From: David Jander <david@xxxxxxxxxxx>
In case this PHY is bootstrapped for managed mode, we need to manually
wake it. Otherwise no link will be detected.
Signed-off-by: David Jander <david@xxxxxxxxxxx>
Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
---
drivers/net/phy/dp83tg720.c | 26 +++++++++++++++++++++++---
1 file changed, 23 insertions(+), 3 deletions(-)
diff --git a/drivers/net/phy/dp83tg720.c b/drivers/net/phy/dp83tg720.c
index 0571f4cb52..d57985539d 100644
--- a/drivers/net/phy/dp83tg720.c
+++ b/drivers/net/phy/dp83tg720.c
@@ -21,6 +21,11 @@
#define DP83TG720S_PHY_RESET 0x1f
#define DP83TG720S_HW_RESET BIT(15)
+#define DP83TG720S_LPS_CFG3 0x18c
+/* Power modes are documented as bitfields but used as values */
+/* Power Mode 0 is Normal mode */
+#define DP83TG720S_LPS_CFG3_PWR_MODE_0 BIT(0)
+
static int dp83tg720_config_rgmii_delay(struct phy_device *phydev)
{
u16 rgmii_delay_mask;
@@ -54,6 +59,8 @@ static int dp83tg720_config_rgmii_delay(struct phy_device *phydev)
static int dp83tg720_phy_init(struct phy_device *phydev)
{
+ int ret = 0;
+
/* HW reset is needed to recover link if previous link was lost. SW
* reset is not enough.
*/
@@ -62,10 +69,23 @@ static int dp83tg720_phy_init(struct phy_device *phydev)
phydev->supported = SUPPORTED_1000baseT_Full;
phydev->advertising = SUPPORTED_1000baseT_Full;
- if (phy_interface_is_rgmii(phydev))
- return dp83tg720_config_rgmii_delay(phydev);
+ /* According to the "DP83TG720R-Q1 1000BASE-T1 Automotive Ethernet PHY
+ * datasheet (Rev. C)" - "T6.2 Post reset stabilization-time prior to
+ * MDC preamble for register access is 1ms."
+ */
+ mdelay(1);
- return 0;
+ if (phy_interface_is_rgmii(phydev)) {
+ ret = dp83tg720_config_rgmii_delay(phydev);
+ if (ret)
+ return ret;
+ }
+
+ /* In case the PHY is bootstrapped in managed mode, we need to
+ * wake it.
+ */
+ return phy_write_mmd(phydev, MDIO_MMD_VEND2, DP83TG720S_LPS_CFG3,
+ DP83TG720S_LPS_CFG3_PWR_MODE_0);
}
static int dp83tg720_read_status(struct phy_device *phydev)
--
2.39.2
