Since the driver works in the "legacy" addressing mode, we need to write
to the expansion register (0x17) with bits 11:8 set to 0xf to properly
select the expansion register passed as argument.

Fixes: f68d08c437f9 ("net: phy: bcm7xxx: Add EPHY entry for 72165")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/net/phy/bcm-phy-lib.h | 5 +++++
 drivers/net/phy/bcm7xxx.c     | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/bcm-phy-lib.h b/drivers/net/phy/bcm-phy-lib.h
index 9902fb182099..729db441797a 100644
--- a/drivers/net/phy/bcm-phy-lib.h
+++ b/drivers/net/phy/bcm-phy-lib.h
@@ -40,6 +40,11 @@ static inline int bcm_phy_write_exp_sel(struct phy_device *phydev,
 	return bcm_phy_write_exp(phydev, reg | MII_BCM54XX_EXP_SEL_ER, val);
 }
 
+static inline int bcm_phy_read_exp_sel(struct phy_device *phydev, u16 reg)
+{
+	return bcm_phy_read_exp(phydev, reg | MII_BCM54XX_EXP_SEL_ER);
+}
+
 int bcm54xx_auxctl_write(struct phy_device *phydev, u16 regnum, u16 val);
 int bcm54xx_auxctl_read(struct phy_device *phydev, u16 regnum);
 
diff --git a/drivers/net/phy/bcm7xxx.c b/drivers/net/phy/bcm7xxx.c
index 06be71ecd2f8..f8c17a253f8b 100644
--- a/drivers/net/phy/bcm7xxx.c
+++ b/drivers/net/phy/bcm7xxx.c
@@ -486,7 +486,7 @@ static int bcm7xxx_16nm_ephy_afe_config(struct phy_device *phydev)
 	bcm_phy_write_misc(phydev, 0x0038, 0x0002, 0xede0);
 
 	/* Read CORE_EXPA9 */
-	tmp = bcm_phy_read_exp(phydev, 0x00a9);
+	tmp = bcm_phy_read_exp_sel(phydev, 0x00a9);
 	/* CORE_EXPA9[6:1] is rcalcode[5:0] */
 	rcalcode = (tmp & 0x7e) / 2;
 	/* Correct RCAL code + 1 is -1% rprogr, LP: +16 */
-- 
2.34.1

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Mon,  8 May 2023 16:17:49 -0700 you wrote:
> Since the driver works in the "legacy" addressing mode, we need to write
> to the expansion register (0x17) with bits 11:8 set to 0xf to properly
> select the expansion register passed as argument.
> 
> Fixes: f68d08c437f9 ("net: phy: bcm7xxx: Add EPHY entry for 72165")
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> 
> [...]

Here is the summary with links:
  - [net] net: phy: bcm7xx: Correct read from expansion register
    https://git.kernel.org/netdev/net/c/582dbb2cc1a0

You are awesome, thank you!
-- 
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On Mon, May 08, 2023 at 04:17:49PM -0700, Florian Fainelli wrote:
> Since the driver works in the "legacy" addressing mode, we need to write
> to the expansion register (0x17) with bits 11:8 set to 0xf to properly
> select the expansion register passed as argument.
> 
> Fixes: f68d08c437f9 ("net: phy: bcm7xxx: Add EPHY entry for 72165")
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Reviewed-by: Simon Horman <simon.horman@corigine.com>