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MMC: Fix for capacity calculation on eMMC

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The current mmc driver returns erroneous capacity information for
  eMMC.  The capacity of eMMC devices is available only in the ext-CSD
  register.  This patch add code to read the ext-CDSD register and
  correctly calculate eMMC capacity.

Signed-off-by: Sukumar Ghorai <s-ghorai@ti.com>
Acked-by: Steve Sakoman <steve@sakoman.com>
This commit is contained in:
Sukumar Ghorai 2010-09-20 18:29:29 +05:30 committed by Wolfgang Denk
parent 7b7903ec6a
commit d23e2c09a7
1 changed files with 11 additions and 0 deletions
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11
drivers/mmc/mmc.c
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@ -627,6 +627,7 @@ int mmc_startup(struct mmc *mmc)
uint mult, freq;
u64 cmult, csize;
struct mmc_cmd cmd;
char ext_csd[512];
/* Put the Card in Identify Mode */
cmd.cmdidx = MMC_CMD_ALL_SEND_CID;
@ -742,6 +743,16 @@ int mmc_startup(struct mmc *mmc)
if (err)
return err;
if (!IS_SD(mmc) && (mmc->version >= MMC_VERSION_4)) {
/* 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;
}
}
if (IS_SD(mmc))
err = sd_change_freq(mmc);
else