4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Justin Chen <justin.chen@xxxxxxxxxxxx>
commit 096516d092d54604d590827d05b1022c8f326639 upstream.
The 54810 does not support c45. The mmd_phy_indirect accesses return
arbirtary values leading to odd behavior like saying it supports EEE
when it doesn't. We also see that reading/writing these non-existent
MMD registers leads to phy instability in some cases.
Fixes: b14995ac2527 ("net: phy: broadcom: Add BCM54810 PHY entry")
Signed-off-by: Justin Chen <justin.chen@xxxxxxxxxxxx>
Reviewed-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1691901708-28650-1-git-send-email-justin.chen@xxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
[florian: resolved conflicts in 4.19]
Signed-off-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/phy/broadcom.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
--- a/drivers/net/phy/broadcom.c
+++ b/drivers/net/phy/broadcom.c
@@ -421,6 +421,17 @@ static int bcm5482_read_status(struct ph
return err;
}
+static int bcm54810_read_mmd(struct phy_device *phydev, int devnum, u16 regnum)
+{
+ return -EOPNOTSUPP;
+}
+
+static int bcm54810_write_mmd(struct phy_device *phydev, int devnum, u16 regnum,
+ u16 val)
+{
+ return -EOPNOTSUPP;
+}
+
static int bcm5481_config_aneg(struct phy_device *phydev)
{
struct device_node *np = phydev->mdio.dev.of_node;
@@ -684,6 +695,8 @@ static struct phy_driver broadcom_driver
.name = "Broadcom BCM54810",
.features = PHY_GBIT_FEATURES,
.flags = PHY_HAS_INTERRUPT,
+ .read_mmd = bcm54810_read_mmd,
+ .write_mmd = bcm54810_write_mmd,
.config_init = bcm54xx_config_init,
.config_aneg = bcm5481_config_aneg,
.ack_interrupt = bcm_phy_ack_intr,
