rtw89: refine DIG feature to support 160M and CCK PD

DIG, which is short for dynamic initial gain, is used to adjust gain to get
good RX performance. CCK PD feature, a mechanism that adjusts 802.11b CCK
packet detection(PD) power threshold based on environment noisy level in
order to avoid false alarm. Also, refine related variable naming.
Signed-off-by: Johnson Lin <johnson.lin@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220121075555.12457-1-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/core.c

@@ -2563,6 +2563,13 @@ static void rtw89_read_chip_ver(struct rtw89_dev *rtwdev)
 	rtwdev->hal.cv = cv;
 }
 
+static void rtw89_core_setup_phycap(struct rtw89_dev *rtwdev)
+{
+	rtwdev->hal.support_cckpd =
+		!(rtwdev->chip->chip_id == RTL8852A && rtwdev->hal.cv <= CHIP_CBV) &&
+		!(rtwdev->chip->chip_id == RTL8852B && rtwdev->hal.cv <= CHIP_CAV);
+}
+
 static int rtw89_chip_efuse_info_setup(struct rtw89_dev *rtwdev)
 {
 	int ret;
@@ -2583,6 +2590,8 @@ static int rtw89_chip_efuse_info_setup(struct rtw89_dev *rtwdev)
 	if (ret)
 		return ret;
 
+	rtw89_core_setup_phycap(rtwdev);
+
 	rtw89_mac_pwr_off(rtwdev);
 
 	return 0;

drivers/net/wireless/realtek/rtw89/core.h

@@ -2378,6 +2378,7 @@ struct rtw89_hal {
 	u32 antenna_rx;
 	u8 tx_nss;
 	u8 rx_nss;
+	bool support_cckpd;
 };
 
 #define RTW89_MAX_MAC_ID_NUM 128

drivers/net/wireless/realtek/rtw89/phy.c

@@ -2855,7 +2855,9 @@ static void rtw89_phy_dig_dyn_pd_th(struct rtw89_dev *rtwdev, u8 rssi,
 	enum rtw89_bandwidth cbw = rtwdev->hal.current_band_width;
 	struct rtw89_dig_info *dig = &rtwdev->dig;
 	u8 final_rssi = 0, under_region = dig->pd_low_th_ofst;
-	u32 val = 0;
+	u8 ofdm_cca_th;
+	s8 cck_cca_th;
+	u32 pd_val = 0;
 
 	under_region += PD_TH_SB_FLTR_CMP_VAL;
 
@@ -2866,6 +2868,9 @@ static void rtw89_phy_dig_dyn_pd_th(struct rtw89_dev *rtwdev, u8 rssi,
 	case RTW89_CHANNEL_WIDTH_80:
 		under_region += PD_TH_BW80_CMP_VAL;
 		break;
+	case RTW89_CHANNEL_WIDTH_160:
+		under_region += PD_TH_BW160_CMP_VAL;
+		break;
 	case RTW89_CHANNEL_WIDTH_20:
 		fallthrough;
 	default:
@@ -2876,23 +2881,38 @@ static void rtw89_phy_dig_dyn_pd_th(struct rtw89_dev *rtwdev, u8 rssi,
 	dig->dyn_pd_th_max = dig->igi_rssi;
 
 	final_rssi = min_t(u8, rssi, dig->igi_rssi);
-	final_rssi = clamp_t(u8, final_rssi, PD_TH_MIN_RSSI + under_region,
+	ofdm_cca_th = clamp_t(u8, final_rssi, PD_TH_MIN_RSSI + under_region,
 			      PD_TH_MAX_RSSI + under_region);
 
 	if (enable) {
-		val = (final_rssi - under_region - PD_TH_MIN_RSSI) >> 1;
+		pd_val = (ofdm_cca_th - under_region - PD_TH_MIN_RSSI) >> 1;
 		rtw89_debug(rtwdev, RTW89_DBG_DIG,
-			    "dyn_max=%d, final_rssi=%d, total=%d, PD_low=%d\n",
-			    dig->igi_rssi, final_rssi, under_region, val);
+			    "igi=%d, ofdm_ccaTH=%d, backoff=%d, PD_low=%d\n",
+			    final_rssi, ofdm_cca_th, under_region, pd_val);
 	} else {
 		rtw89_debug(rtwdev, RTW89_DBG_DIG,
 			    "Dynamic PD th disabled, Set PD_low_bd=0\n");
 	}
 
 	rtw89_phy_write32_mask(rtwdev, R_SEG0R_PD, B_SEG0R_PD_LOWER_BOUND_MSK,
-			       val);
+			       pd_val);
 	rtw89_phy_write32_mask(rtwdev, R_SEG0R_PD,
 			       B_SEG0R_PD_SPATIAL_REUSE_EN_MSK, enable);
+
+	if (!rtwdev->hal.support_cckpd)
+		return;
+
+	cck_cca_th = max_t(s8, final_rssi - under_region, CCKPD_TH_MIN_RSSI);
+	pd_val = (u32)(cck_cca_th - IGI_RSSI_MAX);
+
+	rtw89_debug(rtwdev, RTW89_DBG_DIG,
+		    "igi=%d, cck_ccaTH=%d, backoff=%d, cck_PD_low=((%d))dB\n",
+		    final_rssi, cck_cca_th, under_region, pd_val);
+
+	rtw89_phy_write32_mask(rtwdev, R_BMODE_PDTH_EN_V1,
+			       B_BMODE_PDTH_LIMIT_EN_MSK_V1, enable);
+	rtw89_phy_write32_mask(rtwdev, R_BMODE_PDTH_V1,
+			       B_BMODE_PDTH_LOWER_BOUND_MSK_V1, pd_val);
 }
 
 void rtw89_phy_dig_reset(struct rtw89_dev *rtwdev)

drivers/net/wireless/realtek/rtw89/phy.h

@@ -87,8 +87,11 @@
 #define RXB_IDX_MAX 31
 #define RXB_IDX_MIN 0
 
+#define IGI_RSSI_MAX 110
 #define PD_TH_MAX_RSSI 70
 #define PD_TH_MIN_RSSI 8
+#define CCKPD_TH_MIN_RSSI (-18)
+#define PD_TH_BW160_CMP_VAL 9
 #define PD_TH_BW80_CMP_VAL 6
 #define PD_TH_BW40_CMP_VAL 3
 #define PD_TH_BW20_CMP_VAL 0

drivers/net/wireless/realtek/rtw89/reg.h

@@ -1971,6 +1971,10 @@
 #define R_CHBW_MOD 0x4978
 #define B_CHBW_MOD_PRICH GENMASK(11, 8)
 #define B_CHBW_MOD_SBW GENMASK(13, 12)
+#define R_BMODE_PDTH_V1 0x4B64
+#define B_BMODE_PDTH_LOWER_BOUND_MSK_V1 GENMASK(31, 24)
+#define R_BMODE_PDTH_EN_V1 0x4B74
+#define B_BMODE_PDTH_LIMIT_EN_MSK_V1 BIT(30)
 #define R_CFO_COMP_SEG1_L 0x5384
 #define R_CFO_COMP_SEG1_H 0x5388
 #define R_CFO_COMP_SEG1_CTRL 0x538C