linux-kernel - Re: [PATCH v2] drivers/usb: Skip auto handoff for TI and RENESAS usb controllers

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Date:	Wed, 16 Mar 2016 17:26:01 -0500
From:	Babu Moger <babu.moger@...cle.com>
To:	mathias.nyman@...el.com
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drivers/usb: Skip auto handoff for TI and RENESAS usb
 controllers

Its  been a while since I submit this patch. Ping 1. 

On 1/8/2016 9:39 AM, Babu Moger wrote:
> I have never seen auto handoff working on TI and RENESAS cards.
> Eventually, we force handoff. This code forces the handoff
> unconditionally. It saves 5 seconds boot time for each card.
> 
> Signed-off-by: Babu Moger <babu.moger@...cle.com>
> ---
> v2: 
>  Made changes per comments from Greg KH.
>  Extra space removal in assignment
>  Added both vendor and device id checks.
> 
>  drivers/usb/host/pci-quirks.c |    8 ++++++++
>  1 files changed, 8 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
> index f940056..0915f44 100644
> --- a/drivers/usb/host/pci-quirks.c
> +++ b/drivers/usb/host/pci-quirks.c
> @@ -1003,6 +1003,14 @@ static void quirk_usb_handoff_xhci(struct pci_dev *pdev)
>  		ext_cap_offset = xhci_find_next_cap_offset(base, ext_cap_offset);
>  	} while (1);
>  
> +	/* Auto handoff never worked for these devices. Force it and continue */
> +	if ((pdev->vendor == PCI_VENDOR_ID_TI && pdev->device == 0x8241) ||
> +			(pdev->vendor == PCI_VENDOR_ID_RENESAS
> +			 && pdev->device == 0x0014)) {
> +		val = (val | XHCI_HC_OS_OWNED) & ~XHCI_HC_BIOS_OWNED;
> +		writel(val, base + ext_cap_offset);
> +	}
> +
>  	/* If the BIOS owns the HC, signal that the OS wants it, and wait */
>  	if (val & XHCI_HC_BIOS_OWNED) {
>  		writel(val | XHCI_HC_OS_OWNED, base + ext_cap_offset);
>