Oh cool! I'm glad they included a half/quarter rate clock change bit. Just make sure you test it with adjacent channel interference; it may underclock the MAC/PHY but that doesn't necessarily mean that the analog filter is being changed. Adrian On 5 June 2013 14:35, Christian Lamparter <chunkeey@xxxxxxxxxxxxxx> wrote: > Hello Adrian > > On Wednesday, June 05, 2013 08:08:14 PM Adrian Chadd wrote: >> I think that the zydas mac doesn't officially support 5/10mhz operation. > Just checked, it looks like the bandwidth control is very similar to ath9k. > > The settings is controlled by Bit 3 and 2 in AR9170_PWR_REG_CLOCK_SEL (0x1d4008) > 00 <-- default > 01 <-- half > > There's a new firmware branch for this new feature: > <https://github.com/chunkeey/carl9170fw/tree/halfandquarter> > > The patch for the carl9170 driver will come later... Once mac/nl/cfg80211 > and userspace have support for the 5/10 MHz channel bandwidth. > > So, if you [(Mr.?) Wang] is interested, please help us testing > and integrating the stack patchset into the kernel - NOW -: > "Add support for 5 and 10 MHz channels" > <http://www.spinics.net/lists/linux-wireless/msg107116.html> > >> > I've read the "otus" vendor driver and found that in the source file >> > /HalPlus/OTUS_FB50/hpreg.h on >> > line 1915,the comment says "Temporary discard channel that BW < 20MHz >> > (5 or 10MHz) */ >> > /* Our architecture does not implemnt it" >> > I think either the driver does not implement the 5/10 channels or >> > worse,the ar9170 chip does not support 5/10 mhz channel at all. > I think "architecture" could be just the software. At least an > ath9k spectral analyzer confirmed that at least the PHY can operate > on 10 MHz channels in the 5GHz band. > >> > But 802.11j has 10mhz channel support.To comply with the 802.11j >> > standard,the chip should support 10mhz channel width. > Oh, I don't have a 802.11j copy handy, is it a mandatory or optional > feature? > >> > Also the ar9170 MAC was indeed designed by ZyDaS berfore >> > the company was taken over by Atheros. > Do you know any 5 GHz solution from ZyDaS that sold as 802.11j > compliant? > >> > It has some problems with long distance links. > True, but again look at the vendor driver. I think it should > be very easy to implement "set coverage class". The slot time > can be set by "AR9170_MAC_REG_SLOT_TIME" register and the ack > timeout should be in "AR9170_MAC_REG_ACK_EXTENSION". That's > all the information I have. So what are you waiting for ;) > > Regards, > Chr -- 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
