From: Daniel Golle <daniel@makrotopia.org>
Date: Mon, 17 Apr 2017 19:30:12 +0000 (+0200)
Subject: rt2800: fix LNA gain assignment for MT7620
X-Git-Tag: v4.12-rc1~129^2~119^2~3
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=225a644aae03ffe2ec186cd994cd5ab241130035;p=linux.git

rt2800: fix LNA gain assignment for MT7620

The base value used for MT7620 differs from Rt5392 which resulted in
quite bad RX signal quality. Fix this by using the correct base value as
well as the LNA calibration values for HT20.

Reported-by: Tom Psyborg <pozega.tomislav@gmail.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
---

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
index ba06ac2d876d..7135519a638c 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
@@ -3806,11 +3806,25 @@ static void rt2800_config_channel(struct rt2x00_dev *rt2x00dev,
 	}
 
 	if (rt2x00_rt(rt2x00dev, RT5592) || rt2x00_rt(rt2x00dev, RT6352)) {
+		reg = 0x10;
+		if (!conf_is_ht40(conf)) {
+			if (rt2x00_rt(rt2x00dev, RT6352) &&
+			    rt2x00_has_cap_external_lna_bg(rt2x00dev)) {
+				reg |= 0x5;
+			} else {
+				reg |= 0xa;
+			}
+		}
 		rt2800_bbp_write(rt2x00dev, 195, 141);
-		rt2800_bbp_write(rt2x00dev, 196, conf_is_ht40(conf) ? 0x10 : 0x1a);
+		rt2800_bbp_write(rt2x00dev, 196, reg);
 
 		/* AGC init */
-		reg = (rf->channel <= 14 ? 0x1c : 0x24) + 2 * rt2x00dev->lna_gain;
+		if (rt2x00_rt(rt2x00dev, RT6352))
+			reg = 0x04;
+		else
+			reg = rf->channel <= 14 ? 0x1c : 0x24;
+
+		reg += 2 * rt2x00dev->lna_gain;
 		rt2800_bbp_write_with_rx_chain(rt2x00dev, 66, reg);
 
 		rt2800_iq_calibrate(rt2x00dev, rf->channel);