[PATCH v2] mmc: zynq_sdhci: Reset the host controller

[Venkatesh Yadav Abbarapu]

Reset the host controller at the early stage of probe so that the
configuration will be done properly for reboot cases.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu at amd.com>
---
Changes in v2:
- Reset is optional, so don't return if reset property is not found from
the device tree.
---
 drivers/mmc/zynq_sdhci.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/mmc/zynq_sdhci.c b/drivers/mmc/zynq_sdhci.c
index 0e2bdab4e7e..4d1f92931a3 100644
--- a/drivers/mmc/zynq_sdhci.c
+++ b/drivers/mmc/zynq_sdhci.c
@@ -1127,6 +1127,28 @@ static int arasan_sdhci_probe(struct udevice *dev)
 	if (arasan_sdhci_is_compatible(dev, SDHCI_COMPATIBLE_VERSAL_NET_EMMC))
 		priv->internal_phy_reg = true;
 
+	ret = reset_get_bulk(dev, &priv->resets);
+	if (ret == -ENOTSUPP || ret == -ENOENT) {
+		dev_warn(dev, "Reset not found\n");
+	} else if (ret) {
+		dev_err(dev, "Reset failed\n");
+		return ret;
+	}
+
+	if (!ret) {
+		ret = reset_assert_bulk(&priv->resets);
+		if (ret) {
+			dev_err(dev, "Reset assert failed\n");
+			return ret;
+		}
+
+		ret = reset_deassert_bulk(&priv->resets);
+		if (ret) {
+			dev_err(dev, "Reset release failed\n");
+			return ret;
+		}
+	}
+
 	ret = clk_get_by_index(dev, 0, &clk);
 	if (ret < 0) {
 		dev_err(dev, "failed to get clock\n");
-- 
2.34.1