From patchwork Tue Sep 1 15:11:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 310276 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=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 95FF4C433E2 for ; Tue, 1 Sep 2020 16:51:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 63F772078B for ; Tue, 1 Sep 2020 16:51:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598979072; bh=OI0NzzzDJKC+6IsFfD5Kf/D25Uho3/6XEAE5a6N26ys=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=0mYIQNFjDK+SCRgIEwXHhR78lA9fChBlnRiwOr84YTIsNbjITU3mD8KUvAe0Mc2fV ekxsp8J9bglsTR8ATwvWHGbCh9cGEJtzhDMYD5GqYht1ineHqUZrg4DSI/dF3cHsG8 FCRGPL6N0/cZ5lPGiKf7PusxG+b/w4GqUC2kdCrA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730245AbgIAQun (ORCPT ); Tue, 1 Sep 2020 12:50:43 -0400 Received: from mail.kernel.org ([198.145.29.99]:51486 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730097AbgIAP0S (ORCPT ); Tue, 1 Sep 2020 11:26:18 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BE5A1207D3; Tue, 1 Sep 2020 15:26:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598973978; bh=OI0NzzzDJKC+6IsFfD5Kf/D25Uho3/6XEAE5a6N26ys=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=opFgJOpWZT4a9xpGqQVZkrAa/S9DyPKsthql2NzwN1H1ZvwMojsS2vxW29ZZ1kDVT gFLvF3hBZHLlTD7jArPxenhMI9o9XMR277/SF5M6kraeqUCEmZvYa60+jYVd6Y3mDr IktGLj+sbl19IYD87w2ab1NpP4oeQXyn5sy4eKg0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Thinh Nguyen , Felipe Balbi , Sasha Levin Subject: [PATCH 4.19 122/125] usb: dwc3: gadget: Handle ZLP for sg requests Date: Tue, 1 Sep 2020 17:11:17 +0200 Message-Id: <20200901150940.589544202@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200901150934.576210879@linuxfoundation.org> References: <20200901150934.576210879@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Thinh Nguyen [ Upstream commit bc9a2e226ea95e1699f7590845554de095308b75 ] Currently dwc3 doesn't handle usb_request->zero for SG requests. This change checks and prepares extra TRBs for the ZLP for SG requests. Cc: # v4.5+ Fixes: 04c03d10e507 ("usb: dwc3: gadget: handle request->zero") Signed-off-by: Thinh Nguyen Signed-off-by: Felipe Balbi Signed-off-by: Sasha Levin --- drivers/usb/dwc3/gadget.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 9f6b430773000..7bf2573dd459e 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1104,6 +1104,35 @@ static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep, req->request.stream_id, req->request.short_not_ok, req->request.no_interrupt); + } else if (req->request.zero && req->request.length && + !usb_endpoint_xfer_isoc(dep->endpoint.desc) && + !rem && !chain) { + struct dwc3 *dwc = dep->dwc; + struct dwc3_trb *trb; + + req->needs_extra_trb = true; + + /* Prepare normal TRB */ + dwc3_prepare_one_trb(dep, req, trb_length, true, i); + + /* Prepare one extra TRB to handle ZLP */ + trb = &dep->trb_pool[dep->trb_enqueue]; + req->num_trbs++; + __dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, 0, + !req->direction, 1, + req->request.stream_id, + req->request.short_not_ok, + req->request.no_interrupt); + + /* Prepare one more TRB to handle MPS alignment */ + if (!req->direction) { + trb = &dep->trb_pool[dep->trb_enqueue]; + req->num_trbs++; + __dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, maxp, + false, 1, req->request.stream_id, + req->request.short_not_ok, + req->request.no_interrupt); + } } else { dwc3_prepare_one_trb(dep, req, trb_length, chain, i); }