linux-kernel - Re: [RFC][PATCH 2/2] usb: dwc2: Add a quirk to allow speed negotiation for Hisilicon Hi6220

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Date:   Thu, 13 Oct 2016 16:51:26 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     Chen Yu <chenyu56@...wei.com>, Wei Xu <xuwei5@...ilicon.com>,
        Guodong Xu <guodong.xu@...aro.org>,
        Amit Pundir <amit.pundir@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        John Youn <johnyoun@...opsys.com>,
        Douglas Anderson <dianders@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, John Stultz <john.stultz@...aro.org>
Subject: Re: [RFC][PATCH 2/2] usb: dwc2: Add a quirk to allow speed
 negotiation for Hisilicon Hi6220

On Thu, Oct 13, 2016 at 4:29 PM, John Stultz <john.stultz@...aro.org> wrote:
> From: Chen Yu <chenyu56@...wei.com>
>
> The Hi6220's usb controller is limited in that it does not
> automatically autonegotiate the usb speed. Thus it requires a
> quirk so that we can manually negotiate the best usb speed for
> the attached device.
>
> Cc: Wei Xu <xuwei5@...ilicon.com>
> Cc: Guodong Xu <guodong.xu@...aro.org>
> Cc: Amit Pundir <amit.pundir@...aro.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: John Youn <johnyoun@...opsys.com>
> Cc: Douglas Anderson <dianders@...omium.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-usb@...r.kernel.org
> Signed-off-by: Chen Yu <chenyu56@...wei.com>
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
>  arch/arm64/boot/dts/hisilicon/hi6220.dtsi |  1 +
>  drivers/usb/dwc2/core.h                   |  7 +++
>  drivers/usb/dwc2/hcd.c                    | 75 +++++++++++++++++++++++++++++++
>  drivers/usb/dwc2/platform.c               |  3 ++
>  4 files changed, 86 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> index 17839db..2c8f435 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> +++ b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> @@ -752,6 +752,7 @@
>                         g-np-tx-fifo-size = <128>;
>                         g-tx-fifo-size = <128 128 128 128 128 128>;
>                         interrupts = <0 77 0x4>;
> +                       hi6220,change_speed_quirk;


I also realize I'm missing the DT binding documentation for this, but
I wanted to get a rough idea if this approach was ok first.
On the next submission (if there aren't major objections to the
approach) I can split the binding documentation and dts change into
different patches.

thanks
-john