mt76x0: phy: add phy/vco temperature compensation

Introduce phy/vco temperature calibration.
Moreover fix configuration of register 67 on bank0
during temperature reading and use mt76_poll utility routine
to poll core34 register.
Furthermore temperature compensation needs to be disabled
if the device supports tssi compensation.
This issue has never been hit since temperature reading is not
actually used by usb code.

Fixes: 10de7a8 ("mt76x0: phy files")
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76x0/phy.c

@@ -14,6 +14,9 @@
  * GNU General Public License for more details.
  */
 
+#include <linux/kernel.h>
+#include <linux/etherdevice.h>
+
 #include "mt76x0.h"
 #include "mcu.h"
 #include "eeprom.h"
@@ -23,8 +26,6 @@
 #include "initvals_phy.h"
 #include "../mt76x02_phy.h"
 
-#include <linux/etherdevice.h>
-
 static int
 mt76x0_rf_csr_wr(struct mt76x02_dev *dev, u32 offset, u8 value)
 {
@@ -782,45 +783,41 @@ void mt76x0_agc_restore(struct mt76x02_dev *dev)
 static void mt76x0_temp_sensor(struct mt76x02_dev *dev)
 {
 	u8 rf_b7_73, rf_b0_66, rf_b0_67;
-	int cycle, temp;
-	u32 val;
-	s32 sval;
+	s8 val;
 
 	rf_b7_73 = rf_rr(dev, MT_RF(7, 73));
 	rf_b0_66 = rf_rr(dev, MT_RF(0, 66));
-	rf_b0_67 = rf_rr(dev, MT_RF(0, 73));
+	rf_b0_67 = rf_rr(dev, MT_RF(0, 67));
 
 	rf_wr(dev, MT_RF(7, 73), 0x02);
 	rf_wr(dev, MT_RF(0, 66), 0x23);
-	rf_wr(dev, MT_RF(0, 73), 0x01);
+	rf_wr(dev, MT_RF(0, 67), 0x01);
 
 	mt76_wr(dev, MT_BBP(CORE, 34), 0x00080055);
 
-	for (cycle = 0; cycle < 2000; cycle++) {
-		val = mt76_rr(dev, MT_BBP(CORE, 34));
-		if (!(val & 0x10))
-			break;
-		udelay(3);
-	}
-
-	if (cycle >= 2000) {
-		val &= 0x10;
-		mt76_wr(dev, MT_BBP(CORE, 34), val);
+	if (!mt76_poll(dev, MT_BBP(CORE, 34), BIT(4), 0, 2000)) {
+		mt76_clear(dev, MT_BBP(CORE, 34), BIT(4));
 		goto done;
 	}
 
-	sval = mt76_rr(dev, MT_BBP(CORE, 35)) & 0xff;
-	if (!(sval & 0x80))
-		sval &= 0x7f; /* Positive */
-	else
-		sval |= 0xffffff00; /* Negative */
+	val = mt76_rr(dev, MT_BBP(CORE, 35));
+	val = (35 * (val - dev->cal.rx.temp_offset)) / 10 + 25;
 
-	temp = (35 * (sval - dev->cal.rx.temp_offset)) / 10 + 25;
+	if (abs(val - dev->cal.temp_vco) > 20) {
+		mt76x02_mcu_calibrate(dev, MCU_CAL_VCO,
+				      dev->mt76.chandef.chan->hw_value,
+				      false);
+		dev->cal.temp_vco = val;
+	}
+	if (abs(val - dev->cal.temp) > 30) {
+		mt76x0_phy_calibrate(dev, false);
+		dev->cal.temp = val;
+	}
 
 done:
 	rf_wr(dev, MT_RF(7, 73), rf_b7_73);
 	rf_wr(dev, MT_RF(0, 66), rf_b0_66);
-	rf_wr(dev, MT_RF(0, 73), rf_b0_67);
+	rf_wr(dev, MT_RF(0, 67), rf_b0_67);
 }
 
 static void mt76x0_dynamic_vga_tuning(struct mt76x02_dev *dev)
@@ -848,7 +845,8 @@ static void mt76x0_phy_calibration_work(struct work_struct *work)
 					       cal_work.work);
 
 	mt76x0_dynamic_vga_tuning(dev);
-	mt76x0_temp_sensor(dev);
+	if (!mt76x0_tssi_enabled(dev))
+		mt76x0_temp_sensor(dev);
 
 	ieee80211_queue_delayed_work(dev->mt76.hw, &dev->cal_work,
 				     MT_CALIBRATE_INTERVAL);

drivers/net/wireless/mediatek/mt76/mt76x02.h

@@ -55,7 +55,8 @@ struct mt76x02_calibration {
 	s8 agc_gain_adjust;
 	s8 low_gain;
 
-	u8 temp;
+	s8 temp_vco;
+	s8 temp;
 
 	bool init_cal_done;
 	bool tssi_cal_done;