[PATCH net-next 0/3] net: phy: soft reset rework for 10G PHYs

[PATCH net-next 0/3] net: phy: soft reset rework for 10G PHYs

[Florian Fainelli]

Hi David,

As reported by Shaohui, 10G PHYs may have a slightly more complex reset
sequence for which a BMCR_RESET software reset might not suffice. This
patchset offers a solution for those by allowing them to implement their
own soft_reset() callback. Finally there is an update to the PHY library
Documentation to cover for the newly added callbacks of the PHY driver
structure.

Thanks!

Florian Fainelli (3):
  net: phy: move PHY software reset to genphy_soft_reset
  net: phy: allow PHY drivers to implement their own software reset
  Documentation: networking: update phy.txt with recent changes

 Documentation/networking/phy.txt |  9 +++++++++
 drivers/net/phy/phy_device.c     | 39 ++++++++++++++++++++++++++++++++++-----
 include/linux/phy.h              |  6 ++++++
 3 files changed, 49 insertions(+), 5 deletions(-)

-- 
1.8.3.2

[PATCH net-next 1/3] net: phy: move PHY software reset to genphy_soft_reset

[Florian Fainelli]

As pointed out by Shaohui, this function is generic for 10/100/1000
PHYs, but 10G PHYs might have a slightly different reset sequence which
prevents most of them from using this function.

Move the BMCR_RESET based software resent sequence to
genphy_soft_reset() in preparation for allowing PHY drivers to implement
a soft_reset() callback.

Reported-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/net/phy/phy_device.c | 27 ++++++++++++++++++++++-----
 include/linux/phy.h          |  1 +
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index c2d778d..7c21b82 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -540,11 +540,7 @@ int phy_init_hw(struct phy_device *phydev)
 	if (!phydev->drv || !phydev->drv->config_init)
 		return 0;
 
-	ret = phy_write(phydev, MII_BMCR, BMCR_RESET);
-	if (ret < 0)
-		return ret;
-
-	ret = phy_poll_reset(phydev);
+	ret = genphy_soft_reset(phydev);
 	if (ret < 0)
 		return ret;
 
@@ -1045,6 +1041,27 @@ static int gen10g_read_status(struct phy_device *phydev)
 	return 0;
 }
 
+/**
+ * genphy_soft_reset - software reset the PHY via BMCR_RESET bit
+ * @phydev: target phy_device struct
+ *
+ * Description: Perform a software PHY reset using the standard
+ * BMCR_RESET bit and poll for the reset bit to be cleared.
+ *
+ * Returns: 0 on success, < 0 on failure
+ */
+int genphy_soft_reset(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = phy_write(phydev, MII_BMCR, BMCR_RESET);
+	if (ret < 0)
+		return ret;
+
+	return phy_poll_reset(phydev);
+}
+EXPORT_SYMBOL(genphy_soft_reset);
+
 static int genphy_config_init(struct phy_device *phydev)
 {
 	int val;
diff --git a/include/linux/phy.h b/include/linux/phy.h
index f7fe546..bffe0ec 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -666,6 +666,7 @@ int genphy_update_link(struct phy_device *phydev);
 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);
 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);
-- 
1.8.3.2

[PATCH net-next 2/3] net: phy: allow PHY drivers to implement their own software reset

[Florian Fainelli]

As pointed out by Shaohui, most 10G PHYs out there have a non-standard
compliant software reset sequence, eventually something much more
complex than just toggling the BMCR_RESET bit. Allow PHY driver to
implement their own soft_reset() callback to deal with that. If no
callback is provided, call into genphy_soft_reset() which makes sure the
existing behavior is kept intact.

Reported-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/net/phy/phy_device.c | 16 ++++++++++++++--
 include/linux/phy.h          |  5 +++++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 7c21b82..e6bbe1b 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -535,12 +535,16 @@ static int phy_poll_reset(struct phy_device *phydev)
 
 int phy_init_hw(struct phy_device *phydev)
 {
-	int ret;
+	int ret = 0;
 
 	if (!phydev->drv || !phydev->drv->config_init)
 		return 0;
 
-	ret = genphy_soft_reset(phydev);
+	if (phydev->drv->soft_reset(phydev))
+		ret = phydev->drv->soft_reset(phydev);
+	else
+		ret = genphy_soft_reset(phydev);
+
 	if (ret < 0)
 		return ret;
 
