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crypto: img-hash - Reconfigure DMA Burst length

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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>
This commit is contained in:
Will Thomas 2016-08-05 14:00:16 +01:00 committed by Herbert Xu
parent dd4f677b0c
commit 302a1bee8f
1 changed files with 2 additions and 1 deletions
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3
drivers/crypto/img-hash.c
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@ -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);