On Tuesday 01 July 2008, Johannes Berg wrote: > Hi, > > > The specsheets say nothing about TSF timestamps anywhere else then > > the registers (which is accessed by the get_tsf() callback function). > > To be more exact, the specsheets say _nothing_ about the RXD descriptors at all, > > which means they are not helpful for that. ;) > > Heh. > > > However there are a few RXD fields which are labeled as "reserved" which could > > mean the field is present, just not documented. > > > > You could try printing the values of those words to see if they contain valid data, > > and to be more exact the TSF data (this can be done in the function rt61pci_fill_rxdone(...)) > > The undocumented/reserved words are: 6 to 15 > > > > Do you want me to come up with a patch for this? > > > > Note that these undocumented fields only are present in rt2500pci and rt61pci. > > Ok cool, I'll play with that, I should be able to make a patch myself, > thanks. Oh wait, just found a reference about those RXD words: * The following fields are for DMA block and HOST usage only. * Can't be touched by ASIC MAC block. In other words, they are for driver usage only. :S > > Neither rt2500usb or rt73usb contain them, which means that they can't report the TSF > > based on descriptor information. > > So I guess they just don't transfer those reserved fields on USB. Which means they are pretty much screwed for TSF handling since get_tsf() has been disabled for USB drivers due to the atomic requirements of that callback function.. :S Ivo -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
