commit 283620c2c94ed018084962ea08047a31eaaa0a33
author Peng Fan <peng.fan@nxp.com> Tue Jan 02 16:51:22 2018 +0800
committer Jaehoon Chung <jh80.chung@samsung.com> Sat Jan 13 00:08:44 2018 +0900
tree 24ed846db8b25f6fadb589f134304f3edbcf4598
parent ec896575c550e70d8c9af3567c96b08d6b64a3fe

mmc: fsl_esdhc: Fix eMMC 1.8v setting issue

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

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index cca57f8..71c62f4 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -647,7 +647,11 @@
 	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 @@
 	/* 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;
 }