net: ethernet: ti: cpsw: add check for in-band mode setting with RGMII PHY interface

BugLink: http://bugs.launchpad.net/bugs/1760585
[ Upstream commit f9db50691db4a7d860fce985f080bb3fc23a7ede ]

According to AM335x TRM[1] 14.3.6.2, AM437x TRM[2] 15.3.6.2 and
DRA7 TRM[3] 24.11.4.8.7.3.3, in-band mode in EXT_EN(bit18) register is only
available when PHY is configured in RGMII mode with 10Mbps speed. It will
cause some networking issues without RGMII mode, such as carrier sense
errors and low throughput. TI also mentioned this issue in their forum[4].

This patch adds the check mechanism for PHY interface with RGMII interface
type, the in-band mode can only be set in RGMII mode with 10Mbps speed.

References:
[1]: https://www.ti.com/lit/ug/spruh73p/spruh73p.pdf
[2]: http://www.ti.com/lit/ug/spruhl7h/spruhl7h.pdf
[3]: http://www.ti.com/lit/ug/spruic2b/spruic2b.pdf
[4]: https://e2e.ti.com/support/arm/sitara_arm/f/791/p/640765/2392155

Suggested-by: Holsety Chen (陳憲輝) <Holsety.Chen@moxa.com>
Signed-off-by: SZ Lin (林上智) <sz.lin@moxa.com>
Signed-off-by: Schuyler Patton <spatton@ti.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index a1ffc3ed77f9538af26ca4c4826c1b5192e20c97..c08d74cd1fd2709d81e645702983789b2c91ea00 100644 (file)
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -996,7 +996,8 @@ static void _cpsw_adjust_link(struct cpsw_slave *slave,
                /* set speed_in input in case RMII mode is used in 100Mbps */
                if (phy->speed == 100)
                        mac_control |= BIT(15);
-               else if (phy->speed == 10)
+               /* in band mode only works in 10Mbps RGMII mode */
+               else if ((phy->speed == 10) && phy_interface_is_rgmii(phy))
                        mac_control |= BIT(18); /* In Band mode */
 
                if (priv->rx_pause)