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

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Date:   Mon, 24 Oct 2016 10:54:33 +0000
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Babu Moger <babu.moger@...cle.com>,
        "mathias.nyman@...el.com" <mathias.nyman@...el.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "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

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)
> 
> Is this some known issue with these vendors controllers? Is there some documentation
> about this, errata or anything?
> 
> Adding Yoshihiro Shimoda, he might know about the Renesas controller.

Thank you for adding me on this email.
However, unfortunately I don't know the detail about Renesas PCIe xHCI controllers.
(I know the xHCI controller of R-Car SoCs for now.)

Best regards,
Yoshihiro Shimoda