[MMC] sdhci: Test for invalid block size

The controller has an upper limit on the block size. Make sure we do not
cross it.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/mmc/sdhci.h b/drivers/mmc/sdhci.h
index 8ed2a8973db6..b1aa3acf0906 100644
--- a/drivers/mmc/sdhci.h
+++ b/drivers/mmc/sdhci.h
@@ -131,6 +131,8 @@
 #define  SDHCI_TIMEOUT_CLK_UNIT 0x00000080
 #define  SDHCI_CLOCK_BASE_MASK  0x00003F00
 #define  SDHCI_CLOCK_BASE_SHIFT 8
+#define  SDHCI_MAX_BLOCK_MASK   0x00030000
+#define  SDHCI_MAX_BLOCK_SHIFT  16
 #define  SDHCI_CAN_DO_DMA       0x00400000
 #define  SDHCI_CAN_VDD_330      0x01000000
 #define  SDHCI_CAN_VDD_300      0x02000000
@@ -161,6 +163,7 @@ struct sdhci_host {
 
         unsigned int            max_clk;        /* Max possible freq (MHz) */
         unsigned int            timeout_clk;    /* Timeout freq (KHz) */
+        unsigned int            max_block;      /* Max block size (bytes) */
 
         unsigned int            clock;          /* Current clock (MHz) */
         unsigned short          power;          /* Current voltage */