[PATCH] net: ethernet: ti: am65-cpsw-nuss: enable 10Mbps link speed in rgmii mode

[Murali Karicheri]

In RGMII mode the 10Mbps link speed is supported only when CPSW2G MAC SL is
configured for External Control ("in band") mode
CPSW_PN_MAC_CONTROL_REG.CTL_EN(18) = 1

Hence update am65_cpsw_update_link() to follow documentation.

Signed-off-by: Murali Karicheri <m-kariche...@ti.com>
---
 drivers/net/ti/am65-cpsw-nuss.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ti/am65-cpsw-nuss.c b/drivers/net/ti/am65-cpsw-nuss.c
index 2b77213001..7531a07203 100644
--- a/drivers/net/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ti/am65-cpsw-nuss.c
@@ -61,6 +61,7 @@
 
 #define AM65_CPSW_MACSL_CTL_REG                        0x0
 #define AM65_CPSW_MACSL_CTL_REG_IFCTL_A                BIT(15)
+#define AM65_CPSW_MACSL_CTL_EXT_EN             BIT(18)
 #define AM65_CPSW_MACSL_CTL_REG_GIG            BIT(7)
 #define AM65_CPSW_MACSL_CTL_REG_GMII_EN                BIT(5)
 #define AM65_CPSW_MACSL_CTL_REG_LOOPBACK       BIT(1)
@@ -187,6 +188,9 @@ static int am65_cpsw_update_link(struct am65_cpsw_priv 
*priv)
                              AM65_CPSW_MACSL_CTL_REG_GMII_EN;
                if (phy->speed == 1000)
                        mac_control |= AM65_CPSW_MACSL_CTL_REG_GIG;
+               if (phy->speed == 10 && phy_interface_is_rgmii(phy))
+                       /* Can be used with in band mode only */
+                       mac_control |= AM65_CPSW_MACSL_CTL_EXT_EN;
                if (phy->duplex == DUPLEX_FULL)
                        mac_control |= AM65_CPSW_MACSL_CTL_REG_FULL_DUPLEX;
                if (phy->speed == 100)
-- 
2.17.0