[PATCH net-next v2 0/6] net: phy: mscc: various improvements to Microsemi PHY driver

[PATCH net-next v2 0/6] net: phy: mscc: various improvements to Microsemi PHY driver

[Quentin Schulz]

The Microsemi PHYs have multiple banks of registers (called pages).
Registers can only be accessed from one page, if we need a register from
another page, we need to switch the page and the registers of all other
pages are not accessible anymore.

Basically, to read register 5 from page 0, 1, 2, etc., you do the same
phy_read(phydev, 5); but you need to set the desired page beforehand.

In order to guarantee that two concurrent functions do not change the
page, we need to do some locking per page. This can be achieved with the
use of phy_select_page and phy_restore_page functions but phy_write/read
calls in-between those two functions shall be replaced by their
lock-free alternative __phy_write/read.

The Microsemi PHYs have several counters so let's make them available as PHY
statistics.

The VSC 8530/31/40/41 also need to update their EEE init sequence in order to
avoid packet losses and improve performance.

This patch series also makes some minor cosmetic changes to the driver.

Thanks,
Quentin

v2:
  - add patch to migrate MSCC driver to use phy_restore/select_page,
  - migrate all patches from v1 to use those two functions,
  - put the multiple lines of constants writes in an array and iterate over
  it to write the values,
  - add reviewed-bys,

Quentin Schulz (4):
  net: phy: mscc: migrate to phy_select/restore_page functions
  net: phy: mscc: remove unneeded parenthesis
  net: phy: mscc: shorten `x != 0` condition to `x`
  net: phy: mscc: remove unneeded temporary variable

Raju Lakkaraju (2):
  net: phy: mscc: add ethtool statistics counters
  net: phy: mscc: Add EEE init sequence

 drivers/net/phy/mscc.c | 360 ++++++++++++++++++++++++++++++++---------
 1 file changed, 282 insertions(+), 78 deletions(-)

-- 
2.17.1

[PATCH net-next v2 1/6] net: phy: mscc: migrate to phy_select/restore_page functions

[Quentin Schulz]

The Microsemi PHYs have multiple banks of registers (called pages).
Registers can only be accessed from one page, if we need a register from
another page, we need to switch the page and the registers of all other
pages are not accessible anymore.

Basically, to read register 5 from page 0, 1, 2, etc., you do the same
phy_read(phydev, 5); but you need to set the desired page beforehand.

In order to guarantee that two concurrent functions do not change the
page, we need to do some locking per page. This can be achieved with the
use of phy_select_page and phy_restore_page functions but phy_write/read
calls in-between those two functions shall be replaced by their
lock-free alternative __phy_write/read.

Let's migrate this driver to those functions.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
---
 drivers/net/phy/mscc.c | 142 +++++++++++++++++++++++------------------
 1 file changed, 79 insertions(+), 63 deletions(-)

diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c
index 7d0384e26c99..35d58e7b95e9 100644
--- a/drivers/net/phy/mscc.c
+++ b/drivers/net/phy/mscc.c
@@ -140,12 +140,14 @@ static const struct vsc8531_edge_rate_table edge_table[] = {
 };
 #endif /* CONFIG_OF_MDIO */
 
-static int vsc85xx_phy_page_set(struct phy_device *phydev, u16 page)
+static int vsc85xx_phy_read_page(struct phy_device *phydev)
 {
-	int rc;
+	return __phy_read(phydev, MSCC_EXT_PAGE_ACCESS);
+}
 
-	rc = phy_write(phydev, MSCC_EXT_PAGE_ACCESS, page);
-	return rc;
+static int vsc85xx_phy_write_page(struct phy_device *phydev, int page)
+{
+	return __phy_write(phydev, MSCC_EXT_PAGE_ACCESS, page);
 }
 
 static int vsc85xx_led_cntl_set(struct phy_device *phydev,
@@ -180,7 +182,7 @@ static int vsc85xx_mdix_get(struct phy_device *phydev, u8 *mdix)
 
 static int vsc85xx_mdix_set(struct phy_device *phydev, u8 mdix)
 {
-	int rc;
+	int rc, oldpage;
 	u16 reg_val;
 
 	reg_val = phy_read(phydev, MSCC_PHY_BYPASS_CONTROL);
@@ -197,25 +199,30 @@ static int vsc85xx_mdix_set(struct phy_device *phydev, u8 mdix)
 	if (rc != 0)
 		return rc;
 
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED);
-	if (rc != 0)
-		return rc;
+	oldpage = phy_select_page(phydev, MSCC_PHY_PAGE_EXTENDED);
+	if (oldpage < 0) {
+		rc = oldpage;
+		goto out;
+	}
 
-	reg_val = phy_read(phydev, MSCC_PHY_EXT_MODE_CNTL);
+	reg_val = __phy_read(phydev, MSCC_PHY_EXT_MODE_CNTL);
 	reg_val &= ~(FORCE_MDI_CROSSOVER_MASK);
 	if (mdix == ETH_TP_MDI)
 		reg_val |= FORCE_MDI_CROSSOVER_MDI;
 	else if (mdix == ETH_TP_MDI_X)
 		reg_val |= FORCE_MDI_CROSSOVER_MDIX;
-	rc = phy_write(phydev, MSCC_PHY_EXT_MODE_CNTL, reg_val);
+	rc = __phy_write(phydev, MSCC_PHY_EXT_MODE_CNTL, reg_val);
 	if (rc != 0)
-		return rc;
+		goto out;
 
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_STANDARD);
-	if (rc != 0)
+	rc = phy_restore_page(phydev, oldpage, rc);
+	if (rc < 0)
 		return rc;
 
 	return genphy_restart_aneg(phydev);
+
+out:
+	return phy_restore_page(phydev, oldpage, rc);
 }
 
 static int vsc85xx_downshift_get(struct phy_device *phydev, u8 *count)
@@ -223,25 +230,24 @@ static int vsc85xx_downshift_get(struct phy_device *phydev, u8 *count)
 	int rc;
 	u16 reg_val;
 
