wifi: rt2x00: add RXDCOC calibration for MT7620

Add RXDCOC calibration code from mtk driver.

Signed-off-by: Tomislav Požega <pozega.tomislav@gmail.com>
[fixed typo reported by Serge Vasilugin <vasilugin@yandex.ru>]
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Acked-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/850b30f652e88de30d79e968af4eb47aa5bc2511.1663445157.git.daniel@makrotopia.org

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
index df5038a59046fe7a3f7079fc319dd983333edc73..a785e6616c748a3e819c86c2319bbd2b044c0acf 100644 (file)
--- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
@@ -8607,6 +8607,65 @@ static void rt2800_r_calibration(struct rt2x00_dev *rt2x00dev)
        rt2800_register_write(rt2x00dev, PWR_PIN_CFG, MAC_PWR_PIN_CFG);
 }
 
+static void rt2800_rxdcoc_calibration(struct rt2x00_dev *rt2x00dev)
+{
+       u8 bbpreg = 0;
+       u32 macvalue = 0;
+       u8 saverfb0r2, saverfb5r4, saverfb7r4, rfvalue;
+       int i;
+
+       saverfb0r2 = rt2800_rfcsr_read_bank(rt2x00dev, 0, 2);
+       rfvalue = saverfb0r2;
+       rfvalue |= 0x03;
+       rt2800_rfcsr_write_bank(rt2x00dev, 0, 2, rfvalue);
+
+       rt2800_bbp_write(rt2x00dev, 158, 141);
+       bbpreg = rt2800_bbp_read(rt2x00dev, 159);
+       bbpreg |= 0x10;
+       rt2800_bbp_write(rt2x00dev, 159, bbpreg);
+
+       macvalue = rt2800_register_read(rt2x00dev, MAC_SYS_CTRL);
+       rt2800_register_write(rt2x00dev, MAC_SYS_CTRL, 0x8);
+
+       if (unlikely(rt2800_wait_bbp_rf_ready(rt2x00dev, MAC_STATUS_CFG_BBP_RF_BUSY_TX)))
+               rt2x00_warn(rt2x00dev, "RF TX busy in RX RXDCOC calibration\n");
+
+       saverfb5r4 = rt2800_rfcsr_read_bank(rt2x00dev, 5, 4);
+       saverfb7r4 = rt2800_rfcsr_read_bank(rt2x00dev, 7, 4);
+       saverfb5r4 = saverfb5r4 & (~0x40);
+       saverfb7r4 = saverfb7r4 & (~0x40);
+       rt2800_rfcsr_write_dccal(rt2x00dev, 4, 0x64);
+       rt2800_rfcsr_write_bank(rt2x00dev, 5, 4, saverfb5r4);
+       rt2800_rfcsr_write_bank(rt2x00dev, 7, 4, saverfb7r4);
+
+       rt2800_bbp_write(rt2x00dev, 158, 141);
+       bbpreg = rt2800_bbp_read(rt2x00dev, 159);
+       bbpreg = bbpreg & (~0x40);
+       rt2800_bbp_write(rt2x00dev, 159, bbpreg);
+       bbpreg |= 0x48;
+       rt2800_bbp_write(rt2x00dev, 159, bbpreg);
+
+       for (i = 0; i < 10000; i++) {
+               bbpreg = rt2800_bbp_read(rt2x00dev, 159);
+               if ((bbpreg & 0x40) == 0)
+                       break;
+               usleep_range(50, 100);
+       }
+
+       bbpreg = rt2800_bbp_read(rt2x00dev, 159);
+       bbpreg = bbpreg & (~0x40);
+       rt2800_bbp_write(rt2x00dev, 159, bbpreg);
+
+       rt2800_register_write(rt2x00dev, MAC_SYS_CTRL, macvalue);
+
+       rt2800_bbp_write(rt2x00dev, 158, 141);
+       bbpreg = rt2800_bbp_read(rt2x00dev, 159);
+       bbpreg &= (~0x10);
+       rt2800_bbp_write(rt2x00dev, 159, bbpreg);
+
+       rt2800_rfcsr_write_bank(rt2x00dev, 0, 2, saverfb0r2);
+}
+
 static void rt2800_bbp_core_soft_reset(struct rt2x00_dev *rt2x00dev,
                                       bool set_bw, bool is_ht40)
 {
@@ -9216,6 +9275,7 @@ static void rt2800_init_rfcsr_6352(struct rt2x00_dev *rt2x00dev)
 
        rt2800_r_calibration(rt2x00dev);
        rt2800_rf_self_txdc_cal(rt2x00dev);
+       rt2800_rxdcoc_calibration(rt2x00dev);
        rt2800_bw_filter_calibration(rt2x00dev, true);
        rt2800_bw_filter_calibration(rt2x00dev, false);
 }