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USB discussions getting a bit heated

Former Member

On the other forum, discussions of USB and networking problems have been

getting a bit heated recently, with one user, Sulge, banned yesterday by abishur

for a 1-week cooling off period.  Maybe we will see him here soon.

 

http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=12097&start=177

http://www.raspberrypi.org/phpBB3/viewtopic.php?f=24&t=14151

http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=5249

 

Some of the USB issues are being blamed on Linux latency, which

doesn't sound easy to fix.

Parents

  • One possible problem is an interaction with something in the SD card code that uses a long timeout causing USB packets to be lost https://github.com/raspberrypi/linux/pull/72 but again, those fixes haven't been pulled yet, so even if that's the major fix very few people will be running it.

     

    Either way, the synopsis OTG controller seems to have a lot of problems, but also a lot of users.  There were some rumblings a while back that the mainline kernel folks were looking at writing a better driver. That'll take time though and would likely be written against whatever the then 'current' kernel is, not the already out of date 3.1.x. There's a lot of churn in mainline arm right now with devicetree and such like, so forward or back porting stuff really isn't simple..

Reply

  • One possible problem is an interaction with something in the SD card code that uses a long timeout causing USB packets to be lost https://github.com/raspberrypi/linux/pull/72 but again, those fixes haven't been pulled yet, so even if that's the major fix very few people will be running it.

     

    Either way, the synopsis OTG controller seems to have a lot of problems, but also a lot of users.  There were some rumblings a while back that the mainline kernel folks were looking at writing a better driver. That'll take time though and would likely be written against whatever the then 'current' kernel is, not the already out of date 3.1.x. There's a lot of churn in mainline arm right now with devicetree and such like, so forward or back porting stuff really isn't simple..

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