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 <raghuramchary.jallipa...@microchip.com>
---
v0->v1:
* Resolved the style related problems.
* Removed 1/3 patch count from Subject line.
---
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 60a604cc7647..90d176279152 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
