rtw88: 8723d: Add LC calibration

LC calibration is done by hardware circuit. Driver sets the LCK bit to kick
start, and then poll the bit to check if it's done.
Signed-off-by: Ping-Ke Shih <pkshih@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/20200512102621.5148-2-yhchuang@realtek.com

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

@@ -11,6 +11,7 @@
 #include <linux/average.h>
 #include <linux/bitops.h>
 #include <linux/bitfield.h>
+#include <linux/iopoll.h>
 #include <linux/interrupt.h>
 
 #include "util.h"

drivers/net/wireless/realtek/rtw88/rtw8723d.c

@@ -64,6 +64,34 @@ static const struct rtw_hw_reg rtw8723d_txagc[] = {
 #define WLAN_LTR_CTRL1		0xCB004010
 #define WLAN_LTR_CTRL2		0x01233425
 
+static void rtw8723d_lck(struct rtw_dev *rtwdev)
+{
+	u32 lc_cal;
+	u8 val_ctx, rf_val;
+	int ret;
+
+	val_ctx = rtw_read8(rtwdev, REG_CTX);
+	if ((val_ctx & BIT_MASK_CTX_TYPE) != 0)
+		rtw_write8(rtwdev, REG_CTX, val_ctx & ~BIT_MASK_CTX_TYPE);
+	else
+		rtw_write8(rtwdev, REG_TXPAUSE, 0xFF);
+	lc_cal = rtw_read_rf(rtwdev, RF_PATH_A, RF_CFGCH, RFREG_MASK);
+
+	rtw_write_rf(rtwdev, RF_PATH_A, RF_CFGCH, RFREG_MASK, lc_cal | BIT_LCK);
+
+	ret = read_poll_timeout(rtw_read_rf, rf_val, rf_val != 0x1,
+				10000, 1000000, false,
+				rtwdev, RF_PATH_A, RF_CFGCH, BIT_LCK);
+	if (ret)
+		rtw_warn(rtwdev, "failed to poll LCK status bit\n");
+
+	rtw_write_rf(rtwdev, RF_PATH_A, RF_CFGCH, RFREG_MASK, lc_cal);
+	if ((val_ctx & BIT_MASK_CTX_TYPE) != 0)
+		rtw_write8(rtwdev, REG_CTX, val_ctx);
+	else
+		rtw_write8(rtwdev, REG_TXPAUSE, 0x00);
+}
+
 static void rtw8723d_phy_set_param(struct rtw_dev *rtwdev)
 {
 	u8 xtal_cap;
@@ -125,6 +153,9 @@ static void rtw8723d_phy_set_param(struct rtw_dev *rtwdev)
 	rtw_phy_init(rtwdev);
 
 	rtw_write16_set(rtwdev, REG_TXDMA_OFFSET_CHK, BIT_DROP_DATA_EN);
+
+	rtw8723d_lck(rtwdev);
+
 	rtw_write32_mask(rtwdev, REG_OFDM0_XAAGC1, MASKBYTE0, 0x50);
 	rtw_write32_mask(rtwdev, REG_OFDM0_XAAGC1, MASKBYTE0, 0x20);
 }

drivers/net/wireless/realtek/rtw88/rtw8723d.h

@@ -78,6 +78,7 @@ struct rtw8723d_efuse {
 #define RFCFGCH_BW_20M		(BIT(11) | BIT(10))
 #define RFCFGCH_BW_40M		BIT(10)
 #define BIT_MASK_RFMOD		BIT(0)
+#define BIT_LCK			BIT(15)
 
 #define REG_PSDFN		0x0808
 #define REG_ANALOG_P4		0x088c
@@ -115,6 +116,8 @@ struct rtw8723d_efuse {
 #define REG_OFDM_FA_RSTD_11N	0x0d00
 #define BIT_MASK_OFDM_FA_RST1	BIT(27)
 #define BIT_MASK_OFDM_FA_KEEP1	BIT(31)
+#define REG_CTX			0x0d03
+#define BIT_MASK_CTX_TYPE	GENMASK(6, 4)
 #define REG_OFDM1_CFOTRK	0x0d2c
 #define BIT_EN_CFOTRK		BIT(28)
 #define REG_OFDM1_CSI1		0x0d40