linux-kernel - Re: [PATCH 2/3] usb: gadget: composite: Split composite reset and disconnect

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Date:   Fri, 8 Jan 2021 02:19:30 +0000
From:   Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Wesley Cheng <wcheng@...eaurora.org>,
        "peter.chen@....com" <peter.chen@....com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 2/3] usb: gadget: composite: Split composite reset and
 disconnect

Hi Wesley,

Felipe Balbi wrote:
> Hi,
>
> Wesley Cheng <wcheng@...eaurora.org> writes:
>> +void composite_reset(struct usb_gadget *gadget)
>> +{
>> +	/*
>> +	 * Section 1.4.13 Standard Downstream Port of the USB battery charging
>> +	 * specification v1.2 states that a device connected on a SDP shall only
>> +	 * draw at max 100mA while in a connected, but unconfigured state.
> The requirements are different, though. I think OTG spec has some extra
> requirements where only 8mA can be drawn max. You need to check for the
> otg flag. Moreover, USB3+ spec has units of 150mA meaning the device
> can't draw 100mA (IIRC).
>

We see issue with this patch series. For our device running at SSP, the
device couldn't recover from a port reset and remained in eSS.Inactive
state.

This patch series is already in Greg's usb-testing. Please review and
help fix it.

We can see the failure once the patch "usb: gadget: configfs: Add a
specific configFS reset callback" is introduced.

Thanks,
Thinh