crypto: atmel-aes - change the DMA threshold

Increase the DMA threshold to 256: PIO accesses offer better performances
than the DMA when processing small amounts of data.
Signed-off-by: NCyrille Pitchen <cyrille.pitchen@atmel.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/atmel-aes.c

@@ -76,7 +76,7 @@
 
 #define ATMEL_AES_QUEUE_LENGTH	50
 
-#define ATMEL_AES_DMA_THRESHOLD		16
+#define ATMEL_AES_DMA_THRESHOLD		256
 
 
 struct atmel_aes_caps {