linux-kernel - [PATCH] xhci: Fix USB ports for Dell Inspiron 5775

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Date:   Sun, 18 Mar 2018 23:11:10 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     mathias.nyman@...el.com
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        stable@...r.kernel.org
Subject: [PATCH] xhci: Fix USB ports for Dell Inspiron 5775

The Dell Inspiron 5775 is a Raven Ridge. The Enable Slot command timed
out when a USB device gets plugged:
[ 212.156326] xhci_hcd 0000:03:00.3: Error while assigning device slot ID
[ 212.156340] xhci_hcd 0000:03:00.3: Max number of devices this xHCI host supports is 64.
[ 212.156348] usb usb2-port3: couldn't allocate usb_device

AMD suggests that a delay before xHC suspends can fix the issue.

I can confirm it fixes the issue, so use the suspend delay quirk for
Raven Ridge's xHC.

Cc: stable@...r.kernel.org
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 drivers/usb/host/xhci-pci.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index d9f831b67e57..93ce34bce7b5 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -126,7 +126,10 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 	if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
 		xhci->quirks |= XHCI_AMD_PLL_FIX;
 
-	if (pdev->vendor == PCI_VENDOR_ID_AMD && pdev->device == 0x43bb)
+	if (pdev->vendor == PCI_VENDOR_ID_AMD &&
+		(pdev->device == 0x15e0 ||
+		 pdev->device == 0x15e1 ||
+		 pdev->device == 0x43bb))
 		xhci->quirks |= XHCI_SUSPEND_DELAY;
 
 	if (pdev->vendor == PCI_VENDOR_ID_AMD)
-- 
2.15.1