diff options
| author | Daniel Drake <[email protected]> | 2024-02-28 08:53:15 +0100 |
|---|---|---|
| committer | Bjorn Helgaas <[email protected]> | 2024-02-29 13:25:24 -0600 |
| commit | cdea98bf1faef23166262825ce44648be6ebff42 (patch) | |
| tree | 3c371651bf992075192cfece01e1a75f20ba29f7 /tools/testing/selftests/bpf/progs/recvmsg_unix_prog.c | |
| parent | 6613476e225e090cc9aad49be7fa504e290dd33d (diff) | |
PCI: Disable D3cold on Asus B1400 PCI-NVMe bridge
The Asus B1400 with original shipped firmware versions and VMD disabled
cannot resume from suspend: the NVMe device becomes unresponsive and
inaccessible.
This appears to be an untested D3cold transition by the vendor; Intel
socwatch shows that Windows leaves the NVMe device and parent bridge in D0
during suspend, even though these firmware versions have StorageD3Enable=1.
The NVMe device and parent PCI bridge both share the same "PXP" ACPI power
resource, which gets turned off as both devices are put into D3cold during
suspend. The _OFF() method calls DL23() which sets a L23E bit at offset
0xe2 into the PCI configuration space for this root port. This is the
specific write that the _ON() routine is unable to recover from. This
register is not documented in the public chipset datasheet.
Disallow D3cold on the PCI bridge to enable successful suspend/resume.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215742
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Daniel Drake <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Jian-Hong Pan <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
Diffstat (limited to 'tools/testing/selftests/bpf/progs/recvmsg_unix_prog.c')
0 files changed, 0 insertions, 0 deletions