mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-25 00:11:13 +00:00
66 lines
2.3 KiB
Diff
66 lines
2.3 KiB
Diff
From 29109f495f5842f4e9a09ffb54ae3e13298fff07 Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
|
Date: Fri, 2 Aug 2019 22:25:27 +0100
|
|
Subject: [PATCH 749/773] net: bcmgenet: Workaround for Pi 4B network issue
|
|
|
|
Some combinations of Pi 4Bs and Ethernet switches don't reliably get a
|
|
DCHP-assigned IP address, leaving the unit with a self=assigned 169.254
|
|
address.
|
|
|
|
Forcing renegotiation has been found to be an effective workaround, so
|
|
add an automatic renegotiation after the link comes up for the first
|
|
time; enable it with genet.force_reneg=y - by default it is disabled.
|
|
|
|
See: https://github.com/raspberrypi/linux/issues/3108
|
|
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
|
|
---
|
|
.../net/ethernet/broadcom/genet/bcmgenet.c | 22 +++++++++++++++++++
|
|
1 file changed, 22 insertions(+)
|
|
|
|
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
|
|
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
|
|
@@ -72,6 +72,10 @@
|
|
#define GENET_RDMA_REG_OFF (priv->hw_params->rdma_offset + \
|
|
TOTAL_DESC * DMA_DESC_SIZE)
|
|
|
|
+static bool force_reneg = false;
|
|
+module_param(force_reneg, bool, 0444);
|
|
+MODULE_PARM_DESC(force_reneg, "Force a renegotiation after the initial link-up");
|
|
+
|
|
static inline void bcmgenet_writel(u32 value, void __iomem *offset)
|
|
{
|
|
/* MIPS chips strapped for BE will automagically configure the
|
|
@@ -2610,6 +2614,7 @@ static void bcmgenet_irq_task(struct wor
|
|
unsigned int status;
|
|
struct bcmgenet_priv *priv = container_of(
|
|
work, struct bcmgenet_priv, bcmgenet_irq_work);
|
|
+ static int first_link = 1;
|
|
|
|
netif_dbg(priv, intr, priv->dev, "%s\n", __func__);
|
|
|
|
@@ -2622,6 +2627,23 @@ static void bcmgenet_irq_task(struct wor
|
|
if (status & UMAC_IRQ_LINK_EVENT) {
|
|
priv->dev->phydev->link = !!(status & UMAC_IRQ_LINK_UP);
|
|
phy_mac_interrupt(priv->dev->phydev);
|
|
+
|
|
+ if (priv->dev->phydev->link && first_link) {
|
|
+ first_link = 0;
|
|
+ /*
|
|
+ * HACK: Some Pi4Bs, when paired with some switches,
|
|
+ * come up in a strange state where they are unable to
|
|
+ * transmit, causing them to fail to get an IP address.
|
|
+ * Although the failure mechanism is not yet understood,
|
|
+ * forcing renegotiation at this point has been shown
|
|
+ * to be effective in avoiding the problem.
|
|
+ */
|
|
+ if (force_reneg) {
|
|
+ dev_info(&priv->pdev->dev,
|
|
+ "Forcing renegotiation\n");
|
|
+ genphy_restart_aneg(priv->dev->phydev);
|
|
+ }
|
|
+ }
|
|
}
|
|
}
|
|
|