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED);
-	if (rc != 0)
+	rc = phy_select_page(phydev, MSCC_PHY_PAGE_EXTENDED);
+	if (rc < 0)
 		goto out;
 
-	reg_val = phy_read(phydev, MSCC_PHY_ACTIPHY_CNTL);
+	reg_val = __phy_read(phydev, MSCC_PHY_ACTIPHY_CNTL);
 	reg_val &= DOWNSHIFT_CNTL_MASK;
 	if (!(reg_val & DOWNSHIFT_EN))
 		*count = DOWNSHIFT_DEV_DISABLE;
 	else
 		*count = ((reg_val & ~DOWNSHIFT_EN) >> DOWNSHIFT_CNTL_POS) + 2;
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_STANDARD);
 
 out:
-	return rc;
+	return phy_restore_page(phydev, rc, rc > 0 ? 0 : rc);
 }
 
 static int vsc85xx_downshift_set(struct phy_device *phydev, u8 count)
 {
-	int rc;
+	int rc, oldpage;
 	u16 reg_val;
 
 	if (count == DOWNSHIFT_DEV_DEFAULT_COUNT) {
@@ -255,21 +261,19 @@ static int vsc85xx_downshift_set(struct phy_device *phydev, u8 count)
 		count = (((count - 2) << DOWNSHIFT_CNTL_POS) | DOWNSHIFT_EN);
 	}
 
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED);
-	if (rc != 0)
+	oldpage = phy_select_page(phydev, MSCC_PHY_PAGE_EXTENDED);
+	if (oldpage < 0) {
+		rc = oldpage;
 		goto out;
+	}
 
-	reg_val = phy_read(phydev, MSCC_PHY_ACTIPHY_CNTL);
+	reg_val = __phy_read(phydev, MSCC_PHY_ACTIPHY_CNTL);
 	reg_val &= ~(DOWNSHIFT_CNTL_MASK);
 	reg_val |= count;
-	rc = phy_write(phydev, MSCC_PHY_ACTIPHY_CNTL, reg_val);
-	if (rc != 0)
-		goto out;
-
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_STANDARD);
+	rc = __phy_write(phydev, MSCC_PHY_ACTIPHY_CNTL, reg_val);
 
 out:
-	return rc;
+	return phy_restore_page(phydev, oldpage, rc > 0 ? 0 : rc);
 }
 
 static int vsc85xx_wol_set(struct phy_device *phydev,
@@ -283,46 +287,48 @@ static int vsc85xx_wol_set(struct phy_device *phydev,
 	u8 *mac_addr = phydev->attached_dev->dev_addr;
 
 	mutex_lock(&phydev->lock);
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED_2);
-	if (rc != 0)
+	rc = phy_select_page(phydev, MSCC_PHY_PAGE_EXTENDED_2);
+	if (rc < 0) {
+		rc = phy_restore_page(phydev, rc, rc);
 		goto out_unlock;
+	}
 
 	if (wol->wolopts & WAKE_MAGIC) {
 		/* Store the device address for the magic packet */
 		for (i = 0; i < ARRAY_SIZE(pwd); i++)
 			pwd[i] = mac_addr[5 - (i * 2 + 1)] << 8 |
 				 mac_addr[5 - i * 2];
-		phy_write(phydev, MSCC_PHY_WOL_LOWER_MAC_ADDR, pwd[0]);
-		phy_write(phydev, MSCC_PHY_WOL_MID_MAC_ADDR, pwd[1]);
-		phy_write(phydev, MSCC_PHY_WOL_UPPER_MAC_ADDR, pwd[2]);
+		__phy_write(phydev, MSCC_PHY_WOL_LOWER_MAC_ADDR, pwd[0]);
+		__phy_write(phydev, MSCC_PHY_WOL_MID_MAC_ADDR, pwd[1]);
+		__phy_write(phydev, MSCC_PHY_WOL_UPPER_MAC_ADDR, pwd[2]);
 	} else {
-		phy_write(phydev, MSCC_PHY_WOL_LOWER_MAC_ADDR, 0);
-		phy_write(phydev, MSCC_PHY_WOL_MID_MAC_ADDR, 0);
-		phy_write(phydev, MSCC_PHY_WOL_UPPER_MAC_ADDR, 0);
+		__phy_write(phydev, MSCC_PHY_WOL_LOWER_MAC_ADDR, 0);
+		__phy_write(phydev, MSCC_PHY_WOL_MID_MAC_ADDR, 0);
+		__phy_write(phydev, MSCC_PHY_WOL_UPPER_MAC_ADDR, 0);
 	}
 
 	if (wol_conf->wolopts & WAKE_MAGICSECURE) {
 		for (i = 0; i < ARRAY_SIZE(pwd); i++)
 			pwd[i] = wol_conf->sopass[5 - (i * 2 + 1)] << 8 |
 				 wol_conf->sopass[5 - i * 2];
-		phy_write(phydev, MSCC_PHY_WOL_LOWER_PASSWD, pwd[0]);
-		phy_write(phydev, MSCC_PHY_WOL_MID_PASSWD, pwd[1]);
-		phy_write(phydev, MSCC_PHY_WOL_UPPER_PASSWD, pwd[2]);
+		__phy_write(phydev, MSCC_PHY_WOL_LOWER_PASSWD, pwd[0]);
+		__phy_write(phydev, MSCC_PHY_WOL_MID_PASSWD, pwd[1]);
+		__phy_write(phydev, MSCC_PHY_WOL_UPPER_PASSWD, pwd[2]);
 	} else {
-		phy_write(phydev, MSCC_PHY_WOL_LOWER_PASSWD, 0);
-		phy_write(phydev, MSCC_PHY_WOL_MID_PASSWD, 0);
-		phy_write(phydev, MSCC_PHY_WOL_UPPER_PASSWD, 0);
+		__phy_write(phydev, MSCC_PHY_WOL_LOWER_PASSWD, 0);
+		__phy_write(phydev, MSCC_PHY_WOL_MID_PASSWD, 0);
+		__phy_write(phydev, MSCC_PHY_WOL_UPPER_PASSWD, 0);
 	}
 
