[U-Boot] [PATCH 1/6] net: ti: cpsw: enable 10Mbps link speed support in rgmii mode

[Grygorii Strashko]

According to TRMs the 10Mbps link speed is supported in RGMII only when
CPSW2G MAC SL is configured for External Control ("in band") mode
CPSW_SL_MACCTRL.EXT_EN(18) = 1.

Hence update cpsw_slave_update_link() to follow documentation.

[1] https://patchwork.kernel.org/patch/10285239/
Signed-off-by: Grygorii Strashko <grygorii.strashko at ti.com>
---
 drivers/net/ti/cpsw.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ti/cpsw.c b/drivers/net/ti/cpsw.c
index 20ddb44dd8..f0d008f0f5 100644
--- a/drivers/net/ti/cpsw.c
+++ b/drivers/net/ti/cpsw.c
@@ -33,6 +33,7 @@ DECLARE_GLOBAL_DATA_PTR;
 #define GIGABITEN		BIT(7)
 #define FULLDUPLEXEN		BIT(0)
 #define MIIEN			BIT(15)
+#define CTL_EXT_EN		BIT(18)
 /* DMA Registers */
 #define CPDMA_TXCONTROL		0x004
 #define CPDMA_RXCONTROL		0x014
@@ -489,6 +490,8 @@ static int cpsw_slave_update_link(struct cpsw_slave *slave,
 			mac_control |= FULLDUPLEXEN;
 		if (phy->speed == 100)
 			mac_control |= MIIEN;
+		if (phy->speed == 10 && phy_interface_is_rgmii(phy))
+			mac_control |= CTL_EXT_EN;
 	}
 
 	if (mac_control == slave->mac_control)
-- 
2.17.1