rtw88: 8821c: add false alarm statistics

False alarm statistics can be used to adjust the RX gain. This
helps the driver to adapt to different circumstances.

Implement rtw_chip_ops::false_alarm_statistics() for 8821c.
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Tzu-En Huang <tehuang@realtek.com>
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200616091625.26489-7-yhchuang@realtek.com

drivers/net/wireless/realtek/rtw88/rtw8821c.c

@@ -511,6 +511,58 @@ static void rtw8821c_set_tx_power_index(struct rtw_dev *rtwdev)
 	}
 }
 
+static void rtw8821c_false_alarm_statistics(struct rtw_dev *rtwdev)
+{
+	struct rtw_dm_info *dm_info = &rtwdev->dm_info;
+	u32 cck_enable;
+	u32 cck_fa_cnt;
+	u32 ofdm_fa_cnt;
+	u32 crc32_cnt;
+	u32 cca32_cnt;
+
+	cck_enable = rtw_read32(rtwdev, REG_RXPSEL) & BIT(28);
+	cck_fa_cnt = rtw_read16(rtwdev, REG_FA_CCK);
+	ofdm_fa_cnt = rtw_read16(rtwdev, REG_FA_OFDM);
+
+	dm_info->cck_fa_cnt = cck_fa_cnt;
+	dm_info->ofdm_fa_cnt = ofdm_fa_cnt;
+	if (cck_enable)
+		dm_info->total_fa_cnt += cck_fa_cnt;
+	dm_info->total_fa_cnt = ofdm_fa_cnt;
+
+	crc32_cnt = rtw_read32(rtwdev, REG_CRC_CCK);
+	dm_info->cck_ok_cnt = FIELD_GET(GENMASK(15, 0), crc32_cnt);
+	dm_info->cck_err_cnt = FIELD_GET(GENMASK(31, 16), crc32_cnt);
+
+	crc32_cnt = rtw_read32(rtwdev, REG_CRC_OFDM);
+	dm_info->ofdm_ok_cnt = FIELD_GET(GENMASK(15, 0), crc32_cnt);
+	dm_info->ofdm_err_cnt = FIELD_GET(GENMASK(31, 16), crc32_cnt);
+
+	crc32_cnt = rtw_read32(rtwdev, REG_CRC_HT);
+	dm_info->ht_ok_cnt = FIELD_GET(GENMASK(15, 0), crc32_cnt);
+	dm_info->ht_err_cnt = FIELD_GET(GENMASK(31, 16), crc32_cnt);
+
+	crc32_cnt = rtw_read32(rtwdev, REG_CRC_VHT);
+	dm_info->vht_ok_cnt = FIELD_GET(GENMASK(15, 0), crc32_cnt);
+	dm_info->vht_err_cnt = FIELD_GET(GENMASK(31, 16), crc32_cnt);
+
+	cca32_cnt = rtw_read32(rtwdev, REG_CCA_OFDM);
+	dm_info->ofdm_cca_cnt = FIELD_GET(GENMASK(31, 16), cca32_cnt);
+	dm_info->total_cca_cnt = dm_info->ofdm_cca_cnt;
+	if (cck_enable) {
+		cca32_cnt = rtw_read32(rtwdev, REG_CCA_CCK);
+		dm_info->cck_cca_cnt = FIELD_GET(GENMASK(15, 0), cca32_cnt);
+		dm_info->total_cca_cnt += dm_info->cck_cca_cnt;
+	}
+
+	rtw_write32_set(rtwdev, REG_FAS, BIT(17));
+	rtw_write32_clr(rtwdev, REG_FAS, BIT(17));
+	rtw_write32_clr(rtwdev, REG_RXDESC, BIT(15));
+	rtw_write32_set(rtwdev, REG_RXDESC, BIT(15));
+	rtw_write32_set(rtwdev, REG_CNTRST, BIT(0));
+	rtw_write32_clr(rtwdev, REG_CNTRST, BIT(0));
+}
+
 static struct rtw_pwr_seq_cmd trans_carddis_to_cardemu_8821c[] = {
 	{0x0086,
 	 RTW_PWR_CUT_ALL_MSK,
@@ -948,6 +1000,7 @@ static struct rtw_chip_ops rtw8821c_ops = {
 	.set_antenna		= NULL,
 	.set_tx_power_index	= rtw8821c_set_tx_power_index,
 	.cfg_ldo25		= rtw8821c_cfg_ldo25,
+	.false_alarm_statistics	= rtw8821c_false_alarm_statistics,
 };
 
 struct rtw_chip_info rtw8821c_hw_spec = {

drivers/net/wireless/realtek/rtw88/rtw8821c.h

@@ -183,13 +183,16 @@ _rtw_write32s_mask(struct rtw_dev *rtwdev, u32 addr, u32 mask, u32 data)
 #define REG_ACBB0	0x948
 #define REG_ACBBRXFIR	0x94c
 #define REG_ACGG2TBL	0x958
+#define REG_FAS		0x9a4
 #define REG_RXSB	0xa00
 #define REG_ADCINI	0xa04
 #define REG_TXSF2	0xa24
 #define REG_TXSF6	0xa28
+#define REG_FA_CCK	0xa5c
 #define REG_RXDESC	0xa2c
 #define REG_ENTXCCK	0xa80
 #define REG_TXFILTER	0xaac
+#define REG_CNTRST	0xb58
 #define REG_AGCTR_A	0xc08
 #define REG_TXSCALE_A	0xc1c
 #define REG_TXDFIR	0xc20
@@ -201,6 +204,13 @@ _rtw_write32s_mask(struct rtw_dev *rtwdev, u32 addr, u32 mask, u32 data)
 #define REG_RFEINV	0xcbc
 #define REG_AGCTR_B	0xe08
 #define REG_RXIGI_B	0xe50
+#define REG_CRC_CCK	0xf04
+#define REG_CRC_OFDM	0xf14
+#define REG_CRC_HT	0xf10
+#define REG_CRC_VHT	0xf0c
+#define REG_CCA_OFDM	0xf08
+#define REG_FA_OFDM	0xf48
+#define REG_CCA_CCK	0xfcc
 #define REG_ANTWT	0x1904
 #define REG_IQKFAILMSK	0x1bf0