From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: usb: musb: Force-disable pullup on shutdown From: Bin Liu Message-Id: <20190403185423.GS25852@uda0271908> Date: Wed, 3 Apr 2019 13:54:23 -0500 To: Paul Cercueil Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, od@zcrc.me List-ID: T24gV2VkLCBBcHIgMDMsIDIwMTkgYXQgMDU6NTI6MjBQTSArMDIwMCwgUGF1bCBDZXJjdWVpbCB3 cm90ZToKPiAKPiAKPiBMZSBtZXIuIDMgYXZyaWwgMjAxOSDDoCAxNzo0NiwgQmluIExpdSA8Yi1s aXVAdGkuY29tPiBhIMOpY3JpdCA6Cj4gPk9uIFdlZCwgQXByIDAzLCAyMDE5IGF0IDA1OjMxOjMx UE0gKzAyMDAsIFBhdWwgQ2VyY3VlaWwgd3JvdGU6Cj4gPj4KPiA+Pgo+ID4+IExlIG1lci4gMyBh dnJpbCAyMDE5IMOgIDE1OjI2LCBCaW4gTGl1IDxiLWxpdUB0aS5jb20+IGEgw6ljcml0IDoKPiA+ PiA+T24gVHVlLCBBcHIgMDIsIDIwMTkgYXQgMDk6NTg6NDJQTSArMDIwMCwgUGF1bCBDZXJjdWVp bCB3cm90ZToKPiA+PiA+PiBIaSwKPiA+PiA+Pgo+ID4+ID4+IExlIGx1bi4gMSBhdnJpbCAyMDE5 IMOgIDIwOjIwLCBCaW4gTGl1IDxiLWxpdUB0aS5jb20+IGEgw6ljcml0IDoKPiA+PiA+PiA+T24g 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DLEE109.ent.ti.com (157.170.170.41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Wed, 3 Apr 2019 13:54:23 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id x33IsNV6060964; Wed, 3 Apr 2019 13:54:23 -0500 Date: Wed, 3 Apr 2019 13:54:23 -0500 From: Bin Liu To: Paul Cercueil CC: , , Subject: Re: [PATCH] usb: musb: Force-disable pullup on shutdown Message-ID: <20190403185423.GS25852@uda0271908> Mail-Followup-To: Bin Liu , Paul Cercueil , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, od@zcrc.me References: <20190321144246.3547-1-paul@crapouillou.net> <20190401171725.GK25852@uda0271908> <1554140782.10471.0@crapouillou.net> <20190401182008.GL25852@uda0271908> <1554235122.13181.0@crapouillou.net> <20190403132600.GQ25852@uda0271908> <1554305491.1177.0@crapouillou.net> <20190403154654.GR25852@uda0271908> <1554306740.1177.1@crapouillou.net> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1554306740.1177.1@crapouillou.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 03, 2019 at 05:52:20PM +0200, Paul Cercueil wrote: > > > Le mer. 3 avril 2019 à 17:46, Bin Liu a écrit : > >On Wed, Apr 03, 2019 at 05:31:31PM +0200, Paul Cercueil wrote: > >> > >> > >> Le mer. 3 avril 2019 à 15:26, Bin Liu a écrit : > >> >On Tue, Apr 02, 2019 at 09:58:42PM +0200, Paul Cercueil wrote: > >> >> Hi, > >> >> > >> >> Le lun. 1 avril 2019 à 20:20, Bin Liu a écrit : > >> >> >On Mon, Apr 01, 2019 at 07:46:22PM +0200, Paul Cercueil wrote: > >> >> >> > >> >> >> > >> >> >> Le lun. 1 avril 2019 à 19:17, Bin Liu a > >>écrit : > >> >> >> >On Thu, Mar 21, 2019 at 03:42:46PM +0100, Paul Cercueil > >>wrote: > >> >> >> >> When the musb is shutdown, for instance when the driver is > >> >> >>unloaded, > >> >> >> >> force-disable the pullup. Otherwise, the host will > >>still see > >> >> >> >>the gadget > >> >> >> >> device even after the shutdown. > >> >> >> > > >> >> >> >how would this happen? > >> >> >> > > >> >> >> >when musb-hdrc driver is unloaded, udc core removes the bound > >> >> >>gadget > >> >> >> >driver which calls musb_gadget_pullup() to disable the > >>pullup. > >> >> >> > >> >> >> I'm testing with the jz4740-musb driver. I don't unload the > >> >> >>module (it's > >> >> >> built-in) but unbind it from sysfs. > >> >> > > >> >> >I did unbind too. > >> >> > > >> >> >root@am335x-evm:/sys/bus/platform/drivers/musb-hdrc# echo > >> >> >musb-hdrc.0 > unbind > >> >> > > >> >> >or unbind the glue driver: > >> >> > > >> >> >root@am335x-evm:/sys/bus/platform/drivers/musb-dsps# echo > >> >> >47401400.usb > unbind > >> >> > > >> >> >musb_gadget_pullup() is called in both cases. > >> >> > > >> >> >[ 3880.597014] [] (musb_gadget_pullup > >>[musb_hdrc]) from > >> >> >[] (usb_gadget_disconnect+0x3c/0xf4 [udc_core]) > >> >> >[ 3880.607959] [] (usb_gadget_disconnect [udc_core]) > >> >> >from [] (usb_gadget_remove_driver+0x4c/0x90 > >>[udc_core]) > >> >> >[ 3880.619338] [] (usb_gadget_remove_driver > >>[udc_core]) > >> >> >from [] (usb_del_gadget_udc+0x5c/0xc0 [udc_core]) > >> >> > >> >> In my case this stops here, usb_del_gadget_udc() does not call > >> >> usb_gadget_remove_driver(), that's why the pullup is never > >>disabled. > >> >> > >> >> I guess that's because udc->driver is NULL; I'm testing with > >> > > >> >then the pullup should be disable by now. > >> > > >> >> CONFIG_USB_CONFIGFS, > >> >> and I don't configure anything in sysfs before unbinding the > >>driver. > >> > > >> >I didn't check on this, but I could imagine that > >> >- when a configfs gadget is bound to the udc, .pullup() is called; > >> >- when the configfs gadget is unbound from the udc, .pullup > >>should be > >> > called again to disable the pullup. > >> > >> An important thing that I did not mention, is that the SoC boots > >> from USB, > >> so the pullup is active before the musb driver loads. Since in > >>my case a > > > >It sounds to me that the musb driver should disable the pullup during > >init. Isn't it? > > Yes. I can move it to musb_gadget_setup(). Should I still protect it > with > the spinlock then? Thanks. I don't think spinlock is necessary here. -Bin.