crypto: caam - adjust RNG timing to support more devices

Adjust RNG timing parameters to support more i.MX6 devices.

Signed-off-by: Victoria Milhoan <[email protected]>
Signed-off-by: Dan Douglass <[email protected]>
Signed-off-by: Vipul Kumar <[email protected]>
Signed-off-by: Horia Geantă <[email protected]>
Reviewed-by: Gaurav Jain <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

Author: Victoria Milhoan

drivers/crypto/caam/ctrl.c

@@ -389,8 +389,8 @@ static void kick_trng(struct device *dev, int ent_delay)
 	wr_reg32(&r4tst->rtsdctl, val);
 	/* min. freq. count, equal to 1/4 of the entropy sample length */
 	wr_reg32(&r4tst->rtfrqmin, ent_delay >> 2);
-	/* disable maximum frequency count */
-	wr_reg32(&r4tst->rtfrqmax, RTFRQMAX_DISABLE);
+	/* max. freq. count, equal to 16 times the entropy sample length */
+	wr_reg32(&r4tst->rtfrqmax, ent_delay << 4);
 	/* read the control register */
 	val = rd_reg32(&r4tst->rtmctl);
 start_rng: