[PATCH 005/115] mmc: core: Fix bit width test failing on old eMMC cards

From: Luis Henriques
Date: Mon May 20 2013 - 07:22:58 EST -stable review patch. If anyone has any objections, please let me know.


From: Philip Rakity <prakity@xxxxxxxxx>

commit 836dc2fe89c968c10cada87e0dfae6626f8f9da3 upstream.

PARTITION_SUPPORT needs to be set before doing the compare on version
number so the bit width test does not get invalid data. Before this
patch, a Sandisk iNAND eMMC card would detect 1-bit width although
the hardware supports 4-bit.

Only affects old emmc devices - pre 4.4 devices.

Reported-by: Elad Yi <elad.yi@xxxxxxxxx>
Signed-off-by: Philip Rakity <prakity@xxxxxxxxx>
Signed-off-by: Chris Ball <cjb@xxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
drivers/mmc/core/mmc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 4f4489a..bb9e81d 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -368,13 +368,13 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
card->ext_csd.raw_trim_mult =
+ card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
if (card->ext_csd.rev >= 4) {
* Enhanced area feature support -- check whether the eMMC
* card has the Enhanced area enabled. If so, export enhanced
* area offset and size to user by adding sysfs interface.
- card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
hc_erase_grp_sz =

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