[PATCH net 1/3] lan78xx: Set ASD in MAC_CR when EEE is enabled.

Description:
EEE does not work with lan7800 when AutoSpeed is not set.
(This can happen when EEPROM is not populated or configured incorrectly)

Root-Cause:
When EEE is enabled, the mac config register ASD is not set
i.e in default state,causing EEE fail.

Fix:
Set the register when eeprom is not present.

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

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index 11176070b345..e2d26f9c0f6a 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c

@@ -2351,6 +2351,7 @@ static int lan78xx_reset(struct lan78xx_net *dev)
 	u32 buf;
 	int ret = 0;
 	unsigned long timeout;
+	u8 sig;
 
 	ret = lan78xx_read_reg(dev, HW_CFG, &buf);
 	buf |= HW_CFG_LRST_;

@@ -2450,6 +2451,15 @@ 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_;
+
+	if(dev->chipid == ID_REV_CHIP_ID_7800_) {
+		ret = lan78xx_read_raw_eeprom(dev, 0, 1, &sig);
+		if ((!ret) && (sig != EEPROM_INDICATOR)) {
+			/*Implies there is no external eeprom. Set mac speed*/
+			netdev_info(dev->net, "No External EEPROM. Setting MAC Speed \n");
+			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);

-- 
2.16.2

Hello!

   Only stylistic comments.

On 3/22/2018 10:41 AM, Raghuram Chary J wrote:

Description:
EEE does not work with lan7800 when AutoSpeed is not set.
(This can happen when EEPROM is not populated or configured incorrectly)

Root-Cause:
When EEE is enabled, the mac config register ASD is not set
i.e in default state,causing EEE fail.

   Need a period after "i.e" and a space after comma.

   Please run your patches thru scripts/checkpatch.pl -- it would have complained because of a missing space between *if* and (.

+		ret = lan78xx_read_raw_eeprom(dev, 0, 1, &sig);
+		if ((!ret) && (sig != EEPROM_INDICATOR)) {

   No need for the inner parens here, especially the 1st pair...

+			/*Implies there is no external eeprom. Set mac speed*/

   Please add space after /*  and before */.

MBR, Sergei

Hi Sergei,

Hello!

    Only stylistic comments.

Thanks for the comments. Will address them and submit in v1 patch.

Thanks,
-Raghu