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net: phy: realtek: fix RTL8211F interrupt mode 

After commit b94d22d94a "ARM64: dts: meson-gx: add external PHY
interrupt on some platforms" ethernet stopped working on my Odroid-C2
which has a RTL8211F phy.

It turned out that no interrupts were triggered. Further analysis
showed the register INER can't be altered on page 0.
Because register INSR needs to be accessed via page 0xa43 I assumed
that register INER needs to be accessed via some page too.
Some brute force check resulted in page 0xa42 being the right one.

With this patch the phy is working properly in interrupt mode.

Fixes: 3447cf2e9a ("net/phy: Add support for Realtek RTL8211F")
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Tested-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2017-11-12 16:16:04 +01:00 committed by David S. Miller
parent 0522bab1ab
commit 3697d058b0
1 changed files with 2 additions and 0 deletions
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2
drivers/net/phy/realtek.c
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@ -115,11 +115,13 @@ static int rtl8211f_config_intr(struct phy_device *phydev)
{
int err;
phy_write(phydev, RTL821x_PAGE_SELECT, 0xa42);
if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
err = phy_write(phydev, RTL821x_INER,
RTL8211F_INER_LINK_STATUS);
else
err = phy_write(phydev, RTL821x_INER, 0);
phy_write(phydev, RTL821x_PAGE_SELECT, 0);
return err;
}