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Message-ID: <lsq.1369712993.731352079@decadent.org.uk>
Date: Tue, 28 May 2013 04:49:53 +0100
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC: akpm@...ux-foundation.org, "Elad Yi" <elad.yi@...il.com>,
"Chris Ball" <cjb@...top.org>, "Philip Rakity" <prakity@...oo.com>
Subject: [03/94] mmc: core: Fix bit width test failing on old eMMC cards
3.2.46-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Philip Rakity <prakity@...oo.com>
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@...il.com>
Signed-off-by: Philip Rakity <prakity@...oo.com>
Signed-off-by: Chris Ball <cjb@...top.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
drivers/mmc/core/mmc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -363,13 +363,13 @@ static int mmc_read_ext_csd(struct mmc_c
ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
card->ext_csd.raw_trim_mult =
ext_csd[EXT_CSD_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) &&
(ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
hc_erase_grp_sz =
--
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