[PATCH v2] mt76x0: run calibration after scanning

[Stanislaw Gruszka <sgruszka@redhat.com>]

If we are associated and scanning is performed, sw_scan_complete callback
is done after we get back to operating channel, so we do not perform
queue cal work. Fix this queue cal work from sw_scan_complete().

We have to restore gain in MT_BBP(AGC, 8) register after scanning, as
it was multiple times modified by channel switch code. So queue cal work
without  any delay and reset dev->cal.low_gain to assure calibration
code will AGC gain value.

Note patch was not tested on mt76x2, but should work and be needed
fix as well.

Fixes: bbd10586f0df ("mt76x0: phy: do not run calibration during channel switch")
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
---
v1 -> v2:
only queue cal work with 0 delay an reset dev->cal.low_gain 

 drivers/net/wireless/mediatek/mt76/mt76x02_util.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
index 9f083008dbd4..747fd2c9ec45 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
@@ -553,6 +553,12 @@ void mt76x02_sw_scan_complete(struct ieee80211_hw *hw,
 	clear_bit(MT76_SCANNING, &dev->mt76.state);
 	if (mt76_is_mmio(dev))
 		tasklet_enable(&dev->pre_tbtt_tasklet);
+
+	if (vif->bss_conf.assoc) {
+		/* Restore AGC gain and resume calibration after scanning. */
+		dev->cal.low_gain = -1;
+		ieee80211_queue_delayed_work(hw, &dev->cal_work, 0);
+	}
 }
 EXPORT_SYMBOL_GPL(mt76x02_sw_scan_complete);
 
-- 
2.7.5