mtd: nand: enable ECC pipelining

When the NAND controller operates in DMA mode it can pipeline ECC
operations which improves the throughput.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c
index cad20fb..fe3730a 100644
--- a/drivers/mtd/nand/sunxi_nand.c
+++ b/drivers/mtd/nand/sunxi_nand.c
@@ -742,7 +742,8 @@
 	ecc_ctl = readl(nfc->regs + NFC_REG_ECC_CTL);
 	ecc_ctl &= ~(NFC_ECC_MODE_MSK | NFC_ECC_PIPELINE |
 		     NFC_ECC_BLOCK_SIZE_MSK);
-	ecc_ctl |= NFC_ECC_EN | NFC_ECC_MODE(data->mode) | NFC_ECC_EXCEPTION;
+	ecc_ctl |= NFC_ECC_EN | NFC_ECC_MODE(data->mode) | NFC_ECC_EXCEPTION |
+		   NFC_ECC_PIPELINE;
 
 	writel(ecc_ctl, nfc->regs + NFC_REG_ECC_CTL);
 }