net: ethernet: stmmac: dwmac-rk: make clk enablement first in powerup

Right now the dwmac-rk tries to set up the GRF-specific speed and link
options before enabling clocks, phys etc and on previous socs this works
because the GRF is supplied on the whole by one clock.

On the rk3399 however the GRF (General Register Files) clock-supply
has been split into multiple clocks and while there is no specific
grf-gmac clock like for other sub-blocks, it seems the mac-specific
portions are actually supplied by the general mac clock.

This results in hangs on rk3399 boards if the driver is build as module.
When built in te problem of course doesn't surface, as the clocks
are of course still on at the stage before clock_disable_unused.

To solve this, simply move the clock enablement to the first position
in the powerup callback. This is also a good idea in general to
enable clocks before everything else.

Tested on rk3288, rk3368 and rk3399 the dwmac still works on all of them.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index 77ab0a85f0673d4b2f5748403ecc249d520a5f00..fa6e9704c07779b6bc70d635765044360ff6adab 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -864,6 +864,10 @@ static int rk_gmac_powerup(struct rk_priv_data *bsp_priv)
        int ret;
        struct device *dev = &bsp_priv->pdev->dev;
 
+       ret = gmac_clk_enable(bsp_priv, true);
+       if (ret)
+               return ret;
+
        /*rmii or rgmii*/
        if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RGMII) {
                dev_info(dev, "init for RGMII\n");
@@ -880,10 +884,6 @@ static int rk_gmac_powerup(struct rk_priv_data *bsp_priv)
        if (ret)
                return ret;
 
-       ret = gmac_clk_enable(bsp_priv, true);
-       if (ret)
-               return ret;
-
        pm_runtime_enable(dev);
        pm_runtime_get_sync(dev);