From: Andre Przywara <andre.przywara@arm.com>
Date: Mon, 6 Jul 2020 00:40:42 +0000 (+0100)
Subject: net: sun8i_emac: Fix MAC soft reset
X-Git-Url: http://git.dujemihanovic.xyz/html/static/git-favicon.png?a=commitdiff_plain;h=2c5600c38ce642e1763afe4f3b5fb6dd8f442aa5;p=u-boot.git

net: sun8i_emac: Fix MAC soft reset

The EMAC soft reset routine was subtly broken, using an open coded
timeout routine without any actual delay.
Remove the unneeded initial reset bit read, and call wait_for_bit_le32()
to handle the timeout correctly.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Tested-by: Amit Singh Tomar <amittomer25@gmail.com> # Pine64+
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
---

diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c
index 1ae5bfd388..f7c55b3c96 100644
--- a/drivers/net/sun8i_emac.c
+++ b/drivers/net/sun8i_emac.c
@@ -447,22 +447,15 @@ static void tx_descs_init(struct emac_eth_dev *priv)
 static int sun8i_emac_eth_start(struct udevice *dev)
 {
 	struct emac_eth_dev *priv = dev_get_priv(dev);
-	u32 reg;
-	int timeout = 100;
 	int ret;
 
-	reg = readl((priv->mac_reg + EMAC_CTL1));
-
-	if (!(reg & 0x1)) {
-		/* Soft reset MAC */
-		setbits_le32((priv->mac_reg + EMAC_CTL1), 0x1);
-		do {
-			reg = readl(priv->mac_reg + EMAC_CTL1);
-		} while ((reg & 0x01) != 0 &&  (--timeout));
-		if (!timeout) {
-			printf("%s: Timeout\n", __func__);
-			return -1;
-		}
+	/* Soft reset MAC */
+	writel(EMAC_CTL1_SOFT_RST, priv->mac_reg + EMAC_CTL1);
+	ret = wait_for_bit_le32(priv->mac_reg + EMAC_CTL1,
+				EMAC_CTL1_SOFT_RST, false, 10, true);
+	if (ret) {
+		printf("%s: Timeout\n", __func__);
+		return ret;
 	}
 
 	/* Rewrite mac address after reset */