at86rf230: various fixes

Hi,

I currently working on a big cleanup for the at86rf230 and I detect some bugs in the current implementation. I will send patch stacks if net-next is open again.

It's funny to find the forgotten shift and mask in the __at86rf230_read_subreg function but it only makes trouble if csma is activated that's why it still works before for me.

- Alex

changes since v2:
- correct a few text corrections (Werner helped me there, thanks!)
- Add Reviewed by Werner Almesberger

Alexander Aring (2):
at86rf230: remove check if AVDD settled
at86rf230: fix __at86rf230_read_subreg function

 drivers/net/ieee802154/at86rf230.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

1.9.2

The AVDD regulator is only enabled when the RF section is active TX_ON (PLL_ON) state. Since commit 7dcbd22a97eb0689e6c583ad630ae0e7341e34c1 ("ieee802154: ensure that first RF212 state comes from TRX_OFF"). We are in TRX_OFF state at the time at86rf230_hw_init is run.

Note that this test would only fail in case of a severe hardware malfunction (faulty/shorted power supply, etc.) so it wasn't all that useful in the first place.

---
 drivers/net/ieee802154/at86rf230.c | 8 --------
 1 file changed, 8 deletions(-)

index 430bb0d..e102eef 100644
@@ -1025,14 +1025,6 @@ static int at86rf230_hw_init(struct at86rf230_local *lp)
 		return -EINVAL;
 	}
 
-	rc = at86rf230_read_subreg(lp, SR_AVDD_OK, &status);
-	if (rc)
-		return rc;
-	if (!status) {
-		dev_err(&lp->spi->dev, "AVDD error\n");
-		return -EINVAL;
-	}
-
 	return 0;
 }
 

1.9.2


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The __at86rf230_read_subreg function don't mask and shift register contents which it should do. This patch adds the necessary masks and shift operations in this function.

Since we have csma support this can make some trouble on state changes. Since CSMA support turned on some bits in the TRX_STATUS register that used to be zero, not masking broke checking of the TRX_STATUS field after commanding a state change.

---
 drivers/net/ieee802154/at86rf230.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index e102eef..e36f194 100644
@@ -365,7 +365,7 @@ __at86rf230_read_subreg(struct at86rf230_local *lp,
 	dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
 
 	if (status == 0)
-		*data = buf[1];
+		*data = (buf[1] & mask) >> shift;
 
 	return status;
 }

1.9.2


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From: Alexander Aring <[email protected]>
Date: Mon, 14 Apr 2014 18:48:00 +0200

Series applied.