From patchwork Tue Dec 29 23:03:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 11992751 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A06AEC433DB for ; Tue, 29 Dec 2020 23:04:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 66B9E21D1B for ; Tue, 29 Dec 2020 23:04:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726189AbgL2XD5 (ORCPT ); Tue, 29 Dec 2020 18:03:57 -0500 Received: from so254-31.mailgun.net ([198.61.254.31]:47124 "EHLO so254-31.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726161AbgL2XD5 (ORCPT ); Tue, 29 Dec 2020 18:03:57 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1609283016; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=EcGr7jPbsIV016J8qpPWQhkLnpm44nvrJJGdYGx4j2I=; b=PE7EFXZFyLREvmGEDt300WO0jpuhULlR5iKUsRvVbPNUtY8H9y3cuMsedlNfQ0ycJIVnPHZu Xpls8DX018jvA0/6bUFktqJNuF4Po66WFVwmhixZ0XJYhj4eTFLcfcnWJwnGCO8QVO65VtlD PLJqngkw6LEoeMoG5Atu0Zo6l9Y= X-Mailgun-Sending-Ip: 198.61.254.31 X-Mailgun-Sid: WyIxZTE2YSIsICJsaW51eC11c2JAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n02.prod.us-west-2.postgun.com with SMTP id 5febb5c86d2f42c6666911c2 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Tue, 29 Dec 2020 23:03:36 GMT Sender: wcheng=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 52566C433C6; Tue, 29 Dec 2020 23:03:36 +0000 (UTC) Received: from wcheng-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: wcheng) by smtp.codeaurora.org (Postfix) with ESMTPSA id 7A9A0C433C6; Tue, 29 Dec 2020 23:03:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 7A9A0C433C6 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=wcheng@codeaurora.org From: Wesley Cheng To: peter.chen@nxp.com, balbi@kernel.org, gregkh@linuxfoundation.org Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, Wesley Cheng Subject: [PATCH 0/3] Add vbus draw support to DWC3 Date: Tue, 29 Dec 2020 15:03:28 -0800 Message-Id: <1609283011-21997-1-git-send-email-wcheng@codeaurora.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Some devices are connected to standard downstream ports (SDP) and draw current from them. The current rates are defined in the BC1.2 specification, and highlights the different charge rates depending on the device state. The DWC3 gadget does not currently have a mechanism to notify external drivers about how much current can be drawn. The current rates are notified by the USB gadget layer, and the DWC3 gadget will propagate this potentially to external charger drivers. Also, the USB gadget needs to be fixed to only allow 100mA current draw when receiving a bus reset from the host, as the BC1.2 specification states that this is the max current draw possible when in the connected and unconfigured state. Wesley Cheng (3): usb: dwc3: gadget: Introduce a DWC3 VBUS draw callback usb: gadget: composite: Split composite reset and disconnect usb: gadget: configfs: Add a specific configFS reset callback drivers/usb/dwc3/gadget.c | 11 +++++++++++ drivers/usb/gadget/composite.c | 21 +++++++++++++++++++-- drivers/usb/gadget/configfs.c | 24 +++++++++++++++++++++++- include/linux/usb/composite.h | 2 ++ 4 files changed, 55 insertions(+), 3 deletions(-)