[RFC PATCH v1] net: ethernet: nb8800: Reset HW block in ndo_open
From: Måns Rullgård <hidden>
Date: 2017-07-28 16:17:42
Marc Gonzalez [off-list ref] writes:
ndo_stop breaks RX in a way that ndo_open is unable to undo.
Please elaborate. Why can't it be fixed in a less heavy-handed way?
Work around the issue by resetting the HW in ndo_open. This will provide the basis for suspend/resume support. Signed-off-by: Marc Gonzalez <redacted> --- drivers/net/ethernet/aurora/nb8800.c | 40 +++++++++++++++++------------------- drivers/net/ethernet/aurora/nb8800.h | 1 + 2 files changed, 20 insertions(+), 21 deletions(-)
I'm pretty sure this doesn't preserve everything it should.
quoted hunk
diff --git a/drivers/net/ethernet/aurora/nb8800.c b/drivers/net/ethernet/aurora/nb8800.c index e94159507847..954a28542c3b 100644 --- a/drivers/net/ethernet/aurora/nb8800.c +++ b/drivers/net/ethernet/aurora/nb8800.c@@ -39,6 +39,7 @@ #include "nb8800.h" +static void nb8800_init(struct net_device *dev); static void nb8800_tx_done(struct net_device *dev); static int nb8800_dma_stop(struct net_device *dev);@@ -957,6 +958,8 @@ static int nb8800_open(struct net_device *dev) struct phy_device *phydev; int err; + nb8800_init(dev); + /* clear any pending interrupts */ nb8800_writel(priv, NB8800_RXC_SR, 0xf); nb8800_writel(priv, NB8800_TXC_SR, 0xf);@@ -1350,6 +1353,20 @@ static const struct of_device_id nb8800_dt_ids[] = { }; MODULE_DEVICE_TABLE(of, nb8800_dt_ids); +static void nb8800_init(struct net_device *dev) +{ + struct nb8800_priv *priv = netdev_priv(dev); + const struct nb8800_ops *ops = priv->ops; + + if (ops && ops->reset) + ops->reset(dev); + nb8800_hw_init(dev); + if (ops && ops->init) + ops->init(dev); + nb8800_update_mac_addr(dev); + priv->speed = 0; +} + static int nb8800_probe(struct platform_device *pdev) { const struct of_device_id *match;@@ -1389,6 +1406,7 @@ static int nb8800_probe(struct platform_device *pdev) priv = netdev_priv(dev); priv->base = base; + priv->ops = ops; priv->phy_mode = of_get_phy_mode(pdev->dev.of_node); if (priv->phy_mode < 0)@@ -1407,12 +1425,6 @@ static int nb8800_probe(struct platform_device *pdev) spin_lock_init(&priv->tx_lock); - if (ops && ops->reset) { - ret = ops->reset(dev); - if (ret) - goto err_disable_clk; - } - bus = devm_mdiobus_alloc(&pdev->dev); if (!bus) { ret = -ENOMEM;@@ -1454,16 +1466,6 @@ static int nb8800_probe(struct platform_device *pdev) priv->mii_bus = bus; - ret = nb8800_hw_init(dev); - if (ret) - goto err_deregister_fixed_link; - - if (ops && ops->init) { - ret = ops->init(dev); - if (ret) - goto err_deregister_fixed_link; - } - dev->netdev_ops = &nb8800_netdev_ops; dev->ethtool_ops = &nb8800_ethtool_ops; dev->flags |= IFF_MULTICAST;@@ -1476,14 +1478,12 @@ static int nb8800_probe(struct platform_device *pdev) if (!is_valid_ether_addr(dev->dev_addr)) eth_hw_addr_random(dev); - nb8800_update_mac_addr(dev); - netif_carrier_off(dev); ret = register_netdev(dev); if (ret) { netdev_err(dev, "failed to register netdev\n"); - goto err_free_dma; + goto err_deregister_fixed_link; } netif_napi_add(dev, &priv->napi, nb8800_poll, NAPI_POLL_WEIGHT);@@ -1492,8 +1492,6 @@ static int nb8800_probe(struct platform_device *pdev) return 0; -err_free_dma: - nb8800_dma_free(dev); err_deregister_fixed_link: if (of_phy_is_fixed_link(pdev->dev.of_node)) of_phy_deregister_fixed_link(pdev->dev.of_node);diff --git a/drivers/net/ethernet/aurora/nb8800.h b/drivers/net/ethernet/aurora/nb8800.h index 6ec4a956e1e5..d5f4481a2c7b 100644 --- a/drivers/net/ethernet/aurora/nb8800.h +++ b/drivers/net/ethernet/aurora/nb8800.h@@ -305,6 +305,7 @@ struct nb8800_priv { dma_addr_t tx_desc_dma; struct clk *clk; + const struct nb8800_ops *ops; }; struct nb8800_ops {-- 2.11.0
-- Måns Rullgård