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[PATCH net V3 3/3] net: phy: mxl-gpy: Remove interrupt mask clearing from config_init

Raju Lakkaraju posted 3 patches 1 year, 8 months ago
There is a newer version of this series
[PATCH net V3 3/3] net: phy: mxl-gpy: Remove interrupt mask clearing from config_init
Posted by Raju Lakkaraju 1 year, 8 months ago 
When the system resumes from sleep, the phy_init_hw() function invokes
config_init(), which clears all interrupt masks and causes wake events to be
lost in subsequent wake sequences. Remove interrupt mask clearing from
config_init() and preserve relevant masks in config_intr()

Fixes: 7d901a1e878a ("net: phy: add Maxlinear GPY115/21x/24x driver")
Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
---
Change List:                                                                    
------------                                                                    
V0 -> V3:
  - Address the https://lore.kernel.org/lkml/4a565d54-f468-4e32-8a2c-102c1203f72c@lunn.ch/T/
    review comments
  
 drivers/net/phy/mxl-gpy.c | 58 +++++++++++++++++++++++++--------------
 1 file changed, 38 insertions(+), 20 deletions(-)

diff --git a/drivers/net/phy/mxl-gpy.c b/drivers/net/phy/mxl-gpy.c
index b2d36a3a96f1..e5f8ac4b4604 100644
--- a/drivers/net/phy/mxl-gpy.c
+++ b/drivers/net/phy/mxl-gpy.c
@@ -107,6 +107,7 @@ struct gpy_priv {
 
 	u8 fw_major;
 	u8 fw_minor;
+	u32 wolopts;
 
 	/* It takes 3 seconds to fully switch out of loopback mode before
 	 * it can safely re-enter loopback mode. Record the time when
@@ -221,6 +222,15 @@ static int gpy_hwmon_register(struct phy_device *phydev)
 }
 #endif
 
+static int gpy_ack_interrupt(struct phy_device *phydev)
+{
+	int ret;
+
+	/* Clear all pending interrupts */
+	ret = phy_read(phydev, PHY_ISTAT);
+	return ret < 0 ? ret : 0;
+}
+
 static int gpy_mbox_read(struct phy_device *phydev, u32 addr)
 {
 	struct gpy_priv *priv = phydev->priv;
@@ -262,16 +272,8 @@ static int gpy_mbox_read(struct phy_device *phydev, u32 addr)
 
 static int gpy_config_init(struct phy_device *phydev)
 {
-	int ret;
-
-	/* Mask all interrupts */
-	ret = phy_write(phydev, PHY_IMASK, 0);
-	if (ret)
-		return ret;
-
-	/* Clear all pending interrupts */
-	ret = phy_read(phydev, PHY_ISTAT);
-	return ret < 0 ? ret : 0;
+	/* Nothing to configure. Configuration Requirement Placeholder */
+	return 0;
 }
 
 static int gpy21x_config_init(struct phy_device *phydev)
@@ -627,11 +629,23 @@ static int gpy_read_status(struct phy_device *phydev)
 
 static int gpy_config_intr(struct phy_device *phydev)
 {
+	struct gpy_priv *priv = phydev->priv;
 	u16 mask = 0;
+	int ret;
+
+	ret = gpy_ack_interrupt(phydev);
+	if (ret)
+		return ret;
 
 	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
 		mask = PHY_IMASK_MASK;
 
+	if (priv->wolopts & WAKE_MAGIC)
+		mask |= PHY_IMASK_WOL;
+
+	if (priv->wolopts & WAKE_PHY)
+		mask |= PHY_IMASK_LSTC;
+
 	return phy_write(phydev, PHY_IMASK, mask);
 }
 
