5.15-stable review patch. If anyone has any objections, please let me know.
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From: Shenwei Wang shenwei.wang@nxp.com
[ Upstream commit 4c1b56671b68ffcbe6b78308bfdda6bcce6491ae ]
Increase the timeout for checking the busy bit of the VLAN Tag register from 10µs to 500ms. This change is necessary to accommodate scenarios where Energy Efficient Ethernet (EEE) is enabled.
Overnight testing revealed that when EEE is active, the busy bit can remain set for up to approximately 300ms. The new 500ms timeout provides a safety margin.
Fixes: ed64639bc1e0 ("net: stmmac: Add support for VLAN Rx filtering") Reviewed-by: Andrew Lunn andrew@lunn.ch Signed-off-by: Shenwei Wang shenwei.wang@nxp.com Link: https://patch.msgid.link/20240924205424.573913-1-shenwei.wang@nxp.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- .../net/ethernet/stmicro/stmmac/dwmac4_core.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c index 687eb17e41c6e..c75868f3ceae1 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c @@ -14,6 +14,7 @@ #include <linux/slab.h> #include <linux/ethtool.h> #include <linux/io.h> +#include <linux/iopoll.h> #include "stmmac.h" #include "stmmac_pcs.h" #include "dwmac4.h" @@ -469,7 +470,7 @@ static int dwmac4_write_vlan_filter(struct net_device *dev, u8 index, u32 data) { void __iomem *ioaddr = (void __iomem *)dev->base_addr; - int i, timeout = 10; + int ret; u32 val;
if (index >= hw->num_vlan) @@ -485,16 +486,15 @@ static int dwmac4_write_vlan_filter(struct net_device *dev,
writel(val, ioaddr + GMAC_VLAN_TAG);
- for (i = 0; i < timeout; i++) { - val = readl(ioaddr + GMAC_VLAN_TAG); - if (!(val & GMAC_VLAN_TAG_CTRL_OB)) - return 0; - udelay(1); + ret = readl_poll_timeout(ioaddr + GMAC_VLAN_TAG, val, + !(val & GMAC_VLAN_TAG_CTRL_OB), + 1000, 500000); + if (ret) { + netdev_err(dev, "Timeout accessing MAC_VLAN_Tag_Filter\n"); + return -EBUSY; }
- netdev_err(dev, "Timeout accessing MAC_VLAN_Tag_Filter\n"); - - return -EBUSY; + return 0; }
static int dwmac4_add_hw_vlan_rx_fltr(struct net_device *dev,