diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index c9f251713611..4feb8971003e 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -782,7 +782,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size;
 
 	/* data bounce buffer */
-	host->bounce_buf_size = SZ_512K;
+	host->bounce_buf_size = mmc->max_req_size;
 	host->bounce_buf =
 		dma_alloc_coherent(host->dev, host->bounce_buf_size,
 				   &host->bounce_dma_addr, GFP_KERNEL);