mac80211: rt2x00: reduce tx power to nominal level on RT6352

Current implementation of RT6352 support provides too high tx power
at least on iPA/eLNA devices. Reduce amplification of variable gain
amplifier by 6dB to match board target power of 17dBm.
Transmited signal strength with this patch is similar to that of
stock firmware or pandorabox firmware. Throughput measured with iperf
improves. Device tested: Xiaomi Miwifi Mini.

Signed-off-by: Tomislav Požega <pozega.tomislav@gmail.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 114 insertions, 0 deletions

diff --git a/package/kernel/mac80211/patches/rt2x00/987-rt2x00-reduce-tx-power-to-nominal-level-on-RT6352.patch b/package/kernel/mac80211/patches/rt2x00/987-rt2x00-reduce-tx-power-to-nominal-level-on-RT6352.patch
new file mode 100644
index 0000000000..f15fe7d817
--- /dev/null
+++ b/package/kernel/mac80211/patches/rt2x00/987-rt2x00-reduce-tx-power-to-nominal-level-on-RT6352.patch
@@ -0,0 +1,114 @@
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+        john@phrozen.org, sgruszka@redhat.com, daniel@makrotopia.org
+Subject: [PATCH 1/2] rt2x00: reduce tx power to nominal level on RT6352
+Date: Thu, 27 Dec 2018 15:05:25 +0100
+Message-Id: <1545919526-4074-1-git-send-email-pozega.tomislav@gmail.com>
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+
+Current implementation of RT6352 support provides too high tx power
+at least on iPA/eLNA devices. Reduce amplification of variable gain
+amplifier by 6dB to match board target power of 17dBm.
+Transmited signal strength with this patch is similar to that of
+stock firmware or pandorabox firmware. Throughput measured with iperf
+improves. Device tested: Xiaomi Miwifi Mini.
+
+Signed-off-by: Tomislav Požega <pozega.tomislav@gmail.com>
+---
+ drivers/net/wireless/ralink/rt2x00/rt2800lib.c |    2 +-
+ 1 files changed, 1 insertions(+), 1 deletions(-)
+
+--- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
++++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
+@@ -5814,7 +5814,7 @@ static int rt2800_init_registers(struct
+ 		rt2800_register_write(rt2x00dev, TX_SW_CFG2, 0x00000000);
+ 		rt2800_register_write(rt2x00dev, MIMO_PS_CFG, 0x00000002);
+ 		rt2800_register_write(rt2x00dev, TX_PIN_CFG, 0x00150F0F);
+-		rt2800_register_write(rt2x00dev, TX_ALC_VGA3, 0x06060606);
++		rt2800_register_write(rt2x00dev, TX_ALC_VGA3, 0x00000000);
+ 		rt2800_register_write(rt2x00dev, TX0_BB_GAIN_ATTEN, 0x0);
+ 		rt2800_register_write(rt2x00dev, TX1_BB_GAIN_ATTEN, 0x0);
+ 		rt2800_register_write(rt2x00dev, TX0_RF_GAIN_ATTEN, 0x6C6C666C);