package/kernel/mac80211/patches/rt2x00/999-wifi-rt2x00-fix-MT7620-low-RSSI-issue.patch

   1 From: Shiji Yang <yangshiji66@outlook.com>
   2 Date: Sat, 23 Sep 2023 07:51:39 +0800
   3 Subject: [PATCH] wifi: rt2x00: fix MT7620 low RSSI issue
   4
   5 On Mediatek vendor driver[1], MT7620 (RT6352) uses different RSSI
   6 base value '-2' compared to the other RT2x00 chips. This patch
   7 introduces the SoC specific base value to fix the low RSSI value
   8 reports on MT7620.
   9
  10 [1] Found on MT76x2E_MT7620_LinuxAP_V3.0.4.0_P3 ConvertToRssi().
  11
  12 Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
  13 ---
  14  drivers/net/wireless/ralink/rt2x00/rt2800lib.c | 7 ++++---
  15  1 file changed, 4 insertions(+), 3 deletions(-)
  16
  17 --- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
  18 +++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
  19 @@ -875,6 +875,7 @@ static int rt2800_agc_to_rssi(struct rt2
  20         s8 rssi0 = rt2x00_get_field32(rxwi_w2, RXWI_W2_RSSI0);
  21         s8 rssi1 = rt2x00_get_field32(rxwi_w2, RXWI_W2_RSSI1);
  22         s8 rssi2 = rt2x00_get_field32(rxwi_w2, RXWI_W2_RSSI2);
  23 +       s8 base_val = rt2x00_rt(rt2x00dev, RT6352) ? -2 : -12;
  24         u16 eeprom;
  25         u8 offset0;
  26         u8 offset1;
  27 @@ -899,9 +900,9 @@ static int rt2800_agc_to_rssi(struct rt2
  28          * If the value in the descriptor is 0, it is considered invalid
  29          * and the default (extremely low) rssi value is assumed
  30          */
  31 -       rssi0 = (rssi0) ? (-12 - offset0 - rt2x00dev->lna_gain - rssi0) : -128;
  32 -       rssi1 = (rssi1) ? (-12 - offset1 - rt2x00dev->lna_gain - rssi1) : -128;
  33 -       rssi2 = (rssi2) ? (-12 - offset2 - rt2x00dev->lna_gain - rssi2) : -128;
  34 +       rssi0 = (rssi0) ? (base_val - offset0 - rt2x00dev->lna_gain - rssi0) : -128;
  35 +       rssi1 = (rssi1) ? (base_val - offset1 - rt2x00dev->lna_gain - rssi1) : -128;
  36 +       rssi2 = (rssi2) ? (base_val - offset2 - rt2x00dev->lna_gain - rssi2) : -128;
  37
  38         /*
  39          * mac80211 only accepts a single RSSI value. Calculating the