crypto: omap-sham - correct dma burst size

Each cycle of SHA512 operates on 32 data words where as
SHA256 operates on 16 data words. This needs to be updated
while configuring DMA channels. Doing the same.
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/omap-sham.c

@@ -46,9 +46,6 @@
 
 #define MD5_DIGEST_SIZE			16
 
-#define DST_MAXBURST			16
-#define DMA_MIN				(DST_MAXBURST * sizeof(u32))
-
 #define SHA_REG_IDIGEST(dd, x)		((dd)->pdata->idigest_ofs + ((x)*0x04))
 #define SHA_REG_DIN(dd, x)		((dd)->pdata->din_ofs + ((x) * 0x04))
 #define SHA_REG_DIGCNT(dd)		((dd)->pdata->digcnt_ofs)
@@ -558,7 +555,7 @@ static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr,
 	struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
 	struct dma_async_tx_descriptor *tx;
 	struct dma_slave_config cfg;
-	int len32, ret;
+	int len32, ret, dma_min = get_block_size(ctx);
 
 	dev_dbg(dd->dev, "xmit_dma: digcnt: %d, length: %d, final: %d\n",
 						ctx->digcnt, length, final);
@@ -567,7 +564,7 @@ static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr,
 
 	cfg.dst_addr = dd->phys_base + SHA_REG_DIN(dd, 0);
 	cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-	cfg.dst_maxburst = DST_MAXBURST;
+	cfg.dst_maxburst = dma_min / DMA_SLAVE_BUSWIDTH_4_BYTES;
 
 	ret = dmaengine_slave_config(dd->dma_lch, &cfg);
 	if (ret) {
@@ -575,7 +572,7 @@ static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr,
 		return ret;
 	}
 
-	len32 = DIV_ROUND_UP(length, DMA_MIN) * DMA_MIN;
+	len32 = DIV_ROUND_UP(length, dma_min) * dma_min;
 
 	if (is_sg) {
 		/*
@@ -729,7 +726,7 @@ static int omap_sham_update_dma_start(struct omap_sham_dev *dd)
 	 * the dmaengine infrastructure will calculate that it needs
 	 * to transfer 0 frames which ultimately fails.
 	 */
-	if (ctx->total < (DST_MAXBURST * sizeof(u32)))
+	if (ctx->total < get_block_size(ctx))
 		return omap_sham_update_dma_slow(dd);
 
 	dev_dbg(dd->dev, "fast: digcnt: %d, bufcnt: %u, total: %u\n",