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bcm47xx: fix bgmac regression present in 5.10 kernel

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This fixes:
[    2.548098] bgmac_bcma bcma0:1: Failed to register fixed PHY device
[    2.554584] bgmac_bcma bcma0:1: Cannot connect to phy
and downstream (swconfig-based) b53 driver failing to load.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki 2021-11-08 15:55:40 +01:00
parent 4cd97e4760
commit 6cdac99401
1 changed files with 42 additions and 0 deletions
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42
target/linux/bcm47xx/patches-5.10/700-net-bgmac-connect-to-PHY-even-if-it-is-BGMAC_PHY_NOR.patch Normal file
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@ -0,0 +1,42 @@
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Sun, 7 Nov 2021 14:20:40 +0100
Subject: [PATCH] net: bgmac: connect to PHY even if it is BGMAC_PHY_NOREGS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Recent bgmac change was meant to just fix a race between "Generic PHY"
and "bcm53xx" drivers after -EPROBE_DEFER. It modified bgmac to use
phy_connect() only if there is a real PHY device connected.
That change broke bgmac on bcm47xx. bcma_phy_connect() now registers a
fixed PHY with the bgmac_phy_connect_direct(). That fails as another
fixed PHY (also using address 0) is already registered - by bcm47xx arch
code bcm47xx_register_bus_complete().
This change brings origial behaviour. It connects Ethernet interface
with pseudo-PHY (switch device) and adjusts Ethernet interface link to
match connected switch.
This fixes:
[ 2.548098] bgmac_bcma bcma0:1: Failed to register fixed PHY device
[ 2.554584] bgmac_bcma bcma0:1: Cannot connect to phy
Fixes: b5375509184d ("net: bgmac: improve handling PHY")
Link: https://lore.kernel.org/netdev/3639116e-9292-03ca-b9d9-d741118a4541@gmail.com/T/#u
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
drivers/net/ethernet/broadcom/bgmac-bcma.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/bgmac-bcma.c
+++ b/drivers/net/ethernet/broadcom/bgmac-bcma.c
@@ -94,7 +94,7 @@ static int bcma_phy_connect(struct bgmac
return 0;
/* Connect to the PHY */
- if (bgmac->mii_bus && bgmac->phyaddr != BGMAC_PHY_NOREGS) {
+ if (bgmac->mii_bus) {
snprintf(bus_id, sizeof(bus_id), PHY_ID_FMT, bgmac->mii_bus->id,
bgmac->phyaddr);
phy_dev = phy_connect(bgmac->net_dev, bus_id, bgmac_adjust_link,