mmc: use the generic error number

Use the generic error number instead of specific error number.
If use the generic error number, it can debug more easier.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/drivers/mmc/davinci_mmc.c b/drivers/mmc/davinci_mmc.c
index aae00e9..b495c75 100644
--- a/drivers/mmc/davinci_mmc.c
+++ b/drivers/mmc/davinci_mmc.c
@@ -9,6 +9,7 @@
 #include <config.h>
 #include <common.h>
 #include <command.h>
+#include <errno.h>
 #include <mmc.h>
 #include <part.h>
 #include <malloc.h>
@@ -66,7 +67,7 @@
 		udelay(100);
 
 	if (wdog == 0)
-		return COMM_ERR;
+		return -ECOMM;
 
 	return 0;
 }
@@ -80,7 +81,7 @@
 		udelay(10);
 
 	if (wdog == 0)
-		return COMM_ERR;
+		return -ECOMM;
 
 	return 0;
 }
@@ -99,7 +100,7 @@
 			return 0;
 		} else if (mmcstatus & st_error) {
 			if (mmcstatus & MMCST0_TOUTRS)
-				return TIMEOUT;
+				return -ETIMEDOUT;
 			printf("[ ST0 ERROR %x]\n", mmcstatus);
 			/*
 			 * Ignore CRC errors as some MMC cards fail to
@@ -107,7 +108,7 @@
 			 */
 			if (mmcstatus & MMCST0_CRCRS)
 				return 0;
-			return COMM_ERR;
+			return -ECOMM;
 		}
 		udelay(10);
 
@@ -116,7 +117,7 @@
 
 	printf("Status %x Timeout ST0:%x ST1:%x\n", st_ready, mmcstatus,
 			get_val(&regs->mmcst1));
-	return COMM_ERR;
+	return -ECOMM;
 }
 
 /*