-	reg_val = phy_read(phydev, MSCC_PHY_WOL_MAC_CONTROL);
+	reg_val = __phy_read(phydev, MSCC_PHY_WOL_MAC_CONTROL);
 	if (wol_conf->wolopts & WAKE_MAGICSECURE)
 		reg_val |= SECURE_ON_ENABLE;
 	else
 		reg_val &= ~SECURE_ON_ENABLE;
-	phy_write(phydev, MSCC_PHY_WOL_MAC_CONTROL, reg_val);
+	__phy_write(phydev, MSCC_PHY_WOL_MAC_CONTROL, reg_val);
 
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_STANDARD);
-	if (rc != 0)
+	rc = phy_restore_page(phydev, rc, rc > 0 ? 0 : rc);
+	if (rc < 0)
 		goto out_unlock;
 
 	if (wol->wolopts & WAKE_MAGIC) {
@@ -359,17 +365,17 @@ static void vsc85xx_wol_get(struct phy_device *phydev,
 	struct ethtool_wolinfo *wol_conf = wol;
 
 	mutex_lock(&phydev->lock);
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED_2);
-	if (rc != 0)
+	rc = phy_select_page(phydev, MSCC_PHY_PAGE_EXTENDED_2);
+	if (rc < 0)
 		goto out_unlock;
 
-	reg_val = phy_read(phydev, MSCC_PHY_WOL_MAC_CONTROL);
+	reg_val = __phy_read(phydev, MSCC_PHY_WOL_MAC_CONTROL);
 	if (reg_val & SECURE_ON_ENABLE)
 		wol_conf->wolopts |= WAKE_MAGICSECURE;
 	if (wol_conf->wolopts & WAKE_MAGICSECURE) {
-		pwd[0] = phy_read(phydev, MSCC_PHY_WOL_LOWER_PASSWD);
-		pwd[1] = phy_read(phydev, MSCC_PHY_WOL_MID_PASSWD);
-		pwd[2] = phy_read(phydev, MSCC_PHY_WOL_UPPER_PASSWD);
+		pwd[0] = __phy_read(phydev, MSCC_PHY_WOL_LOWER_PASSWD);
+		pwd[1] = __phy_read(phydev, MSCC_PHY_WOL_MID_PASSWD);
+		pwd[2] = __phy_read(phydev, MSCC_PHY_WOL_UPPER_PASSWD);
 		for (i = 0; i < ARRAY_SIZE(pwd); i++) {
 			wol_conf->sopass[5 - i * 2] = pwd[i] & 0x00ff;
 			wol_conf->sopass[5 - (i * 2 + 1)] = (pwd[i] & 0xff00)
@@ -377,9 +383,8 @@ static void vsc85xx_wol_get(struct phy_device *phydev,
 		}
 	}
 
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_STANDARD);
-
 out_unlock:
+	phy_restore_page(phydev, rc, rc > 0 ? 0 : rc);
 	mutex_unlock(&phydev->lock);
 }
 
@@ -473,22 +478,25 @@ static int vsc85xx_dt_led_modes_get(struct phy_device *phydev,
 
 static int vsc85xx_edge_rate_cntl_set(struct phy_device *phydev, u8 edge_rate)
 {
-	int rc;
+	int rc, oldpage;
 	u16 reg_val;
 
 	mutex_lock(&phydev->lock);
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED_2);
-	if (rc != 0)
+	oldpage = phy_select_page(phydev, MSCC_PHY_PAGE_EXTENDED_2);
+	if (oldpage < 0) {
+		rc = oldpage;
 		goto out_unlock;
-	reg_val = phy_read(phydev, MSCC_PHY_WOL_MAC_CONTROL);
+	}
+
+	reg_val = __phy_read(phydev, MSCC_PHY_WOL_MAC_CONTROL);
 	reg_val &= ~(EDGE_RATE_CNTL_MASK);
 	reg_val |= (edge_rate << EDGE_RATE_CNTL_POS);
-	rc = phy_write(phydev, MSCC_PHY_WOL_MAC_CONTROL, reg_val);
+	rc = __phy_write(phydev, MSCC_PHY_WOL_MAC_CONTROL, reg_val);
 	if (rc != 0)
 		goto out_unlock;
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_STANDARD);
 
 out_unlock:
+	rc = phy_restore_page(phydev, oldpage, rc > 0 ? 0 : rc);
 	mutex_unlock(&phydev->lock);
 
 	return rc;
@@ -537,17 +545,17 @@ static int vsc85xx_default_config(struct phy_device *phydev)
 
 	phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
 	mutex_lock(&phydev->lock);
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED_2);
-	if (rc != 0)
+	rc = phy_select_page(phydev, MSCC_PHY_PAGE_EXTENDED_2);
+	if (rc < 0)
 		goto out_unlock;
 
 	reg_val = phy_read(phydev, MSCC_PHY_RGMII_CNTL);
 	reg_val &= ~(RGMII_RX_CLK_DELAY_MASK);
 	reg_val |= (RGMII_RX_CLK_DELAY_1_1_NS << RGMII_RX_CLK_DELAY_POS);
 	phy_write(phydev, MSCC_PHY_RGMII_CNTL, reg_val);
-	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_STANDARD);
 
 out_unlock:
+	rc = phy_restore_page(phydev, rc, rc > 0 ? 0 : rc);
 	mutex_unlock(&phydev->lock);
 
