at86rf230: correct aret lifs and sifs handling

This patch adds lifs/sifs handling only if max_frame_retries is above
zero. The at86rf2xx datasheets says nothing about phy lifs/sifs
handling. I asked the atmel support and they said lifs/sifs is done
by phy when max_frame_retries is above zero.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index 44d2f1de31e0..2a25324d3a64 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -89,6 +89,7 @@ struct at86rf230_local {
         struct at86rf230_state_change irq;
 
         bool tx_aret;
+        s8 max_frame_retries;
         bool is_tx;
         /* spinlock for is_tx protection */
         spinlock_t lock;
@@ -1001,6 +1002,9 @@ at86rf230_xmit(struct ieee802154_dev *dev, struct sk_buff *skb)
                 return -ETIMEDOUT;
         }
 
+        if (lp->max_frame_retries > 0)
+                return 0;
+
         /* Interfame spacing time, which is phy depend.
          * TODO
          * Move this handling in MAC 802.15.4 layer.
@@ -1230,6 +1234,7 @@ at86rf230_set_frame_retries(struct ieee802154_dev *dev, s8 retries)
                 return -EINVAL;
 
         lp->tx_aret = retries >= 0;
+        lp->max_frame_retries = retries;
 
         if (retries >= 0)
                 rc = at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);