From: Ido Schimmel <idosch@nvidia.com>
Date: Wed, 15 Nov 2023 12:17:16 +0000 (+0100)
Subject: PCI: Add no PM reset quirk for NVIDIA Spectrum devices
X-Git-Tag: v6.6.17~377
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b59bc70172524d936904666885fdb95373c524ca;p=platform%2Fkernel%2Flinux-rpi.git

PCI: Add no PM reset quirk for NVIDIA Spectrum devices

[ 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>
---

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index e008191..8f3b91e 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3787,6 +3787,19 @@ 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
  * of the 2nd generation (Cactus Ridge 4C up to revision 1, Port Ridge).