bus reset.
Add a quirk for them to silently ignore bus resets.

MFC after: 3 days

Diff Detail

Repository
rG FreeBSD src repository
Lint
Lint Passed
Unit
No Test Coverage
Build Status
Buildable 70807
Build 67690: arc lint + arc unit

Event Timeline

bz created this revision.Feb 19 2026, 11:35 PM
Herald added a subscriber: imp. · View Herald TranscriptFeb 19 2026, 11:35 PM
bz requested review of this revision.Feb 19 2026, 11:35 PM
Harbormaster completed remote builds in B70807: Diff 172293.Feb 19 2026, 11:35 PM
jhb added inline comments.Feb 25 2026, 2:09 AM
sys/dev/pci/pci.c
244

Hmm, the quirk disables any reset (including FLR which isn't bus-wide). Assuming that FLR does indeed break these, maybe just call the quirk PCI_QUIRK_DISABLE_RESET?

bz added inline comments.Feb 26 2026, 12:46 AM
sys/dev/pci/pci.c
244

They didn't advertise flr from what I remember. See below in the code for more...

6881

So in theory I should probably just disable this BUS_RESET_PREPARE../POST block.
To my understanding the problem comes with link re-training.

Need to check if the cards survive a suspend/resume then... (I am trying to think if they could in that case ...)

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PathSize
sys/
dev/
pci/
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Diff 172293

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sys/dev/pci/pci.c

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