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bcm53xx: add Tenda AC9 switch workaround

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This fixes regressed support for Tenda AC9 which got broken somewhere
between LEDE 17.01 and OpenWrt 18.06.

At some point bcm47xx_nvram_gpio_pin() started working on bcm53xx
devices and it resulted in swconfig b53 performing GPIO-based switch
reset. It exposed some bug as switch stopped working.

The problem is most likely to be some missing initialization step. Tenda
AC9 comes with BCM53125 rev 4 (pretty common chip) but apparently needs
some extra quirk.

As a workaround (it doesn't make much sense to debug swconfig driver
which has a working DSA replacement) simply avoid full switch reset.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki
2025-07-31 10:25:52 +02:00
parent 4a1d8ef55c
commit 78e4cffcd8
1 changed files with 39 additions and 0 deletions
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39
target/linux/bcm53xx/patches-5.4/701-b53-add-Tenda-AC9-switch-reset-workaround.patch Normal file
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@ -0,0 +1,39 @@
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Wed, 30 Jul 2025 12:37:12 +0000
Subject: [PATCH] b53: add Tenda AC9 switch reset workaround
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Avoid switch reset to keep it in a working state.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
drivers/net/phy/b53/b53_priv.h | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/net/phy/b53/b53_priv.h
+++ b/drivers/net/phy/b53/b53_priv.h
@@ -21,6 +21,7 @@
#include <linux/kernel.h>
#include <linux/mutex.h>
+#include <linux/of.h>
#include <linux/switch.h>
struct b53_device;
@@ -318,6 +319,14 @@ static inline int b53_write64(struct b53
static inline int b53_switch_get_reset_gpio(struct b53_device *dev)
{
+ /*
+ * Tenda AC9 comes with gpio2=robo_reset but performing switch reset
+ * leaves it in a non-working state. It seems b53 swconfig driver misses
+ * some initialization bit.
+ */
+ if (of_machine_is_compatible("tenda,ac9"))
+ return -ENOENT;
+
#ifdef CONFIG_BCM47XX
enum bcm47xx_board board = bcm47xx_board_get();