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net: stmmac: block PHY RXC clock-stop

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The DesignWare core requires the receive clock to be running during
certain operations. Ensure that we block PHY RXC clock-stop during
these operations.

This is a best-efforts change - not everywhere can be covered by this
because of net's core locking, which means we can't access the MDIO
bus to configure the PHY to disable RXC clock-stop in certain areas.
These are marked with FIXME comments.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1tvO6p-008Vjz-Qy@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King (Oracle)
2025-03-20 22:11:27 +00:00
committed by Jakub Kicinski
parent ddf4bd3f73
commit dd557266cf
1 changed files with 27 additions and 0 deletions
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27
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@@ -3484,9 +3484,18 @@ static int stmmac_hw_setup(struct net_device *dev, bool ptp_register)
if (priv->hw->phylink_pcs)
phylink_pcs_pre_init(priv->phylink, priv->hw->phylink_pcs);
/* Note that clk_rx_i must be running for reset to complete. This
* clock may also be required when setting the MAC address.
*
* Block the receive clock stop for LPI mode at the PHY in case
* the link is established with EEE mode active.
*/
phylink_rx_clk_stop_block(priv->phylink);
/* DMA initialization and SW reset */
ret = stmmac_init_dma_engine(priv);
if (ret < 0) {
phylink_rx_clk_stop_unblock(priv->phylink);
netdev_err(priv->dev, "%s: DMA engine initialization failed\n",
__func__);
return ret;
@@ -3494,6 +3503,7 @@ static int stmmac_hw_setup(struct net_device *dev, bool ptp_register)
/* Copy the MAC addr into the HW */
stmmac_set_umac_addr(priv, priv->hw, dev->dev_addr, 0);
phylink_rx_clk_stop_unblock(priv->phylink);
/* PS and related bits will be programmed according to the speed */
if (priv->hw->pcs) {
@@ -3604,7 +3614,9 @@ static int stmmac_hw_setup(struct net_device *dev, bool ptp_register)
/* Start the ball rolling... */
stmmac_start_all_dma(priv);
phylink_rx_clk_stop_block(priv->phylink);
stmmac_set_hw_vlan_mode(priv, priv->hw);
phylink_rx_clk_stop_unblock(priv->phylink);
return 0;
}
@@ -5888,6 +5900,9 @@ static void stmmac_tx_timeout(struct net_device *dev, unsigned int txqueue)
* whenever multicast addresses must be enabled/disabled.
* Return value:
* void.
*
* FIXME: This may need RXC to be running, but it may be called with BH
* disabled, which means we can't call phylink_rx_clk_stop*().
*/
static void stmmac_set_rx_mode(struct net_device *dev)
{
@@ -6020,7 +6035,9 @@ static int stmmac_set_features(struct net_device *netdev,
else
priv->hw->hw_vlan_en = false;
phylink_rx_clk_stop_block(priv->phylink);
stmmac_set_hw_vlan_mode(priv, priv->hw);
phylink_rx_clk_stop_unblock(priv->phylink);
return 0;
}
@@ -6304,7 +6321,9 @@ static int stmmac_set_mac_address(struct net_device *ndev, void *addr)
if (ret)
goto set_mac_error;
phylink_rx_clk_stop_block(priv->phylink);
stmmac_set_umac_addr(priv, priv->hw, ndev->dev_addr, 0);
phylink_rx_clk_stop_unblock(priv->phylink);
set_mac_error:
pm_runtime_put(priv->device);
@@ -6660,6 +6679,9 @@ static int stmmac_vlan_update(struct stmmac_priv *priv, bool is_double)
return stmmac_update_vlan_hash(priv, priv->hw, hash, pmatch, is_double);
}
/* FIXME: This may need RXC to be running, but it may be called with BH
* disabled, which means we can't call phylink_rx_clk_stop*().
*/
static int stmmac_vlan_rx_add_vid(struct net_device *ndev, __be16 proto, u16 vid)
{
struct stmmac_priv *priv = netdev_priv(ndev);
@@ -6691,6 +6713,9 @@ err_pm_put:
return ret;
}
/* FIXME: This may need RXC to be running, but it may be called with BH
* disabled, which means we can't call phylink_rx_clk_stop*().
*/
static int stmmac_vlan_rx_kill_vid(struct net_device *ndev, __be16 proto, u16 vid)
{
struct stmmac_priv *priv = netdev_priv(ndev);
@@ -7951,9 +7976,11 @@ int stmmac_resume(struct device *dev)
stmmac_hw_setup(ndev, false);
stmmac_init_coalesce(priv);
phylink_rx_clk_stop_block(priv->phylink);
stmmac_set_rx_mode(ndev);
stmmac_restore_hw_vlan_rx_fltr(priv, ndev, priv->hw);
phylink_rx_clk_stop_unblock(priv->phylink);
stmmac_enable_all_queues(priv);
stmmac_enable_all_dma_irq(priv);