@@ -678,6 +692,7 @@ static int gpy_set_wol(struct phy_device *phydev,
 		       struct ethtool_wolinfo *wol)
 {
 	struct net_device *attach_dev = phydev->attached_dev;
+	struct gpy_priv *priv = phydev->priv;
 	int ret;
 
 	if (wol->wolopts & WAKE_MAGIC) {
@@ -725,6 +740,8 @@ static int gpy_set_wol(struct phy_device *phydev,
 		ret = phy_read(phydev, PHY_ISTAT);
 		if (ret < 0)
 			return ret;
+
+		priv->wolopts |= WAKE_MAGIC;
 	} else {
 		/* Disable magic packet matching */
 		ret = phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2,
@@ -732,6 +749,13 @@ static int gpy_set_wol(struct phy_device *phydev,
 					 WOL_EN);
 		if (ret < 0)
 			return ret;
+
+		/* Disable the WOL interrupt */
+		ret = phy_clear_bits(phydev, PHY_IMASK, PHY_IMASK_WOL);
+		if (ret < 0)
+			return ret;
+
+		priv->wolopts &= ~WAKE_MAGIC;
 	}
 
 	if (wol->wolopts & WAKE_PHY) {
@@ -748,9 +772,11 @@ static int gpy_set_wol(struct phy_device *phydev,
 		if (ret & (PHY_IMASK_MASK & ~PHY_IMASK_LSTC))
 			phy_trigger_machine(phydev);
 
+		priv->wolopts |= WAKE_PHY;
 		return 0;
 	}
 
+	priv->wolopts &= ~WAKE_PHY;
 	/* Disable the link state change interrupt */
 	return phy_clear_bits(phydev, PHY_IMASK, PHY_IMASK_LSTC);
 }
@@ -758,18 +784,10 @@ static int gpy_set_wol(struct phy_device *phydev,
 static void gpy_get_wol(struct phy_device *phydev,
 			struct ethtool_wolinfo *wol)
 {
-	int ret;
+	struct gpy_priv *priv = phydev->priv;
 
 	wol->supported = WAKE_MAGIC | WAKE_PHY;
-	wol->wolopts = 0;
-
-	ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, VPSPEC2_WOL_CTL);
-	if (ret & WOL_EN)
-		wol->wolopts |= WAKE_MAGIC;
-
-	ret = phy_read(phydev, PHY_IMASK);
-	if (ret & PHY_IMASK_LSTC)
-		wol->wolopts |= WAKE_PHY;
+	wol->wolopts = priv->wolopts;
 }
 
 static int gpy_loopback(struct phy_device *phydev, bool enable)
-- 
2.34.1
Re: [PATCH net V3 3/3] net: phy: mxl-gpy: Remove interrupt mask clearing from config_init
Posted by Wojciech Drewek 1 year, 8 months ago 

On 05.06.2024 12:16, Raju Lakkaraju wrote:
> When the system resumes from sleep, the phy_init_hw() function invokes
> config_init(), which clears all interrupt masks and causes wake events to be
> lost in subsequent wake sequences. Remove interrupt mask clearing from
> config_init() and preserve relevant masks in config_intr()
> 
> Fixes: 7d901a1e878a ("net: phy: add Maxlinear GPY115/21x/24x driver")
> Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
> ---

One nit, other than that:
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>

> Change List:                                                                    
> ------------                                                                    
> V0 -> V3:
>   - Address the https://lore.kernel.org/lkml/4a565d54-f468-4e32-8a2c-102c1203f72c@lunn.ch/T/
>     review comments
>   
>  drivers/net/phy/mxl-gpy.c | 58 +++++++++++++++++++++++++--------------
>  1 file changed, 38 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/net/phy/mxl-gpy.c b/drivers/net/phy/mxl-gpy.c
> index b2d36a3a96f1..e5f8ac4b4604 100644
> --- a/drivers/net/phy/mxl-gpy.c
> +++ b/drivers/net/phy/mxl-gpy.c
> @@ -107,6 +107,7 @@ struct gpy_priv {
>  
>  	u8 fw_major;
>  	u8 fw_minor;
> +	u32 wolopts;
>  
>  	/* It takes 3 seconds to fully switch out of loopback mode before
>  	 * it can safely re-enter loopback mode. Record the time when
> @@ -221,6 +222,15 @@ static int gpy_hwmon_register(struct phy_device *phydev)
>  }
>  #endif
>  
> +static int gpy_ack_interrupt(struct phy_device *phydev)
> +{
> +	int ret;
> +
> +	/* Clear all pending interrupts */
> +	ret = phy_read(phydev, PHY_ISTAT);
> +	return ret < 0 ? ret : 0;

Can we just return phy_read?

