diff options
| author | Sukumar Ghorai <s-ghorai@ti.com> | 2010-09-20 18:29:29 +0530 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2010-10-17 20:14:06 +0200 |
| commit | d23e2c09a7900ec4c208e602b608ae2399e6d536 (patch) | |
| tree | eebe5846ec1bcd07094e7ab332aab75f7a6d7730 /drivers/mmc | |
| parent | 7b7903ec6a1c693c98e9dea512b91eb59cfd0cf6 (diff) | |
MMC: Fix for capacity calculation on eMMC
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>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/mmc.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 80cd9bff9bb..c543d837dc7 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -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 |