[U-Boot] [PATCH v3] dw_mmc: turn on the IO supply

[Urja Rannikko]

Fixes the microSD slot on the ASUS C201.

Signed-off-by: Urja Rannikko <urjaman at gmail.com>
---
v2: use #if CONFIG_IS_ENABLED(DM_REGULATOR)
v3: Move ret variable inside the if block (only used there)
---
 drivers/mmc/dw_mmc.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 1992d61182..22f6c7eefd 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -13,6 +13,7 @@
 #include <mmc.h>
 #include <dwmmc.h>
 #include <wait_bit.h>
+#include <power/regulator.h>
 
 #define PAGE_SIZE 4096
 
@@ -493,6 +494,21 @@ static int dwmci_set_ios(struct mmc *mmc)
 	if (host->clksel)
 		host->clksel(host);
 
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+	if (mmc->vqmmc_supply) {
+		int ret;
+
+		if (mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180)
+			regulator_set_value(mmc->vqmmc_supply, 1800000);
+		else
+			regulator_set_value(mmc->vqmmc_supply, 3300000);
+
+		ret = regulator_set_enable_if_allowed(mmc->vqmmc_supply, true);
+		if (ret)
+			return ret;
+	}
+#endif
+
 	return 0;
 }
 
-- 
2.21.0