linux-kernel - [PATCH 22/24] crypto: atmel-aes: change the DMA threshold

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Message-ID: <4b6dbda450970ac204c1b561278396d02b27dc7f.1450366831.git.cyrille.pitchen@atmel.com>
Date:	Thu, 17 Dec 2015 18:13:06 +0100
From:	Cyrille Pitchen <cyrille.pitchen@...el.com>
To:	<herbert@...dor.apana.org.au>, <davem@...emloft.net>,
	<nicolas.ferre@...el.com>
CC:	<linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Cyrille Pitchen <cyrille.pitchen@...el.com>
Subject: [PATCH 22/24] 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: Cyrille Pitchen <cyrille.pitchen@...el.com>
---
 drivers/crypto/atmel-aes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/atmel-aes.c b/drivers/crypto/atmel-aes.c
index a34919f6b7d7..ea645b4ee997 100644
--- a/drivers/crypto/atmel-aes.c
+++ b/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 {
-- 
1.8.2.2

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