[PATCH] PCI: Increase D3 delay for AMD Renoir/Cezanne XHCI

From: Marcin Bachry
Date: Wed Jul 21 2021 - 22:58:58 EST

The Renoir XHCI controller apparently doesn't resume reliably with the
standard D3hot-to-D0 delay. Increase it to 20ms.

[Alex: I talked to the AMD USB hardware team and the AMD Windows team and
they are not aware of any HW errata or specific issues. The HW works fine
in Windows. I was told Windows uses a rather generous default delay of
100ms for PCI state transitions.]

Link: https://lore.kernel.org/r/20210722025858.220064-1-alexander.deucher@xxxxxxx
Signed-off-by: Marcin Bachry <hegel666@xxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
Cc: Prike Liang <prike.liang@xxxxxxx>
Cc: Shyam Sundar S K <shyam-sundar.s-k@xxxxxxx>
drivers/pci/quirks.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 6d74386eadc2..ab3de1551b50 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1900,6 +1900,7 @@ static void quirk_ryzen_xhci_d3hot(struct pci_dev *dev)
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x15e0, quirk_ryzen_xhci_d3hot);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x15e1, quirk_ryzen_xhci_d3hot);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x1639, quirk_ryzen_xhci_d3hot);

static int dmi_disable_ioapicreroute(const struct dmi_system_id *d)