[PATCH v4 net 0/3] lan78xx: This series of patches are for lan78xx driver.

This series of patches are for lan78xx driver.

These patches fixes potential issues associated with lan78xx driver.

v4
- Updated changes to handle return values as per comments
- Updated EEPROM write handling as per comments

v3
- Updated chagnes as per comments

v2
- Added patch version information
- Added fixes tag
- Updated patch description
- Updated chagnes as per comments

v1
- Splitted patches as per comments
- Dropped "fixed_phy device support" and "Fix for system suspend" changes

Nisar Sayed (3):
  Fix for eeprom read/write when device auto suspend
  Allow EEPROM write for less than MAX_EEPROM_SIZE
  Use default values loaded from EEPROM/OTP after reset

 drivers/net/usb/lan78xx.c | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

-- 
2.14.1

Fix for eeprom read/write when device auto suspend

Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Signed-off-by: Nisar Sayed <redacted>
---
 drivers/net/usb/lan78xx.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index b99a7fb09f8e..fcf85ae37435 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c

@@ -1265,30 +1265,46 @@ static int lan78xx_ethtool_get_eeprom(struct net_device *netdev,
 				      struct ethtool_eeprom *ee, u8 *data)
 {
 	struct lan78xx_net *dev = netdev_priv(netdev);
+	int ret;
+
+	ret = usb_autopm_get_interface(dev->intf);
+	if (ret)
+		return ret;
 
 	ee->magic = LAN78XX_EEPROM_MAGIC;
 
-	return lan78xx_read_raw_eeprom(dev, ee->offset, ee->len, data);
+	ret = lan78xx_read_raw_eeprom(dev, ee->offset, ee->len, data);
+
+	usb_autopm_put_interface(dev->intf);
+
+	return ret;
 }
 
 static int lan78xx_ethtool_set_eeprom(struct net_device *netdev,
 				      struct ethtool_eeprom *ee, u8 *data)
 {
 	struct lan78xx_net *dev = netdev_priv(netdev);
+	int ret;
+
+	ret = usb_autopm_get_interface(dev->intf);
+	if (ret)
+		return ret;
 
 	/* Allow entire eeprom update only */
 	if ((ee->magic == LAN78XX_EEPROM_MAGIC) &&
 	    (ee->offset == 0) &&
 	    (ee->len == 512) &&
 	    (data[0] == EEPROM_INDICATOR))
-		return lan78xx_write_raw_eeprom(dev, ee->offset, ee->len, data);
+		ret = lan78xx_write_raw_eeprom(dev, ee->offset, ee->len, data);
 	else if ((ee->magic == LAN78XX_OTP_MAGIC) &&
 		 (ee->offset == 0) &&
 		 (ee->len == 512) &&
 		 (data[0] == OTP_INDICATOR_1))
-		return lan78xx_write_raw_otp(dev, ee->offset, ee->len, data);
+		ret = lan78xx_write_raw_otp(dev, ee->offset, ee->len, data);
 
-	return -EINVAL;
+	usb_autopm_put_interface(dev->intf);
+
+	return ret;
 }
 
 static void lan78xx_get_strings(struct net_device *netdev, u32 stringset,

-- 
2.14.1

Allow EEPROM write for less than MAX_EEPROM_SIZE

Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Signed-off-by: Nisar Sayed <redacted>
---
 drivers/net/usb/lan78xx.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index fcf85ae37435..3292f56ffe02 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c

@@ -1290,11 +1290,10 @@ static int lan78xx_ethtool_set_eeprom(struct net_device *netdev,
 	if (ret)
 		return ret;
 
-	/* Allow entire eeprom update only */
-	if ((ee->magic == LAN78XX_EEPROM_MAGIC) &&
-	    (ee->offset == 0) &&
-	    (ee->len == 512) &&
-	    (data[0] == EEPROM_INDICATOR))
+	/* Invalid EEPROM_INDICATOR at offset zero will result in fail to
+	 * load data from EEPROM
+	 */
+	if (ee->magic == LAN78XX_EEPROM_MAGIC)
 		ret = lan78xx_write_raw_eeprom(dev, ee->offset, ee->len, data);
 	else if ((ee->magic == LAN78XX_OTP_MAGIC) &&
 		 (ee->offset == 0) &&

-- 
2.14.1

Use default value of auto duplex and auto speed values loaded
from EEPROM/OTP after reset. The LAN78xx allows platform
configurations to be loaded from EEPROM/OTP.
Ex: When external phy is connected, the MAC can be configured to
have correct auto speed, auto duplex, auto polarity configured
from the EEPROM/OTP.

Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Signed-off-by: Nisar Sayed <redacted>
---
 drivers/net/usb/lan78xx.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index 3292f56ffe02..0fc3c19d5aef 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c

@@ -2449,7 +2449,6 @@ static int lan78xx_reset(struct lan78xx_net *dev)
 	/* LAN7801 only has RGMII mode */
 	if (dev->chipid == ID_REV_CHIP_ID_7801_)
 		buf &= ~MAC_CR_GMII_EN_;
-	buf |= MAC_CR_AUTO_DUPLEX_ | MAC_CR_AUTO_SPEED_;
 	ret = lan78xx_write_reg(dev, MAC_CR, buf);
 
 	ret = lan78xx_read_reg(dev, MAC_TX, &buf);

-- 
2.14.1

Hello!

On 09/19/2017 01:02 AM, Nisar Sayed wrote:

    s/fail/a failure/.

+	 * load data from EEPROM
+	 */
+	if (ee->magic == LAN78XX_EEPROM_MAGIC)
  		ret = lan78xx_write_raw_eeprom(dev, ee->offset, ee->len, data);
  	else if ((ee->magic == LAN78XX_OTP_MAGIC) &&
  		 (ee->offset == 0) &&

MBR, Sergei

Thanks Sergei, I will update it and submit next version.

- Nisar

 > Hello!

On 09/19/2017 01:02 AM, Nisar Sayed wrote:

quoted

Allow EEPROM write for less than MAX_EEPROM_SIZE

Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to
10/100/1000 Ethernet device driver")
Signed-off-by: Nisar Sayed <redacted>
---
  drivers/net/usb/lan78xx.c | 9 ++++-----
  1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index fcf85ae37435..3292f56ffe02 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c

@@ -1290,11 +1290,10 @@ static int lan78xx_ethtool_set_eeprom(struct

net_device *netdev,

quoted

  	if (ret)
  		return ret;

-	/* Allow entire eeprom update only */
-	if ((ee->magic == LAN78XX_EEPROM_MAGIC) &&
-	    (ee->offset == 0) &&
-	    (ee->len == 512) &&
-	    (data[0] == EEPROM_INDICATOR))
+	/* Invalid EEPROM_INDICATOR at offset zero will result in fail to

    s/fail/a failure/.

quoted

+	 * load data from EEPROM
+	 */
+	if (ee->magic == LAN78XX_EEPROM_MAGIC)
  		ret = lan78xx_write_raw_eeprom(dev, ee->offset, ee->len,

data);

quoted

  	else if ((ee->magic == LAN78XX_OTP_MAGIC) &&
  		 (ee->offset == 0) &&

MBR, Sergei