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

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Date:   Tue, 10 Apr 2018 12:56:00 +0800
From:   Kai Heng Feng <kai.heng.feng@...onical.com>
To:     mathias.nyman@...el.com
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Linux USB Mailing List <linux-usb@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable@...r.kernel.org
Subject: Re: [PATCH] xhci: Fix USB ports for Dell Inspiron 5775

Hi Matthias,

> On Mar 18, 2018, at 11:11 PM, Kai-Heng Feng <kai.heng.feng@...onical.com>  
> wrote:
>
> 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.

I am hoping this patch can get merged in v4.17...

Thanks,
Kai-Heng

>
> 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