 	return rc;
@@ -699,6 +707,8 @@ static struct phy_driver vsc85xx_driver[] = {
 	.get_wol	= &vsc85xx_wol_get,
 	.get_tunable	= &vsc85xx_get_tunable,
 	.set_tunable	= &vsc85xx_set_tunable,
+	.read_page	= &vsc85xx_phy_read_page,
+	.write_page	= &vsc85xx_phy_write_page,
 },
 {
 	.phy_id		= PHY_ID_VSC8531,
@@ -720,6 +730,8 @@ static struct phy_driver vsc85xx_driver[] = {
 	.get_wol	= &vsc85xx_wol_get,
 	.get_tunable	= &vsc85xx_get_tunable,
 	.set_tunable	= &vsc85xx_set_tunable,
+	.read_page	= &vsc85xx_phy_read_page,
+	.write_page	= &vsc85xx_phy_write_page,
 },
 {
 	.phy_id		= PHY_ID_VSC8540,
@@ -741,6 +753,8 @@ static struct phy_driver vsc85xx_driver[] = {
 	.get_wol	= &vsc85xx_wol_get,
 	.get_tunable	= &vsc85xx_get_tunable,
 	.set_tunable	= &vsc85xx_set_tunable,
+	.read_page	= &vsc85xx_phy_read_page,
+	.write_page	= &vsc85xx_phy_write_page,
 },
 {
 	.phy_id		= PHY_ID_VSC8541,
@@ -762,6 +776,8 @@ static struct phy_driver vsc85xx_driver[] = {
 	.get_wol	= &vsc85xx_wol_get,
 	.get_tunable	= &vsc85xx_get_tunable,
 	.set_tunable	= &vsc85xx_set_tunable,
+	.read_page	= &vsc85xx_phy_read_page,
+	.write_page	= &vsc85xx_phy_write_page,
 }
 
 };
-- 
2.17.1

Re: [PATCH net-next v2 1/6] net: phy: mscc: migrate to phy_select/restore_page functions

[Andrew Lunn]

On Thu, Oct 04, 2018 at 02:47:23PM +0200, Quentin Schulz wrote:
> @@ -197,25 +199,30 @@ static int vsc85xx_mdix_set(struct phy_device *phydev, u8 mdix)
>  	if (rc != 0)
>  		return rc;
>  
> -	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED);
> -	if (rc != 0)
> -		return rc;
> +	oldpage = phy_select_page(phydev, MSCC_PHY_PAGE_EXTENDED);
> +	if (oldpage < 0) {
> +		rc = oldpage;
> +		goto out;
> +	}
>  
> -	reg_val = phy_read(phydev, MSCC_PHY_EXT_MODE_CNTL);
> +	reg_val = __phy_read(phydev, MSCC_PHY_EXT_MODE_CNTL);
>  	reg_val &= ~(FORCE_MDI_CROSSOVER_MASK);
>  	if (mdix == ETH_TP_MDI)
>  		reg_val |= FORCE_MDI_CROSSOVER_MDI;
>  	else if (mdix == ETH_TP_MDI_X)
>  		reg_val |= FORCE_MDI_CROSSOVER_MDIX;

Hi Quentin

Could you use phy_modify_paged() here? This function only accesses a
single register, so using the wrapper should not have any
disadvantages. The same should apply for any function modifying a single
register.

> -	rc = phy_write(phydev, MSCC_PHY_EXT_MODE_CNTL, reg_val);
> +	rc = __phy_write(phydev, MSCC_PHY_EXT_MODE_CNTL, reg_val);
>  	if (rc != 0)
> -		return rc;
> +		goto out;
>  
> -	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_STANDARD);
> -	if (rc != 0)
> +	rc = phy_restore_page(phydev, oldpage, rc);
> +	if (rc < 0)
>  		return rc;
>  
>  	return genphy_restart_aneg(phydev);
> +
> +out:
> +	return phy_restore_page(phydev, oldpage, rc);
>  }
>  
>  static int vsc85xx_downshift_get(struct phy_device *phydev, u8 *count)
> @@ -223,25 +230,24 @@ static int vsc85xx_downshift_get(struct phy_device *phydev, u8 *count)
>  	int rc;
>  	u16 reg_val;
>  
> -	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED);
> -	if (rc != 0)
> +	rc = phy_select_page(phydev, MSCC_PHY_PAGE_EXTENDED);
> +	if (rc < 0)
>  		goto out;
>  
> -	reg_val = phy_read(phydev, MSCC_PHY_ACTIPHY_CNTL);
> +	reg_val = __phy_read(phydev, MSCC_PHY_ACTIPHY_CNTL);
>  	reg_val &= DOWNSHIFT_CNTL_MASK;
>  	if (!(reg_val & DOWNSHIFT_EN))
>  		*count = DOWNSHIFT_DEV_DISABLE;
>  	else
>  		*count = ((reg_val & ~DOWNSHIFT_EN) >> DOWNSHIFT_CNTL_POS) + 2;

phy_read_paged()? Any function which just accesses a single register
should try to use phy_read_paged(), phy_write_paged() or
phy_modify_paged() to avoid a lot of boilerplate code.

