Add defines for ext_csd field MAX_ENH_SIZE_MULT

Signed-off-by: Oliver Metz <oliver@freetz.org>
Reviewed-by: Ben Gardiner <ben.l.gardiner@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

mmc.h

@@ -52,6 +52,9 @@
 #define EXT_CSD_BKOPS_EN		163	/* R/W */
 #define EXT_CSD_RST_N_FUNCTION		162	/* R/W */
 #define EXT_CSD_PARTITIONING_SUPPORT	160	/* RO */
+#define EXT_CSD_MAX_ENH_SIZE_MULT_2	159
+#define EXT_CSD_MAX_ENH_SIZE_MULT_1	158
+#define EXT_CSD_MAX_ENH_SIZE_MULT_0	157
 #define EXT_CSD_PARTITIONS_ATTRIBUTE	156	/* R/W */
 #define EXT_CSD_PARTITION_SETTING_COMPLETED	155	/* R/W */
 #define EXT_CSD_ENH_SIZE_MULT_2		142

mmc_cmds.c

@@ -1024,8 +1024,10 @@ int do_read_extcsd(int nargs, char **argv)
 		else
 			printf(" Device cannot have enhanced tech.\n");
 
-		reg = (ext_csd[159] << 16) | (ext_csd[158] << 8) |
-			ext_csd[157];
+		reg = (ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT_2] << 16) |
+			(ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT_1] << 8) |
+			ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT_0];
+
 		printf("Max Enhanced Area Size [MAX_ENH_SIZE_MULT]: 0x%06x\n",
 			   reg);
 		unsigned int wp_sz = get_hc_wp_grp_size(ext_csd);