rtw88: 8822c: debug: allow debugfs to enable/disable TXGAPK

Use "cat dm_cap" to show all features; where, prefix +/- means feature is
enabled/disabled:

$ cat dm_cap
DM capability 0x00000002
( 1) +TXGAPK

To control dm_cap:
use "echo +1 > dm_cap" to enable TXGAPK
use "echo -1 > dm_cap" to disable TXGAPK

Below is an example to disable TXGAPK.

$ echo -1 > dm_cap
$ cat dm_cap
DM capability 0x00000000
( 1) -TXGAPK

Below is an example to show TXGAPK status
$ echo 1 > dm_cap; cat dm_cap

( 1) +TXGAPK

path 0:
0x56 = 0x88c89
[TXGAPK] offset 1 0
[TXGAPK] offset 1 1
[TXGAPK] offset 1 2
[TXGAPK] offset 1 3
[TXGAPK] offset 0 4
[TXGAPK] offset 0 5
[TXGAPK] offset 0 6
[TXGAPK] offset 0 7
[TXGAPK] offset 0 8
[TXGAPK] offset 0 9

path 1:
0x56 = 0x89c89
[TXGAPK] offset 1 0
[TXGAPK] offset 1 1
[TXGAPK] offset 1 2
[TXGAPK] offset 1 3
[TXGAPK] offset 0 4
[TXGAPK] offset 0 5
[TXGAPK] offset 0 6
[TXGAPK] offset 0 7
[TXGAPK] offset 0 8
[TXGAPK] offset 0 9

Signed-off-by: Guo-Feng Fan <vincent_fann@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210419003748.3224-4-pkshih@realtek.com

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

@@ -35,9 +35,17 @@ struct rtw_debugfs_priv {
 			u32 addr;
 			u32 len;
 		} read_reg;
+		struct {
+			u8 bit;
+		} dm_cap;
 	};
 };
 
+static const char * const rtw_dm_cap_strs[] = {
+	[RTW_DM_CAP_NA] = "NA",
+	[RTW_DM_CAP_TXGAPK] = "TXGAPK",
+};
+
 static int rtw_debugfs_single_show(struct seq_file *m, void *v)
 {
 	struct rtw_debugfs_priv *debugfs_priv = m->private;
@@ -853,6 +861,83 @@ static int rtw_debugfs_get_fw_crash(struct seq_file *m, void *v)
 	return 0;
 }
 
+static ssize_t rtw_debugfs_set_dm_cap(struct file *filp,
+				      const char __user *buffer,
+				      size_t count, loff_t *loff)
+{
+	struct seq_file *seqpriv = (struct seq_file *)filp->private_data;
+	struct rtw_debugfs_priv *debugfs_priv = seqpriv->private;
+	struct rtw_dev *rtwdev = debugfs_priv->rtwdev;
+	struct rtw_dm_info *dm_info = &rtwdev->dm_info;
+	int bit;
+	bool en;
+
+	if (kstrtoint_from_user(buffer, count, 10, &bit))
+		return -EINVAL;
+
+	en = bit > 0;
+	bit = abs(bit);
+
+	if (bit >= RTW_DM_CAP_NUM) {
+		rtw_warn(rtwdev, "unknown DM CAP %d\n", bit);
+		return -EINVAL;
+	}
+
+	if (en)
+		dm_info->dm_flags &= ~BIT(bit);
+	else
+		dm_info->dm_flags |= BIT(bit);
+
+	debugfs_priv->dm_cap.bit = bit;
+
+	return count;
+}
+
+static void dump_gapk_status(struct rtw_dev *rtwdev, struct seq_file *m)
+{
+	struct rtw_dm_info *dm_info = &rtwdev->dm_info;
+	struct rtw_gapk_info *txgapk = &rtwdev->dm_info.gapk;
+	int i, path;
+	u32 val;
+
+	seq_printf(m, "\n(%2d) %c%s\n\n", RTW_DM_CAP_TXGAPK,
+		   dm_info->dm_flags & BIT(RTW_DM_CAP_TXGAPK) ? '-' : '+',
+		   rtw_dm_cap_strs[RTW_DM_CAP_TXGAPK]);
+
+	for (path = 0; path < rtwdev->hal.rf_path_num; path++) {
+		val = rtw_read_rf(rtwdev, path, RF_GAINTX, RFREG_MASK);
+		seq_printf(m, "path %d:\n0x%x = 0x%x\n", path, RF_GAINTX, val);
+
+		for (i = 0; i < RF_HW_OFFSET_NUM; i++)
+			seq_printf(m, "[TXGAPK] offset %d %d\n",
+				   txgapk->rf3f_fs[path][i], i);
+		seq_puts(m, "\n");
+	}
+}
+
+static int rtw_debugfs_get_dm_cap(struct seq_file *m, void *v)
+{
+	struct rtw_debugfs_priv *debugfs_priv = m->private;
+	struct rtw_dev *rtwdev = debugfs_priv->rtwdev;
+	struct rtw_dm_info *dm_info = &rtwdev->dm_info;
+	int i;
+
+	switch (debugfs_priv->dm_cap.bit) {
+	case RTW_DM_CAP_TXGAPK:
+		dump_gapk_status(rtwdev, m);
+		break;
+	default:
+		for (i = 1; i < RTW_DM_CAP_NUM; i++) {
+			seq_printf(m, "(%2d) %c%s\n", i,
+				   dm_info->dm_flags & BIT(i) ? '-' : '+',
+				   rtw_dm_cap_strs[i]);
+		}
+		break;
+	}
+	debugfs_priv->dm_cap.bit = RTW_DM_CAP_NA;
+	return 0;
+}
+
 #define rtw_debug_impl_mac(page, addr)				\
 static struct rtw_debugfs_priv rtw_debug_priv_mac_ ##page = {	\
 	.cb_read = rtw_debug_get_mac_page,			\
@@ -961,6 +1046,11 @@ static struct rtw_debugfs_priv rtw_debug_priv_fw_crash = {
 	.cb_read = rtw_debugfs_get_fw_crash,
 };
 
