[PATCH] QCA9984 VHT160 support

Sebastian Gottschall s.gottschall at dd-wrt.com
Tue Oct 18 01:20:50 PDT 2016

Am 14.10.2016 um 12:14 schrieb Valo, Kalle:
> Sebastian Gottschall <s.gottschall at dd-wrt.com> writes:
>> This patch adds full VHT160 support for QCA9984 chipsets
>> Tested on Netgear R7800. 80+80 is possible, but disabled so far since
>> it seems to contain glitches like missing vht station flags (this may
>> be firmware or mac80211 related)
> So how did you disable 80+80 exactly? I can't find it and I would like
> to add a comment to the code so that it's easy to enable it later (once
> it's working).

IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ  =vht160 only
IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ = vht160 and 80+80 

+    if ((ar->vht_cap_info & IEEE80211_VHT_CAP_SHORT_GI_160) &&
+        !(ar->vht_cap_info & 
+        vht_cap.cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;

so if the firmware itself doesnt contain the correct vht flags but just 
short_gi_160 flag. i assume it supports vht160 and set the vht160 only 
newer firmwares on codeaurora contain the correct flags. so this code 
here gets avoided. unfortunatly the newer i found is also not stable and 
crashes often.
you can also enable 80+80 support with the current firmware.but all 
station ht and vht flags seem to be empty then in vht160 mode too. so it 
might be a firmware issue still with 80+80 or mac80211.
i did not debug that much. but vht160 works. i also tested it now with a 
88w6964 marvell client in vht160 which worked too

Mit freundlichen Grüssen / Regards

Sebastian Gottschall / CTO

NewMedia-NET GmbH - DD-WRT
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