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Multiple em28xx devices

linux-dvb rvf16 4 participants 5 messages Apr 9, 2009 Media (V4L/DVB)

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#0 lore raw

Hello.

I am trying to use two Terratec Cinergy Hybrid T USB XS FM tuners, at the same time, on the same system.
Both work great when used solely.
When used simultaneously the second one gives the following error :

v4l2: unable to open '/dev/video1': No space left on device

I am using the em28xx-new-b2e841c05e94 driver from
http://mcentral.de/hg/~mrec/em28xx-new on a Fedora 6 system. I have opened this topic in the em28xx mailing list
http://mcentral.de/pipermail/em28xx/ but it seems it is not maintained any more.

According to comments on relevant problems (the following is for spca5xx driver for cameras with same problem) :
-----------------------
When other USB devices are present on the same host controller bus as the camera, the bandwidth requirements of the spca5xx driver are not being met, with some hardware configurations.
The spca5xx driver is asking for more bandwidth than is available which results in these error messages.
-----------------------

We are, under these circumstances, advised to either insert the device in another USB socket or even install a PCI card with extra USB sockets so that the device ends up in different bus.
I tried to insert the second device in another usb socket but it always ends up at the same bus with the first one :

#lsusb
Bus 005 Device 014: ID 0ccd:0072 TerraTec Electronic GmbH Bus 005 Device 015: ID 0ccd:0072 TerraTec Electronic GmbH Bus 005 Device 001: ID 0000:0000 Bus 002 Device 006: ID 046d:c50e Logitech, Inc. MX-1000 Cordless Mouse Receiver
Bus 002 Device 001: ID 0000:0000 Bus 004 Device 001: ID 0000:0000 Bus 003 Device 001: ID 0000:0000 Bus 001 Device 001: ID 0000:0000 which happens to a lot of people from what i have seen.

As this is a laptop with 4 USB sockets :

# lspci | grep USB
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI 
#1 (rev 01)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI 
#2 (rev 01)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI 
#3 (rev 01)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI 
#4 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI 
Controller (rev 01)

i cannot install a PCI card with extra USB sockets so there goes workaround number two.

In spca5xx case a developer patched the driver so that the bandwidth was throttled in such a way that two devices used simultaneously would never exceed maximum.

Can that be done with em28xx?
If not, is there any other workaround to this problem?

Thank you.
Regards.

_______________________________________________
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For V4L/DVB development, please use instead [email protected] [email protected]
http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb

#1 lore raw

Hello rvf16,

Quoted 57 lines · On Thu, 09 Apr 2009 17:05:36 +0300 rvf16 <[email protected]> wrote:

Hello.

I am trying to use two Terratec Cinergy Hybrid T USB XS FM tuners, at the same time, on the same system.
Both work great when used solely.
When used simultaneously the second one gives the following error :

v4l2: unable to open '/dev/video1': No space left on device

I am using the em28xx-new-b2e841c05e94 driver from
http://mcentral.de/hg/~mrec/em28xx-new on a Fedora 6 system. I have opened this topic in the em28xx mailing list
http://mcentral.de/pipermail/em28xx/ but it seems it is not maintained any more.

According to comments on relevant problems (the following is for spca5xx driver for cameras with same problem) :
-----------------------
When other USB devices are present on the same host controller bus as the camera, the bandwidth requirements of the spca5xx driver are not being met, with some hardware configurations.
The spca5xx driver is asking for more bandwidth than is available which results in these error messages.
-----------------------

We are, under these circumstances, advised to either insert the device in another USB socket or even install a PCI card with extra USB sockets so that the device ends up in different bus. I tried to insert the second device in another usb socket but it always ends up at the same bus with the first one :

#lsusb
Bus 005 Device 014: ID 0ccd:0072 TerraTec Electronic GmbH Bus 005 Device 015: ID 0ccd:0072 TerraTec Electronic GmbH Bus 005 Device 001: ID 0000:0000 Bus 002 Device 006: ID 046d:c50e Logitech, Inc. MX-1000 Cordless Mouse Receiver
Bus 002 Device 001: ID 0000:0000 Bus 004 Device 001: ID 0000:0000 Bus 003 Device 001: ID 0000:0000 Bus 001 Device 001: ID 0000:0000 which happens to a lot of people from what i have seen.

As this is a laptop with 4 USB sockets :

# lspci | grep USB
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
UHCI #1 (rev 01)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
UHCI #2 (rev 01)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
UHCI #3 (rev 01)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB
UHCI #4 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2
EHCI Controller (rev 01)

i cannot install a PCI card with extra USB sockets so there goes workaround number two.

Quoted 6 lines

In spca5xx case a developer patched the driver so that the bandwidth was throttled in such a way that two devices used simultaneously would never exceed maximum.

Can that be done with em28xx?
If not, is there any other workaround to this problem?

Please use upstream repository, we do not support sources from
http://mcentral.de/hg/~mrec/em28xx-new this is a parallel project.

For additional info how to download upstream tree see:
http://www.linuxtv.org/wiki/index.php/How_to_Obtain%2C_Build_and_Install_V4L-DVB_Device_Drivers

Cheers,
Douglas

#2 lore raw

On Thu, Apr 9, 2009 at 10:14 AM, Douglas Schilling Landgraf

Quoted 8 lines

Please use upstream repository, we do not support sources from
http://mcentral.de/hg/~mrec/em28xx-new this is a parallel project.

For additional info how to download upstream tree see:
http://www.linuxtv.org/wiki/index.php/How_to_Obtain%2C_Build_and_Install_V4L-DVB_Device_Drivers

Cheers,
Douglas

Douglas,

Unless he is willing to do without dvb support, he's not going to be able to use the upstream em28xx driver with the Terratec XS. I've got a device being mailed to me, at which point I will be able to get the dvb support working.

Devin

Signature · 3 lines
Devin J. Heitmueller
http://www.devinheitmueller.com
AIM: devinheitmueller
#3 lore raw

Hello Devin,

Quoted 7 lines · On Thu, 9 Apr 2009 10:20:33 -0400 Devin Heitmueller…

On Thu, Apr 9, 2009 at 10:14 AM, Douglas Schilling Landgraf

Quoted 6 lines

Please use upstream repository, we do not support sources from
http://mcentral.de/hg/~mrec/em28xx-new this is a parallel project.

For additional info how to download upstream tree see:
http://www.linuxtv.org/wiki/index.php/How_to_Obtain%2C_Build_and_Install_V4L-DVB_Device_Drivers

Quoted 7 lines
Quoted 2 lines

Cheers,
Douglas

Douglas,

Unless he is willing to do without dvb support, he's not going to be able to use the upstream em28xx driver with the Terratec XS.

The idea behind that email is to inform that we do not support any parallel project.

Quoted 3 lines

I've got
a device being mailed to me, at which point I will be able to get the dvb support working.

Great, good news!

Cheers,
Douglas

#4 lore raw
In reply to rvf16
Quoted 7 lines · On Thu, Apr 9, 2009 at 4:05 PM, rvf16 <[email protected]> wrote:

Hello.

I am trying to use two Terratec Cinergy Hybrid T USB XS FM tuners, at the same time, on the same system.
Both work great when used solely.
When used simultaneously the second one gives the following error :

Quoted 8 lines

v4l2: unable to open '/dev/video1': No space left on device

I am using the em28xx-new-b2e841c05e94 driver from
http://mcentral.de/hg/~mrec/em28xx-new on a Fedora 6 system. I have opened this topic in the em28xx mailing list
http://mcentral.de/pipermail/em28xx/ but it seems it is not maintained any more.

hmm I'll check this there has been an update of the mailsystem on that box recently.

Quoted 39 lines

According to comments on relevant problems (the following is for spca5xx driver for cameras with same problem) :
-----------------------
When other USB devices are present on the same host controller bus as the camera, the bandwidth requirements of the spca5xx driver are not being met, with some hardware configurations.
The spca5xx driver is asking for more bandwidth than is available which results in these error messages.
-----------------------

We are, under these circumstances, advised to either insert the device in another USB socket or even install a PCI card with extra USB sockets so that the device ends up in different bus.
I tried to insert the second device in another usb socket but it always ends up at the same bus with the first one :

#lsusb
Bus 005 Device 014: ID 0ccd:0072 TerraTec Electronic GmbH Bus 005 Device 015: ID 0ccd:0072 TerraTec Electronic GmbH Bus 005 Device 001: ID 0000:0000 Bus 002 Device 006: ID 046d:c50e Logitech, Inc. MX-1000 Cordless Mouse Receiver
Bus 002 Device 001: ID 0000:0000 Bus 004 Device 001: ID 0000:0000 Bus 003 Device 001: ID 0000:0000 Bus 001 Device 001: ID 0000:0000 which happens to a lot of people from what i have seen.

As this is a laptop with 4 USB sockets :

# lspci | grep USB
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI
#1 (rev 01)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI
#2 (rev 01)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI
#3 (rev 01)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI
#4 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI
Controller (rev 01)
Quoted 3 lines

i cannot install a PCI card with extra USB sockets so there goes workaround number two.

you can simply try to load the em28xx with alt=3

modprobe em28xx alt=3

as long as the bus is not fully utilized this should work fine! remember you only have 480 mbit; analog TV at least requires up to 170 mbit for 1 device.

cheers,
Markus

Quoted 18 lines

In spca5xx case a developer patched the driver so that the bandwidth was throttled in such a way that two devices used simultaneously would never exceed maximum.

Can that be done with em28xx?
If not, is there any other workaround to this problem?

Thank you.
Regards.

_______________________________________________
linux-dvb users mailing list
For V4L/DVB development, please use instead [email protected] [email protected]
http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb