candev: allow SJW user setting for bittiming calculation

[socketcan-devel.git] / kernel / 2.6 / drivers / net / can / dev.c

diff --git a/kernel/2.6/drivers/net/can/dev.c b/kernel/2.6/drivers/net/can/dev.c
index 0b68c160b4a58747e005a3ac6a5b9445e37985bc..59e779be38ee0c9c589b920befe67180145231c7 100644 (file)
--- a/kernel/2.6/drivers/net/can/dev.c
+++ b/kernel/2.6/drivers/net/can/dev.c
@@ -160,7 +160,19 @@ static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt)
        bt->prop_seg = tseg1 / 2;
        bt->phase_seg1 = tseg1 - bt->prop_seg;
        bt->phase_seg2 = tseg2;
-       bt->sjw = 1;
+
+       /* check for sjw user settings */
+       if (!bt->sjw || !btc->sjw_max)
+               bt->sjw = 1;
+       else {
+               /* bt->sjw is at least 1 -> sanitize upper bound to sjw_max */
+               if (bt->sjw > btc->sjw_max)
+                       bt->sjw = btc->sjw_max;
+               /* bt->sjw must not be higher than tseg2 */
+               if (tseg2 < bt->sjw)
+                       bt->sjw = tseg2;
+       }
+
        bt->brp = best_brp;
 #ifndef CONFIG_CAN_DEV_SYSFS
        /* real bit-rate */