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Merge branch 'phy-micrel-toggling-reset'

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Yoshihiro Shimoda says:

====================
net: phy: micrel: add toggling phy reset

This patch set is for R-Car Gen3 Salvator-XS boards. If we do
the following method, the phy cannot link up correctly.

 1) Kernel boots by using initramfs.
 --> No open the nic, so phy_device_register() and phy_probe()
     deasserts the reset.
 2) Kernel enters the suspend.
 --> So, keep the reset signal as deassert.
 --> On R-Car Salvator-XS board, unfortunately, the board power is
     turned off.
 3) Kernel returns from suspend.
 4) ifconfig eth0 up
 --> Then, since edge signal of the reset doesn't happen,
     it cannot link up.
 5) ifconfig eth0 down
 6) ifconfig eth0 up
 --> In this case, it can link up.

When resolving this issue after I got feedback from Andrew and Heiner,
I found an issue that the phy_device.c didn't call phy_resume()
if the PHY was not attached. So, patch 1 fixes it and add toggling
the phy reset to the micrel phy driver.

Changes from v1 (as RFC):
 - No remove the current code of phy_device.c to avoid any side effects.
 - Fix the mdio_bus_phy_resume() in phy_device.c.
 - Add toggling the phy reset in micrel.c if the PHY is not attached.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-12-03 15:20:19 -08:00
commit 4763c9f926
2 changed files with 14 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/phy/micrel.c
View File

@ -23,6 +23,7 @@
* ksz9477 * ksz9477
*/ */
#include <linux/delay.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/phy.h> #include <linux/phy.h>
@ -835,6 +836,13 @@ static int kszphy_resume(struct phy_device *phydev)
{ {
int ret; int ret;
if (!phydev->attached_dev) {
/* If the PHY is not attached, toggle the reset */
phy_device_reset(phydev, 1);
udelay(1);
phy_device_reset(phydev, 0);
}
genphy_resume(phydev); genphy_resume(phydev);
ret = kszphy_config_reset(phydev); ret = kszphy_config_reset(phydev);

11
drivers/net/phy/phy_device.c
View File

@ -220,7 +220,7 @@ static LIST_HEAD(phy_fixup_list);
static DEFINE_MUTEX(phy_fixup_lock); static DEFINE_MUTEX(phy_fixup_lock);
#ifdef CONFIG_PM #ifdef CONFIG_PM
static bool mdio_bus_phy_may_suspend(struct phy_device *phydev) static bool mdio_bus_phy_may_suspend(struct phy_device *phydev, bool suspend)
{ {
struct device_driver *drv = phydev->mdio.dev.driver; struct device_driver *drv = phydev->mdio.dev.driver;
struct phy_driver *phydrv = to_phy_driver(drv); struct phy_driver *phydrv = to_phy_driver(drv);
@ -232,10 +232,11 @@ static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
/* PHY not attached? May suspend if the PHY has not already been /* PHY not attached? May suspend if the PHY has not already been
* suspended as part of a prior call to phy_disconnect() -> * suspended as part of a prior call to phy_disconnect() ->
* phy_detach() -> phy_suspend() because the parent netdev might be the * phy_detach() -> phy_suspend() because the parent netdev might be the
* MDIO bus driver and clock gated at this point. * MDIO bus driver and clock gated at this point. Also may resume if
* PHY is not attached.
*/ */
if (!netdev) if (!netdev)
return !phydev->suspended; return suspend ? !phydev->suspended : phydev->suspended;
if (netdev->wol_enabled) if (netdev->wol_enabled)
return false; return false;
@ -270,7 +271,7 @@ static int mdio_bus_phy_suspend(struct device *dev)
if (phydev->attached_dev && phydev->adjust_link) if (phydev->attached_dev && phydev->adjust_link)
phy_stop_machine(phydev); phy_stop_machine(phydev);
if (!mdio_bus_phy_may_suspend(phydev)) if (!mdio_bus_phy_may_suspend(phydev, true))
return 0; return 0;
return phy_suspend(phydev); return phy_suspend(phydev);
@ -281,7 +282,7 @@ static int mdio_bus_phy_resume(struct device *dev)
struct phy_device *phydev = to_phy_device(dev); struct phy_device *phydev = to_phy_device(dev);
int ret; int ret;
if (!mdio_bus_phy_may_suspend(phydev)) if (!mdio_bus_phy_may_suspend(phydev, false))
goto no_resume; goto no_resume;
ret = phy_resume(phydev); ret = phy_resume(phydev);