diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index 0c487537a295d8769e67e042a0dd8b9c9ad7b76a..c5ba13fae39920e656de9737412804e2f5155a77 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -105,6 +105,8 @@
 		TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
 #define TMIO_MASK_IRQ     (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)
 
+#define TMIO_MAX_BLK_SIZE 512
+
 struct tmio_mmc_data;
 struct tmio_mmc_host;
 
diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index 3b77e038f85986ea09e10d669276b3faffca997c..130b91cb0f8a3fd18c85a2a2c7b43a3e0fab4d05 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -1186,7 +1186,7 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host)
 	mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities;
 	mmc->caps2 |= pdata->capabilities2;
 	mmc->max_segs = pdata->max_segs ? : 32;
-	mmc->max_blk_size = 512;
+	mmc->max_blk_size = TMIO_MAX_BLK_SIZE;
 	mmc->max_blk_count = pdata->max_blk_count ? :
 		(PAGE_SIZE / mmc->max_blk_size) * mmc->max_segs;
 	mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;