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bmips: disable B53 MMAP phy read/write ops

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Without this change, internal and external B53 switches couldn't coexist as
reported in https://github.com/openwrt/openwrt/issues/10313.
In order to fix this we need to force the B53 MMAP DSA switch driver to use
bcm6368-mdio-mux for accessing the PHY registers instead of its own phy_read()
and phy_write() functions.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
This commit is contained in:
Álvaro Fernández Rojas 2023-03-21 19:36:16 +01:00
parent c6eb099db9
commit 82dc16fde0
2 changed files with 47 additions and 1 deletions
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2
target/linux/bmips/files/drivers/net/ethernet/broadcom/bcm6368-enetsw.c
View File

@ -22,7 +22,7 @@
#include <linux/reset.h>
/* MTU */
#define ENETSW_TAG_SIZE 6
#define ENETSW_TAG_SIZE (6 + VLAN_HLEN)
#define ENETSW_MTU_OVERHEAD (VLAN_ETH_HLEN + VLAN_HLEN + \
ENETSW_TAG_SIZE)
#define ENETSW_FRAG_SIZE(x) (SKB_DATA_ALIGN(NET_SKB_PAD + x + \

46
target/linux/bmips/patches-5.15/510-net-dsa-b53-mmap-disable-phy-read-write-ops.patch Normal file
View File

@ -0,0 +1,46 @@
From 03e31e5197a041857299c70bbbc461131156d434 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
Date: Tue, 21 Mar 2023 19:11:58 +0100
Subject: [PATCH] net: dsa: b53: mmap: disable phy read/write ops
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
B53 MMAP switches have a MDIO Mux bus controller which should be used instead
of phy_read() and phy_write() ops.
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---
drivers/net/dsa/b53/b53_mmap.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/drivers/net/dsa/b53/b53_mmap.c
+++ b/drivers/net/dsa/b53/b53_mmap.c
@@ -279,6 +279,7 @@ static int b53_mmap_probe(struct platfor
struct b53_platform_data *pdata = pdev->dev.platform_data;
struct b53_mmap_priv *priv;
struct b53_device *dev;
+ struct dsa_switch_ops *dso;
int ret;
if (!pdata && np) {
@@ -298,10 +299,19 @@ static int b53_mmap_probe(struct platfor
priv->regs = pdata->regs;
+ dso = devm_kzalloc(&pdev->dev, sizeof(*dso), GFP_KERNEL);
+ if (!dso)
+ return -ENOMEM;
+
dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, priv);
if (!dev)
return -ENOMEM;
+ memcpy(dso, dev->ds->ops, sizeof(*dso));
+ dso->phy_read = NULL;
+ dso->phy_write = NULL;
+ dev->ds->ops = dso;
+
dev->pdata = pdata;
platform_set_drvdata(pdev, dev);