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mac80211: rt2x00: fix MT7620 low RSSI issue 

Introducing SoC specific RSSI base value to fix the low RSSI issue
on MT7620. With this fix[1], the RSSI value reported by MT7620 will
increase by 10 dB.

[1] https://lore.kernel.org/linux-wireless/TYAP286MB031571CDB146C414A908A66DBCFEA@TYAP286MB0315.JPNP286.PROD.OUTLOOK.COM/

Fixes: https://github.com/openwrt/openwrt/issues/11036
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
This commit is contained in:
Shiji Yang 2023-09-23 09:25:15 +08:00 committed by Daniel Golle
parent 3a5ad6e3d7
commit d152188906
1 changed files with 39 additions and 0 deletions
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39
package/kernel/mac80211/patches/rt2x00/999-wifi-rt2x00-fix-MT7620-low-RSSI-issue.patch Normal file
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@ -0,0 +1,39 @@
From: Shiji Yang <yangshiji66@outlook.com>
Date: Sat, 23 Sep 2023 07:51:39 +0800
Subject: [PATCH] wifi: rt2x00: fix MT7620 low RSSI issue
On Mediatek vendor driver[1], MT7620 (RT6352) uses different RSSI
base value '-2' compared to the other RT2x00 chips. This patch
introduces the SoC specific base value to fix the low RSSI value
reports on MT7620.
[1] Found on MT76x2E_MT7620_LinuxAP_V3.0.4.0_P3 ConvertToRssi().
Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
---
drivers/net/wireless/ralink/rt2x00/rt2800lib.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
@@ -875,6 +875,7 @@ static int rt2800_agc_to_rssi(struct rt2
s8 rssi0 = rt2x00_get_field32(rxwi_w2, RXWI_W2_RSSI0);
s8 rssi1 = rt2x00_get_field32(rxwi_w2, RXWI_W2_RSSI1);
s8 rssi2 = rt2x00_get_field32(rxwi_w2, RXWI_W2_RSSI2);
+ s8 base_val = rt2x00_rt(rt2x00dev, RT6352) ? -2 : -12;
u16 eeprom;
u8 offset0;
u8 offset1;
@@ -899,9 +900,9 @@ static int rt2800_agc_to_rssi(struct rt2
* If the value in the descriptor is 0, it is considered invalid
* and the default (extremely low) rssi value is assumed
*/
- rssi0 = (rssi0) ? (-12 - offset0 - rt2x00dev->lna_gain - rssi0) : -128;
- rssi1 = (rssi1) ? (-12 - offset1 - rt2x00dev->lna_gain - rssi1) : -128;
- rssi2 = (rssi2) ? (-12 - offset2 - rt2x00dev->lna_gain - rssi2) : -128;
+ rssi0 = (rssi0) ? (base_val - offset0 - rt2x00dev->lna_gain - rssi0) : -128;
+ rssi1 = (rssi1) ? (base_val - offset1 - rt2x00dev->lna_gain - rssi1) : -128;
+ rssi2 = (rssi2) ? (base_val - offset2 - rt2x00dev->lna_gain - rssi2) : -128;
/*
* mac80211 only accepts a single RSSI value. Calculating the