From: Felipe Balbi <balbi@kernel.org>
To: Wesley Cheng <wcheng@codeaurora.org>,
peter.chen@nxp.com, gregkh@linuxfoundation.org
Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
Wesley Cheng <wcheng@codeaurora.org>
Subject: Re: [PATCH 2/3] usb: gadget: composite: Split composite reset and disconnect
Date: Tue, 05 Jan 2021 15:14:24 +0200 [thread overview]
Message-ID: <87k0srcyq7.fsf@kernel.org> (raw)
In-Reply-To: <1609283011-21997-3-git-send-email-wcheng@codeaurora.org>
Hi,
Wesley Cheng <wcheng@codeaurora.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
next prev parent reply other threads:[~2021-01-05 13:15 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-29 23:03 [PATCH 0/3] Add vbus draw support to DWC3 Wesley Cheng
2020-12-29 23:03 ` [PATCH 1/3] usb: dwc3: gadget: Introduce a DWC3 VBUS draw callback Wesley Cheng
2020-12-29 23:03 ` [PATCH 2/3] usb: gadget: composite: Split composite reset and disconnect Wesley Cheng
2021-01-05 13:14 ` Felipe Balbi [this message]
2021-01-08 2:19 ` Thinh Nguyen
2021-01-08 8:35 ` Jack Pham
2021-01-08 22:04 ` Thinh Nguyen
2021-01-08 9:13 ` gregkh
2021-01-08 22:13 ` Thinh Nguyen
2020-12-29 23:03 ` [PATCH 3/3] usb: gadget: configfs: Add a specific configFS reset callback Wesley Cheng
2021-01-04 15:45 ` Greg KH
2021-01-04 19:03 ` Wesley Cheng
-- strict thread matches above, loose matches on Subject: below --
2020-11-14 8:12 [PATCH 0/3] Add vbus draw support to DWC3 Wesley Cheng
2020-11-14 8:12 ` [PATCH 2/3] usb: gadget: composite: Split composite reset and disconnect Wesley Cheng
2020-11-16 13:44 ` Peter Chen
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