net: phy: Do not perform software reset for Generic PHY

commit 0878fff1f42c18e448ab5b8b4f6a3eb32365b5b6 upstream.

The Generic PHY driver is a catch-all PHY driver and it should preserve
whatever prior initialization has been done by boot loader or firmware
agents. For specific PHY device configuration it is expected that a
specialized PHY driver would take over that role.

Resetting the generic PHY was a bad idea that has lead to several
complaints and downstream workarounds e.g: in OpenWrt/LEDE so restore
the behavior prior to 87aa9f9c61ad ("net: phy: consolidate PHY
reset in phy_init_hw()").

Reported-by: Felix Fietkau <nbd@nbd.name>
Fixes: 87aa9f9c61ad ("net: phy: consolidate PHY reset in phy_init_hw()")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 32b555a..9e7b783 100644 (file)
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1792,7 +1792,7 @@ static struct phy_driver genphy_driver[] = {
        .phy_id         = 0xffffffff,
        .phy_id_mask    = 0xffffffff,
        .name           = "Generic PHY",
-       .soft_reset     = genphy_soft_reset,
+       .soft_reset     = genphy_no_soft_reset,
        .config_init    = genphy_config_init,
        .features       = PHY_GBIT_FEATURES | SUPPORTED_MII |
                          SUPPORTED_AUI | SUPPORTED_FIBRE |

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 6c9b1e0..8431c8c 100644 (file)
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -799,6 +799,10 @@ int genphy_read_status(struct phy_device *phydev);
 int genphy_suspend(struct phy_device *phydev);
 int genphy_resume(struct phy_device *phydev);
 int genphy_soft_reset(struct phy_device *phydev);
+static inline int genphy_no_soft_reset(struct phy_device *phydev)
+{
+       return 0;
+}
 void phy_driver_unregister(struct phy_driver *drv);
 void phy_drivers_unregister(struct phy_driver *drv, int n);
 int phy_driver_register(struct phy_driver *new_driver, struct module *owner);