[for-3.18,08/15] net: phy: Do not perform software reset for Generic PHY

Message ID 1501015526-32178-9-git-send-email-amit.pundir@linaro.org
State New
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  • Stable candidates for 3.18.y
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Commit Message

Amit Pundir July 25, 2017, 8:45 p.m.
From: Florian Fainelli <f.fainelli@gmail.com>

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>

 drivers/net/phy/phy_device.c | 2 +-
 include/linux/phy.h          | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)



diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 70a0d88de654..9f8e10a240db 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1341,7 +1341,7 @@  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,
diff --git a/include/linux/phy.h b/include/linux/phy.h
index d090cfcaa167..fbdacd1278e3 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -737,6 +737,10 @@  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);