	   Andrew

Re: [PATCH net-next v2 1/6] net: phy: mscc: migrate to phy_select/restore_page functions

[Quentin Schulz]

[-- Attachment #1: Type: text/plain, Size: 1144 bytes --]

Hi Andrew,

On Thu, Oct 04, 2018 at 05:16:30PM +0200, Andrew Lunn wrote:
> On Thu, Oct 04, 2018 at 02:47:23PM +0200, Quentin Schulz wrote:
> > @@ -197,25 +199,30 @@ static int vsc85xx_mdix_set(struct phy_device *phydev, u8 mdix)
> >  	if (rc != 0)
> >  		return rc;
> >  
> > -	rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED);
> > -	if (rc != 0)
> > -		return rc;
> > +	oldpage = phy_select_page(phydev, MSCC_PHY_PAGE_EXTENDED);
> > +	if (oldpage < 0) {
> > +		rc = oldpage;
> > +		goto out;
> > +	}
> >  
> > -	reg_val = phy_read(phydev, MSCC_PHY_EXT_MODE_CNTL);
> > +	reg_val = __phy_read(phydev, MSCC_PHY_EXT_MODE_CNTL);
> >  	reg_val &= ~(FORCE_MDI_CROSSOVER_MASK);
> >  	if (mdix == ETH_TP_MDI)
> >  		reg_val |= FORCE_MDI_CROSSOVER_MDI;
> >  	else if (mdix == ETH_TP_MDI_X)
> >  		reg_val |= FORCE_MDI_CROSSOVER_MDIX;
> 
> Hi Quentin
> 
> Could you use phy_modify_paged() here? This function only accesses a
> single register, so using the wrapper should not have any
> disadvantages. The same should apply for any function modifying a single
> register.
> 

Sure, will do.

Thanks,
Quentin

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[PATCH net-next v2 2/6] net: phy: mscc: add ethtool statistics counters

[Quentin Schulz]

From: Raju Lakkaraju <Raju.Lakkaraju@microsemi.com>

There are a few counters available in the PHY: receive errors, false
carriers, link disconnects, media CRC errors and valids counters.

So let's expose those in the PHY driver.

Use the priv structure as the next PHY to be supported has a few
additional counters.

Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microsemi.com>
Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
---
 drivers/net/phy/mscc.c | 127 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)

diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c
index 35d58e7b95e9..ca97488d76ef 100644
--- a/drivers/net/phy/mscc.c
+++ b/drivers/net/phy/mscc.c
@@ -33,6 +33,11 @@ enum rgmii_rx_clock_delay {
 #define DISABLE_PAIR_SWAP_CORR_MASK	  0x0020
 #define DISABLE_POLARITY_CORR_MASK	  0x0010
 
+#define MSCC_PHY_ERR_RX_CNT		  19
+#define MSCC_PHY_ERR_FALSE_CARRIER_CNT	  20
+#define MSCC_PHY_ERR_LINK_DISCONNECT_CNT  21
+#define ERR_CNT_MASK			  GENMASK(7, 0)
+
 #define MSCC_PHY_EXT_PHY_CNTL_1           23
 #define MAC_IF_SELECTION_MASK             0x1800
 #define MAC_IF_SELECTION_GMII             0
@@ -64,6 +69,9 @@ enum rgmii_rx_clock_delay {
 #define MSCC_PHY_PAGE_EXTENDED_2	  0x0002 /* Extended reg - page 2 */
 
 /* Extended Page 1 Registers */
+#define MSCC_PHY_CU_MEDIA_CRC_VALID_CNT	  18
+#define VALID_CRC_CNT_CRC_MASK		  GENMASK(13, 0)
+
 #define MSCC_PHY_EXT_MODE_CNTL		  19
 #define FORCE_MDI_CROSSOVER_MASK	  0x000C
 #define FORCE_MDI_CROSSOVER_MDIX	  0x000C
@@ -74,6 +82,8 @@ enum rgmii_rx_clock_delay {
 #define DOWNSHIFT_EN			  0x0010
 #define DOWNSHIFT_CNTL_POS		  2
 
+#define MSCC_PHY_EXT_PHY_CNTL_4		  23
+
 /* Extended Page 2 Registers */
 #define MSCC_PHY_RGMII_CNTL		  20
 #define RGMII_RX_CLK_DELAY_MASK		  0x0070
@@ -119,11 +129,50 @@ enum rgmii_rx_clock_delay {
 				BIT(VSC8531_FORCE_LED_OFF) | \
 				BIT(VSC8531_FORCE_LED_ON))
 
+struct vsc85xx_hw_stat {
+	const char *string;
+	u8 reg;
+	u16 page;
+	u16 mask;
+};
+
+static const struct vsc85xx_hw_stat vsc85xx_hw_stats[] = {
+	{
+		.string	= "phy_receive_errors",
+		.reg	= MSCC_PHY_ERR_RX_CNT,
+		.page	= MSCC_PHY_PAGE_STANDARD,
+		.mask	= ERR_CNT_MASK,
+	}, {
+		.string	= "phy_false_carrier",
+		.reg	= MSCC_PHY_ERR_FALSE_CARRIER_CNT,
+		.page	= MSCC_PHY_PAGE_STANDARD,
+		.mask	= ERR_CNT_MASK,
+	}, {
+		.string	= "phy_cu_media_link_disconnect",
+		.reg	= MSCC_PHY_ERR_LINK_DISCONNECT_CNT,
+		.page	= MSCC_PHY_PAGE_STANDARD,
+		.mask	= ERR_CNT_MASK,
+	}, {
+		.string	= "phy_cu_media_crc_good_count",
+		.reg	= MSCC_PHY_CU_MEDIA_CRC_VALID_CNT,
+		.page	= MSCC_PHY_PAGE_EXTENDED,
+		.mask	= VALID_CRC_CNT_CRC_MASK,
+	}, {
+		.string	= "phy_cu_media_crc_error_count",
+		.reg	= MSCC_PHY_EXT_PHY_CNTL_4,
+		.page	= MSCC_PHY_PAGE_EXTENDED,
+		.mask	= ERR_CNT_MASK,
+	},
+};
+
 struct vsc8531_private {
 	int rate_magic;
 	u16 supp_led_modes;
 	u32 leds_mode[MAX_LEDS];
 	u8 nleds;
+	const struct vsc85xx_hw_stat *hw_stats;
+	u64 *stats;
+	int nstats;
 };
 
