linux-kernel - Re: [PATCH v2] mt76: mt7615: add support for per-chain signal strength reporting

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Date:   Wed, 12 Jun 2019 10:37:40 +0200
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     Ryder Lee <ryder.lee@...iatek.com>
Cc:     Felix Fietkau <nbd@....name>,
        Lorenzo Bianconi <lorenzo.bianconi@...hat.com>,
        Roy Luo <royluo@...gle.com>, YF Luo <yf.luo@...iatek.com>,
        Yiwei Chung <yiwei.chung@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        linux-wireless@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mt76: mt7615: add support for per-chain signal
 strength reporting

> Fill in RX status->chain_signal to avoid empty value.
> 
> Signed-off-by: Ryder Lee <ryder.lee@...iatek.com>
> ---
> Changes since v2 - correct calculation sequence
> ---
>  .../net/wireless/mediatek/mt76/mt7615/mac.c   | 30 ++++++++++++++++++-
>  .../net/wireless/mediatek/mt76/mt7615/mac.h   |  5 ++++
>  2 files changed, 34 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> index b60d42b5923d..2f49a99e77b1 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> @@ -13,6 +13,11 @@
>  #include "../dma.h"
>  #include "mac.h"
>  

[...]

> @@ -169,7 +175,29 @@ int mt7615_mac_fill_rx(struct mt7615_dev *dev, struct sk_buff *skb)
>  
>  		status->enc_flags |= RX_ENC_FLAG_STBC_MASK * stbc;
>  
> -		/* TODO: RSSI */
> +		status->chains = dev->mt76.antenna_mask;
> +		status->chain_signal[0] = to_rssi(MT_RXV4_RCPI0, rxdg3);
> +		status->chain_signal[1] = to_rssi(MT_RXV4_RCPI1, rxdg3);
> +		status->chain_signal[2] = to_rssi(MT_RXV4_RCPI2, rxdg3);
> +		status->chain_signal[3] = to_rssi(MT_RXV4_RCPI3, rxdg3);
> +		status->signal = status->chain_signal[0];
> +
> +		switch (status->chains) {
> +		case 0xf:
> +			status->signal = max(status->signal,
> +					     status->chain_signal[3]);
> +			/* fall through */
> +		case 0x7:
> +			status->signal = max(status->signal,
> +					     status->chain_signal[2]);
> +			/* fall through */
> +		case 0x3:
> +			status->signal = max(status->signal,
> +					     status->chain_signal[1]);
> +			break;
> +		default:
> +			break;
> +		}

is it possible to enable rx chains selectively (e.g. chain 0 and 2)?
If so we can do something like:

for (i = 1; i < hweight8(dev->mt76.antenna_mask); i++) {
	if (!(status->chains & BIT(i)))
		continue;

	status->signal = max(status->signal,
			     status->chain_signal[i]);
}

Regards,
Lorenzo

>  		rxd += 6;
>  		if ((u8 *)rxd - skb->data >= skb->len)
>  			return -EINVAL;
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.h b/drivers/net/wireless/mediatek/mt76/mt7615/mac.h
> index 18ad4b8a3807..b00ce8db58e9 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.h
> +++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.h
> @@ -98,6 +98,11 @@ enum rx_pkt_type {
>  #define MT_RXV2_GROUP_ID		GENMASK(26, 21)
>  #define MT_RXV2_LENGTH			GENMASK(20, 0)
>  
> +#define MT_RXV4_RCPI3			GENMASK(31, 24)
> +#define MT_RXV4_RCPI2			GENMASK(23, 16)
> +#define MT_RXV4_RCPI1			GENMASK(15, 8)
> +#define MT_RXV4_RCPI0			GENMASK(7, 0)
> +
>  enum tx_header_format {
>  	MT_HDR_FORMAT_802_3,
>  	MT_HDR_FORMAT_CMD,
> -- 
> 2.18.0
> 

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