Re: musb-hdrc: Vbus off, timeout 1100 msec message does not belong in sysfs
On Fri, Jul 10, 2015 at 09:17:39AM +0200, Sebastian Andrzej Siewior wrote: On 07/09/2015 11:46 PM, Pavel Machek wrote: On Thu 2015-07-09 23:39:22, Pavel Machek wrote: Hi! Hi, sysfs should contain one value per file. This one has at least two, with nice english sentence as a bonus. root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto# cat vbus Vbus off, timeout 1100 msec :-(. Plus, documentation for this is nowhere to be seen: pavel@amd:/data/l/linux-n900$ grep -ri musb Documentation/ABI/ pavel@amd:/data/l/linux-n900$ that is a shame indeed. It is part of the driver since TUSB support was merged via commit 550a7375f (USB: Add MUSB and TUSB support) about 7 years ago. The parameter expects the timeout values which is used to poll the port for mode changes (host/device mode) since it can not be detected on its own. Felipe knows best if it is better to document it or remove it. I can't remember that I needed it on am335x. N900's usersland relies on it, IIRC. But it could be that it was used just for testing. I'm not entirely sure. -- balbi signature.asc Description: Digital signature
Re: musb-hdrc: Vbus off, timeout 1100 msec message does not belong in sysfs
On 07/09/2015 11:46 PM, Pavel Machek wrote: On Thu 2015-07-09 23:39:22, Pavel Machek wrote: Hi! Hi, sysfs should contain one value per file. This one has at least two, with nice english sentence as a bonus. root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto# cat vbus Vbus off, timeout 1100 msec :-(. Plus, documentation for this is nowhere to be seen: pavel@amd:/data/l/linux-n900$ grep -ri musb Documentation/ABI/ pavel@amd:/data/l/linux-n900$ that is a shame indeed. It is part of the driver since TUSB support was merged via commit 550a7375f (USB: Add MUSB and TUSB support) about 7 years ago. The parameter expects the timeout values which is used to poll the port for mode changes (host/device mode) since it can not be detected on its own. Felipe knows best if it is better to document it or remove it. I can't remember that I needed it on am335x. Pavel Sebastian -- To unsubscribe from this list: send the line unsubscribe linux-omap in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: musb-hdrc: Vbus off, timeout 1100 msec message does not belong in sysfs
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@n900:/sys/devices/platform/6800.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@amd:/data/l/linux-n900$ grep -ri musb Documentation/ABI/ pavel@amd:/data/l/linux-n900$ ..which is a shame, because it is not really clear how to use this one: root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb -hdrc.0.auto# cat mode b_idle root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb -hdrc.0.auto# echo a_suspend mode -bash: echo: write error: Invalid argument root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb -hdrc.0.auto# echo a mode -bash: echo: write error: Invalid argument root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb -hdrc.0.auto# echo a_host mode -bash: echo: write error: Invalid argument root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb -hdrc.0.auto# echo b_host mode -bash: echo: write error: Invalid argument root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb -hdrc.0.auto# echo a_idle mode -bash: echo: write error: Invalid argument root@n900:/sys/devices/platform/6800.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/6800.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 Rohár pali.ro...@gmail.com signature.asc Description: This is a digitally signed message part.
Re: musb-hdrc: Vbus off, timeout 1100 msec message does not belong in sysfs
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@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto# cat vbus Vbus off, timeout 1100 msec :-(. Plus, documentation for this is nowhere to be seen: pavel@amd:/data/l/linux-n900$ grep -ri musb Documentation/ABI/ pavel@amd:/data/l/linux-n900$ ..which is a shame, because it is not really clear how to use this one: root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto# cat mode b_idle root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto# echo a_suspend mode -bash: echo: write error: Invalid argument root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto# echo a mode -bash: echo: write error: Invalid argument root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto# echo a_host mode -bash: echo: write error: Invalid argument root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto# echo b_host mode -bash: echo: write error: Invalid argument root@n900:/sys/devices/platform/6800.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto# echo a_idle mode -bash: echo: write error: Invalid argument root@n900:/sys/devices/platform/6800.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/6800.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto# Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line unsubscribe linux-omap in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
