diff options
| author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2011-07-04 22:13:26 +0000 |
|---|---|---|
| committer | Andy Fleming <afleming@freescale.com> | 2011-07-15 20:29:20 -0500 |
| commit | 639b7827d1caf28801775e222fe1d1dedece58f0 (patch) | |
| tree | a92087d67ebd6d0bb5b415bb1662dc29cb436276 | |
| parent | e75787d903e75095806f42f793328940656ea783 (diff) | |
mmc: fix the condition for MMC version 4
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>
Acked-by: Andy Fleming <afleming@freescale.com>
| -rw-r--r-- | 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 9a1ee3d3984..4e4e0fb0f3c 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -853,7 +853,7 @@ 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; @@ -1002,9 +1002,16 @@ 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; } /* |