 #ifdef CONFIG_OF_MDIO
@@ -150,6 +199,66 @@ static int vsc85xx_phy_write_page(struct phy_device *phydev, int page)
 	return __phy_write(phydev, MSCC_EXT_PAGE_ACCESS, page);
 }
 
+static int vsc85xx_get_sset_count(struct phy_device *phydev)
+{
+	struct vsc8531_private *priv = phydev->priv;
+
+	if (!priv)
+		return 0;
+
+	return priv->nstats;
+}
+
+static void vsc85xx_get_strings(struct phy_device *phydev, u8 *data)
+{
+	struct vsc8531_private *priv = phydev->priv;
+	int i;
+
+	if (!priv)
+		return;
+
+	for (i = 0; i < priv->nstats; i++)
+		strlcpy(data + i * ETH_GSTRING_LEN, priv->hw_stats[i].string,
+			ETH_GSTRING_LEN);
+}
+
+static u64 vsc85xx_get_stat(struct phy_device *phydev, int i)
+{
+	struct vsc8531_private *priv = phydev->priv;
+	int val, oldpage;
+	u64 ret;
+
+	oldpage = phy_select_page(phydev, priv->hw_stats[i].page);
+
+	val = __phy_read(phydev, priv->hw_stats[i].reg);
+	if (val < 0) {
+		ret = U64_MAX;
+		goto out;
+	}
+
+	val = val & priv->hw_stats[i].mask;
+	priv->stats[i] += val;
+	ret = priv->stats[i];
+
+out:
+	phy_restore_page(phydev, oldpage, ret);
+
+	return ret;
+}
+
+static void vsc85xx_get_stats(struct phy_device *phydev,
+			      struct ethtool_stats *stats, u64 *data)
+{
+	struct vsc8531_private *priv = phydev->priv;
+	int i;
+
+	if (!priv)
+		return;
+
+	for (i = 0; i < priv->nstats; i++)
+		data[i] = vsc85xx_get_stat(phydev, i);
+}
+
 static int vsc85xx_led_cntl_set(struct phy_device *phydev,
 				u8 led_num,
 				u8 mode)
@@ -681,6 +790,12 @@ static int vsc85xx_probe(struct phy_device *phydev)
 	vsc8531->rate_magic = rate_magic;
 	vsc8531->nleds = 2;
 	vsc8531->supp_led_modes = VSC85XX_SUPP_LED_MODES;
+	vsc8531->hw_stats = vsc85xx_hw_stats;
+	vsc8531->nstats = ARRAY_SIZE(vsc85xx_hw_stats);
+	vsc8531->stats = devm_kmalloc_array(&phydev->mdio.dev, vsc8531->nstats,
+					    sizeof(u64), GFP_KERNEL);
+	if (!vsc8531->stats)
+		return -ENOMEM;
 
 	return vsc85xx_dt_led_modes_get(phydev, default_mode);
 }
@@ -709,6 +824,9 @@ static struct phy_driver vsc85xx_driver[] = {
 	.set_tunable	= &vsc85xx_set_tunable,
 	.read_page	= &vsc85xx_phy_read_page,
 	.write_page	= &vsc85xx_phy_write_page,
+	.get_sset_count = &vsc85xx_get_sset_count,
+	.get_strings    = &vsc85xx_get_strings,
+	.get_stats      = &vsc85xx_get_stats,
 },
 {
 	.phy_id		= PHY_ID_VSC8531,
@@ -732,6 +850,9 @@ static struct phy_driver vsc85xx_driver[] = {
 	.set_tunable	= &vsc85xx_set_tunable,
 	.read_page	= &vsc85xx_phy_read_page,
 	.write_page	= &vsc85xx_phy_write_page,
+	.get_sset_count = &vsc85xx_get_sset_count,
+	.get_strings    = &vsc85xx_get_strings,
+	.get_stats      = &vsc85xx_get_stats,
 },
 {
 	.phy_id		= PHY_ID_VSC8540,
@@ -755,6 +876,9 @@ static struct phy_driver vsc85xx_driver[] = {
 	.set_tunable	= &vsc85xx_set_tunable,
 	.read_page	= &vsc85xx_phy_read_page,
 	.write_page	= &vsc85xx_phy_write_page,
+	.get_sset_count = &vsc85xx_get_sset_count,
+	.get_strings    = &vsc85xx_get_strings,
+	.get_stats      = &vsc85xx_get_stats,
 },
 {
 	.phy_id		= PHY_ID_VSC8541,
@@ -778,6 +902,9 @@ static struct phy_driver vsc85xx_driver[] = {
 	.set_tunable	= &vsc85xx_set_tunable,
 	.read_page	= &vsc85xx_phy_read_page,
 	.write_page	= &vsc85xx_phy_write_page,
+	.get_sset_count = &vsc85xx_get_sset_count,
+	.get_strings    = &vsc85xx_get_strings,
+	.get_stats      = &vsc85xx_get_stats,
 }
 
 };
-- 
2.17.1

Re: [PATCH net-next v2 2/6] net: phy: mscc: add ethtool statistics counters

[Andrew Lunn]

On Thu, Oct 04, 2018 at 02:47:24PM +0200, Quentin Schulz wrote:

Hi Quentin

> +static u64 vsc85xx_get_stat(struct phy_device *phydev, int i)
> +{
> +	struct vsc8531_private *priv = phydev->priv;
> +	int val, oldpage;
> +	u64 ret;
> +
> +	oldpage = phy_select_page(phydev, priv->hw_stats[i].page);
> +
> +	val = __phy_read(phydev, priv->hw_stats[i].reg);
> +	if (val < 0) {
> +		ret = U64_MAX;
> +		goto out;
> +	}

phy_read_paged() should work here as well.

