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net: phy: broadcom: stub c45 read/write for 54810 

[ Upstream commit 096516d092 ]

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: b14995ac25 ("net: phy: broadcom: Add BCM54810 PHY entry")
Signed-off-by: Justin Chen <justin.chen@broadcom.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/1691901708-28650-1-git-send-email-justin.chen@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Justin Chen 2023-08-12 21:41:47 -07:00 committed by Greg Kroah-Hartman
parent 8e249f8ffe
commit 6095d0c396
1 changed files with 13 additions and 0 deletions
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13
drivers/net/phy/broadcom.c
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@ -486,6 +486,17 @@ static int bcm54xx_resume(struct phy_device *phydev)
return bcm54xx_config_init(phydev);
}
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 bcm54811_config_init(struct phy_device *phydev)
{
int err, reg;
@ -981,6 +992,8 @@ static struct phy_driver broadcom_drivers[] = {
.get_strings = bcm_phy_get_strings,
.get_stats = bcm54xx_get_stats,
.probe = bcm54xx_phy_probe,
.read_mmd = bcm54810_read_mmd,
.write_mmd = bcm54810_write_mmd,
.config_init = bcm54xx_config_init,
.config_aneg = bcm5481_config_aneg,
.config_intr = bcm_phy_config_intr,