net: dwc_eth_qos: Enable clock in probe

Enable DWC IP clock in driver probe, so the MII access is possible even
outside of active network transfers. This is particularly useful when
using 'mii' or 'mdio' commands to explore PHY state, neither of which
works with DWMAC currently due to the disabled clock.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Cc: Ramon Fried <rfried.dev@gmail.com>
Cc: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>

diff --git a/drivers/net/dwc_eth_qos.c b/drivers/net/dwc_eth_qos.c
index 585101804d335890b9f32697f6f308faaf968599..22dad5b2030a4eb37bc056ad9c0e2a2c5a20f26c 100644 (file)
--- a/drivers/net/dwc_eth_qos.c
+++ b/drivers/net/dwc_eth_qos.c
@@ -1045,16 +1045,10 @@ static int eqos_start(struct udevice *dev)
        eqos->tx_desc_idx = 0;
        eqos->rx_desc_idx = 0;
 
-       ret = eqos->config->ops->eqos_start_clks(dev);
-       if (ret < 0) {
-               pr_err("eqos_start_clks() failed: %d", ret);
-               goto err;
-       }
-
        ret = eqos->config->ops->eqos_start_resets(dev);
        if (ret < 0) {
                pr_err("eqos_start_resets() failed: %d", ret);
-               goto err_stop_clks;
+               goto err;
        }
 
        udelay(10);
@@ -1360,8 +1354,6 @@ err_shutdown_phy:
        phy_shutdown(eqos->phy);
 err_stop_resets:
        eqos->config->ops->eqos_stop_resets(dev);
-err_stop_clks:
-       eqos->config->ops->eqos_stop_clks(dev);
 err:
        pr_err("FAILED: %d", ret);
        return ret;
@@ -1416,7 +1408,6 @@ static void eqos_stop(struct udevice *dev)
                phy_shutdown(eqos->phy);
        }
        eqos->config->ops->eqos_stop_resets(dev);
-       eqos->config->ops->eqos_stop_clks(dev);
 
        debug("%s: OK\n", __func__);
 }
@@ -1862,6 +1853,12 @@ static int eqos_probe(struct udevice *dev)
                goto err_remove_resources_core;
        }
 
+       ret = eqos->config->ops->eqos_start_clks(dev);
+       if (ret < 0) {
+               pr_err("eqos_start_clks() failed: %d", ret);
+               goto err_remove_resources_tegra;
+       }
+
 #ifdef CONFIG_DM_ETH_PHY
        eqos->mii = eth_phy_get_mdio_bus(dev);
 #endif
@@ -1870,7 +1867,7 @@ static int eqos_probe(struct udevice *dev)
                if (!eqos->mii) {
                        pr_err("mdio_alloc() failed");
                        ret = -ENOMEM;
-                       goto err_remove_resources_tegra;
+                       goto err_stop_clks;
                }
                eqos->mii->read = eqos_mdio_read;
                eqos->mii->write = eqos_mdio_write;
@@ -1893,6 +1890,8 @@ static int eqos_probe(struct udevice *dev)
 
 err_free_mdio:
        mdio_free(eqos->mii);
+err_stop_clks:
+       eqos->config->ops->eqos_stop_clks(dev);
 err_remove_resources_tegra:
        eqos->config->ops->eqos_remove_resources(dev);
 err_remove_resources_core:
@@ -1910,6 +1909,7 @@ static int eqos_remove(struct udevice *dev)
 
        mdio_unregister(eqos->mii);
        mdio_free(eqos->mii);
+       eqos->config->ops->eqos_stop_clks(dev);
        eqos->config->ops->eqos_remove_resources(dev);
 
        eqos_probe_resources_core(dev);