2015-09-09 15:13 GMT+02:00 Alexander Aring <alex.aring@xxxxxxxxx>: > Hi, > > On Wed, Sep 09, 2015 at 02:26:27PM +0200, Baptiste Clenet wrote: >> Hi, >> >> I looked at the at86rf230 driver on bluetooth-next branch and I saw the >> two functions concerning the sleep state: >> >> at86rf230_sleep(struct at86rf230_local *lp) >> >> at86rf230_awake(struct at86rf230_local *lp) >> >> >> I'm wondering if the transceiver can wake up from a received frame if >> it is in SLEEP State? As far as I can see on the datasheet, it is not >> able to. Am I wrong? >> > > The transceiver can't. The transceiver need to be inside RX_AACK_ON state > (or RX_ON, but we don't use this state). > > What we currently support for powersaving is when the subsystem doesn't > use the transceiver then the transceiver goes into SLEEP state. > > This happens when: > > 1. After device probing. > 2. When _ALL_ interfaces which belongs to the transceiver (phy) are > down. -> Which is the state after probing. See 1. > 3. When interfaces are up and you going into pm-suspend mode. (The > interfaces are still up, but the transceiver will call "stop" > callback before and this is the same like 2. -> It stops rx but when > stopping rx you can also go into sleep). When "resume" occurs the > subsystem call "start" callback and do a "awake" and acivate rx again. > > Addtional note: we need to awake the transceiver to access registers, > there exists "direct or non-direct" nl802154 calls into the driver layer > to set registers. This is why we add before and after register access an > awake and sleep again. -> but this is very transceiver specifc, there > exists also transceiver which has register access while sleeping. > Thank you for the answer! It is what I thought. > > This is currently the stuff we support for powersaving, this has nothing > todo with 802.15.4 powersaving stuff like "beacon enabled mode". We > currently doesn't support this kind of stuff and I have also no idea how > it works and how we can implement this stuff for SoftMAC transceivers. > :-) > Yes there is still some improvments to do :-) > - Alex -- Baptiste -- To unsubscribe from this list: send the line "unsubscribe linux-wpan" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
