MMC driver may wrongly regconize some 2GB eMMC as high capacity card.
This patch is based on the patch picked from community.
fc8a0985c2846292312556cba10b8a4182f55967 From: Hanumath Prasad hanumath.prasad@stericsson.com Date: Tue, 10 Aug 2010 18:01:45 -0700 Subject: [PATCH] mmc: only set blockaddressed for > 2GiB cards
A non-zero value of SEC_COUNT does not indicate that the card is sector addressed. According to the MMC specification, cards with a densitygreater than 2GiB are sector addressed.
Signed-off-by: Terry Lv r65388@freescale.com --- drivers/mmc/mmc.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 6805b33..6f97911 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -399,7 +399,9 @@ int mmc_change_freq(struct mmc *mmc) if (err) return err;
- if (ext_csd[212] || ext_csd[213] || ext_csd[214] || ext_csd[215]) + /* Cards with density > 2GiB are sector addressed */ + if ((ext_csd[212] || ext_csd[213] || ext_csd[214] || ext_csd[215]) && + (mmc->capacity > (2u * 1024 * 1024 * 1024) / 512)) mmc->high_capacity = 1;
cardtype = ext_csd[196] & 0xf;