This is a note to let you know that I've just added the patch titled
x86/PCI: Add quirk for AMD XHCI controller that loses MSI-X state in D3hot
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-pci-add-quirk-for-amd-xhci-controller-that-loses-msi-x-state-in-d3hot.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f195fc1e9715ba826c3b62d58038f760f66a4fe9 Mon Sep 17 00:00:00 2001
From: Basavaraj Natikar <Basavaraj.Natikar@xxxxxxx>
Date: Wed, 29 Mar 2023 22:58:59 +0530
Subject: x86/PCI: Add quirk for AMD XHCI controller that loses MSI-X state in D3hot
From: Basavaraj Natikar <Basavaraj.Natikar@xxxxxxx>
commit f195fc1e9715ba826c3b62d58038f760f66a4fe9 upstream.
The AMD [1022:15b8] USB controller loses some internal functional MSI-X
context when transitioning from D0 to D3hot. BIOS normally traps D0->D3hot
and D3hot->D0 transitions so it can save and restore that internal context,
but some firmware in the field can't do this because it fails to clear the
AMD_15B8_RCC_DEV2_EPF0_STRAP2 NO_SOFT_RESET bit.
Clear AMD_15B8_RCC_DEV2_EPF0_STRAP2 NO_SOFT_RESET bit before USB controller
initialization during boot.
Link: https://lore.kernel.org/linux-usb/Y%2Fz9GdHjPyF2rNG3@xxxxxxxxxxxx/T/#u
Link: https://lore.kernel.org/r/20230329172859.699743-1-Basavaraj.Natikar@xxxxxxx
Reported-by: Thomas Glanzmann <thomas@xxxxxxxxxxxx>
Tested-by: Thomas Glanzmann <thomas@xxxxxxxxxxxx>
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@xxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/pci/fixup.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
--- a/arch/x86/pci/fixup.c
+++ b/arch/x86/pci/fixup.c
@@ -7,6 +7,7 @@
#include <linux/dmi.h>
#include <linux/pci.h>
#include <linux/vgaarb.h>
+#include <asm/amd_nb.h>
#include <asm/hpet.h>
#include <asm/pci_x86.h>
@@ -824,3 +825,23 @@ static void rs690_fix_64bit_dma(struct p
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x7910, rs690_fix_64bit_dma);
#endif
+
+#ifdef CONFIG_AMD_NB
+
+#define AMD_15B8_RCC_DEV2_EPF0_STRAP2 0x10136008
+#define AMD_15B8_RCC_DEV2_EPF0_STRAP2_NO_SOFT_RESET_DEV2_F0_MASK 0x00000080L
+
+static void quirk_clear_strap_no_soft_reset_dev2_f0(struct pci_dev *dev)
+{
+ u32 data;
+
+ if (!amd_smn_read(0, AMD_15B8_RCC_DEV2_EPF0_STRAP2, &data)) {
+ data &= ~AMD_15B8_RCC_DEV2_EPF0_STRAP2_NO_SOFT_RESET_DEV2_F0_MASK;
+ if (amd_smn_write(0, AMD_15B8_RCC_DEV2_EPF0_STRAP2, data))
+ pci_err(dev, "Failed to write data 0x%x\n", data);
+ } else {
+ pci_err(dev, "Failed to read data\n");
+ }
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x15b8, quirk_clear_strap_no_soft_reset_dev2_f0);
+#endif
Patches currently in stable-queue which might be from Basavaraj.Natikar@xxxxxxx are
queue-5.15/x86-pci-add-quirk-for-amd-xhci-controller-that-loses-msi-x-state-in-d3hot.patch
