[quoted lines by Alan Stern on 2010/08/16 at 12:01 -0400] >There are numerous differences in detail between the two logs. I can't >interpret them but maybe Daniel can. However it does seem premature to >guess that the problem is related to the USB data toggle values. You're right, of course. I can now give you some more information which, I believe, tells us what the problem actually is. Based on Daniel's description of the various patches, I did a test within our code. The user's device does use hardware flow control, and our code does enable it with termios. It enables it late, though, i.e. after the device probe. I moved the enabling of hardware flow control to beforee the device probe and the device starts working right away. It's important to note, however, that this has never been a problem with users who connect the very same device directly to a serial port. I think, therefore, that the problem with the ftdi_sio driver is as follows: I believe the DTR/RTS lines are both raised all the time on a regular serial port when hardware flow control isn't enabled. My guess is that the ftdi_sio driver probably sets them low when hardware flow control is disabled (or maybe just leaves them alone). I think the fix, therefore, may be that the ftdi_sio driver needs to force DTR/RTS both high when hardware flow control is disabled. -- Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God. Phone: 1-613-726-0014 | Ottawa, Ontario | 2011 May 21 is the Day of Judgement. EMail: dave@xxxxxxxxx | Canada K2A 1H7 | 2011 Oct 21 is the End of the World. http://FamilyRadio.com/ | http://Mielke.cc/bible/ -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
