mmc: core: Use dev_err_probe for deferred regulators

In case vmmc or vqmmc regulator is not available yet, use dev_err_probe
in order to set a deferred probe reason. This is a helpful hint in
/sys/kernel/debug/devices_deferred

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Link: https://lore.kernel.org/r/20240911090910.3060749-1-alexander.stein@ew.tq-group.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: tq-steina

drivers/mmc/core/regulator.c

@@ -255,7 +255,9 @@ int mmc_regulator_get_supply(struct mmc_host *mmc)
 
 	if (IS_ERR(mmc->supply.vmmc)) {
 		if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
+			return dev_err_probe(dev, -EPROBE_DEFER,
+					     "vmmc regulator not available\n");
+
 		dev_dbg(dev, "No vmmc regulator found\n");
 	} else {
 		ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
@@ -267,7 +269,9 @@ int mmc_regulator_get_supply(struct mmc_host *mmc)
 
 	if (IS_ERR(mmc->supply.vqmmc)) {
 		if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
+			return dev_err_probe(dev, -EPROBE_DEFER,
+					     "vqmmc regulator not available\n");
+
 		dev_dbg(dev, "No vqmmc regulator found\n");
 	}