leandrof/u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

mmc:fix: Set mmc width according to MMC host capabilities

Browse Source 
This patch sets the MMC width according to the MMC host capabilities.
It turned out, that there are some targets (e.g. GONI), which are able
to read data from SPI only at 4 bit mode.
This patch restricts the width number according to the MMC host.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Andy Fleming <afleming@gmail.com>
This commit is contained in:
Łukasz Majewski 2012-03-12 22:07:18 +00:00 committed by Andy Fleming
parent 0a6deb3251
commit 6272203641
2 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/mmc/mmc.c
View File

@ -1199,7 +1199,9 @@ int mmc_startup(struct mmc *mmc)
else
mmc_set_clock(mmc, 25000000);
} else {
for (width = EXT_CSD_BUS_WIDTH_8; width >= 0; width--) {
width = ((mmc->host_caps & MMC_MODE_MASK_WIDTH_BITS) >>
MMC_MODE_WIDTH_BITS_SHIFT);
for (; width >= 0; width--) {
/* Set the card to use 4 bit*/
err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BUS_WIDTH, width);

3
include/mmc.h
View File

@ -47,6 +47,9 @@
#define MMC_MODE_SPI 0x400
#define MMC_MODE_HC 0x800
#define MMC_MODE_MASK_WIDTH_BITS (MMC_MODE_4BIT | MMC_MODE_8BIT)
#define MMC_MODE_WIDTH_BITS_SHIFT 8
#define SD_DATA_4BIT 0x00040000
#define IS_SD(x) (x->version & SD_VERSION_SD)