[PATCH 4/4] mt76: mt7915: limit minimum twt duration

[Lorenzo Bianconi]

> The minimum twt duration supported by mt7915 is 64 according to hardware
> design. Reply station with TWT_SETUP_CMD_DICTATE if min_twt_dur smaller
> than 64.
> 
> Signed-off-by: Peter Chiu <chui-hao.chiu at mediatek.com>
> ---
>  drivers/net/wireless/mediatek/mt76/mt7915/mac.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
> index ff60a3d2d26d..e912ecacb578 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
> @@ -2633,6 +2633,7 @@ void mt7915_mac_add_twt_setup(struct ieee80211_hw *hw,
>  			      struct ieee80211_sta *sta,
>  			      struct ieee80211_twt_setup *twt)
>  {
> +#define MT7915_MIN_TWT_DUR 64

nit: can you please move MT7915_MIN_TWT_DUR in mt7915.h since we have other twt
defs there?

Regards,
Lorenzo

>  	enum ieee80211_twt_setup_cmd setup_cmd = TWT_SETUP_CMD_REJECT;
>  	struct mt7915_sta *msta = (struct mt7915_sta *)sta->drv_priv;
>  	struct ieee80211_twt_params *twt_agrt = (void *)twt->params;
> @@ -2654,6 +2655,12 @@ void mt7915_mac_add_twt_setup(struct ieee80211_hw *hw,
>  	if (hweight8(msta->twt.flowid_mask) == ARRAY_SIZE(msta->twt.flow))
>  		goto unlock;
>  
> +	if (twt_agrt->min_twt_dur < MT7915_MIN_TWT_DUR) {
> +		setup_cmd = TWT_SETUP_CMD_DICTATE;
> +		twt_agrt->min_twt_dur = MT7915_MIN_TWT_DUR;
> +		goto unlock;
> +	}
> +
>  	flowid = ffs(~msta->twt.flowid_mask) - 1;
>  	le16p_replace_bits(&twt_agrt->req_type, flowid,
>  			   IEEE80211_TWT_REQTYPE_FLOWID);
> -- 
> 2.18.0
> 
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