diff mbox

[3/6] crypto: img-hash - Reconfigure DMA Burst length

Message ID 1468229616-3888-4-git-send-email-will.thomas@imgtec.com (mailing list archive)
State Changes Requested
Delegated to: Herbert Xu
Headers show

Commit Message

Will Thomas July 11, 2016, 9:33 a.m. UTC 
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>
---
 drivers/crypto/img-hash.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/drivers/crypto/img-hash.c b/drivers/crypto/img-hash.c
index 7fa6aa4..fbed47a 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);