ARM: OMAP3: mmc-twl4030 fix for vmmc = 0
Resolve longstanding issue noted by Adrian Hunter: confusion
between settting VSEL=0 (which is 1.8V on MMC1) and poweroff.
Also, leave VSEL alone if we're just powering the regulator off.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/mmc-twl4030.c b/arch/arm/mach-omap2/mmc-twl4030.c
index d9fad8d..d434214 100644
--- a/arch/arm/mach-omap2/mmc-twl4030.c
+++ b/arch/arm/mach-omap2/mmc-twl4030.c
@@ -178,7 +178,10 @@
static int twl_mmc_set_voltage(struct twl_mmc_controller *c, int vdd)
{
int ret;
- u8 vmmc, dev_grp_val;
+ u8 vmmc = 0, dev_grp_val;
+
+ if (!vdd)
+ goto doit;
if (c->twl_vmmc_dev_grp == VMMC1_DEV_GRP) {
/* VMMC1: max 220 mA. And for 8-bit mode,
@@ -203,8 +206,7 @@
/* error if VSIM needed */
break;
default:
- vmmc = 0;
- break;
+ return -EINVAL;
}
} else if (c->twl_vmmc_dev_grp == VMMC2_DEV_GRP) {
/* VMMC2: max 100 mA */
@@ -230,21 +232,21 @@
vmmc = VMMC2_315V;
break;
default:
- vmmc = 0;
- break;
+ return -EINVAL;
}
} else {
- return 0;
+ return -EINVAL;
}
- if (vmmc)
+doit:
+ if (vdd)
dev_grp_val = VMMC_DEV_GRP_P1; /* Power up */
else
dev_grp_val = LDO_CLR; /* Power down */
ret = twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
dev_grp_val, c->twl_vmmc_dev_grp);
- if (ret)
+ if (ret || !vdd)
return ret;
ret = twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,