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authorAlexander Aring <alex.aring@gmail.com>2015-06-16 11:07:43 +0200
committerMarcel Holtmann <marcel@holtmann.org>2015-06-16 18:55:11 +0200
commit74ed9d98456a7a85c9e041cd17350b8583659adf (patch)
treeb85903382f10844e2c68f2d3f8d90330c708cb9f
parentcbe6234689b07f5d1ecf2281573591ca4211a5cf (diff)
downloadop-kernel-dev-74ed9d98456a7a85c9e041cd17350b8583659adf.zip
op-kernel-dev-74ed9d98456a7a85c9e041cd17350b8583659adf.tar.gz
at86rf230: add recommended csma backoffs settings
This patch adds support for a new random csma backoffs settings when going into sleep state. This is recommended according at86rf2xx datasheets. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
-rw-r--r--drivers/net/ieee802154/at86rf230.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index b839bbd..7e30a45 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -945,10 +945,21 @@ static void
at86rf230_stop(struct ieee802154_hw *hw)
{
struct at86rf230_local *lp = hw->priv;
+ u8 csma_seed[2];
at86rf230_sync_state_change(hw->priv, STATE_FORCE_TRX_OFF);
disable_irq(lp->spi->irq);
+
+ /* It's recommended to set random new csma_seeds before sleep state.
+ * Makes only sense in the stop callback, not doing this inside of
+ * at86rf230_sleep, this is also used when we don't transmit afterwards
+ * when calling start callback again.
+ */
+ get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
+ at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
+ at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
+
at86rf230_sleep(lp);
}
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