linux-kernel - [PATCH 4.17 229/336] mt76x2: fix avg

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Date:   Wed,  1 Aug 2018 18:49:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Lorenzo Bianconi <lorenzo.bianconi@...hat.com>,
        Felix Fietkau <nbd@....name>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.17 229/336] mt76x2: fix avg_rssi estimation

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lorenzo Bianconi <lorenzo.bianconi@...hat.com>

[ Upstream commit c990affd5abce1f338ac52539e092dad04647fb6 ]

Add leftover filter coefficients in IIR rssi estimation

Fixes: 7bc04215a66b ("mt76: add driver code for MT76x2e")
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
Acked-by: Felix Fietkau <nbd@....name>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/mediatek/mt76/mt76x2_phy.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/mediatek/mt76/mt76x2_phy.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x2_phy.c
@@ -492,8 +492,10 @@ mt76x2_phy_update_channel_gain(struct mt
 	u8 gain_delta;
 	int low_gain;
 
-	dev->cal.avg_rssi[0] = (dev->cal.avg_rssi[0] * 15) / 16 + (rssi0 << 8);
-	dev->cal.avg_rssi[1] = (dev->cal.avg_rssi[1] * 15) / 16 + (rssi1 << 8);
+	dev->cal.avg_rssi[0] = (dev->cal.avg_rssi[0] * 15) / 16 +
+			       (rssi0 << 8) / 16;
+	dev->cal.avg_rssi[1] = (dev->cal.avg_rssi[1] * 15) / 16 +
+			       (rssi1 << 8) / 16;
 	dev->cal.avg_rssi_all = (dev->cal.avg_rssi[0] +
 				 dev->cal.avg_rssi[1]) / 512;