From patchwork Thu Sep 3 02:06:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thinh Nguyen X-Patchwork-Id: 11752181 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DF498109B for ; Thu, 3 Sep 2020 02:06:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BC226207D3 for ; Thu, 3 Sep 2020 02:06:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=synopsys.com header.i=@synopsys.com header.b="i0tFf0Bx" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727965AbgICCGc (ORCPT ); Wed, 2 Sep 2020 22:06:32 -0400 Received: from smtprelay-out1.synopsys.com ([149.117.87.133]:51396 "EHLO smtprelay-out1.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726177AbgICCGc (ORCPT ); Wed, 2 Sep 2020 22:06:32 -0400 Received: from mailhost.synopsys.com (sv2-mailhost2.synopsys.com [10.205.2.134]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by smtprelay-out1.synopsys.com (Postfix) with ESMTPS id 73ED5C00B2; Thu, 3 Sep 2020 02:06:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1599098791; bh=FAcdJ8pWFyDHfDki1U6x0jqoQZefGIeFFvsdKvw53pU=; h=Date:In-Reply-To:References:From:Subject:To:Cc:From; b=i0tFf0Bxtg6RsVE3HWDcSp9XoBuZqytW8Aoy7xuyqP13nyZkTXwtutw0EXzTw7EVs 3LTGdK0nYl0q+Gg7lhMU3JwzLYF/35VXp7eIVjY4plWQ7UkGQ4ecTMqUyaatHR8Vi8 He9n+5G4NVCknEk/nepWc18doGpOtS+IoM5lnmwKfB4tB0Zqc0e5r1W4KKO4C4rrUv fzx6ANWrYpYyFiFX8tykEqFIgKpU44UVU58TezAa+IzvFLh12RCvklX0pFKageRx2w IGJqmPFsOf4N+IfncD/mFeC1RKx18LdgaqWgKGPvQs4MpuQN24/MZ6dkZ/3FDq+sOq dsPOh9VemZG6Q== Received: from te-lab16 (nanobot.internal.synopsys.com [10.10.186.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mailhost.synopsys.com (Postfix) with ESMTPSA id 4600DA007B; Thu, 3 Sep 2020 02:06:30 +0000 (UTC) Received: by te-lab16 (sSMTP sendmail emulation); Wed, 02 Sep 2020 19:06:30 -0700 Date: Wed, 02 Sep 2020 19:06:30 -0700 Message-Id: In-Reply-To: References: X-SNPS-Relay: synopsys.com From: Thinh Nguyen Subject: [PATCH v3 4/4] usb: dwc3: ep0: Skip ZLP setup for OUT To: Felipe Balbi , Greg Kroah-Hartman , Thinh Nguyen , linux-usb@vger.kernel.org Cc: John Youn Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The current implementation for ZLP handling of usb_request->zero for ep0 is only for control IN requests. For OUT direction, DWC3 needs to check and set up for MPS boundary alignment, and it doesn't do that at the moment. Usually, control OUT requests can indicate its transfer size via the wLength field of the control message. So usb_request->zero is usually not needed for OUT direction. To handle ZLP OUT for control endpoint, we'd need to allocate at least 3 TRBs for control requests (we have 2 at the moment). For now, let's just make sure the current ZLP setup is only for IN direction. Signed-off-by: Thinh Nguyen --- Changes in v3: - None Changes in v2: - None drivers/usb/dwc3/ep0.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c index 5bb4327ae237..b531f63d19de 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -979,7 +979,7 @@ static void __dwc3_ep0_do_control_data(struct dwc3 *dwc, false); ret = dwc3_ep0_start_trans(dep); } else if (IS_ALIGNED(req->request.length, dep->endpoint.maxpacket) && - req->request.length && req->request.zero) { + req->request.length && req->request.zero && req->direction) { ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request, dep->number);