Commit 43e57631 authored Jan 20, 2021 by Michael Walle Committed by Jakub Kicinski Jan 21, 2021

net: macb: 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
warning:
  macb e000b000.ethernet eth0: unable to generate target frequency: 25000000 Hz

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20210120194303.28268-1-michael@walle.cc


Signed-off-by: Jakub Kicinski <kuba@kernel.org>

parent 19038523

drivers/net/ethernet/cadence/macb_main.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -470,6 +470,10 @@ static void macb_set_tx_clk(struct macb *bp, int speed)
		if (!bp->tx_clk \|\| (bp->caps & MACB_CAPS_CLK_HW_CHG))
		return;

		/* In case of MII the PHY is the clock master */
		if (bp->phy_interface == PHY_INTERFACE_MODE_MII)
		return;

		switch (speed) {
		case SPEED_10:
		rate = 2500000;