package/kernel/mac80211/patches/rt2x00/002-v6.7-wifi-rt2x00-fix-MT7620-low-RSSI-issue.patch

   1 From 2ecfe6f07e8e6257cad3d3290c5aec2102120041 Mon Sep 17 00:00:00 2001
   2 From: Shiji Yang <yangshiji66@outlook.com>
   3 Date: Sat, 23 Sep 2023 09:01:01 +0800
   4 Subject: wifi: rt2x00: fix MT7620 low RSSI issue
   5
   6 On Mediatek vendor driver[1], MT7620 (RT6352) uses different RSSI
   7 base value '-2' compared to the other RT2x00 chips. This patch
   8 introduces the SoC specific base value to fix the low RSSI value
   9 reports on MT7620.
  10
  11 [1] Found on MT76x2E_MT7620_LinuxAP_V3.0.4.0_P3 ConvertToRssi().
  12
  13 Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
  14 Acked-by: Stanislaw Gruszka <stf_xl@wp.pl>
  15 Signed-off-by: Kalle Valo <kvalo@kernel.org>
  16 Link: https://lore.kernel.org/r/TYAP286MB031571CDB146C414A908A66DBCFEA@TYAP286MB0315.JPNP286.PROD.OUTLOOK.COM
  17 ---
  18  drivers/net/wireless/ralink/rt2x00/rt2800lib.c | 7 ++++---
  19  1 file changed, 4 insertions(+), 3 deletions(-)
  20
  21 --- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
  22 +++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
  23 @@ -856,6 +856,7 @@ static int rt2800_agc_to_rssi(struct rt2
  24         s8 rssi0 = rt2x00_get_field32(rxwi_w2, RXWI_W2_RSSI0);
  25         s8 rssi1 = rt2x00_get_field32(rxwi_w2, RXWI_W2_RSSI1);
  26         s8 rssi2 = rt2x00_get_field32(rxwi_w2, RXWI_W2_RSSI2);
  27 +       s8 base_val = rt2x00_rt(rt2x00dev, RT6352) ? -2 : -12;
  28         u16 eeprom;
  29         u8 offset0;
  30         u8 offset1;
  31 @@ -880,9 +881,9 @@ static int rt2800_agc_to_rssi(struct rt2
  32          * If the value in the descriptor is 0, it is considered invalid
  33          * and the default (extremely low) rssi value is assumed
  34          */
  35 -       rssi0 = (rssi0) ? (-12 - offset0 - rt2x00dev->lna_gain - rssi0) : -128;
  36 -       rssi1 = (rssi1) ? (-12 - offset1 - rt2x00dev->lna_gain - rssi1) : -128;
  37 -       rssi2 = (rssi2) ? (-12 - offset2 - rt2x00dev->lna_gain - rssi2) : -128;
  38 +       rssi0 = (rssi0) ? (base_val - offset0 - rt2x00dev->lna_gain - rssi0) : -128;
  39 +       rssi1 = (rssi1) ? (base_val - offset1 - rt2x00dev->lna_gain - rssi1) : -128;
  40 +       rssi2 = (rssi2) ? (base_val - offset2 - rt2x00dev->lna_gain - rssi2) : -128;
  41
  42         /*
  43          * mac80211 only accepts a single RSSI value. Calculating the