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

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Date:   Tue, 05 Jan 2021 15:14:24 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Wesley Cheng <wcheng@...eaurora.org>, peter.chen@....com,
        gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Wesley Cheng <wcheng@...eaurora.org>
Subject: Re: [PATCH 2/3] usb: gadget: composite: Split composite reset and
 disconnect


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).

-- 
balbi