diff options
| author | Sujith Reddy Thumma <sthumma@codeaurora.org> | 2010-12-20 16:27:20 +0530 |
|---|---|---|
| committer | Subhash Jadavani <subhashj@codeaurora.org> | 2016-05-31 15:20:53 -0700 |
| commit | 267e3b25f4327741a6790bc957b99afd1e4c9e4b (patch) | |
| tree | edba17fc3e25d4af323ca8a081cd84e1cc71ac07 /include/linux/mmc | |
| parent | 710b297f4c0ad689c544cf5f20c50d97349899c5 (diff) | |
mmc: core: Determine correct access mode for eMMC cards by reading OCR
MMC core reads SEC_COUNT information from EXT_CSD register and assumes
that the card supports sector access mode. Some eMMC cards (<=2GB) do not
support this mode even though they have SEC_COUNT value defined, causing
failure while populating extended partitions. Sector/Byte access mode
information is stored in OCR register. Hence, read OCR bit 30 and then
confirm it with SEC_COUNT value to know whether the card supports sector
access mode or byte access mode.
Change-Id: Ifdfff35309e8667cd2c2ac2761b9a708d5b785d3
Signed-off-by: Sujith Reddy Thumma <sthumma@codeaurora.org>
Diffstat (limited to 'include/linux/mmc')
| -rw-r--r-- | include/linux/mmc/mmc.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h index 5b085532fc2d..6f5b437311c2 100644 --- a/include/linux/mmc/mmc.h +++ b/include/linux/mmc/mmc.h @@ -165,6 +165,7 @@ struct _mmc_csd { * OCR bits are mostly in host.h */ #define MMC_CARD_BUSY 0x80000000 /* Card Power up status bit */ +#define MMC_CARD_SECTOR_ADDR 0x40000000 /* Card supports sectors */ /* * Card Command Classes (CCC) |