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 <[email protected]> Signed-off-by: Peng Fan <[email protected]> --- 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(®s->clktunectrlstatus, 0x0); /* Put VEND_SPEC to default value */ - esdhc_write32(®s->vendorspec, VENDORSPEC_INIT); + if (priv->vs18_enable) + esdhc_write32(®s->vendorspec, (VENDORSPEC_INIT | + ESDHC_VENDORSPEC_VSELECT)); + else + esdhc_write32(®s->vendorspec, VENDORSPEC_INIT); /* Disable DLL_CTRL delay line */ esdhc_write32(®s->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(®s->sysctl, SYSCTL_TIMEOUT_MASK, 14 << 16); - if (priv->vs18_enable) - esdhc_setbits32(®s->vendorspec, ESDHC_VENDORSPEC_VSELECT); - return 0; } -- 1.9.1 _______________________________________________ U-Boot mailing list [email protected] https://lists.denx.de/listinfo/u-boot
