linux-kernel - [PATCH 5.4 55/61] PCI: Increase D3 delay for AMD Renoir/Cezanne XHCI

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Message-Id: <20210824170106.710221-56-sashal@kernel.org>
Date:   Tue, 24 Aug 2021 13:01:00 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Marcin Bachry <hegel666@...il.com>,
        Alex Deucher <alexander.deucher@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mario Limonciello <mario.limonciello@....com>,
        Prike Liang <prike.liang@....com>,
        Shyam Sundar S K <shyam-sundar.s-k@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 55/61] PCI: Increase D3 delay for AMD Renoir/Cezanne XHCI

From: Marcin Bachry <hegel666@...il.com>

[ Upstream commit e0bff43220925b7e527f9d3bc9f5c624177c959e ]

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@amd.com
Signed-off-by: Marcin Bachry <hegel666@...il.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: stable@...r.kernel.org
Cc: Mario Limonciello <mario.limonciello@....com>
Cc: Prike Liang <prike.liang@....com>
Cc: Shyam Sundar S K <shyam-sundar.s-k@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/quirks.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 6c1b936a94fa..0241f0dcc093 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1905,6 +1905,7 @@ 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);
 
 #ifdef CONFIG_X86_IO_APIC
 static int dmi_disable_ioapicreroute(const struct dmi_system_id *d)
-- 
2.30.2