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PCI: Add no PM reset quirk for NVIDIA Spectrum devices

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[ Upstream commit 3ed48c80b28d8dcd584d6ddaf00c75b7673e1a05 ]

Spectrum-{1,2,3,4} devices report that a D3hot->D0 transition causes a
reset (i.e., they advertise NoSoftRst-). However, this transition does
not have any effect on the device: It continues to be operational and
network ports remain up. Advertising this support makes it seem as if a
PM reset is viable for these devices. Mark it as unavailable to skip it
when testing reset methods.

Before:

 # cat /sys/bus/pci/devices/0000\:03\:00.0/reset_method
 pm bus

After:

 # cat /sys/bus/pci/devices/0000\:03\:00.0/reset_method
 bus

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ido Schimmel 2023-11-15 13:17:16 +01:00 committed by Greg Kroah-Hartman
parent 04dcef4a78
commit c0d5a69322
1 changed files with 13 additions and 0 deletions
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13
drivers/pci/quirks.c
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@ -3691,6 +3691,19 @@ static void quirk_no_pm_reset(struct pci_dev *dev)
DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_ATI, PCI_ANY_ID,
PCI_CLASS_DISPLAY_VGA, 8, quirk_no_pm_reset);
/*
* Spectrum-{1,2,3,4} devices report that a D3hot->D0 transition causes a reset
* (i.e., they advertise NoSoftRst-). However, this transition does not have
* any effect on the device: It continues to be operational and network ports
* remain up. Advertising this support makes it seem as if a PM reset is viable
* for these devices. Mark it as unavailable to skip it when testing reset
* methods.
*/
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MELLANOX, 0xcb84, quirk_no_pm_reset);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MELLANOX, 0xcf6c, quirk_no_pm_reset);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MELLANOX, 0xcf70, quirk_no_pm_reset);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MELLANOX, 0xcf80, quirk_no_pm_reset);
/*
* Thunderbolt controllers with broken MSI hotplug signaling:
* Entire 1st generation (Light Ridge, Eagle Ridge, Light Peak) and part