wifi: rtl8xxxu: Report the RSSI to the firmware

Or in the case of RTL8188EU, report the RSSI to the rate control code.

The rate control code for RTL8188EU is less likely to switch to a lower
rate when the RSSI is high. The firmware-based rate control in the other
chips probably works the same way.

This affects all the chips, but it was only tested with RTL8188EU,
RTL8188FU, and RTL8192EU.

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/2aab4f3f-e914-4fe1-f29a-deac91774d05@gmail.com

8 files changed, 68 insertions, 0 deletions

diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
index be9479f969b7d9..90268479d3ad36 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
@@ -1168,6 +1168,26 @@ struct h2c_cmd {
 			u8 cmd;
 			u8 data;
 		} __packed bt_grant;
+		struct {
+			u8 cmd;
+			u8 macid;
+			u8 unknown0;
+			u8 rssi;
+			/*
+			 * [0]   - is_rx
+			 * [1]   - stbc_en
+			 * [2]   - noisy_decision
+			 * [6]   - bf_en
+			 */
+			u8 data;
+			/*
+			 * [0:6] - ra_th_offset
+			 * [7]   - ra_offset_direction
+			 */
+			u8 ra_th_offset;
+			u8 unknown1;
+			u8 unknown2;
+		} __packed rssi_report;
 	};
 };
 
@@ -1585,6 +1605,7 @@ struct rtl8xxxu_fileops {
 				  u32 ramask, u8 rateid, int sgi, int txbw_40mhz);
 	void (*report_connect) (struct rtl8xxxu_priv *priv,
 				u8 macid, bool connect);
+	void (*report_rssi) (struct rtl8xxxu_priv *priv, u8 macid, u8 rssi);
 	void (*fill_txdesc) (struct ieee80211_hw *hw, struct ieee80211_hdr *hdr,
 			     struct ieee80211_tx_info *tx_info,
 			     struct rtl8xxxu_txdesc32 *tx_desc, bool sgi,
@@ -1686,6 +1707,8 @@ void rtl8xxxu_gen1_report_connect(struct rtl8xxxu_priv *priv,
 				  u8 macid, bool connect);
 void rtl8xxxu_gen2_report_connect(struct rtl8xxxu_priv *priv,
 				  u8 macid, bool connect);
+void rtl8xxxu_gen1_report_rssi(struct rtl8xxxu_priv *priv, u8 macid, u8 rssi);
+void rtl8xxxu_gen2_report_rssi(struct rtl8xxxu_priv *priv, u8 macid, u8 rssi);
 void rtl8xxxu_gen1_init_aggregation(struct rtl8xxxu_priv *priv);
 void rtl8xxxu_gen1_enable_rf(struct rtl8xxxu_priv *priv);
 void rtl8xxxu_gen1_disable_rf(struct rtl8xxxu_priv *priv);
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c
index 37658a090aeee1..08f3b93ad8d03f 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c
@@ -1784,6 +1784,11 @@ rtl8188e_update_rate_mask(struct rtl8xxxu_priv *priv,
 	rtl8188e_arfb_refresh(ra);
 }
 
