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ieee802154: ensure that first RF212 state comes from TRX_OFF 

A documented erratum of the RF212 chip describes that some versions of
RF212 may not be properly reset by the standard reset procedure. The
described workaround seems to not fully work either; my RF212 chips will
not correctly receive any frames unless they are taken from RX mode to
TRX_OFF and back to RX mode, effectively forcing a up-down-up-cycle.
Going to TRX_OFF and to RX without intermediate state changes at least
once fixes this.

The same transition is allowed for RF230, so simply do it all the time.

Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Phoebe Buckheister 2014-02-17 11:34:13 +01:00 committed by David S. Miller
parent 6ca001978d
commit 7dcbd22a97
1 changed files with 3 additions and 22 deletions
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25
drivers/net/ieee802154/at86rf230.c
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@ -926,18 +926,9 @@ static int at86rf230_hw_init(struct at86rf230_local *lp)
if (rc) if (rc)
return rc; return rc;
dev_info(&lp->spi->dev, "Status: %02x\n", status); rc = at86rf230_write_subreg(lp, SR_TRX_CMD, STATE_FORCE_TRX_OFF);
if (status == STATE_P_ON) { if (rc)
rc = at86rf230_write_subreg(lp, SR_TRX_CMD, return rc;
STATE_FORCE_TRX_OFF);
if (rc)
return rc;
msleep(1);
rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &status);
if (rc)
return rc;
dev_info(&lp->spi->dev, "Status: %02x\n", status);
}
/* configure irq polarity, defaults to high active */ /* configure irq polarity, defaults to high active */
if (pdata->irq_type & (IRQF_TRIGGER_FALLING | IRQF_TRIGGER_LOW)) if (pdata->irq_type & (IRQF_TRIGGER_FALLING | IRQF_TRIGGER_LOW))
@ -965,16 +956,6 @@ static int at86rf230_hw_init(struct at86rf230_local *lp)
/* Wait the next SLEEP cycle */ /* Wait the next SLEEP cycle */
msleep(100); msleep(100);
rc = at86rf230_write_subreg(lp, SR_TRX_CMD, STATE_TX_ON);
if (rc)
return rc;
msleep(1);
rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &status);
if (rc)
return rc;
dev_info(&lp->spi->dev, "Status: %02x\n", status);
rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &status); rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &status);
if (rc) if (rc)
return rc; return rc;