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

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Date:   Tue, 25 Oct 2016 09:51:10 +0300
From:   Mathias Nyman <mathias.nyman@...el.com>
To:     Babu Moger <babu.moger@...cle.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Cc:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 RESEND] drivers/usb: Skip auto handoff for TI and
 RENESAS usb controllers

On 24.10.2016 17:52, Babu Moger wrote:
>
> On 10/24/2016 5:54 AM, Yoshihiro Shimoda wrote:
>> Hi,
>>
>>> From: Mathias Nyman
>>> Sent: Monday, October 24, 2016 6:58 PM
>>>
>>> On 22.10.2016 01:25, Babu Moger wrote:
>>>> Never seen XHCI 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>
>>> Do the Renesas and TI controllers still advertise the extended capability
>>> for the handoff? (XHCI_EXT_CAPS_LEGACY)
> I don't see this capability.  Here is lspci output.
>

It's not a PCI capability, it's a xhci Extended Capability.

If the capability is supported, and handoff fail, then quirk_usb_handoff_xhci() will print
"xHCI BIOS handoff failed (BIOS bug ?)"

Further on in the same function we wait for the "controller not ready" bit in the status
register to clear. If that times it prints out:

"xHCI HW not ready after 5 sec (HC bug?) status"

Do you see any of these two messages in the log?

-Mathias