From: Kyungmin Park <kmpark@xxxxxxxxxxxxx>
The eMMC spec 4.4 and 4.3 + additional feature chips has CSD structure
version 3 and version 3 have to check the CSD_STRUCTURE byte in the
EXT_CSD register.
Also fix EXT_CSD revision message.
[akpm@xxxxxxxxxxxxxxxxxxxx: fix comment, per Chris Ball]
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Chris Ball <cjb@xxxxxxxxxx>
Cc: <linux-mmc@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/mmc.c | 26 +++++++++++++++++++-------
include/linux/mmc/card.h | 1 +
include/linux/mmc/mmc.h | 1 +
3 files changed, 21 insertions(+), 7 deletions(-)
diff -puN drivers/mmc/core/mmc.c~mmc-recognize-csd-structure drivers/mmc/core/mmc.c
--- a/drivers/mmc/core/mmc.c~mmc-recognize-csd-structure
+++ a/drivers/mmc/core/mmc.c
@@ -114,17 +114,18 @@ static int mmc_decode_cid(struct mmc_car
static int mmc_decode_csd(struct mmc_card *card)
{
struct mmc_csd *csd = &card->csd;
- unsigned int e, m, csd_struct;
+ unsigned int e, m;
u32 *resp = card->raw_csd;
/*
* We only understand CSD structure v1.1 and v1.2.
* v1.2 has extra information in bits 15, 11 and 10.
+ * We also support eMMC v4.4 & v4.41.
*/
- csd_struct = UNSTUFF_BITS(resp, 126, 2);
- if (csd_struct != 1 && csd_struct != 2) {
+ csd->structure = UNSTUFF_BITS(resp, 126, 2);
+ if (csd->structure == 0) {
printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
- mmc_hostname(card->host), csd_struct);
+ mmc_hostname(card->host), csd->structure);
return -EINVAL;
}
@@ -207,11 +208,22 @@ static int mmc_read_ext_csd(struct mmc_c
goto out;
}
+ /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
+ if (card->csd.structure == 3) {
+ int ext_csd_struct = ext_csd[EXT_CSD_STRUCTURE];
+ if (ext_csd_struct > 2) {
+ printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
+ "version %d\n", mmc_hostname(card->host),
+ ext_csd_struct);
+ err = -EINVAL;
+ goto out;
+ }
+ }
+
card->ext_csd.rev = ext_csd[EXT_CSD_REV];
if (card->ext_csd.rev > 5) {
- printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
- "version %d\n", mmc_hostname(card->host),
- card->ext_csd.rev);
+ printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n",
+ mmc_hostname(card->host), card->ext_csd.rev);
err = -EINVAL;
goto out;
}
diff -puN include/linux/mmc/card.h~mmc-recognize-csd-structure include/linux/mmc/card.h
--- a/include/linux/mmc/card.h~mmc-recognize-csd-structure
+++ a/include/linux/mmc/card.h
@@ -24,6 +24,7 @@ struct mmc_cid {
};
struct mmc_csd {
+ unsigned char structure;
unsigned char mmca_vsn;
unsigned short cmdclass;
unsigned short tacc_clks;
diff -puN include/linux/mmc/mmc.h~mmc-recognize-csd-structure include/linux/mmc/mmc.h
--- a/include/linux/mmc/mmc.h~mmc-recognize-csd-structure
+++ a/include/linux/mmc/mmc.h
@@ -254,6 +254,7 @@ struct _mmc_csd {
#define EXT_CSD_BUS_WIDTH 183 /* R/W */
#define EXT_CSD_HS_TIMING 185 /* R/W */
#define EXT_CSD_CARD_TYPE 196 /* RO */
+#define EXT_CSD_STRUCTURE 194 /* RO */
#define EXT_CSD_REV 192 /* RO */
#define EXT_CSD_SEC_CNT 212 /* RO, 4 bytes */
#define EXT_CSD_S_A_TIMEOUT 217
_
--
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