[BACKPORT FROM 4.1] mmc: dw_mmc: init desc in dw_mci_idmac_init

Set 0 to des1 in 32bit case.
Otherwise the random value of des1 will be used in
dw_mci_translate_sglist: IDMAC_SET_BUFFER1_SIZE(desc, length)

Signed-off-by: Fei Wang <[email protected]>
Signed-off-by: Zhangfei Gao <[email protected]>
Signed-off-by: Jaehoon Chung <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>
Signed-off-by: Alexey Brodkin <[email protected]>

Author: zhangfeigao

drivers/mmc/host/dw_mmc.c

@@ -473,8 +473,10 @@ static int dw_mci_idmac_init(struct dw_mci *host)
 	host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
 
 	/* Forward link the descriptor list */
-	for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++)
+	for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++) {
 		p->des3 = host->sg_dma + (sizeof(struct idmac_desc) * (i + 1));
+		p->des1 = 0;
+	}
 
 	/* Set the last descriptor as the end-of-ring descriptor */
 	p->des3 = host->sg_dma;