Some mt7601 devices cannot establish a connection properly.
This patch fixes the issue.
We do not know why, but it just works.

Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1716301/comments/52
Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1716301/comments/53
Link: https://github.com/kuba-moo/mt7601u/issues/64
Link: https://www.mediatek.com/products/broadband-wifi/mt7601u
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>
Signed-off-by: WangYuli <wangyuli@uniontech.com>
---
 drivers/net/wireless/mediatek/mt7601u/mcu.c | 1 -
 drivers/net/wireless/mediatek/mt7601u/phy.c | 5 -----
 2 files changed, 6 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt7601u/mcu.c b/drivers/net/wireless/mediatek/mt7601u/mcu.c
index 1b5cc271a9e1..15751d11b4dc 100644
--- a/drivers/net/wireless/mediatek/mt7601u/mcu.c
+++ b/drivers/net/wireless/mediatek/mt7601u/mcu.c
@@ -446,7 +446,6 @@ static int mt7601u_load_firmware(struct mt7601u_dev *dev)
 	mt7601u_wr(dev, 0x94c, 0);
 	mt7601u_wr(dev, MT_FCE_PSE_CTRL, 0);
 
-	mt7601u_vendor_reset(dev);
 	msleep(5);
 
 	mt7601u_wr(dev, 0xa44, 0);
diff --git a/drivers/net/wireless/mediatek/mt7601u/phy.c b/drivers/net/wireless/mediatek/mt7601u/phy.c
index d4cd2215aba9..f3c14a1552df 100644
--- a/drivers/net/wireless/mediatek/mt7601u/phy.c
+++ b/drivers/net/wireless/mediatek/mt7601u/phy.c
@@ -589,8 +589,6 @@ void mt7601u_phy_recalibrate_after_assoc(struct mt7601u_dev *dev)
 	if (test_bit(MT7601U_STATE_REMOVED, &dev->state))
 		return;
 
-	mt7601u_mcu_calibrate(dev, MCU_CAL_DPD, dev->curr_temp);
-
 	mt7601u_rxdc_cal(dev);
 }
 
@@ -1160,9 +1158,6 @@ static int mt7601u_init_cal(struct mt7601u_dev *dev)
 	if (ret)
 		return ret;
 	ret = mt7601u_mcu_calibrate(dev, MCU_CAL_RXIQ, 0);
-	if (ret)
-		return ret;
-	ret = mt7601u_mcu_calibrate(dev, MCU_CAL_DPD, dev->dpd_temp);
 	if (ret)
 		return ret;
 
-- 
2.43.4

On Mon, 15 Jul 2024 17:47:14 +0800 WangYuli wrote:
> Some mt7601 devices cannot establish a connection properly.
> This patch fixes the issue.
> We do not know why, but it just works.

Any chance we can gate this on the version of EEPROM or chip or
something else? It'd be good to avoid regressions on older devices.
Or possibly - could we issue the MCU command as a test and disable
the calibration if it fails?