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
