2 files changed, 10 insertions, 4 deletions

diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 8e480140cd28..95fe0fdac484 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -326,6 +326,9 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
         DBG("tsac %d ms nsac %d clk\n",
                 data->timeout_ns / 1000000, data->timeout_clks);
 
+        /* Sanity checks */
+        BUG_ON(data->blksz * data->blocks > 524288);
+
         /* timeout in us */
         target_timeout = data->timeout_ns / 1000 +
                 data->timeout_clks / host->clock;
@@ -375,7 +378,9 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
                 host->remain = host->cur_sg->length;
         }
 
-        writew(data->blksz, host->ioaddr + SDHCI_BLOCK_SIZE);
+        /* We do not handle DMA boundaries, so set it to max (512 KiB) */
+        writew(SDHCI_MAKE_BLKSZ(7, data->blksz),
+                host->ioaddr + SDHCI_BLOCK_SIZE);
         writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
 }
 
@@ -1188,10 +1193,10 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
         mmc->max_phys_segs = 16;
 
         /*
-         * Maximum number of sectors in one transfer. Limited by sector
-         * count register.
+         * Maximum number of sectors in one transfer. Limited by DMA boundary
+         * size (512KiB), which means (512 KiB/512=) 1024 entries.
          */
-        mmc->max_sectors = 0x3FFF;
+        mmc->max_sectors = 1024;
 
         /*
          * Maximum segment size. Could be one segment with the maximum number
diff --git a/drivers/mmc/sdhci.h b/drivers/mmc/sdhci.h
index f8df28f8d6dd..8ed2a8973db6 100644
--- a/drivers/mmc/sdhci.h
+++ b/drivers/mmc/sdhci.h
@@ -23,6 +23,7 @@
 #define SDHCI_DMA_ADDRESS       0x00
 
 #define SDHCI_BLOCK_SIZE        0x04
+#define  SDHCI_MAKE_BLKSZ(dma, blksz) (((dma & 0x7) << 12) | (blksz & 0xFFF))
 
 #define SDHCI_BLOCK_COUNT       0x06