mmc: Allow host drivers to specify a max block size

Most controllers have an upper limit on the block size. Allow the host
drivers to specify this and make sure we avoid hitting this limit.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/mmc/mmci.c b/drivers/mmc/mmci.c
index ccfe6561be24..5d48e0081894 100644
--- a/drivers/mmc/mmci.c
+++ b/drivers/mmc/mmci.c
@@ -534,6 +534,11 @@ static int mmci_probe(struct amba_device *dev, void *id)
          */
         mmc->max_seg_size = mmc->max_sectors << 9;
 
+        /*
+         * Block size can be up to 2048 bytes, but must be a power of two.
+         */
+        mmc->max_blk_size = 2048;
+
         spin_lock_init(&host->lock);
 
         writel(0, host->base + MMCIMASK0);