[PATCH v2] ath10k: remove VHT capabilities from 2.4GHz

[Michael Ney]

Also, several vendors are advertising QCA9980 and QCA9984 based access points with 256QAM support in 2.4GHz, such as the TP-Link AD7200 and the Netgear R7800, both of which advertise 800mbps 4-stream 2.4GHz capabilities.


> On Apr 21, 2016, at 4:09 PM, Sebastian Gottschall <s.gottschall at dd-wrt.com> wrote:
> 
> Am 21.04.2016 um 17:15 schrieb Ben Greear:
>> On 04/21/2016 06:17 AM, Kalle Valo wrote:
>>> From: Johannes Berg <johannes.berg at intel.com>
>>> 
>>> According to the spec, VHT doesn't exist in 2.4GHz.
>>> 
>>> There are vendor extensions to allow a subset of VHT to work
>>> (notably 256-QAM), but since mac80211 doesn't support those
>>> advertising VHT capability on 2.4GHz leads to the behaviour
>>> of reporting VHT capabilities but not being able to use any
>>> of them due to mac80211's code requiring 80 MHz support.
>>> 
>>> Remove the VHT capabilities from 2.4GHz for now. If mac80211
>>> gets extended to use the (likely Broadcom) vendor IEs for it
>>> and handles the lack of 80 MHz support, it can be added back.
>>> 
>>> Signed-off-by: Johannes Berg <johannes.berg at intel.com>
>>> Signed-off-by: Kalle Valo <kvalo at qca.qualcomm.com>
>> 
>> The thing is, it actually works just fine with the patch I posted
>> to fix mac80211, and at any rate, even if the mac80211 patch isn't
>> applied, the ath10k driver works just fine in HT mode.
>> 
>> Have you actually found any case where the existing behaviour causes
>> a real problem?
> i agree. other vendor chipsets to support QAM256 as well in 2.4 ghz (notably broadcom)
> this is nonstandard, but since all going the same way it wouldnt be a great idea to keep QCA out of that extensions.
>> 
>> Thanks,
>> Ben
>> 
> 
> 
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