mmc: msm_sdhci: enable vqmmc at probe if available

On earlier platforms, the vqmmc regulator was enabled by the
previous bootloader, but on the newest (SM8650) it's not
and we need vqmmc to be enabled in order to have the card
to respond.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>

diff --git a/drivers/mmc/msm_sdhci.c b/drivers/mmc/msm_sdhci.c
index 4e5c932c071f6bcb9ab9918d0ab6916d89a2d14e..27bb7052fca6b66a0722d006903045d3b0af4431 100644 (file)
--- a/drivers/mmc/msm_sdhci.c
+++ b/drivers/mmc/msm_sdhci.c
@@ -15,6 +15,7 @@
 #include <asm/global_data.h>
 #include <asm/io.h>
 #include <linux/bitops.h>
+#include <power/regulator.h>
 
 /* Non-standard registers needed for SDHCI startup */
 #define SDCC_MCI_POWER   0x0
@@ -43,6 +44,7 @@ struct msm_sdhc {
        struct sdhci_host host;
        void *base;
        struct clk_bulk clks;
+       struct udevice *vqmmc;
 };
 
 struct msm_sdhc_variant_info {
@@ -163,6 +165,16 @@ static int msm_sdc_probe(struct udevice *dev)
        if (ret)
                return ret;
 
+       /* Get the vqmmc regulator and enable it if available */
+       device_get_supply_regulator(dev, "vqmmc-supply", &prv->vqmmc);
+       if (prv->vqmmc) {
+               ret = regulator_set_enable_if_allowed(prv->vqmmc, true);
+               if (ret) {
+                       printf("Failed to enable the VQMMC regulator\n");
+                       return ret;
+               }
+       }
+
        var_info = (void *)dev_get_driver_data(dev);
        if (!var_info->mci_removed) {
                ret = msm_sdc_mci_init(prv);