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 --- drivers/mmc/fsl_esdhc.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index 499d622..4bbe4f9 100644 --- a/drivers/mmc/fsl_esdhc.c +++ b/drivers/mmc/fsl_esdhc.c @@ -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; }