> +
> +	val = val & priv->hw_stats[i].mask;
> +	priv->stats[i] += val;
> +	ret = priv->stats[i];

Otherwise this looks good.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

[PATCH net-next v2 3/6] net: phy: mscc: Add EEE init sequence

[Quentin Schulz]

From: Raju Lakkaraju <Raju.Lakkaraju@microchip.com>

Microsemi PHYs (VSC 8530/31/40/41) need to update the Energy Efficient
Ethernet initialization sequence.
In order to avoid certain link state errors that could result in link
drops and packet loss, the physical coding sublayer (PCS) must be
updated with settings related to EEE in order to improve performance.

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
---
 drivers/net/phy/mscc.c | 65 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c
index ca97488d76ef..f863a580308f 100644
--- a/drivers/net/phy/mscc.c
+++ b/drivers/net/phy/mscc.c
@@ -67,6 +67,7 @@ enum rgmii_rx_clock_delay {
 #define MSCC_PHY_PAGE_STANDARD		  0x0000 /* Standard registers */
 #define MSCC_PHY_PAGE_EXTENDED		  0x0001 /* Extended registers */
 #define MSCC_PHY_PAGE_EXTENDED_2	  0x0002 /* Extended reg - page 2 */
+#define MSCC_PHY_PAGE_TR		  0x52b5 /* Token ring registers */
 
 /* Extended Page 1 Registers */
 #define MSCC_PHY_CU_MEDIA_CRC_VALID_CNT	  18
@@ -100,6 +101,13 @@ enum rgmii_rx_clock_delay {
 #define SECURE_ON_ENABLE		  0x8000
 #define SECURE_ON_PASSWD_LEN_4		  0x4000
 
+/* Token ring page Registers */
+#define MSCC_PHY_TR_CNTL		  16
+#define TR_WRITE			  0x8000
+#define TR_ADDR(x)			  (0x7fff & (x))
+#define MSCC_PHY_TR_LSB			  17
+#define MSCC_PHY_TR_MSB			  18
+
 /* Microsemi PHY ID's */
 #define PHY_ID_VSC8530			  0x00070560
 #define PHY_ID_VSC8531			  0x00070570
@@ -129,6 +137,11 @@ enum rgmii_rx_clock_delay {
 				BIT(VSC8531_FORCE_LED_OFF) | \
 				BIT(VSC8531_FORCE_LED_ON))
 
+struct reg_val {
+	u16	reg;
+	u32	val;
+};
+
 struct vsc85xx_hw_stat {
 	const char *string;
 	u8 reg;
@@ -693,6 +706,54 @@ static int vsc85xx_set_tunable(struct phy_device *phydev,
 	}
 }
 
+/* mdiobus lock should be locked when using this function */
+static void vsc85xx_tr_write(struct phy_device *phydev, u16 addr, u32 val)
+{
+	__phy_write(phydev, MSCC_PHY_TR_MSB, val >> 16);
+	__phy_write(phydev, MSCC_PHY_TR_LSB, val & GENMASK(15, 0));
+	__phy_write(phydev, MSCC_PHY_TR_CNTL, TR_WRITE | TR_ADDR(addr));
+}
+
+static int vsc85xx_eee_init_seq_set(struct phy_device *phydev)
+{
+	const struct reg_val init_eee[] = {
+		{0x0f82, 0x0012b00a},
+		{0x1686, 0x00000004},
+		{0x168c, 0x00d2c46f},
+		{0x17a2, 0x00000620},
+		{0x16a0, 0x00eeffdd},
+		{0x16a6, 0x00071448},
+		{0x16a4, 0x0013132f},
+		{0x16a8, 0x00000000},
+		{0x0ffc, 0x00c0a028},
+		{0x0fe8, 0x0091b06c},
+		{0x0fea, 0x00041600},
+		{0x0f80, 0x00000af4},
+		{0x0fec, 0x00901809},
+		{0x0fee, 0x0000a6a1},
+		{0x0ffe, 0x00b01007},
+		{0x16b0, 0x00eeff00},
+		{0x16b2, 0x00007000},
+		{0x16b4, 0x00000814},
+	};
+	unsigned int i;
+	int oldpage;
+
+	mutex_lock(&phydev->lock);
+	oldpage = phy_select_page(phydev, MSCC_PHY_PAGE_TR);
+	if (oldpage < 0)
+		goto out_unlock;
+
+	for (i = 0; i < ARRAY_SIZE(init_eee); i++)
+		vsc85xx_tr_write(phydev, init_eee[i].reg, init_eee[i].val);
+
+out_unlock:
+	oldpage = phy_restore_page(phydev, oldpage, oldpage);
+	mutex_unlock(&phydev->lock);
+
+	return oldpage;
+}
+
 static int vsc85xx_config_init(struct phy_device *phydev)
 {
 	int rc, i;
@@ -710,6 +771,10 @@ static int vsc85xx_config_init(struct phy_device *phydev)
 	if (rc)
 		return rc;
 
+	rc = vsc85xx_eee_init_seq_set(phydev);
+	if (rc)
+		return rc;
+
 	for (i = 0; i < vsc8531->nleds; i++) {
 		rc = vsc85xx_led_cntl_set(phydev, i, vsc8531->leds_mode[i]);
 		if (rc)
-- 
2.17.1

[PATCH net-next v2 4/6] net: phy: mscc: remove unneeded parenthesis

[Quentin Schulz]

The == operator precedes the || operator, so we can remove the
parenthesis around (a == b) || (c == d).

The condition is rather explicit and short so removing the parenthesis
definitely does not make it harder to read.

