Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752635AbaBYHqd (ORCPT ); Tue, 25 Feb 2014 02:46:33 -0500 Received: from mail-bl2lp0212.outbound.protection.outlook.com ([207.46.163.212]:59481 "EHLO na01-bl2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752150AbaBYHq3 convert rfc822-to-8bit (ORCPT ); Tue, 25 Feb 2014 02:46:29 -0500 From: Peter Chen To: Neil Zhang CC: "balbi@ti.com" , "gregkh@linuxfoundation.org" , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH 2/6] usb: gadget: mv_udc: disable HW zlt for ep0 Thread-Topic: [PATCH 2/6] usb: gadget: mv_udc: disable HW zlt for ep0 Thread-Index: AQHPMTdfHn6q0sLFtkmQnfSG9aPWEJrFsrSA//+qwwCAABEV4IAAIBBQgAAJuqA= Date: Tue, 25 Feb 2014 07:46:08 +0000 Message-ID: References: <1393228996-14787-1-git-send-email-zhangwm@marvell.com> <1393228996-14787-3-git-send-email-zhangwm@marvell.com> <20140225011839.GD7540@shlinux1.ap.freescale.net> <175CCF5F49938B4D99B2E3EF7F558EBE54EC413563@SC-VEXCH4.marvell.com> <6ad74d797ecc473f922ffdb58c3e9c70@BN1PR03MB235.namprd03.prod.outlook.com> <175CCF5F49938B4D99B2E3EF7F558EBE54EC4135A5@SC-VEXCH4.marvell.com> In-Reply-To: <175CCF5F49938B4D99B2E3EF7F558EBE54EC4135A5@SC-VEXCH4.marvell.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [123.151.195.50] x-forefront-prvs: 01334458E5 x-forefront-antispam-report: SFV:NSPM;SFS:(10009001)(6009001)(24454002)(51704005)(199002)(189002)(76786001)(76576001)(77096001)(63696002)(74366001)(76796001)(59766001)(86362001)(77982001)(94946001)(47446002)(69226001)(74316001)(47736001)(81542001)(47976001)(93136001)(93516002)(81342001)(79102001)(53806001)(54356001)(76482001)(95416001)(46102001)(51856001)(54316002)(74706001)(50986001)(94316002)(4396001)(74876001)(83322001)(80976001)(81686001)(81816001)(33646001)(85852003)(56776001)(83072002)(85306002)(87266001)(90146001)(80022001)(66066001)(65816001)(95666003)(49866001)(92566001)(74662001)(74502001)(31966008)(2656002)(87936001)(24736002);DIR:OUT;SFP:1101;SCL:1;SRVR:BL2PR03MB418;H:BN1PR03MB235.namprd03.prod.outlook.com;CLIP:123.151.195.50;FPR:2ED0CD62.2E222409.73D8AFA3.14CFDF70.20173;MLV:sfv;PTR:InfoNoRecords;A:1;MX:1;LANG:en; Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-OriginatorOrg: freescale.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > > > > > > > > > > > On Mon, Feb 24, 2014 at 04:03:12PM +0800, Neil Zhang wrote: > > > > > Hardware zlt will try to send the zero length packet > > > > > automatically when the data transferd is multiple times of max > > > > > packet, this will cause issues on Windows. > > > > > So let's disable HW zlt by default. > > > > > > > > Would you have description that what kinds of issue on Windows if > > > > zlt is is selected? > > > > > > > > > > Enumeration will fail. > > > > > > > What causes enumeration fail, why it does not occur before? > > > A unexpected zero packet cause enumeration fail. > It's not easy that the descriptor is actually 1024 bytes, so not easy to > be found. > Chipidea bug too? Does it follow ch 8.5.3.2 Variable-length Data Stage, USB 2.0 spec? Peter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/