diff options
| author | Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> | 2026-01-16 16:15:12 +0300 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2026-03-04 15:20:27 +0300 |
| commit | fb108754550f82a6d276e34f48be8e8b651cd877 (patch) | |
| tree | 5a3d0b792aa67ff5a02affbc1ce1342d72b5b4e0 /include/linux | |
| parent | b8bd9fe67041cfa58d5cfd7884caa178d094612d (diff) | |
| download | linux-fb108754550f82a6d276e34f48be8e8b651cd877.tar.xz | |
PCI/bwctrl: Disable BW controller on Intel P45 using a quirk
[ Upstream commit 46a9f70e93ef73860d1dbbec75ef840031f8f30a ]
The commit 665745f27487 ("PCI/bwctrl: Re-add BW notification portdrv as
PCIe BW controller") was found to lead to a boot hang on a Intel P45
system. Testing without setting Link Bandwidth Management Interrupt Enable
(LBMIE) and Link Autonomous Bandwidth Interrupt Enable (LABIE) (PCIe r7.0,
sec 7.5.3.7) in bwctrl allowed system to come up.
P45 is a very old chipset and supports only up to gen2 PCIe, so not having
bwctrl does not seem a huge deficiency.
Add no_bw_notif in struct pci_dev and quirk Intel P45 Root Port with it.
Reported-by: Adam Stylinski <kungfujesus06@gmail.com>
Link: https://lore.kernel.org/linux-pci/aUCt1tHhm_-XIVvi@eggsbenedict/
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Adam Stylinski <kungfujesus06@gmail.com>
Link: https://patch.msgid.link/20260116131513.2359-1-ilpo.jarvinen@linux.intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/pci.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index bf97d49c23cf..05aeee8c8844 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -406,6 +406,7 @@ struct pci_dev { user sysfs */ unsigned int clear_retrain_link:1; /* Need to clear Retrain Link bit manually */ + unsigned int no_bw_notif:1; /* BW notifications may cause issues */ unsigned int d3hot_delay; /* D3hot->D0 transition time in ms */ unsigned int d3cold_delay; /* D3cold->D0 transition time in ms */ |