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

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Message-ID: <568EA599.70503@oracle.com>
Date:	Thu, 7 Jan 2016 11:51:21 -0600
From:	Babu Moger <babu.moger@...cle.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	mathias.nyman@...el.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/usb: Skip auto handoff for TI and RENESAS usb
 controllers

On 1/7/2016 11:29 AM, Greg KH wrote:
> On Thu, Jan 07, 2016 at 09:23:27AM -0800, 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>
>> ---
>>  drivers/usb/host/pci-quirks.c |    7 +++++++
>>  1 files changed, 7 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
>> index f940056..b7ee895 100644
>> --- a/drivers/usb/host/pci-quirks.c
>> +++ b/drivers/usb/host/pci-quirks.c
>> @@ -1003,6 +1003,13 @@ 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->vendor == PCI_VENDOR_ID_RENESAS) {
>> +		val  =  (val | XHCI_HC_OS_OWNED) & ~XHCI_HC_BIOS_OWNED;
> 
> odd spaces here, why this format?

 Thanks. I will fix this. checkpatch.pl did not catch it.

> 
> And are you sure that all TI and Renesas host controllers have this
> issue?  That's a very wide and broad test you are making here...

 True, that is broad. I have tested these cards. I can probably add both vendor
 and device id combination.
 # lspci  -nn |grep -i usb
 0002:03:00.0 USB controller [0c03]: Texas Instruments TUSB73x0 SuperSpeed USB 3.0 xHCI Host Controller [104c:8241] (rev 02)
 0000:05:00.0 USB controller [0c03]: Renesas Technology Corp. uPD720201 USB 3.0 Host Controller [1912:0014] (rev 03)
 
> 
> thanks,
> 
> greg k-h
>