This is a note to let you know that I've just added the patch titled
net: stmmac: dwmac4: extend timeout for VLAN Tag register busy bit check
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-stmmac-dwmac4-extend-timeout-for-vlan-tag-regist.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9240a7846a65ae512ce182a6d6694a606f0bc001
Author: Shenwei Wang <shenwei.wang@xxxxxxx>
Date: Tue Sep 24 15:54:24 2024 -0500
net: stmmac: dwmac4: extend timeout for VLAN Tag register busy bit check
[ 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@xxxxxxx>
Signed-off-by: Shenwei Wang <shenwei.wang@xxxxxxx>
Link: https://patch.msgid.link/20240924205424.573913-1-shenwei.wang@xxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index bf99495b51a9c..a9837985a483d 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"
@@ -475,7 +476,7 @@ 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)
@@ -491,16 +492,15 @@ 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,