+static struct rtw_debugfs_priv rtw_debug_priv_dm_cap = {
+	.cb_write = rtw_debugfs_set_dm_cap,
+	.cb_read = rtw_debugfs_get_dm_cap,
+};
+
 #define rtw_debugfs_add_core(name, mode, fopname, parent)		\
 	do {								\
 		rtw_debug_priv_ ##name.rtwdev = rtwdev;			\
@@ -1035,6 +1125,7 @@ void rtw_debugfs_init(struct rtw_dev *rtwdev)
 	rtw_debugfs_add_r(rf_dump);
 	rtw_debugfs_add_r(tx_pwr_tbl);
 	rtw_debugfs_add_rw(fw_crash);
+	rtw_debugfs_add_rw(dm_cap);
 }
 
 #endif /* CONFIG_RTW88_DEBUGFS */

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

@@ -1516,6 +1516,7 @@ enum rtw_rf_band {
 
 struct rtw_gapk_info {
 	u32 rf3f_bp[RF_BAND_MAX][RF_GAIN_NUM][RTW_RF_PATH_MAX];
+	u32 rf3f_fs[RTW_RF_PATH_MAX][RF_GAIN_NUM];
 	bool txgapk_bp_done;
 	s8 offset[RF_GAIN_NUM][RTW_RF_PATH_MAX];
 	s8 fianl_offset[RF_GAIN_NUM][RTW_RF_PATH_MAX];
@@ -1535,6 +1536,12 @@ struct rtw_cfo_track {
 #define RRSR_INIT_2G 0x15f
 #define RRSR_INIT_5G 0x150
 
+enum rtw_dm_cap {
+	RTW_DM_CAP_NA,
+	RTW_DM_CAP_TXGAPK,
+	RTW_DM_CAP_NUM
+};
+
 struct rtw_dm_info {
 	u32 cck_fa_cnt;
 	u32 ofdm_fa_cnt;
@@ -1603,6 +1610,7 @@ struct rtw_dm_info {
 	struct ewma_evm ewma_evm[RTW_EVM_NUM];
 	struct ewma_snr ewma_snr[RTW_SNR_NUM];
 
+	u32 dm_flags; /* enum rtw_dm_cap */
 	struct rtw_iqk_info iqk;
 	struct rtw_gapk_info gapk;
 	bool is_bt_iqk_timeout;

drivers/net/wireless/realtek/rtw88/rtw8822c.c

@@ -1665,14 +1665,16 @@ static void rtw8822c_txgapk_write_tx_gain(struct rtw_dev *rtwdev)
 			}
 
 			v = txgapk->rf3f_bp[band][i][path];
-			if (_rtw8822c_txgapk_gain_valid(rtwdev, v))
+			if (_rtw8822c_txgapk_gain_valid(rtwdev, v)) {
 				rtw_dbg(rtwdev, RTW_DBG_RFK,
 					"[TXGAPK] tx_gain=0x%03X >= 0xCEX\n",
 					txgapk->rf3f_bp[band][i][path]);
-			else
+			} else {
+				txgapk->rf3f_fs[path][i] = offset_tmp[i];
 				rtw_dbg(rtwdev, RTW_DBG_RFK,
 					"[TXGAPK] offset %d %d\n",
 					offset_tmp[i], i);
+			}
 		}
 
 		rtw_write_rf(rtwdev, path, RF_LUTWE2, RFREG_MASK, 0x10000);
@@ -1704,6 +1706,9 @@ static void rtw8822c_txgapk_save_all_tx_gain_table(struct rtw_dev *rtwdev)
 	u8 path, band, gain, rf0_idx;
 	u32 rf18, v;
 
+	if (rtwdev->dm_info.dm_flags & BIT(RTW_DM_CAP_TXGAPK))
+		return;
+
 	rtw_dbg(rtwdev, RTW_DBG_RFK, "[TXGAPK] ======>%s\n", __func__);
 
 	if (txgapk->read_txgain == 1) {
@@ -1794,6 +1799,12 @@ static void rtw8822c_txgapk(struct rtw_dev *rtwdev)
 
 static void rtw8822c_do_gapk(struct rtw_dev *rtwdev)
 {
+	struct rtw_dm_info *dm = &rtwdev->dm_info;
+
+	if (dm->dm_flags & BIT(RTW_DM_CAP_TXGAPK)) {
+		rtw_dbg(rtwdev, RTW_DBG_RFK, "[TXGAPK] feature disable!!!\n");
+		return;
+	}
 	rtw8822c_rfk_handshake(rtwdev, true);
 	rtw8822c_txgapk(rtwdev);
 	rtw8822c_rfk_handshake(rtwdev, false);