diff options
Diffstat (limited to 'target/linux/generic/backport-5.10/735-v5.14-17-net-dsa-qca8k-clear-MASTER_EN-after-phy-read-write.patch')
| -rw-r--r-- | target/linux/generic/backport-5.10/735-v5.14-17-net-dsa-qca8k-clear-MASTER_EN-after-phy-read-write.patch | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.10/735-v5.14-17-net-dsa-qca8k-clear-MASTER_EN-after-phy-read-write.patch b/target/linux/generic/backport-5.10/735-v5.14-17-net-dsa-qca8k-clear-MASTER_EN-after-phy-read-write.patch new file mode 100644 index 0000000000..4593da032b --- /dev/null +++ b/target/linux/generic/backport-5.10/735-v5.14-17-net-dsa-qca8k-clear-MASTER_EN-after-phy-read-write.patch @@ -0,0 +1,50 @@ +From 63c33bbfeb6842a956a0eb12901e28eb335bdb18 Mon Sep 17 00:00:00 2001 +From: Ansuel Smith <ansuelsmth@gmail.com> +Date: Fri, 14 May 2021 23:00:07 +0200 +Subject: [PATCH] net: dsa: qca8k: clear MASTER_EN after phy read/write + +Clear MDIO_MASTER_EN bit from MDIO_MASTER_CTRL after read/write +operation. The MDIO_MASTER_EN bit is not reset after read/write +operation and the next operation can be wrongly interpreted by the +switch as a mdio operation. This cause a production of wrong/garbage +data from the switch and underfined bheavior. (random port drop, +unplugged port flagged with link up, wrong port speed) +Also on driver remove the MASTER_CTRL can be left set and cause the +malfunction of any next driver using the mdio device. + +Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + drivers/net/dsa/qca8k.c | 14 ++++++++++++-- + 1 file changed, 12 insertions(+), 2 deletions(-) + +--- a/drivers/net/dsa/qca8k.c ++++ b/drivers/net/dsa/qca8k.c +@@ -649,8 +649,14 @@ qca8k_mdio_write(struct qca8k_priv *priv + if (ret) + return ret; + +- return qca8k_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL, +- QCA8K_MDIO_MASTER_BUSY); ++ ret = qca8k_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL, ++ QCA8K_MDIO_MASTER_BUSY); ++ ++ /* even if the busy_wait timeouts try to clear the MASTER_EN */ ++ qca8k_reg_clear(priv, QCA8K_MDIO_MASTER_CTRL, ++ QCA8K_MDIO_MASTER_EN); ++ ++ return ret; + } + + static int +@@ -685,6 +691,10 @@ qca8k_mdio_read(struct qca8k_priv *priv, + + val &= QCA8K_MDIO_MASTER_DATA_MASK; + ++ /* even if the busy_wait timeouts try to clear the MASTER_EN */ ++ qca8k_reg_clear(priv, QCA8K_MDIO_MASTER_CTRL, ++ QCA8K_MDIO_MASTER_EN); ++ + return val; + } + |