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From: Sebastian Gottschall <s.gottschall@dd-wrt.com>
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Date: Thu, 21 Apr 2016 22:09:23 +0200
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Subject: Re: [PATCH v2] ath10k: remove VHT capabilities from 2.4GHz
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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@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@intel.com>
>> Signed-off-by: Kalle Valo <kvalo@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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