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Restore radio power mode and calibration on resume #216

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Restore radio power mode and calibration on resume #216

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23 changes: 23 additions & 0 deletions transport/mt76.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1075,10 +1075,33 @@ int xone_mt76_resume_radio(struct xone_mt76 *mt)
if (err)
return err;

/*
* The RF front end does not survive a system suspend: the MCU leaves
* MT_RADIO_ON and the RXDCOC/RC/temperature calibrations applied by
* init_radio() are lost. The MAC layer does survive, so the dongle
* still beacons and a controller still associates - but an
* uncalibrated RF path cannot sustain the link, so it collapses a few
* seconds later and the controller reassociates every ~10s forever.
*
* Restore the radio power mode and redo the calibration, mirroring
* init_radio(). calibrate_radio() leaves MT_MAC_SYS_CTRL with RX and
* TX enabled; it is re-applied below after the channel switch.
*/
err = xone_mt76_set_power_mode(mt, MT_RADIO_ON);
if (err)
return err;

err = xone_mt76_calibrate_radio(mt);
if (err)
return err;

err = xone_mt76_switch_channel(mt, mt->channel);
if (err)
return err;

/* mandatory delay after channel change */
msleep(1000);

err = xone_mt76_set_pairing(mt, false);
if (err)
return err;
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