Re: [PATCH 2/2] mt76: connac: add support maximum regulatory Tx power

[Lorenzo Bianconi <lorenzo@kernel.org>]

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> From: YN Chen <YN.Chen@mediatek.com>
> 
> Consider .max_reg_power in struct ieee80211_channel to limit the
> maximum power the wireless device allowed to transmit on the
> corresponding channel according to the regulatory domain.
> 
> Co-developed-by: Sean Wang <sean.wang@mediatek.com>
> Signed-off-by: Sean Wang <sean.wang@mediatek.com>
> Signed-off-by: YN Chen <YN.Chen@mediatek.com>
> ---
>  .../wireless/mediatek/mt76/mt76_connac_mcu.c  | 43 ++++++++++++++++++-
>  1 file changed, 41 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
> index d71393b1c5e6..84f42ce12626 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
> @@ -1773,6 +1773,43 @@ static s8 mt76_connac_get_sar_power(struct mt76_phy *phy,
>  	return target_power;
>  }
>  
> +static s8 mt76_connac_get_ch_power(struct mt76_phy *phy,
> +				   struct ieee80211_channel *chan,
> +				   s8 target_power)
> +{
> +	struct mt76_dev *dev = phy->dev;

is it used?

> +	struct ieee80211_supported_band *sband;
> +	int i;
> +
> +	switch (chan->band) {
> +	case NL80211_BAND_2GHZ:
> +		sband = &phy->sband_2g.sband;
> +		break;
> +	case NL80211_BAND_5GHZ:
> +		sband = &phy->sband_5g.sband;
> +		break;
> +	default:
> +		return target_power;
> +	}
> +
> +	for (i = 0; i < sband->n_channels; i++) {
> +		struct ieee80211_channel *ch = &sband->channels[i];
> +
> +		if (ch->hw_value == chan->hw_value) {
> +			if (!(ch->flags & IEEE80211_CHAN_DISABLED)) {
> +				int power = 2 * ch->max_reg_power;
> +
> +				if (power > 127 || power < -127)
> +					power = 127;

please correct me if I am wrong, but I guess the limit for mt7663 should be 63,
isn't it?

Regards,
Lorenzo

> +				target_power = min_t(s8, power, target_power);
> +			}
> +			break;
> +		}
> +	}
> +
> +	return target_power;
> +}
> +
>  static int
>  mt76_connac_mcu_rate_txpower_band(struct mt76_phy *phy,
>  				  enum nl80211_band band)
> @@ -1840,10 +1877,12 @@ mt76_connac_mcu_rate_txpower_band(struct mt76_phy *phy,
>  				.hw_value = ch_list[idx],
>  				.band = band,
>  			};
> -			s8 sar_power;
> +			s8 reg_power, sar_power;
>  
> +			reg_power = mt76_connac_get_ch_power(phy, &chan,
> +							     tx_power);
>  			sar_power = mt76_connac_get_sar_power(phy, &chan,
> -							      tx_power);
> +							      reg_power);
>  
>  			mt76_get_rate_power_limits(phy, &chan, &limits,
>  						   sar_power);
> -- 
> 2.25.1
> 

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