Fix the problem that if we use the chip of MMC version 4 and the capacity is smaller than 2GB or equal, the mmc->capacity is invalid. According to the JEDEC Standard, the value of ext_csd's capacity is valid if the value is more than 2GB.
Signed-off-by: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com --- drivers/mmc/mmc.c | 15 +++++++++++---- 1 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 21aedba..79a162b 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -771,7 +771,7 @@ int mmc_startup(struct mmc *mmc) { int err; uint mult, freq; - u64 cmult, csize; + u64 cmult, csize, capacity; struct mmc_cmd cmd; char ext_csd[512]; int timeout = 1000; @@ -916,9 +916,16 @@ int mmc_startup(struct mmc *mmc) /* check ext_csd version and capacity */ err = mmc_send_ext_csd(mmc, ext_csd); if (!err & (ext_csd[192] >= 2)) { - mmc->capacity = ext_csd[212] << 0 | ext_csd[213] << 8 | - ext_csd[214] << 16 | ext_csd[215] << 24; - mmc->capacity *= 512; + /* + * According to the JEDEC Standard, the value of + * ext_csd's capacity is valid if the value is more + * than 2GB + */ + capacity = ext_csd[212] << 0 | ext_csd[213] << 8 | + ext_csd[214] << 16 | ext_csd[215] << 24; + capacity *= 512; + if (capacity > 2 * 1024 * 1024 * 1024) + mmc->capacity = capacity; }
/* store the partition info of emmc */