Commit 3ed48c80 authored by Ido Schimmel's avatar Ido Schimmel Committed by David S. Miller
Browse files

PCI: Add no PM reset quirk for NVIDIA Spectrum devices 



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: default avatarIdo Schimmel <idosch@nvidia.com>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: default avatarPetr Machata <petrm@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 527a07e1

drivers/pci/quirks.c

+13 −0
Original line number Diff line number Diff line
@@ -3786,6 +3786,19 @@ 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