Mirrors/u-boot
2
0
Fork 0
mirror of https://github.com/AsahiLinux/u-boot synced 2024-11-25 14:10:43 +00:00
Code Issues Projects Releases Packages Wiki Activity

mmc: Fix mmc bus width

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

5
drivers/mmc/mmc.c
View file

@ -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] \