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wifi: rtw88: Increase the RX gain before scanning

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The driver reduces the RX gain while connected to a network located
close by. In this condition scans return few results because the more
distant networks can't be heard.

Temporarily increase the RX gain before scanning in order to detect
all available networks. Reset the RX gain back to the last recorded
value once the scan finishes.

Link: https://github.com/lwfinger/rtw88/issues/337
Signed-off-by: Martin Hrůza <martin.hruza123@gmail.com>
Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/c2e72aff-190d-4f59-9914-2588de756385@gmail.com
This commit is contained in:
Martin Hrůza 2025-12-24 01:19:00 +02:00 committed by Ping-Ke Shih
parent 1b40c1c757
commit 3f90942473
3 changed files with 25 additions and 0 deletions
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3
drivers/net/wireless/realtek/rtw88/main.c
View File

@ -1483,6 +1483,8 @@ void rtw_core_scan_start(struct rtw_dev *rtwdev, struct rtw_vif *rtwvif,
set_bit(RTW_FLAG_DIG_DISABLE, rtwdev->flags);
set_bit(RTW_FLAG_SCANNING, rtwdev->flags);
rtw_phy_dig_set_max_coverage(rtwdev);
}
void rtw_core_scan_complete(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
@ -1494,6 +1496,7 @@ void rtw_core_scan_complete(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
if (!rtwvif)
return;
rtw_phy_dig_reset(rtwdev);
clear_bit(RTW_FLAG_SCANNING, rtwdev->flags);
clear_bit(RTW_FLAG_DIG_DISABLE, rtwdev->flags);

20
drivers/net/wireless/realtek/rtw88/phy.c
View File

@ -370,6 +370,26 @@ static void rtw_phy_statistics(struct rtw_dev *rtwdev)
#define DIG_CVRG_MIN 0x1c
#define DIG_RSSI_GAIN_OFFSET 15
void rtw_phy_dig_set_max_coverage(struct rtw_dev *rtwdev)
{
/* Lower values result in greater coverage. */
rtw_dbg(rtwdev, RTW_DBG_PHY, "Setting IGI=%#x for max coverage\n",
DIG_CVRG_MIN);
rtw_phy_dig_write(rtwdev, DIG_CVRG_MIN);
}
void rtw_phy_dig_reset(struct rtw_dev *rtwdev)
{
struct rtw_dm_info *dm_info = &rtwdev->dm_info;
u8 last_igi;
last_igi = dm_info->igi_history[0];
rtw_dbg(rtwdev, RTW_DBG_PHY, "Resetting IGI=%#x\n", last_igi);
rtw_phy_dig_write(rtwdev, last_igi);
}
static bool
rtw_phy_dig_check_damping(struct rtw_dm_info *dm_info)
{

2
drivers/net/wireless/realtek/rtw88/phy.h
View File

@ -146,6 +146,8 @@ static inline int rtw_check_supported_rfe(struct rtw_dev *rtwdev)
}
void rtw_phy_dig_write(struct rtw_dev *rtwdev, u8 igi);
void rtw_phy_dig_reset(struct rtw_dev *rtwdev);
void rtw_phy_dig_set_max_coverage(struct rtw_dev *rtwdev);
struct rtw_power_params {
u8 pwr_base;