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crypto: omap-sham - change the DMA threshold value to a define

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Currently the threshold value was hardcoded in the driver. Having a define
for it makes it easier to configure.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tero Kristo 2016-09-19 18:22:16 +03:00 • committed by Herbert Xu
parent f19de1bc67
commit 2c5bd1ef15
1 changed files with 5 additions and 3 deletions
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8
drivers/crypto/omap-sham.c
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@ -137,6 +137,7 @@
#define OMAP_ALIGNED __attribute__((aligned(sizeof(u32)))) #define OMAP_ALIGNED __attribute__((aligned(sizeof(u32))))
#define BUFLEN PAGE_SIZE #define BUFLEN PAGE_SIZE
#define OMAP_SHA_DMA_THRESHOLD 256
struct omap_sham_dev; struct omap_sham_dev;
@ -1435,10 +1436,11 @@ static int omap_sham_final(struct ahash_request *req)
/* /*
* OMAP HW accel works only with buffers >= 9. * OMAP HW accel works only with buffers >= 9.
* HMAC is always >= 9 because ipad == block size. * HMAC is always >= 9 because ipad == block size.
* If buffersize is less than 240, we use fallback SW encoding, * If buffersize is less than DMA_THRESHOLD, we use fallback
* as using DMA + HW in this case doesn't provide any benefit. * SW encoding, as using DMA + HW in this case doesn't provide
* any benefit.
*/ */
if (!ctx->digcnt && ctx->bufcnt < 240) if (!ctx->digcnt && ctx->bufcnt < OMAP_SHA_DMA_THRESHOLD)
return omap_sham_final_shash(req); return omap_sham_final_shash(req);
else if (ctx->bufcnt) else if (ctx->bufcnt)
return omap_sham_enqueue(req, OP_FINAL); return omap_sham_enqueue(req, OP_FINAL);