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
---
 drivers/net/phy/mscc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c
index f863a580308f..c136ed71110b 100644
--- a/drivers/net/phy/mscc.c
+++ b/drivers/net/phy/mscc.c
@@ -308,7 +308,7 @@ static int vsc85xx_mdix_set(struct phy_device *phydev, u8 mdix)
 	u16 reg_val;
 
 	reg_val = phy_read(phydev, MSCC_PHY_BYPASS_CONTROL);
-	if ((mdix == ETH_TP_MDI) || (mdix == ETH_TP_MDI_X)) {
+	if (mdix == ETH_TP_MDI || mdix == ETH_TP_MDI_X) {
 		reg_val |= (DISABLE_PAIR_SWAP_CORR_MASK |
 			    DISABLE_POLARITY_CORR_MASK  |
 			    DISABLE_HP_AUTO_MDIX_MASK);
-- 
2.17.1

[PATCH net-next v2 5/6] net: phy: mscc: shorten `x != 0` condition to `x`

[Quentin Schulz]

`if (x != 0)` is basically a more verbose version of `if (x)` so let's
use the latter so it's consistent throughout the whole driver.

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
---
 drivers/net/phy/mscc.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c
index c136ed71110b..720d8dc81410 100644
--- a/drivers/net/phy/mscc.c
+++ b/drivers/net/phy/mscc.c
@@ -318,7 +318,7 @@ static int vsc85xx_mdix_set(struct phy_device *phydev, u8 mdix)
 			     DISABLE_HP_AUTO_MDIX_MASK);
 	}
 	rc = phy_write(phydev, MSCC_PHY_BYPASS_CONTROL, reg_val);
-	if (rc != 0)
+	if (rc)
 		return rc;
 
 	oldpage = phy_select_page(phydev, MSCC_PHY_PAGE_EXTENDED);
@@ -334,7 +334,7 @@ static int vsc85xx_mdix_set(struct phy_device *phydev, u8 mdix)
 	else if (mdix == ETH_TP_MDI_X)
 		reg_val |= FORCE_MDI_CROSSOVER_MDIX;
 	rc = __phy_write(phydev, MSCC_PHY_EXT_MODE_CNTL, reg_val);
-	if (rc != 0)
+	if (rc)
 		goto out;
 
 	rc = phy_restore_page(phydev, oldpage, rc);
@@ -458,14 +458,14 @@ static int vsc85xx_wol_set(struct phy_device *phydev,
 		reg_val = phy_read(phydev, MII_VSC85XX_INT_MASK);
 		reg_val |= MII_VSC85XX_INT_MASK_WOL;
 		rc = phy_write(phydev, MII_VSC85XX_INT_MASK, reg_val);
-		if (rc != 0)
+		if (rc)
 			goto out_unlock;
 	} else {
 		/* Disable the WOL interrupt */
 		reg_val = phy_read(phydev, MII_VSC85XX_INT_MASK);
 		reg_val &= (~MII_VSC85XX_INT_MASK_WOL);
 		rc = phy_write(phydev, MII_VSC85XX_INT_MASK, reg_val);
-		if (rc != 0)
+		if (rc)
 			goto out_unlock;
 	}
 	/* Clear WOL iterrupt status */
@@ -614,7 +614,7 @@ static int vsc85xx_edge_rate_cntl_set(struct phy_device *phydev, u8 edge_rate)
 	reg_val &= ~(EDGE_RATE_CNTL_MASK);
 	reg_val |= (edge_rate << EDGE_RATE_CNTL_POS);
 	rc = __phy_write(phydev, MSCC_PHY_WOL_MAC_CONTROL, reg_val);
-	if (rc != 0)
+	if (rc)
 		goto out_unlock;
 
 out_unlock:
@@ -649,7 +649,7 @@ static int vsc85xx_mac_if_set(struct phy_device *phydev,
 		goto out_unlock;
 	}
 	rc = phy_write(phydev, MSCC_PHY_EXT_PHY_CNTL_1, reg_val);
-	if (rc != 0)
+	if (rc)
 		goto out_unlock;
 
 	rc = genphy_soft_reset(phydev);
-- 
2.17.1

[PATCH net-next v2 6/6] net: phy: mscc: remove unneeded temporary variable

[Quentin Schulz]

Here, the rc variable is either used only for the condition right after
the assignment or right before being used as the return value of the
function it's being used in.

So let's remove this unneeded temporary variable whenever possible.

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
---
 drivers/net/phy/mscc.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c
index 720d8dc81410..9c7159e1ae17 100644
--- a/drivers/net/phy/mscc.c
+++ b/drivers/net/phy/mscc.c
@@ -514,7 +514,7 @@ static void vsc85xx_wol_get(struct phy_device *phydev,
 static int vsc85xx_edge_rate_magic_get(struct phy_device *phydev)
 {
 	u32 vdd, sd;
-	int rc, i, j;
+	int i, j;
 	struct device *dev = &phydev->mdio.dev;
 	struct device_node *of_node = dev->of_node;
 	u8 sd_array_size = ARRAY_SIZE(edge_table[0].slowdown);
@@ -522,12 +522,10 @@ static int vsc85xx_edge_rate_magic_get(struct phy_device *phydev)
 	if (!of_node)
 		return -ENODEV;
 
-	rc = of_property_read_u32(of_node, "vsc8531,vddmac", &vdd);
-	if (rc != 0)
+	if (of_property_read_u32(of_node, "vsc8531,vddmac", &vdd))
 		vdd = MSCC_VDDMAC_3300;
 
-	rc = of_property_read_u32(of_node, "vsc8531,edge-slowdown", &sd);
-	if (rc != 0)
+	if (of_property_read_u32(of_node, "vsc8531,edge-slowdown", &sd))
 		sd = 0;
 
 	for (i = 0; i < ARRAY_SIZE(edge_table); i++)
@@ -781,9 +779,7 @@ static int vsc85xx_config_init(struct phy_device *phydev)
 			return rc;
 	}
 
-	rc = genphy_config_init(phydev);
-
-	return rc;
+	return genphy_config_init(phydev);
 }
 
 static int vsc85xx_ack_interrupt(struct phy_device *phydev)
-- 
2.17.1