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mmc: Fix mmc bus width

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After setting the bus width, the extended CSD register is read. Some selected
fields are compared with previously read extended CSD register fields. In this
comparison the EXT_CSD_ERASE_GROUP_DEF field is compared. But this field is
previously written under certain circumstances. And then the comparison fails.

Only compare read-only fields. Therefore compare field EXT_CSD_HC_WP_GRP_SIZE
instead of field EXT_CSD_ERASE_GROUP_DEF.

Signed-off-by: Mario Schuknecht <mario.schuknecht@dresearch-fe.de>
Acked-by: Pantelis Antoniou <panto@antoniou-consulting.com>
This commit is contained in:
Mario Schuknecht 2014-09-30 17:04:42 +02:00 committed by Pantelis Antoniou
parent bcd06989b8
commit 786a27b7ec
1 changed files with 3 additions and 2 deletions
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5
drivers/mmc/mmc.c
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@ -1134,10 +1134,11 @@ static int mmc_startup(struct mmc *mmc)
mmc_set_bus_width(mmc, widths[idx]);
err = mmc_send_ext_csd(mmc, test_csd);
/* Only compare read only fields */
if (!err && ext_csd[EXT_CSD_PARTITIONING_SUPPORT] \
== test_csd[EXT_CSD_PARTITIONING_SUPPORT]
&& ext_csd[EXT_CSD_ERASE_GROUP_DEF] \
== test_csd[EXT_CSD_ERASE_GROUP_DEF] \
&& ext_csd[EXT_CSD_HC_WP_GRP_SIZE] \
== test_csd[EXT_CSD_HC_WP_GRP_SIZE] \
&& ext_csd[EXT_CSD_REV] \
== test_csd[EXT_CSD_REV]
&& ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] \