> +}
> +
>  static int gpy_mbox_read(struct phy_device *phydev, u32 addr)
>  {
>  	struct gpy_priv *priv = phydev->priv;
> @@ -262,16 +272,8 @@ static int gpy_mbox_read(struct phy_device *phydev, u32 addr)
>  
>  static int gpy_config_init(struct phy_device *phydev)
>  {
> -	int ret;
> -
> -	/* Mask all interrupts */
> -	ret = phy_write(phydev, PHY_IMASK, 0);
> -	if (ret)
> -		return ret;
> -
> -	/* Clear all pending interrupts */
> -	ret = phy_read(phydev, PHY_ISTAT);
> -	return ret < 0 ? ret : 0;
> +	/* Nothing to configure. Configuration Requirement Placeholder */
> +	return 0;
>  }
>  
>  static int gpy21x_config_init(struct phy_device *phydev)
> @@ -627,11 +629,23 @@ static int gpy_read_status(struct phy_device *phydev)
>  
>  static int gpy_config_intr(struct phy_device *phydev)
>  {
> +	struct gpy_priv *priv = phydev->priv;
>  	u16 mask = 0;
> +	int ret;
> +
> +	ret = gpy_ack_interrupt(phydev);
> +	if (ret)
> +		return ret;
>  
>  	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
>  		mask = PHY_IMASK_MASK;
>  
> +	if (priv->wolopts & WAKE_MAGIC)
> +		mask |= PHY_IMASK_WOL;
> +
> +	if (priv->wolopts & WAKE_PHY)
> +		mask |= PHY_IMASK_LSTC;
> +
>  	return phy_write(phydev, PHY_IMASK, mask);
>  }
>  
> @@ -678,6 +692,7 @@ static int gpy_set_wol(struct phy_device *phydev,
>  		       struct ethtool_wolinfo *wol)
>  {
>  	struct net_device *attach_dev = phydev->attached_dev;
> +	struct gpy_priv *priv = phydev->priv;
>  	int ret;
>  
>  	if (wol->wolopts & WAKE_MAGIC) {
> @@ -725,6 +740,8 @@ static int gpy_set_wol(struct phy_device *phydev,
>  		ret = phy_read(phydev, PHY_ISTAT);
>  		if (ret < 0)
>  			return ret;
> +
> +		priv->wolopts |= WAKE_MAGIC;
>  	} else {
>  		/* Disable magic packet matching */
>  		ret = phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2,
> @@ -732,6 +749,13 @@ static int gpy_set_wol(struct phy_device *phydev,
>  					 WOL_EN);
>  		if (ret < 0)
>  			return ret;
> +
> +		/* Disable the WOL interrupt */
> +		ret = phy_clear_bits(phydev, PHY_IMASK, PHY_IMASK_WOL);
> +		if (ret < 0)
> +			return ret;
> +
> +		priv->wolopts &= ~WAKE_MAGIC;
>  	}
>  
>  	if (wol->wolopts & WAKE_PHY) {
> @@ -748,9 +772,11 @@ static int gpy_set_wol(struct phy_device *phydev,
>  		if (ret & (PHY_IMASK_MASK & ~PHY_IMASK_LSTC))
>  			phy_trigger_machine(phydev);
>  
> +		priv->wolopts |= WAKE_PHY;
>  		return 0;
>  	}
>  
> +	priv->wolopts &= ~WAKE_PHY;
>  	/* Disable the link state change interrupt */
>  	return phy_clear_bits(phydev, PHY_IMASK, PHY_IMASK_LSTC);
>  }
> @@ -758,18 +784,10 @@ static int gpy_set_wol(struct phy_device *phydev,
>  static void gpy_get_wol(struct phy_device *phydev,
>  			struct ethtool_wolinfo *wol)
>  {
> -	int ret;
> +	struct gpy_priv *priv = phydev->priv;
>  
>  	wol->supported = WAKE_MAGIC | WAKE_PHY;
> -	wol->wolopts = 0;
> -
> -	ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, VPSPEC2_WOL_CTL);
> -	if (ret & WOL_EN)
> -		wol->wolopts |= WAKE_MAGIC;
> -
> -	ret = phy_read(phydev, PHY_IMASK);
> -	if (ret & PHY_IMASK_LSTC)
> -		wol->wolopts |= WAKE_PHY;
> +	wol->wolopts = priv->wolopts;
>  }
>  
>  static int gpy_loopback(struct phy_device *phydev, bool enable)
Re: [PATCH net V3 3/3] net: phy: mxl-gpy: Remove interrupt mask clearing from config_init
Posted by Raju Lakkaraju 1 year, 8 months ago 
Hi Wojciech,

