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 461805a..703e224 100644
--- a/drivers/net/zynq_gem.c
+++ b/drivers/net/zynq_gem.c
@@ -567,12 +567,14 @@
}
#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;
+ }
}
}