From: Sukumar Ghorai <s-gho...@ti.com>
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-gho...@ti.com>
Acked-by: Steve Sakoman <st...@sakoman.com>
---
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 80cd9bf..c543d83 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
--
1.7.0.4
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