The 06/05/2024 13:24, Wojciech Drewek wrote:
> [Some people who received this message don't often get email from wojciech.drewek@intel.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> 
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On 05.06.2024 12:16, Raju Lakkaraju wrote:
> > When the system resumes from sleep, the phy_init_hw() function invokes
> > config_init(), which clears all interrupt masks and causes wake events to be
> > lost in subsequent wake sequences. Remove interrupt mask clearing from
> > config_init() and preserve relevant masks in config_intr()
> >
> > Fixes: 7d901a1e878a ("net: phy: add Maxlinear GPY115/21x/24x driver")
> > Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
> > ---
> 
> One nit, other than that:
> Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
> 
> > Change List:
> > ------------
> > V0 -> V3:
> >   - Address the https://lore.kernel.org/lkml/4a565d54-f468-4e32-8a2c-102c1203f72c@lunn.ch/T/
> >     review comments
> >
> >  drivers/net/phy/mxl-gpy.c | 58 +++++++++++++++++++++++++--------------
> >  1 file changed, 38 insertions(+), 20 deletions(-)
> >
> > diff --git a/drivers/net/phy/mxl-gpy.c b/drivers/net/phy/mxl-gpy.c
> > index b2d36a3a96f1..e5f8ac4b4604 100644
> > --- a/drivers/net/phy/mxl-gpy.c
> > +++ b/drivers/net/phy/mxl-gpy.c
> > @@ -107,6 +107,7 @@ struct gpy_priv {
> >
> >       u8 fw_major;
> >       u8 fw_minor;
> > +     u32 wolopts;
> >
> >       /* It takes 3 seconds to fully switch out of loopback mode before
> >        * it can safely re-enter loopback mode. Record the time when
> > @@ -221,6 +222,15 @@ static int gpy_hwmon_register(struct phy_device *phydev)
> >  }
> >  #endif
> >
> > +static int gpy_ack_interrupt(struct phy_device *phydev)
> > +{
> > +     int ret;
> > +
> > +     /* Clear all pending interrupts */
> > +     ret = phy_read(phydev, PHY_ISTAT);
> > +     return ret < 0 ? ret : 0;
> 
> Can we just return phy_read?
> 

No.
PHY_ISTAT (i.e.16 bit) is Max Linear's GPY211 PHY interrupt status register.
These bits are ROSC (i.e. "Read Only, Self-Clearing) bits.
Read Status gives us the interrupts details
Any negative number is indicate the error in accessing PHY registgers. 
Return either success (i.e. 0) or Error ( < 0)

> > +}
> > +
> >  static int gpy_mbox_read(struct phy_device *phydev, u32 addr)
> >  {
> >       struct gpy_priv *priv = phydev->priv;
> > @@ -262,16 +272,8 @@ static int gpy_mbox_read(struct phy_device *phydev, u32 addr)
> >

-- 
Thanks,                                                                         
Raju

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