mmc: dw_mmc: clear IDSTS register when initialize IDMAC

If pending interrupt for IDMAC exists when initialize IDMAC, it will
call interrupt handler unnecessarily.
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/dw_mmc.c

@@ -51,6 +51,11 @@
 #define DW_MCI_DMA_THRESHOLD	16
 
 #ifdef CONFIG_MMC_DW_IDMAC
+#define IDMAC_INT_CLR		(SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \
+				 SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \
+				 SDMMC_IDMAC_INT_FBE | SDMMC_IDMAC_INT_RI | \
+				 SDMMC_IDMAC_INT_TI)
+
 struct idmac_desc {
 	u32		des0;	/* Control Descriptor */
 #define IDMAC_DES0_DIC	BIT(1)
@@ -433,6 +438,7 @@ static int dw_mci_idmac_init(struct dw_mci *host)
 	mci_writel(host, BMOD, SDMMC_IDMAC_SWRESET);
 
 	/* Mask out interrupts - get Tx & Rx complete only */
+	mci_writel(host, IDSTS, IDMAC_INT_CLR);
 	mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | SDMMC_IDMAC_INT_RI |
 		   SDMMC_IDMAC_INT_TI);