Re: [pwc] Difficulties with a QuickCam 4000 Pro and USB2.0 hubs
At 09:38 AM 20/03/2006 +0100, you wrote: On Mon, Mar 20, 2006 at 11:48:33AM +1100, Raymond wrote: > plugged in a USB1.1 hub first - it all works BUT I don't get USB2.0 speeds > which is a bit of a problem in my case unfortunately ... Webcam supported by the pwc driver are only USB1. So if you plug it into a USB2.0 port you need to have an usb1 driver (uhci-hcd or ohci-hcd depending of your hardware), and you will not have the speed of the USB2.0. All devices on this port will run at usb1 speed. Ah OK ... is this a limitation of the webcam itself or is there something the driver uses which doesn't like EHCI? At any rate I think we've managed to bypass this problem, we've just purchased a QuickCam Pro 5000 and managed to get our software (Player/Stage based) working with the Linux UVC driver from http://linux-uvc.berlios.de/ ... Cheers! - Raymond ___ pwc mailing list pwc@lists.saillard.org http://lists.saillard.org/mailman/listinfo/pwc
Re: [pwc] Difficulties with a QuickCam 4000 Pro and USB2.0 hubs
On Mon, Mar 20, 2006 at 11:48:33AM +1100, Raymond wrote: > plugged in a USB1.1 hub first - it all works BUT I don't get USB2.0 speeds > which is a bit of a problem in my case unfortunately ... Webcam supported by the pwc driver are only USB1. So if you plug it into a USB2.0 port you need to have an usb1 driver (uhci-hcd or ohci-hcd depending of your hardware), and you will not have the speed of the USB2.0. All devices on this port will run at usb1 speed. Luc ___ pwc mailing list pwc@lists.saillard.org http://lists.saillard.org/mailman/listinfo/pwc
Re: [pwc] Difficulties with a QuickCam 4000 Pro and USB2.0 hubs
At 05:19 PM 19/03/2006 +0100, you wrote: Hi, Raymond wrote: Hi all! P.S. As a side note, if I run "lsusb", I notice that if the camera is picked up on bus 1, it fails and if it's picked up on bus 2 it succeeds (this is all the same physical port on the computer). I'm guessing if the first device plugged in (a hub or an "actual" device) is usb1.1 the firmware assigns it to bus 2 otherwise it becomes bus 1 ... not sure if that's a "normal" way of doing things or if it's something OQO have done ... Yes that standard way of doing things : the usb2 controller only manage high speed device. When a low/full speed is detected it route the device to a "companion" controller which support usb 1. OK ... I sorta thought it'd be the one hub and the switching from 1.1 to 2.0 was handled in hardware (like on a hub) ... I guess that makes sense too :-) I suppose on our computer you have 2 drivers for usb controller : ehci for usb2 and ohci/uhci for usb1. What happen if you unload/disable ehci driver ? Unloading the ehci driver (rmmod ehci-hcd) gives the same result as if I plugged in a USB1.1 hub first - it all works BUT I don't get USB2.0 speeds which is a bit of a problem in my case unfortunately ... For a laugh I tried disabling the ohci driver instead and everything fell in a heap ... Funnily enough, if I unload the ehci driver, plug in the USB2.0 hub then the webcam, then reload the ehci driver (modprobe ehci-hcd) then run "xawtv -c /dev/video0", I don't get any dmesg errors but I just get a black screen and in the xawtv terminal I get "v4l2: oops: select timeout" then "v4l2: read: Interrupted system call" then a backtrace ... I had a quick, completely uninformed poke around the driver, it looks like pwc-ctrl.c line 355, function set_video_mode_Kiara (which corresponds to the camera I'm using), send_video_command is returning the -32 (broken pipe) error which it's in turn getting from usb_control_msg ... does this mean the source of the problem is pretty much beyond our control? I would have thought usb_control_msg would be used by most (all?) USB drivers so you'd expect them all to work or all to not work unless somehow there was something weird about how the PWC chip responds to USB2.0 ... - Raymond P.S. I recognise Timon and Nala ... but who is Kiara?! ___ pwc mailing list pwc@lists.saillard.org http://lists.saillard.org/mailman/listinfo/pwc
Re: [pwc] Difficulties with a QuickCam 4000 Pro and USB2.0 hubs
Hi, Raymond wrote: Hi all! P.S. As a side note, if I run "lsusb", I notice that if the camera is picked up on bus 1, it fails and if it's picked up on bus 2 it succeeds (this is all the same physical port on the computer). I'm guessing if the first device plugged in (a hub or an "actual" device) is usb1.1 the firmware assigns it to bus 2 otherwise it becomes bus 1 ... not sure if that's a "normal" way of doing things or if it's something OQO have done ... Yes that standard way of doing things : the usb2 controller only manage high speed device. When a low/full speed is detected it route the device to a "companion" controller which support usb 1. I suppose on our computer you have 2 drivers for usb controller : ehci for usb2 and ohci/uhci for usb1. What happen if you unload/disable ehci driver ? Matthieu ___ pwc mailing list pwc@lists.saillard.org http://lists.saillard.org/mailman/listinfo/pwc