@@ -1108,6 +1112,12 @@ static int genphy_config_init(struct phy_device *phydev)
 	return 0;
 }
 
+static int gen10g_soft_reset(struct phy_device *phydev)
+{
+	/* Do nothing for now */
+	return 0;
+}
+
 static int gen10g_config_init(struct phy_device *phydev)
 {
 	/* Temporarily just say we support everything */
@@ -1282,6 +1292,7 @@ static struct phy_driver genphy_driver[] = {
 	.phy_id		= 0xffffffff,
 	.phy_id_mask	= 0xffffffff,
 	.name		= "Generic PHY",
+	.soft_reset	= genphy_soft_reset,
 	.config_init	= genphy_config_init,
 	.features	= 0,
 	.config_aneg	= genphy_config_aneg,
@@ -1294,6 +1305,7 @@ static struct phy_driver genphy_driver[] = {
 	.phy_id         = 0xffffffff,
 	.phy_id_mask    = 0xffffffff,
 	.name           = "Generic 10G PHY",
+	.soft_reset	= gen10g_soft_reset,
 	.config_init    = gen10g_config_init,
 	.features       = 0,
 	.config_aneg    = gen10g_config_aneg,
diff --git a/include/linux/phy.h b/include/linux/phy.h
index bffe0ec..24126c4 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -440,6 +440,11 @@ struct phy_driver {
 	u32 flags;
 
 	/*
+	 * Called to issue a PHY software reset
+	 */
+	int (*soft_reset)(struct phy_device *phydev);
+
+	/*
 	 * Called to initialize the PHY,
 	 * including after a reset
 	 */
-- 
1.8.3.2

[PATCH net-next 3/3] Documentation: networking: update phy.txt with recent changes

[Florian Fainelli]

The PHY library was missing a bunch of newly added PHY driver callbacks
along with a smallish description of what they do, fix that.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 Documentation/networking/phy.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/networking/phy.txt b/Documentation/networking/phy.txt
index ebf2707..88b9336 100644
--- a/Documentation/networking/phy.txt
+++ b/Documentation/networking/phy.txt
@@ -253,16 +253,25 @@ Writing a PHY driver
 
  Each driver consists of a number of function pointers:
 
+   soft_reset: performa s PHY software reset
    config_init: configures PHY into a sane state after a reset.
      For instance, a Davicom PHY requires descrambling disabled.
    probe: Allocate phy->priv, optionally refuse to bind.
    PHY may not have been reset or had fixups run yet.
    suspend/resume: power management
    config_aneg: Changes the speed/duplex/negotiation settings
+   aneg_done: Determines the auto-negotiation result
    read_status: Reads the current speed/duplex/negotiation settings
    ack_interrupt: Clear a pending interrupt
+   did_interrupt: Checks if the PHY generated an interrupt
    config_intr: Enable or disable interrupts
    remove: Does any driver take-down
+   ts_info: Queries about the HW timestamping status
+   hwtstamp: Set the PHY HW timestamping configuration
+   rxtstamp: Requests a receive timestamp at the PHY level for a 'skb'
+   txtsamp: Requests a transmit timestamp at the PHY level for a 'skb'
+   set_wol: Enable Wake-on-LAN at the PHY level
+   get_wol: Get the Wake-on-LAN status at the PHY level
 
  Of these, only config_aneg and read_status are required to be
  assigned by the driver code.  The rest are optional.  Also, it is
-- 
1.8.3.2

Re: [PATCH net-next 2/3] net: phy: allow PHY drivers to implement their own software reset

[David Miller]

From: Florian Fainelli <f.fainelli@gmail.com>
Date: Mon, 17 Feb 2014 12:52:45 -0800

> +	if (phydev->drv->soft_reset(phydev))
> +		ret = phydev->drv->soft_reset(phydev);

You're not testing if the method is NULL, you're actually invoking it.

Re: [PATCH net-next 2/3] net: phy: allow PHY drivers to implement their own software reset

[Florian Fainelli]

2014-02-17 13:23 GMT-08:00 David Miller <davem@davemloft.net>:
> From: Florian Fainelli <f.fainelli@gmail.com>
> Date: Mon, 17 Feb 2014 12:52:45 -0800
>
>> +     if (phydev->drv->soft_reset(phydev))
>> +             ret = phydev->drv->soft_reset(phydev);
>
> You're not testing if the method is NULL, you're actually invoking it.

That, and there was a typo in the Documentation patch, all fixed now, thanks!
-- 
Florian