[PATCH v3 12/13] net: phy: adjust qca8081 master/slave seed value if link down

Luo Jie
2021-10-18T03:34:57Z

1. The master/slave seed needs to be updated when the link can't
be created.

2. The case where two qca8081 PHYs are connected each other and
master/slave seed is generated as the same value also needs
to be considered, so adding this code change into read_status
instead of link_change_notify.

Signed-off-by: Luo Jie <luoj@codeaurora.org>
---
drivers/net/phy/at803x.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index 5d007f89e9d3..77aaf9e72781 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -1556,6 +1556,22 @@ static int qca808x_read_status(struct phy_device *phydev)
else
phydev->interface = PHY_INTERFACE_MODE_SMII;

+ /* generate seed as a lower random value to make PHY linked as SLAVE easily,
+ * except for master/slave configuration fault detected.
+ * the reason for not putting this code into the function link_change_notify is
+ * the corner case where the link partner is also the qca8081 PHY and the seed
+ * value is configured as the same value, the link can't be up and no link change
+ * occurs.
+ */
+ if (!phydev->link) {
+ if (phydev->master_slave_state == MASTER_SLAVE_STATE_ERR) {
+ qca808x_phy_ms_seed_enable(phydev, false);
+ } else {
+ qca808x_phy_ms_random_seed_set(phydev);
+ qca808x_phy_ms_seed_enable(phydev, true);
+ }
+ }
+
return 0;
}

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