+static void rtl8188e_ra_set_rssi(struct rtl8xxxu_priv *priv, u8 macid, u8 rssi)
+{
+	priv->ra_info.rssi_sta_ra = rssi;
+}
+
 void rtl8188e_ra_info_init_all(struct rtl8xxxu_ra_info *ra)
 {
 	ra->decision_rate = DESC_RATE_MCS7;
@@ -1842,6 +1847,7 @@ struct rtl8xxxu_fileops rtl8188eu_fops = {
 	.set_tx_power = rtl8188f_set_tx_power,
 	.update_rate_mask = rtl8188e_update_rate_mask,
 	.report_connect = rtl8xxxu_gen2_report_connect,
+	.report_rssi = rtl8188e_ra_set_rssi,
 	.fill_txdesc = rtl8xxxu_fill_txdesc_v3,
 	.set_crystal_cap = rtl8188f_set_crystal_cap,
 	.cck_rssi = rtl8188e_cck_rssi,
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
index f5a0c7a8a581ba..af6e2c8a502549 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c
@@ -1732,6 +1732,7 @@ struct rtl8xxxu_fileops rtl8188fu_fops = {
 	.set_tx_power = rtl8188f_set_tx_power,
 	.update_rate_mask = rtl8xxxu_gen2_update_rate_mask,
 	.report_connect = rtl8xxxu_gen2_report_connect,
+	.report_rssi = rtl8xxxu_gen2_report_rssi,
 	.fill_txdesc = rtl8xxxu_fill_txdesc_v2,
 	.set_crystal_cap = rtl8188f_set_crystal_cap,
 	.cck_rssi = rtl8188f_cck_rssi,
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192c.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192c.c
index 8981a86c833f1e..e61d65c3579ba2 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192c.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192c.c
@@ -609,6 +609,7 @@ struct rtl8xxxu_fileops rtl8192cu_fops = {
 	.set_tx_power = rtl8xxxu_gen1_set_tx_power,
 	.update_rate_mask = rtl8xxxu_update_rate_mask,
 	.report_connect = rtl8xxxu_gen1_report_connect,
+	.report_rssi = rtl8xxxu_gen1_report_rssi,
 	.fill_txdesc = rtl8xxxu_fill_txdesc_v1,
 	.cck_rssi = rtl8723a_cck_rssi,
 	.writeN_block_size = 128,
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
index ca168860094718..4a1c9bcafe319f 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
@@ -1784,6 +1784,7 @@ struct rtl8xxxu_fileops rtl8192eu_fops = {
 	.set_tx_power = rtl8192e_set_tx_power,
 	.update_rate_mask = rtl8xxxu_gen2_update_rate_mask,
 	.report_connect = rtl8xxxu_gen2_report_connect,
+	.report_rssi = rtl8xxxu_gen2_report_rssi,
 	.fill_txdesc = rtl8xxxu_fill_txdesc_v2,
 	.set_crystal_cap = rtl8723a_set_crystal_cap,
 	.cck_rssi = rtl8192e_cck_rssi,
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723a.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723a.c
index e881ee33c6e81a..5ed523db2d87d5 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723a.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723a.c
@@ -478,6 +478,7 @@ struct rtl8xxxu_fileops rtl8723au_fops = {
 	.set_tx_power = rtl8xxxu_gen1_set_tx_power,
 	.update_rate_mask = rtl8xxxu_update_rate_mask,
 	.report_connect = rtl8xxxu_gen1_report_connect,
+	.report_rssi = rtl8xxxu_gen1_report_rssi,
 	.fill_txdesc = rtl8xxxu_fill_txdesc_v1,
 	.set_crystal_cap = rtl8723a_set_crystal_cap,
 	.cck_rssi = rtl8723a_cck_rssi,
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c
index 0ed667d5ed2564..21613d60dc2271 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c
@@ -1727,6 +1727,7 @@ struct rtl8xxxu_fileops rtl8723bu_fops = {
 	.set_tx_power = rtl8723b_set_tx_power,
 	.update_rate_mask = rtl8xxxu_gen2_update_rate_mask,
 	.report_connect = rtl8xxxu_gen2_report_connect,
+	.report_rssi = rtl8xxxu_gen2_report_rssi,
 	.fill_txdesc = rtl8xxxu_fill_txdesc_v2,
 	.set_crystal_cap = rtl8723a_set_crystal_cap,
 	.cck_rssi = rtl8723b_cck_rssi,
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index 03ffb99da7e2d6..edf9bfb9c94510 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -4461,6 +4461,37 @@ void rtl8xxxu_gen2_report_connect(struct rtl8xxxu_priv *priv,
 	rtl8xxxu_gen2_h2c_cmd(priv, &h2c, sizeof(h2c.media_status_rpt));
 }
 
+void rtl8xxxu_gen1_report_rssi(struct rtl8xxxu_priv *priv, u8 macid, u8 rssi)
+{
+	struct h2c_cmd h2c;
+	const int h2c_size = 4;
+
+	memset(&h2c, 0, sizeof(struct h2c_cmd));
+
+	h2c.rssi_report.cmd = H2C_SET_RSSI;
+	h2c.rssi_report.macid = macid;
+	h2c.rssi_report.rssi = rssi;
+
+	rtl8xxxu_gen1_h2c_cmd(priv, &h2c, h2c_size);
+}
+
+void rtl8xxxu_gen2_report_rssi(struct rtl8xxxu_priv *priv, u8 macid, u8 rssi)
+{
+	struct h2c_cmd h2c;
+	int h2c_size = sizeof(h2c.rssi_report);
+
+	if (priv->rtl_chip == RTL8723B)
+		h2c_size = 4;
+
+	memset(&h2c, 0, sizeof(struct h2c_cmd));
+
+	h2c.rssi_report.cmd = H2C_8723B_RSSI_SETTING;
+	h2c.rssi_report.macid = macid;
+	h2c.rssi_report.rssi = rssi;
+
+	rtl8xxxu_gen2_h2c_cmd(priv, &h2c, h2c_size);
+}
+
 void rtl8xxxu_gen1_init_aggregation(struct rtl8xxxu_priv *priv)
 {
 	u8 agg_ctrl, usb_spec, page_thresh, timeout;
@@ -6697,6 +6728,9 @@ static void rtl8xxxu_watchdog_callback(struct work_struct *work)
 
 		signal = ieee80211_ave_rssi(vif);
 
+		priv->fops->report_rssi(priv, 0,
+					rtl8xxxu_signal_to_snr(signal));
+
 		if (priv->fops->set_crystal_cap)
 			rtl8xxxu_track_cfo(priv);