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mmc: fsl_esdhc: Fix eMMC 1.8v setting issue

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Current USDHC driver will reset VSELECT to 0 (3.3v) during mmc init,
then set to 1 for 1.8v eMMC I/O. When booting from eMMC, since ROM has
already set VSELECT to 1.8v before running the u-boot. This reset in
USDHC driver causes a short 2.2v pulse on CMD pin.

Fix this issue by not reset VSELECT to 0 when 1.8v flag is set.

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Peng Fan 2018-01-02 16:51:22 +08:00 committed by Jaehoon Chung
parent 8c0bb85824
commit db359efd59
1 changed files with 5 additions and 4 deletions
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9
drivers/mmc/fsl_esdhc.c
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@ -647,7 +647,11 @@ static int esdhc_init_common(struct fsl_esdhc_priv *priv, struct mmc *mmc)
esdhc_write32(&regs->clktunectrlstatus, 0x0);
/* Put VEND_SPEC to default value */
esdhc_write32(&regs->vendorspec, VENDORSPEC_INIT);
if (priv->vs18_enable)
esdhc_write32(&regs->vendorspec, (VENDORSPEC_INIT |
ESDHC_VENDORSPEC_VSELECT));
else
esdhc_write32(&regs->vendorspec, VENDORSPEC_INIT);
/* Disable DLL_CTRL delay line */
esdhc_write32(&regs->dllctrl, 0x0);
@ -676,9 +680,6 @@ static int esdhc_init_common(struct fsl_esdhc_priv *priv, struct mmc *mmc)
/* Set timout to the maximum value */
esdhc_clrsetbits32(&regs->sysctl, SYSCTL_TIMEOUT_MASK, 14 << 16);
if (priv->vs18_enable)
esdhc_setbits32(&regs->vendorspec, ESDHC_VENDORSPEC_VSELECT);
return 0;
}