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PCI: Ignore Immediate Readiness on Samsung 990 PRO and 990 EVO Plus NVMe

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The Samsung 990 PRO [144d:a80c] advertises Immediate Readiness, so
pcie_flr() doesn't wait after FLR, but the drive returns ~0 for up to 7 ms.
Since commit 10baa9b4df ("PCI: Drop unnecessary retries when restoring
BARs"), the config restore after FLR is lost, which breaks VFIO passthrough
of the drive.  Firmware 8B2QJXD7 responds right after FLR, but older
firmware such as 1B2QJXD7 doesn't, and the firmware version isn't visible
here.

[bhelgaas: The Samsung 990 EVO Plus [144d:a80d] with 2B2QKXG7 firmware
seems to have the same problem.]

Ignore Immediate Readiness on these devices, so pcie_flr() waits.

Fixes: 10baa9b4df ("PCI: Drop unnecessary retries when restoring BARs")
Link: https://bbs.archlinux.org/viewtopic.php?id=314833
Link: https://bbs.archlinux.org/viewtopic.php?pid=2312085#p2312085
Suggested-by: Lukas Wunner <lukas@wunner.de>
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Alexander Gruhlke <gruhlke@mailbox.org>
[bhelgaas: squashed in Samsung 990 EVO Plus from
https://lore.kernel.org/all/20261016102042.641801-1-gruhlke@mailbox.org]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
Link: https://patch.msgid.link/20261011190145.23621-2-gruhlke@mailbox.org
Link: https://patch.msgid.link/20261016102042.641801-1-gruhlke@mailbox.org
This commit is contained in:
Alexander Gruhlke 2026-10-11 21:01:44 +02:00 • committed by Bjorn Helgaas
commit 0f8b5d90d1
1 changed files with 12 additions and 0 deletions
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