From: Roger Quadros <rogerq@ti.com>
To: <balbi@kernel.org>
Cc: <Dylan.Howey@tennantco.com>, <linux-usb@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
"# v4 . 13+" <stable@vger.kernel.org>
Subject: Re: [PATCH v2] usb: dwc3: gadget: Fix .udc_set_speed()
Date: Tue, 31 Oct 2017 15:54:34 +0200 [thread overview]
Message-ID: <832a42bb-aaa3-68a3-72f9-1938e48a484a@ti.com> (raw)
In-Reply-To: <3773d6f2-113b-862e-3365-d47efa3a77ed@ti.com>
Felipe,
Forgot to update subject :P.
Will resend.
On 31/10/17 15:47, Roger Quadros wrote:
> Currently UDC core calls ->udc_set_speed() with the speed parameter
> containing the maximum speed supported by the gadget function
> driver. This might very well be more than that supported by the
> UDC controller driver.
>
> Select the lesser of the 2 speeds so both UDC and gadget function
> driver are operating within limits.
>
> This fixes PHY Erratic errors and 2 second enumeration delay on
> TI's AM437x platforms.
>
> Fixes: 6099eca796ae ("usb: gadget: core: introduce ->udc_set_speed() method")
> Cc: <stable@vger.kernel.org> # v4.13+
> Reported-by: Dylan Howey <Dylan.Howey@tennantco.com>
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> ---
> v2:
> - Move speed limiting code to UDC core.
>
> drivers/usb/gadget/udc/core.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
> index d41d07a..def1b05 100644
> --- a/drivers/usb/gadget/udc/core.c
> +++ b/drivers/usb/gadget/udc/core.c
> @@ -1080,8 +1080,12 @@ static inline void usb_gadget_udc_stop(struct usb_udc *udc)
> static inline void usb_gadget_udc_set_speed(struct usb_udc *udc,
> enum usb_device_speed speed)
> {
> - if (udc->gadget->ops->udc_set_speed)
> - udc->gadget->ops->udc_set_speed(udc->gadget, speed);
> + if (udc->gadget->ops->udc_set_speed) {
> + enum usb_device_speed s;
> +
> + s = min(speed, udc->gadget->max_speed);
> + udc->gadget->ops->udc_set_speed(udc->gadget, s);
> + }
> }
>
> /**
>
--
cheers,
-roger
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
next prev parent reply other threads:[~2017-10-31 13:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-31 13:01 [PATCH] usb: dwc3: gadget: Fix .udc_set_speed() Roger Quadros
2017-10-31 13:24 ` Felipe Balbi
2017-10-31 13:27 ` Roger Quadros
2017-10-31 13:47 ` [PATCH v2] " Roger Quadros
2017-10-31 13:54 ` Roger Quadros [this message]
2017-10-31 13:56 ` [PATCH v2][RESEND] usb: gadget: core: Fix ->udc_set_speed() speed handling Roger Quadros
2017-11-01 14:24 ` Alan Stern
2017-11-01 15:11 ` Roger Quadros
2017-11-01 15:45 ` Alan Stern
2017-11-02 8:53 ` Roger Quadros
2017-11-02 14:14 ` Alan Stern
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