From: Will Thomas <will.thomas@imgtec.com>
Date: Fri, 5 Aug 2016 13:00:16 +0000 (+0100)
Subject: crypto: img-hash - Reconfigure DMA Burst length
X-Git-Tag: v4.9-rc1~53^2~119
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=302a1bee8fd71b01bcf4ca8395c115a60cef52bf;p=karo-tx-linux.git

crypto: img-hash - Reconfigure DMA Burst length

Burst length of 16 drives the hash accelerator out of spec
and causes stability issues in some cases. Reduce this to
stop data being lost.

Signed-off-by: Will Thomas <will.thomas@imgtec.com>
Reviewed-by: James Hartley <james.hartley@imgtec.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/drivers/crypto/img-hash.c b/drivers/crypto/img-hash.c
index de2b86efbfe4..f8abbe3bc51c 100644
--- a/drivers/crypto/img-hash.c
+++ b/drivers/crypto/img-hash.c
@@ -71,6 +71,7 @@
 #define DRIVER_FLAGS_MD5		BIT(21)
 
 #define IMG_HASH_QUEUE_LENGTH		20
+#define IMG_HASH_DMA_BURST		4
 #define IMG_HASH_DMA_THRESHOLD		64
 
 #ifdef __LITTLE_ENDIAN
@@ -342,7 +343,7 @@ static int img_hash_dma_init(struct img_hash_dev *hdev)
 	dma_conf.direction = DMA_MEM_TO_DEV;
 	dma_conf.dst_addr = hdev->bus_addr;
 	dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-	dma_conf.dst_maxburst = 16;
+	dma_conf.dst_maxburst = IMG_HASH_DMA_BURST;
 	dma_conf.device_fc = false;
 
 	err = dmaengine_slave_config(hdev->dma_lch,  &dma_conf);