From: Martin Kaistra <martin.kaistra@linutronix.de>
Date: Tue, 15 Apr 2025 15:04:00 +0000 (+0200)
Subject: net: gem: ignore tx_clk if MII is used
X-Git-Tag: v2025.07-rc4~7^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6759bd73e9cf491c5049f87b84e627920efb5824;p=pandora-u-boot.git

net: gem: ignore tx_clk if MII is used

If the MII interface is used, the PHY is the clock master, thus don't
set the clock rate. On Zynq-7000, this will prevent the following
error:
  zynq_gem ethernet@e000b000: failed to set tx clock rate 25000000

Signed-off-by: Martin Kaistra <martin.kaistra@linutronix.de>
Link: https://lore.kernel.org/r/20250415150400.136723-1-martin.kaistra@linutronix.de
Signed-off-by: Michal Simek <michal.simek@amd.com>
---

diff --git a/drivers/net/zynq_gem.c b/drivers/net/zynq_gem.c
index 461805ae53f..703e22479d2 100644
--- a/drivers/net/zynq_gem.c
+++ b/drivers/net/zynq_gem.c
@@ -567,12 +567,14 @@ static int zynq_gem_init(struct udevice *dev)
 	}
 #endif
 
-	ret = clk_get_rate(&priv->tx_clk);
-	if (ret != clk_rate) {
-		ret = clk_set_rate(&priv->tx_clk, clk_rate);
-		if (IS_ERR_VALUE(ret)) {
-			dev_err(dev, "failed to set tx clock rate %ld\n", clk_rate);
-			return ret;
+	if (priv->interface != PHY_INTERFACE_MODE_MII) {
+		ret = clk_get_rate(&priv->tx_clk);
+		if (ret != clk_rate) {
+			ret = clk_set_rate(&priv->tx_clk, clk_rate);
+			if (IS_ERR_VALUE(ret)) {
+				dev_err(dev, "failed to set tx clock rate %ld\n", clk_rate);
+				return ret;
+			}
 		}
 	}