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kernel: 5.10: backport explicit MAC06 disable patch 

Backport of Ansuel Smith's "net: dsa: qca8k: make sure PAD0 MAC06
exchange is disabled", to ensure mac06 is disabled even if enabled by
the bootloader.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Signed-off-by: Matthew Hagan <mnhagan88@gmail.com>
This commit is contained in:
Matthew Hagan 2021-11-06 14:05:30 +00:00 committed by Hauke Mehrtens
parent 59c2a585a1
commit c9536520bd
1 changed files with 47 additions and 0 deletions
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47
target/linux/generic/backport-5.10/750-v5.16-net-dsa-qca8k-make-sure-pad0-mac06-exchange-is-disabled.patch Normal file
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@ -0,0 +1,47 @@
From 5f15d392dcb4aa250a63d6f2c5adfc26c0aedc78 Mon Sep 17 00:00:00 2001
From: Ansuel Smith <ansuelsmth@gmail.com>
Date: Tue, 2 Nov 2021 19:30:41 +0100
Subject: net: dsa: qca8k: make sure PAD0 MAC06 exchange is disabled
Some device set MAC06 exchange in the bootloader. This cause some
problem as we don't support this strange mode and we just set the port6
as the primary CPU port. With MAC06 exchange, PAD0 reg configure port6
instead of port0. Add an extra check and explicitly disable MAC06 exchange
to correctly configure the port PAD config.
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Fixes: 3fcf734aa482 ("net: dsa: qca8k: add support for cpu port 6")
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/dsa/qca8k.c | 8 ++++++++
drivers/net/dsa/qca8k.h | 1 +
2 files changed, 9 insertions(+)
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -1109,6 +1109,14 @@ qca8k_setup(struct dsa_switch *ds)
if (ret)
return ret;
+ /* Make sure MAC06 is disabled */
+ ret = qca8k_reg_clear(priv, QCA8K_REG_PORT0_PAD_CTRL,
+ QCA8K_PORT0_PAD_MAC06_EXCHANGE_EN);
+ if (ret) {
+ dev_err(priv->dev, "failed disabling MAC06 exchange");
+ return ret;
+ }
+
/* Enable CPU Port */
ret = qca8k_reg_set(priv, QCA8K_REG_GLOBAL_FW_CTRL0,
QCA8K_GLOBAL_FW_CTRL0_CPU_PORT_EN);
--- a/drivers/net/dsa/qca8k.h
+++ b/drivers/net/dsa/qca8k.h
@@ -34,6 +34,7 @@
#define QCA8K_MASK_CTRL_DEVICE_ID_MASK GENMASK(15, 8)
#define QCA8K_MASK_CTRL_DEVICE_ID(x) ((x) >> 8)
#define QCA8K_REG_PORT0_PAD_CTRL 0x004
+#define QCA8K_PORT0_PAD_MAC06_EXCHANGE_EN BIT(31)
#define QCA8K_PORT0_PAD_SGMII_RXCLK_FALLING_EDGE BIT(19)
#define QCA8K_PORT0_PAD_SGMII_TXCLK_FALLING_EDGE BIT(18)
#define QCA8K_REG_PORT5_PAD_CTRL 0x008