ENGR00234519 mmc: support eMMC v4.5 memory cards

Bypass eMMC version checking, so that eMMC v4.5 can work on current kernel as
eMMC v4.4 cards, no specific v4.5 feature supported. Only basic read/write
operations are supported, also ddr mode is supported.

Acked-by: Dong Aisheng <b29396@freescale.com>
Signed-off-by: Ryan QIAN <b32804@freescale.com>

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index f8ffabd187cf480a8d78c37b60d534f38f77e931..ce5e63c61b516ea2ee409ce5bb513faa51c3f9a8 100644 (file)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -259,7 +259,8 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
        }
 
        card->ext_csd.rev = ext_csd[EXT_CSD_REV];
-       if (card->ext_csd.rev > 5) {
+       /* workaround: support emmc 4.5 cards to work at emmc 4.4 mode */
+       if (card->ext_csd.rev > 6) {
                printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n",
                        mmc_hostname(card->host), card->ext_csd.rev);
                err = -EINVAL;