From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pali =?utf-8?q?Roh=C3=A1r?= Subject: Re: musb-hdrc: "Vbus off, timeout 1100 msec" message does not belong in sysfs Date: Thu, 9 Jul 2015 23:54:36 +0200 Message-ID: <201507092354.36649@pali> References: <20150709213922.GA32698@amd> <20150709214610.GA20890@amd> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart31235275.TegAg5q0Su"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20150709214610.GA20890@amd> Sender: linux-kernel-owner@vger.kernel.org To: Pavel Machek Cc: Greg KH , balbi@ti.com, bigeasy@linutronix.de, george.cherian@ti.com, tony@atomide.com, varkabhadram@gmail.com, linux-kernel@vger.kernel.org, sre@debian.org, sre@ring0.de, linux-arm-kernel , linux-omap@vger.kernel.org, khilman@kernel.org, aaro.koskinen@iki.fi, ivo.g.dimitrov.75@gmail.com, patrikbachan@gmail.com List-Id: linux-omap@vger.kernel.org --nextPart31235275.TegAg5q0Su Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Thursday 09 July 2015 23:46:10 Pavel Machek wrote: > On Thu 2015-07-09 23:39:22, Pavel Machek wrote: > > Hi! > >=20 > > sysfs should contain one value per file. This one has at least two, > > with nice english sentence as a bonus. > >=20 > > root@n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/mu > > sb-hdrc.0.auto# cat vbus > > Vbus off, timeout 1100 msec > >=20 > > :-(. >=20 > Plus, documentation for this is nowhere to be seen: >=20 > pavel@amd:/data/l/linux-n900$ grep -ri musb Documentation/ABI/ > pavel@amd:/data/l/linux-n900$ >=20 > ..which is a shame, because it is not really clear how to use this > one: >=20 > root@n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# cat mode > b_idle > root@n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# echo a_suspend > mode > -bash: echo: write error: Invalid argument > root@n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# echo a > mode > -bash: echo: write error: Invalid argument > root@n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# echo a_host > mode > -bash: echo: write error: Invalid argument > root@n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# echo b_host > mode > -bash: echo: write error: Invalid argument > root@n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# echo a_idle > mode > -bash: echo: write error: Invalid argument > root@n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# echo b_wait_acon > mode > -bash: echo: write error: Invalid argument > root@n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# >=20 >=20 > Pavel Hi! I remember that this file is used for switching between usb peripheral=20 and host mode. But because n900 HW somehow broken, for usb host mode are=20 needed couple of "hack" patches which workaround HW bugs... This is=20 still not enough and "support" from userspace is needed for it too. Kernel patches are part of Maemo kernel-power 2.6.28 version and with=20 package usbmode http://maemo.org/packages/view/usbmode/ is it possible=20 to enter usb host mode on n900 (and then connect e.g. usb stick). And IIRC correct command is: # echo host > mode # echo peripheral > mode =2D-=20 Pali Roh=C3=A1r pali.rohar@gmail.com --nextPart31235275.TegAg5q0Su Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEABECAAYFAlWe7ZwACgkQi/DJPQPkQ1K74wCeJUmg2JgXPaA2dE4TyVLIlV8n qj4AoMQm3fdkgjK5bM7TubMm/YWm553T =sWOg -----END PGP SIGNATURE----- --nextPart31235275.TegAg5q0Su-- From mboxrd@z Thu Jan 1 00:00:00 1970 From: pali.rohar@gmail.com (Pali =?utf-8?q?Roh=C3=A1r?=) Date: Thu, 9 Jul 2015 23:54:36 +0200 Subject: musb-hdrc: "Vbus off, timeout 1100 msec" message does not belong in sysfs In-Reply-To: <20150709214610.GA20890@amd> References: <20150709213922.GA32698@amd> <20150709214610.GA20890@amd> Message-ID: <201507092354.36649@pali> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thursday 09 July 2015 23:46:10 Pavel Machek wrote: > On Thu 2015-07-09 23:39:22, Pavel Machek wrote: > > Hi! > > > > sysfs should contain one value per file. This one has at least two, > > with nice english sentence as a bonus. > > > > root at n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/mu > > sb-hdrc.0.auto# cat vbus > > Vbus off, timeout 1100 msec > > > > :-(. > > Plus, documentation for this is nowhere to be seen: > > pavel at amd:/data/l/linux-n900$ grep -ri musb Documentation/ABI/ > pavel at amd:/data/l/linux-n900$ > > ..which is a shame, because it is not really clear how to use this > one: > > root at n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# cat mode > b_idle > root at n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# echo a_suspend > mode > -bash: echo: write error: Invalid argument > root at n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# echo a > mode > -bash: echo: write error: Invalid argument > root at n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# echo a_host > mode > -bash: echo: write error: Invalid argument > root at n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# echo b_host > mode > -bash: echo: write error: Invalid argument > root at n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# echo a_idle > mode > -bash: echo: write error: Invalid argument > root at n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# echo b_wait_acon > mode > -bash: echo: write error: Invalid argument > root at n900:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb > -hdrc.0.auto# > > > Pavel Hi! I remember that this file is used for switching between usb peripheral and host mode. But because n900 HW somehow broken, for usb host mode are needed couple of "hack" patches which workaround HW bugs... This is still not enough and "support" from userspace is needed for it too. Kernel patches are part of Maemo kernel-power 2.6.28 version and with package usbmode http://maemo.org/packages/view/usbmode/ is it possible to enter usb host mode on n900 (and then connect e.g. usb stick). And IIRC correct command is: # echo host > mode # echo peripheral > mode -- Pali Roh?r pali.rohar at gmail.com -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 198 bytes Desc: This is a digitally signed message part. URL: