From 128e363e406841fbbd9800199cb093b4737d7cba Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Fri, 9 Aug 2019 08:51:43 +0100 Subject: [PATCH] net: bcmgenet: Workaround #2 for Pi4 Ethernet fail 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. In the failure case, the Pi is left able to receive packets but not send them, suggesting that the MAC<->PHY link is getting into a bad state. It has been found empirically that skipping a reset step by the genet driver prevents the failures. No downsides have been discovered yet, and unlike the forced renegotiation it doesn't increase the time to get an IP address, so the workaround is enabled by default; add genet.skip_umac_reset=n to the command line to disable it. See: https://github.com/raspberrypi/linux/issues/3108 Signed-off-by: Phil Elwell --- drivers/net/ethernet/broadcom/genet/bcmgenet.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c @@ -72,6 +72,10 @@ /* Forward declarations */ static void bcmgenet_set_rx_mode(struct net_device *dev); +static bool skip_umac_reset = true; +module_param(skip_umac_reset, bool, 0444); +MODULE_PARM_DESC(skip_umac_reset, "Skip UMAC reset step"); + static inline void bcmgenet_writel(u32 value, void __iomem *offset) { /* MIPS chips strapped for BE will automagically configure the @@ -2003,6 +2007,11 @@ static void reset_umac(struct bcmgenet_p bcmgenet_rbuf_ctrl_set(priv, 0); udelay(10); + if (skip_umac_reset) { + pr_warn("Skipping UMAC reset\n"); + return; + } + /* disable MAC while updating its registers */ bcmgenet_umac_writel(priv, 0, UMAC_CMD);