linux-kernel - Re: [PATCH V2] usb: xhci: add support for performing fake doorbell

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Date:   Mon, 21 Nov 2016 08:57:38 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Mathias Nyman <mathias.nyman@...el.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH V2] usb: xhci: add support for performing fake doorbell

Hi Mathias,

On 17 October 2016 at 22:30, Rafał Miłecki <zajec5@...il.com> wrote:
> From: Rafał Miłecki <rafal@...ecki.pl>
>
> Broadcom's Northstar XHCI controllers seem to need a special start
> procedure to work correctly. There isn't any official documentation of
> this, the problem is that controller doesn't detect any connected
> devices with default setup. Moreover connecting USB device to controller
> that doesn't run properly can cause SoC's watchdog issues.
>
> A workaround that was successfully tested on multiple devices is to
> perform a fake doorbell. This patch adds code for doing this and enables
> it on BCM4708 family.
>
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
> ---
> V2: Enable quirk for brcm,bcm4708 machines instead of adding separated binding
>     for it. Thanks Rob for your comment on this.

Do you think you can pick & push this one? V2 follows Rob's suggestion
and he has some DT knowledge for sure, so I guess it should be OK.