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mmc: fsl_esdhc: Add support to force VSELECT set

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Some boards cannot do voltage negotiation but need to set the VSELECT
bit forcely to ensure it to work at 1.8V.

This commit adds CONFIG_SYS_FSL_ESDHC_FORCE_VSELECT flag for this use.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
This commit is contained in:
Otavio Salvador 2015-02-17 10:42:44 -02:00 committed by Stefano Babic
parent f022d36e8a
commit ee0c538951
2 changed files with 5 additions and 0 deletions
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1
doc/README.fsl-esdhc
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@ -1,5 +1,6 @@
CONFIG_SYS_FSL_ESDHC_LE means ESDHC IP is in little-endian mode.
CONFIG_SYS_FSL_ESDHC_BE means ESDHC IP is in big-endian mode.
CONFIG_SYS_FSL_ESDHC_FORCE_VSELECT forces to run at 1.8V.
Accessing ESDHC registers can be determined by ESDHC IP's endian
mode or processor's endian mode.

4
drivers/mmc/fsl_esdhc.c
View File

@ -523,6 +523,10 @@ static int esdhc_init(struct mmc *mmc)
/* Set timout to the maximum value */
esdhc_clrsetbits32(&regs->sysctl, SYSCTL_TIMEOUT_MASK, 14 << 16);
#ifdef CONFIG_SYS_FSL_ESDHC_FORCE_VSELECT
esdhc_setbits32(&regs->vendorspec, ESDHC_VENDORSPEC_VSELECT);
#endif
return 0;
}