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Subject[PATCH 4.20 111/117] mt76x0: use band parameter for LC calibration
Date
4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stanislaw Gruszka <sgruszka@redhat.com>

commit ad3f993a0857ad3b792e7463828eb0d90cdd6f4d upstream.

We use always 1 as band parameter for MCU_CAL_LC, this break 2GHz,
we should use 0 for this band instead.

Patch fixes problems happened sometimes when try to associate with 2GHz
AP and manifest by errors like below:

[14680.920823] wlan0: authenticate with 18:31:bf:c0:51:b0
[14681.109506] wlan0: send auth to 18:31:bf:c0:51:b0 (try 1/3)
[14681.310454] wlan0: send auth to 18:31:bf:c0:51:b0 (try 2/3)
[14681.518469] wlan0: send auth to 18:31:bf:c0:51:b0 (try 3/3)
[14681.726499] wlan0: authentication with 18:31:bf:c0:51:b0 timed out

Fixes: 9aec146d0f6b ("mt76x0: pci: introduce mt76x0_phy_calirate routine")
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/net/wireless/mediatek/mt76/mt76x0/phy.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/mediatek/mt76/mt76x0/phy.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x0/phy.c
@@ -585,6 +585,7 @@ void mt76x0_phy_set_txpower(struct mt76x
void mt76x0_phy_calibrate(struct mt76x02_dev *dev, bool power_on)
{
struct ieee80211_channel *chan = dev->mt76.chandef.chan;
+ int is_5ghz = (chan->band == NL80211_BAND_5GHZ) ? 1 : 0;
u32 val, tx_alc, reg_val;

if (power_on) {
@@ -602,7 +603,7 @@ void mt76x0_phy_calibrate(struct mt76x02
reg_val = mt76_rr(dev, MT_BBP(IBI, 9));
mt76_wr(dev, MT_BBP(IBI, 9), 0xffffff7e);

- if (chan->band == NL80211_BAND_5GHZ) {
+ if (is_5ghz) {
if (chan->hw_value < 100)
val = 0x701;
else if (chan->hw_value < 140)
@@ -615,7 +616,7 @@ void mt76x0_phy_calibrate(struct mt76x02

mt76x02_mcu_calibrate(dev, MCU_CAL_FULL, val, false);
msleep(350);
- mt76x02_mcu_calibrate(dev, MCU_CAL_LC, 1, false);
+ mt76x02_mcu_calibrate(dev, MCU_CAL_LC, is_5ghz, false);
usleep_range(15000, 20000);

mt76_wr(dev, MT_BBP(IBI, 9), reg_val);

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