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mac80211: rt2x00: fix MT7620 LNA gain and VCO-after-ALC

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This should fix issues with bad RX as well as AP not coming up and/or
scanning failing.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle
2017-04-17 21:38:32 +02:00
parent 56457dbcb7
commit 97d1c49cac
2 changed files with 88 additions and 0 deletions
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54
package/kernel/mac80211/patches/021-01-rt2800-fix-LNA-gain-assignment-for-MT7620.patch Normal file
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@@ -0,0 +1,54 @@
From 0109238d62a99ea779a7e28e21868118e7b8d69d Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Mon, 10 Apr 2017 14:28:14 +0200
Subject: [PATCH 1/2] rt2800: fix LNA gain assignment for MT7620
To: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Helmut Schaa <helmut.schaa@googlemail.com>,
linux-wireless@vger.kernel.org,
Kalle Valo <kvalo@codeaurora.org>
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>
---
drivers/net/wireless/ralink/rt2x00/rt2800lib.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
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);
--
2.12.2

34
package/kernel/mac80211/patches/021-02-rt2800-do-VCO-calibration-after-programming-ALC.patch Normal file
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@@ -0,0 +1,34 @@
From feb608c7986c14bab153f31f8e96f251072e6578 Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Mon, 10 Apr 2017 15:33:20 +0200
Subject: [PATCH 2/2] rt2800: do VCO calibration after programming ALC
To: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Helmut Schaa <helmut.schaa@googlemail.com>,
linux-wireless@vger.kernel.org,
Kalle Valo <kvalo@codeaurora.org>
Scanning fails if we don't do VCO calibration every time.
The vendor driver duplicates the VCO calibration function into the
channel switching logic, we can do the same with less duplication.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
drivers/net/wireless/ralink/rt2x00/rt2800lib.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
index 7135519a638c..870bf315f98b 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
@@ -3407,6 +3407,8 @@ static void rt2800_config_alc(struct rt2x00_dev *rt2x00dev,
rt2800_rfcsr_write(rt2x00dev, 42, 0x5b);
}
rt2800_register_write(rt2x00dev, MAC_SYS_CTRL, mac_sys_ctrl);
+
+ rt2800_vco_calibration(rt2x00dev);
}
static void rt2800_bbp_write_with_rx_chain(struct rt2x00_dev *rt2x00dev,
--
2.12.2