[PATCH] mmc: msm_sdhci: enable vqmmc at probe if available

[Neil Armstrong]

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 at linaro.org>
---
 drivers/mmc/msm_sdhci.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/mmc/msm_sdhci.c b/drivers/mmc/msm_sdhci.c
index 4e5c932c071..27bb7052fca 100644
--- 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);

---
base-commit: d5cab0d6adc26ec1bbd45c2fed101184d04454ae
change-id: 20241016-topic-sm8x50-mmc-vqmmc-b7cf8176ec51

Best regards,
-- 
Neil Armstrong <neil.armstrong at linaro.org>