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

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Message-ID: <580DDB16.5030906@linux.intel.com>
Date:   Mon, 24 Oct 2016 12:57:42 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Babu Moger <babu.moger@...cle.com>, mathias.nyman@...el.com,
        gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Subject: Re: [PATCH v2 RESEND] drivers/usb: Skip auto handoff for TI and
 RENESAS usb controllers

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.

-Mathias