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Message-Id: <20170804231557.173779137@linuxfoundation.org>
Date: Fri, 4 Aug 2017 16:15:20 -0700
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Felix Fietkau <nbd@....name>,
Florian Fainelli <f.fainelli@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Amit Pundir <amit.pundir@...aro.org>
Subject: [PATCH 4.4 24/91] net: phy: Do not perform software reset for Generic PHY
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Florian Fainelli <f.fainelli@...il.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@....name>
Fixes: 87aa9f9c61ad ("net: phy: consolidate PHY reset in phy_init_hw()")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/net/phy/phy_device.c | 2 +-
include/linux/phy.h | 4 ++++
2 files changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1442,7 +1442,7 @@ 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 |
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -785,6 +785,10 @@ int genphy_read_status(struct phy_device
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);
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